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unsloth/studio/backend/routes/inference.py
Daniel Han 09ca2a1777 Studio: retry agentic loop on validation failure 
Adds a pre-dispatch validation pass inside both agentic tool loops
(generate_chat_completion_with_tools in core/inference/llama_cpp.py and
run_safetensors_tool_loop in core/inference/safetensors_agentic.py).

The pass catches two failure modes between parser and dispatch:

* Unknown tool name (not in the request's tools[] array).
* Arguments that cannot decode to a JSON object when auto_heal is off.

On a caught call the loop appends a corrective tool-result message
tied to the hallucinated tool_call_id (not a fabricated id, so the
OpenAI chat template stays valid) and re-enters the model. When the
call has no usable id we fall back to a user-role correction since
tool-role messages require a matching prior call id.

The retry pass is bounded by max_validation_retries (default 2, new
ChatCompletionRequest field, threaded through the route layer). On
budget exhaustion the call falls through to the existing per-tool
error path so today's behavior is preserved.

When auto_heal_tool_calls is on the heal path still runs in the
dispatch loop unchanged; F3 only catches the strict-shape failures
the coercer cannot fix.
2026-05-22 14:42:19 +00:00

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# SPDX-License-Identifier: AGPL-3.0-only
# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved. See /studio/LICENSE.AGPL-3.0
"""
Inference API routes for model loading and text generation.
"""
import os
import sys
import time
import uuid
from pathlib import Path
from fastapi import APIRouter, Depends, HTTPException, Request, status
from fastapi.responses import StreamingResponse, JSONResponse, Response
from typing import Any, Optional, Union
import json
import httpx
import structlog
from loggers import get_logger
import asyncio
import threading
import re as _re
# Model size extraction (shared with core/inference/llama_cpp.py)
from utils.models import extract_model_size_b as _extract_model_size_b
def _install_httpcore_asyncgen_silencer() -> None:
"""Silence benign httpx/httpcore asyncgen GC noise on Python 3.13.
When Studio proxies a streaming response from llama-server via httpx,
the innermost ``HTTP11ConnectionByteStream.__aiter__`` async generator
is finalised by Python's asyncgen GC hook on a task different from the
one that opened it. Its ``aclose`` path then calls
``anyio.Lock.acquire`` → ``cancel_shielded_checkpoint`` which enters a
``CancelScope`` on the finaliser task — Python 3.13 flags the
cross-task exit as ``"Attempted to exit cancel scope in a different
task"`` and prints ``"async generator ignored GeneratorExit"`` as an
unraisable warning.
This is a known httpx + httpcore + anyio interaction (see MCP SDK
python-sdk#831, agno #3556, chainlit #2361, langchain-mcp-adapters
#254). It is benign: the response has already been delivered with a
200. The streaming pass-throughs (``/v1/chat/completions``,
``/v1/messages``, ``/v1/responses``, ``/v1/completions``) already
manage their httpx lifecycle inside a single task with explicit
``aclose()`` of the lines iterator, response, and client; the errant
generator is not one we hold a reference to and therefore cannot
close ourselves.
We install a single process-wide unraisable hook that swallows just
this specific interaction — identified by the tuple of (RuntimeError
mentioning cancel scope / GeneratorExit) + (object repr referencing
HTTP11ConnectionByteStream) — and defers to the default hook for
everything else. The filter is idempotent.
"""
prior_hook = sys.unraisablehook
if getattr(prior_hook, "_unsloth_httpcore_silencer", False):
return
def _hook(unraisable):
exc_value = getattr(unraisable, "exc_value", None)
obj = getattr(unraisable, "object", None)
obj_repr = repr(obj) if obj is not None else ""
if (
isinstance(exc_value, RuntimeError)
and "HTTP11ConnectionByteStream" in obj_repr
and (
"cancel scope" in str(exc_value)
or "GeneratorExit" in str(exc_value)
or "no running event loop" in str(exc_value)
)
):
return
prior_hook(unraisable)
_hook._unsloth_httpcore_silencer = True # type: ignore[attr-defined]
sys.unraisablehook = _hook
_install_httpcore_asyncgen_silencer()
def _friendly_error(exc: Exception) -> str:
"""Extract a user-friendly message from known llama-server errors."""
# httpx transport-layer failures reaching the managed llama-server —
# raised by the async pass-through helpers that talk to llama-server
# directly. Treat any RequestError subclass (ConnectError, ReadError,
# RemoteProtocolError, WriteError, PoolTimeout, ...) as "the upstream
# subprocess is unreachable", which for Studio always means the
# llama-server subprocess crashed or is still coming up.
if isinstance(exc, httpx.RequestError):
return "Lost connection to the model server. It may have crashed -- try reloading the model."
msg = str(exc)
m = _re.search(
r"request \((\d+) tokens?\) exceeds the available context size \((\d+) tokens?\)",
msg,
)
if m:
return (
f"Message too long: {m.group(1)} tokens exceeds the {m.group(2)}-token "
f"context window. Try increasing the Context Length in Model settings, "
f"or shorten the conversation."
)
if "Lost connection to llama-server" in msg:
return "Lost connection to the model server. It may have crashed -- try reloading the model."
return "An internal error occurred"
# Add backend directory to path
backend_path = Path(__file__).parent.parent.parent
if str(backend_path) not in sys.path:
sys.path.insert(0, str(backend_path))
# Import backend functions
try:
from core.inference import get_inference_backend
from core.inference.llama_cpp import (
LlamaCppBackend,
_DEFAULT_MAX_TOKENS_FLOOR,
_DEFAULT_T_MAX_PREDICT_MS,
_canonicalize_spec_mode,
_hf_offline_if_dns_dead,
detect_reasoning_flags,
)
from core.inference.llama_server_args import (
strip_shadowing_flags,
validate_extra_args,
)
from utils.models import ModelConfig
from utils.inference import load_inference_config
from utils.models.model_config import load_model_defaults
from utils.native_path_leases import (
NativePathLeaseError,
display_label_for_native_path,
is_registered_native_path_label,
redact_native_paths,
verify_native_path_lease,
)
except ImportError:
parent_backend = backend_path.parent / "backend"
if str(parent_backend) not in sys.path:
sys.path.insert(0, str(parent_backend))
from core.inference import get_inference_backend
from core.inference.llama_cpp import (
LlamaCppBackend,
_DEFAULT_MAX_TOKENS_FLOOR,
_DEFAULT_T_MAX_PREDICT_MS,
_canonicalize_spec_mode,
_hf_offline_if_dns_dead,
detect_reasoning_flags,
)
from core.inference.llama_server_args import (
strip_shadowing_flags,
validate_extra_args,
)
from utils.models import ModelConfig
from utils.inference import load_inference_config
from utils.models.model_config import load_model_defaults
from utils.native_path_leases import (
NativePathLeaseError,
display_label_for_native_path,
is_registered_native_path_label,
redact_native_paths,
verify_native_path_lease,
)
from models.inference import (
LoadRequest,
UnloadRequest,
GenerateRequest,
LoadResponse,
LoadProgressResponse,
UnloadResponse,
InferenceStatusResponse,
ChatCompletionRequest,
ChatCompletionChunk,
ChatCompletion,
ChatMessage,
ChunkChoice,
ChoiceDelta,
CompletionChoice,
CompletionMessage,
CompletionUsage,
ValidateModelRequest,
ValidateModelResponse,
TextContentPart,
ImageContentPart,
ImageUrl,
ResponsesRequest,
ResponsesInputMessage,
ResponsesInputTextPart,
ResponsesInputImagePart,
ResponsesOutputTextPart,
ResponsesUnknownContentPart,
ResponsesUnknownInputItem,
ResponsesFunctionCallInputItem,
ResponsesFunctionCallOutputInputItem,
ResponsesOutputTextContent,
ResponsesOutputMessage,
ResponsesOutputFunctionCall,
ResponsesUsage,
ResponsesResponse,
AnthropicMessagesRequest,
AnthropicMessagesResponse,
AnthropicResponseTextBlock,
AnthropicResponseToolUseBlock,
AnthropicUsage,
CreateOpenAIContainerBody,
DeleteOpenAIContainerBody,
ListOpenAIContainersResponse,
OpenAIContainerRequest,
OpenAIContainerSummary,
)
from core.inference.anthropic_compat import (
anthropic_messages_to_openai,
anthropic_tools_to_openai,
anthropic_tool_choice_to_openai,
AnthropicStreamEmitter,
AnthropicPassthroughEmitter,
)
from auth.authentication import get_current_subject
from core.inference.key_exchange import decrypt_api_key
from core.inference.providers import get_provider_info, get_base_url
from core.inference.external_provider import ExternalProviderClient
from storage import providers_db
import io
import wave
import base64
import numpy as np
from datetime import date as _date
router = APIRouter()
# Studio-only router (not mounted on /v1 OpenAI-compat).
studio_router = APIRouter()
def _detect_safetensors_features(backend, chat_template: Optional[str]) -> dict:
"""Classify reasoning/tool capabilities via the GGUF classifier so
flags match across backends. gpt-oss is overridden because Harmony
routes reasoning and tools through tokenizer channels, not template
markup."""
model_id = getattr(backend, "active_model_name", None)
flags = (
detect_reasoning_flags(
chat_template,
model_identifier = model_id,
log_source = "safetensors",
)
if chat_template
else {
"supports_reasoning": False,
"reasoning_style": "enable_thinking",
"reasoning_always_on": False,
"supports_preserve_thinking": False,
"supports_tools": False,
}
)
# Our safetensors loop only parses <tool_call>{json}</tool_call>
# and <function=name>...</function>. Llama uses <|python_tag|>,
# Mistral uses [TOOL_CALLS]; advertising tools for those would
# enable a pill the parser cannot honour. GGUF is unaffected --
# llama-server normalises every format into structured deltas.
if (
flags.get("supports_tools")
and chat_template
and "<tool_call>" not in chat_template
and "<function=" not in chat_template
):
logger.info(
"safetensors: template advertises tools but uses an "
"emission format the loop cannot parse; suppressing "
"supports_tools"
)
flags["supports_tools"] = False
# gpt-oss: keep reasoning on, drop tools (Harmony channel, not
# <tool_call> XML this loop parses).
try:
if hasattr(backend, "_is_gpt_oss_model") and backend._is_gpt_oss_model():
flags["supports_reasoning"] = True
flags["reasoning_style"] = "reasoning_effort"
flags["supports_tools"] = False
except Exception:
logger.debug("gpt_oss_check_failed", exc_info = True)
return flags
def _effective_enable_tools(payload) -> Optional[bool]:
"""Resolve `payload.enable_tools` against the process-level tool policy.
Returns the policy value when set (CLI hard-override from `unsloth run`),
otherwise the per-request value.
"""
from state.tool_policy import get_tool_policy
policy = get_tool_policy()
return policy if policy is not None else payload.enable_tools
# Cancel registry. Proxies (e.g. Colab) can swallow client fetch aborts
# so is_disconnected() never fires. POST /inference/cancel looks up
# in-flight cancel_events here by cancel_id (per-run) or session_id /
# completion_id (fallbacks).
_CANCEL_REGISTRY: dict[str, set[threading.Event]] = {}
_CANCEL_LOCK = threading.Lock()
# Cancel POSTs that arrive before registration are stashed; the next
# matching __enter__ replays set() within the TTL.
_PENDING_CANCELS: dict[str, float] = {}
_PENDING_CANCEL_TTL_S = 30.0
def _prune_pending(now: float) -> None:
for k in [
k for k, ts in _PENDING_CANCELS.items() if now - ts > _PENDING_CANCEL_TTL_S
]:
_PENDING_CANCELS.pop(k, None)
class _TrackedCancel:
"""Register cancel_event in _CANCEL_REGISTRY for the block's duration."""
def __init__(self, event: threading.Event, *keys):
self.event = event
self.keys = tuple(k for k in keys if k)
def __enter__(self):
# Register + consume-pending must be one critical section to close
# the TOCTOU race against a concurrent cancel POST.
should_cancel = False
with _CANCEL_LOCK:
for k in self.keys:
_CANCEL_REGISTRY.setdefault(k, set()).add(self.event)
now = time.monotonic()
_prune_pending(now)
for k in self.keys:
if k and _PENDING_CANCELS.pop(k, None) is not None:
should_cancel = True
if should_cancel:
self.event.set()
return self.event
def __exit__(self, *exc):
with _CANCEL_LOCK:
for k in self.keys:
bucket = _CANCEL_REGISTRY.get(k)
if bucket is None:
continue
bucket.discard(self.event)
if not bucket:
_CANCEL_REGISTRY.pop(k, None)
return False
def _cancel_by_keys(keys) -> int:
"""Set cancel_event for matching registry entries; no stash.
session_id/completion_id are shared across runs on the same thread,
so stashing them would ghost-cancel the user's next request. Only
cancel_id is per-run unique (see _cancel_by_cancel_id_or_stash)."""
if not keys:
return 0
events: set[threading.Event] = set()
with _CANCEL_LOCK:
_prune_pending(time.monotonic())
for k in keys:
bucket = _CANCEL_REGISTRY.get(k)
if bucket:
events.update(bucket)
for ev in events:
ev.set()
return len(events)
def _cancel_by_cancel_id_or_stash(cancel_id: str) -> int:
"""Atomic lookup-or-stash; pairs with _TrackedCancel.__enter__ to
close the TOCTOU race."""
now = time.monotonic()
events: set[threading.Event] = set()
with _CANCEL_LOCK:
_prune_pending(now)
bucket = _CANCEL_REGISTRY.get(cancel_id)
if bucket:
events.update(bucket)
else:
_PENDING_CANCELS[cancel_id] = now
for ev in events:
ev.set()
return len(events)
async def _await_cancel_then_close(cancel_event, resp) -> None:
"""Watch a threading.Event from asyncio and close ``resp`` when it fires.
Used by the passthrough streamers so a /cancel POST can interrupt
while the async iterator is blocked waiting for llama-server prefill.
Without this watcher the in-loop ``cancel_event.is_set()`` check is
unreachable until the first SSE chunk arrives, which is exactly the
proxy/Colab scenario the cancel POST exists to handle.
Polls a threading.Event because the cancel registry is keyed by
threading.Event so the synchronous /cancel handler can call .set().
50ms cadence adds at most that much latency to a prefill cancel; the
common-case streaming cancel path still observes the event in the
iterator's first iteration after the next chunk.
"""
try:
while not cancel_event.is_set():
await asyncio.sleep(0.05)
try:
await resp.aclose()
except Exception:
pass
except asyncio.CancelledError:
return
# Appended to tool-use nudge to discourage plan-without-action
_TOOL_ACTION_NUDGE = (
" IMPORTANT: Always call tools directly -- never write code yourself."
" Never describe what you plan to do -- just call the tool immediately."
" For any code request, call the python tool. For any factual question, call web_search."
" Do NOT output code blocks -- use the python tool instead."
)
# Regex for stripping leaked tool-call XML from assistant messages/stream
_TOOL_XML_RE = _re.compile(
r"<tool_call>.*?</tool_call>|<function=\w+>.*?</function>",
_re.DOTALL,
)
logger = get_logger(__name__)
def _validate_native_mmproj_companion(
mmproj_path: str | None, gguf_path: str | None
) -> None:
if not mmproj_path or not gguf_path:
return
import stat as _stat_module
mm = Path(mmproj_path)
gguf = Path(gguf_path)
try:
mm_lstat = os.lstat(mm)
except OSError as exc:
raise HTTPException(
status_code = 400,
detail = "Native vision companion is no longer accessible.",
) from exc
if _stat_module.S_ISLNK(mm_lstat.st_mode) or not _stat_module.S_ISREG(
mm_lstat.st_mode
):
raise HTTPException(
status_code = 400,
detail = "Native vision companion must be a regular file.",
)
try:
if mm.resolve(strict = True).parent != gguf.resolve(strict = True).parent:
raise HTTPException(
status_code = 400,
detail = "Native vision companion must live next to the selected GGUF.",
)
except OSError as exc:
raise HTTPException(
status_code = 400,
detail = "Native vision companion is no longer accessible.",
) from exc
def _normalise_settings_str(value: Optional[str]) -> Optional[str]:
"""Lowercase + strip a settings string, mapping blank/None to None."""
if value is None:
return None
if isinstance(value, str):
stripped = value.strip().lower()
return stripped or None
return value
def _request_matches_loaded_settings(
request: LoadRequest, llama_backend: LlamaCppBackend
) -> bool:
"""True iff every runtime setting on the request matches the loaded
server. Caller has already checked model+variant+is_loaded. See #5401."""
# Compare requested n_ctx (not effective) so VRAM-cap doesn't mask
# an Auto-vs-explicit slider flip.
if request.max_seq_length != llama_backend.requested_n_ctx:
return False
if _normalise_settings_str(request.cache_type_kv) != _normalise_settings_str(
llama_backend.cache_type_kv
):
return False
# Vision loads silently drop speculative decoding (llama_cpp.py gates
# spec on ``not is_vision``), so treat the request as ``off`` against
# the backend's ``None`` to avoid forcing a redundant reload.
if llama_backend.is_vision:
req_mode = "off"
else:
req_mode = _canonicalize_spec_mode(request.speculative_type) or "auto"
backend_mode = llama_backend.requested_spec_mode or "auto"
if req_mode != backend_mode:
return False
# spec_draft_n_max only matters when an MTP variant is engaged; None
# means "platform default" and matches whatever the backend chose.
if backend_mode in ("mtp", "mtp+ngram") and request.spec_draft_n_max is not None:
if int(request.spec_draft_n_max) != (llama_backend.spec_draft_n_max or 0):
return False
if (request.chat_template_override or None) != (
llama_backend.chat_template_override or None
):
return False
# llama_extra_args=None means "inherit"; only an explicit list that
# differs forces a reload. On the inherit path, refuse to match if
# stored extras contain any shadow flag, so the reload path can
# strip them instead of leaving a stale override in effect.
backend_extra = list(llama_backend.extra_args) if llama_backend.extra_args else []
if request.llama_extra_args is None:
if backend_extra and strip_shadowing_flags(backend_extra) != backend_extra:
return False
else:
if list(request.llama_extra_args) != backend_extra:
return False
return True
def _resolve_model_identifier_for_request(
request: LoadRequest | ValidateModelRequest,
*,
operation: str,
) -> tuple[str, str, bool]:
if not request.native_path_lease:
return request.model_path, request.model_path, False
try:
grant = verify_native_path_lease(
request.native_path_lease,
operation = operation,
expected_kind = "model",
expected_path_type = "file",
allowed_suffixes = (".gguf",),
)
except NativePathLeaseError as exc:
raise HTTPException(status_code = 400, detail = str(exc)) from exc
display_label = (
grant.display_label or Path(request.model_path).name or "Native model"
)
return str(grant.canonical_path), display_label, True
# GGUF inference backend (llama-server)
_llama_cpp_backend = LlamaCppBackend()
def get_llama_cpp_backend() -> LlamaCppBackend:
return _llama_cpp_backend
@router.post("/load", response_model = LoadResponse)
async def load_model(
request: LoadRequest,
fastapi_request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
Load a model for inference.
The model_path should be a clean identifier from GET /models/list.
Returns inference configuration parameters (temperature, top_p, top_k, min_p)
from the model's YAML config, falling back to default.yaml for missing values.
GGUF models are loaded via llama-server (llama.cpp) instead of Unsloth.
"""
native_grant_backed = False
model_log_label = request.model_path
try:
# Validate user-supplied llama-server pass-through args up front
# so a managed-flag collision returns 400 before any model work.
try:
extra_llama_args = validate_extra_args(request.llama_extra_args)
except ValueError as exc:
raise HTTPException(status_code = 400, detail = str(exc))
# Re-narrow []-from-None back to None so the inheritance path
# below can tell "caller omitted" from "caller explicit []".
extra_llama_args: Optional[list[str]] = (
None if request.llama_extra_args is None else extra_llama_args
)
model_identifier, model_log_label, native_grant_backed = (
_resolve_model_identifier_for_request(request, operation = "load-model")
)
# Version switching is handled automatically by the subprocess-based
# inference backend — no need for ensure_transformers_version() here.
# ── Already-loaded check: skip reload if the exact model is active ──
backend = get_inference_backend()
llama_backend = get_llama_cpp_backend()
if request.gguf_variant:
if (
llama_backend.is_loaded
and llama_backend.hf_variant
and llama_backend.hf_variant.lower() == request.gguf_variant.lower()
and llama_backend.model_identifier
and llama_backend.model_identifier.lower() == model_identifier.lower()
# Match runtime settings too so Apply isn't dropped (#5401).
and _request_matches_loaded_settings(request, llama_backend)
# Skip if a prior audio probe failed -- let load_model retry.
and getattr(llama_backend, "_audio_probed", True)
):
logger.info(
f"Model already loaded (GGUF): {model_log_label} variant={request.gguf_variant}, skipping reload"
)
inference_config = load_inference_config(llama_backend.model_identifier)
_gguf_audio = (
llama_backend._audio_type
if hasattr(llama_backend, "_audio_type")
else None
)
_gguf_is_audio = getattr(llama_backend, "_is_audio", False)
return LoadResponse(
status = "already_loaded",
model = model_log_label
if native_grant_backed
else llama_backend.model_identifier,
display_name = model_log_label
if native_grant_backed
else llama_backend.model_identifier,
is_vision = llama_backend._is_vision,
is_lora = False,
is_gguf = True,
is_audio = _gguf_is_audio,
audio_type = _gguf_audio,
has_audio_input = False,
inference = inference_config,
requires_trust_remote_code = bool(
inference_config.get("trust_remote_code", False)
),
context_length = llama_backend.context_length,
max_context_length = llama_backend.max_context_length,
native_context_length = llama_backend.native_context_length,
supports_reasoning = llama_backend.supports_reasoning,
reasoning_style = llama_backend.reasoning_style,
reasoning_always_on = llama_backend.reasoning_always_on,
supports_preserve_thinking = llama_backend.supports_preserve_thinking,
supports_tools = llama_backend.supports_tools,
chat_template = llama_backend.chat_template,
speculative_type = llama_backend.requested_spec_mode,
spec_draft_n_max = llama_backend.spec_draft_n_max,
)
else:
if (
backend.active_model_name
and backend.active_model_name.lower() == model_identifier.lower()
):
logger.info(
f"Model already loaded (Unsloth): {model_log_label}, skipping reload"
)
inference_config = load_inference_config(backend.active_model_name)
_model_info = backend.models.get(backend.active_model_name, {})
_chat_template = None
try:
_tpl_info = _model_info.get("chat_template_info", {})
_chat_template = _tpl_info.get("template")
except Exception as e:
logger.warning(
f"Could not retrieve chat template for {backend.active_model_name}: {e}"
)
# Classify via the same path as GGUF.
_sf_flags = _detect_safetensors_features(backend, _chat_template)
_sf_supports_reasoning = _sf_flags["supports_reasoning"]
_sf_reasoning_style = _sf_flags["reasoning_style"]
return LoadResponse(
status = "already_loaded",
model = model_log_label
if native_grant_backed
else backend.active_model_name,
display_name = model_log_label
if native_grant_backed
else backend.active_model_name,
is_vision = _model_info.get("is_vision", False),
is_lora = _model_info.get("is_lora", False),
is_gguf = False,
is_audio = _model_info.get("is_audio", False),
audio_type = _model_info.get("audio_type"),
has_audio_input = _model_info.get("has_audio_input", False),
inference = inference_config,
requires_trust_remote_code = bool(
inference_config.get("trust_remote_code", False)
),
supports_reasoning = _sf_supports_reasoning,
reasoning_style = _sf_reasoning_style,
reasoning_always_on = _sf_flags["reasoning_always_on"],
supports_preserve_thinking = _sf_flags["supports_preserve_thinking"],
supports_tools = _sf_flags["supports_tools"],
chat_template = _chat_template,
)
# is_lora auto-detected from adapter_config.json on disk/HF.
# DNS-probe wrap so offline loads skip 30-60s of soft-failed
# network checks before the worker starts.
with _hf_offline_if_dns_dead():
config = ModelConfig.from_identifier(
model_id = model_identifier,
hf_token = request.hf_token,
gguf_variant = request.gguf_variant,
)
if not config:
raise HTTPException(
status_code = 400,
detail = f"Invalid model identifier: {model_log_label}",
)
# Normalize gpu_ids: empty list means auto-selection, same as None
effective_gpu_ids = request.gpu_ids if request.gpu_ids else None
# ── GGUF path: load via llama-server ──────────────────────
if config.is_gguf:
if effective_gpu_ids is not None:
raise HTTPException(
status_code = 400,
detail = "gpu_ids is not supported for GGUF models yet.",
)
llama_backend = get_llama_cpp_backend()
unsloth_backend = get_inference_backend()
# Unload any active Unsloth model first to free VRAM
if unsloth_backend.active_model_name:
logger.info(
f"Unloading Unsloth model '{unsloth_backend.active_model_name}' before loading GGUF"
)
unsloth_backend.unload_model(unsloth_backend.active_model_name)
# Inherit llama_extra_args from the previous load when the
# request omits the field (the chat-settings Apply path
# does not round-trip them; explicit [] still clears).
# Inheritance is gated on (model_identifier, hf_variant)
# to refuse cross-model pickup, and shadowing flags are
# stripped so an inherited override can't win the last-wins
# CLI parse against a freshly-supplied first-class field.
if request.llama_extra_args is None and llama_backend.extra_args:
source = llama_backend.extra_args_source
# Compare against the resolved variant, not the request
# field: callers commonly omit gguf_variant for local
# ``.gguf`` paths and HF auto-pick flows. ``config.gguf_
# variant`` is the variant load_model was actually
# invoked with (see the HF / local branches below), so
# both sides of the comparison key off the same string.
resolved_variant = config.gguf_variant
same_source = bool(
source
and source[0]
and source[0].lower() == model_identifier.lower()
and (source[1] or "").lower() == (resolved_variant or "").lower()
)
if not same_source:
logger.info(
"Not inheriting llama_extra_args: stored args came "
"from %s, loading %s",
source,
(model_identifier, resolved_variant),
)
# Cross-model: clear explicitly so the backend
# doesn't inherit via "no opinion" semantics.
extra_llama_args = []
else:
# Strip only the groups whose first-class field
# was actually set by the caller, so an inherited
# --chat-template-file survives an Apply that omits
# chat_template_override.
fields_set = getattr(request, "model_fields_set", set())
stripped = strip_shadowing_flags(
llama_backend.extra_args,
strip_context = "max_seq_length" in fields_set,
strip_cache = "cache_type_kv" in fields_set,
strip_spec = (
"speculative_type" in fields_set
or "spec_draft_n_max" in fields_set
),
strip_template = "chat_template_override" in fields_set,
)
try:
extra_llama_args = validate_extra_args(stripped)
except ValueError:
# Should not happen on already-validated args; degrade
# to no-extras rather than 400 if managed flags changed.
logger.warning(
"Stored llama_extra_args failed revalidation; "
"loading without them: %s",
stripped,
)
extra_llama_args = []
else:
if extra_llama_args:
logger.info(
"Inheriting llama_extra_args from previous "
"load (same model, shadow-stripped): %s",
extra_llama_args,
)
# Route to HF mode or local mode based on config
# Run in a thread so the event loop stays free for progress
# polling and other requests during the (potentially long)
# GGUF download + llama-server startup.
_n_parallel = getattr(fastapi_request.app.state, "llama_parallel_slots", 1)
if config.gguf_hf_repo:
# HF mode: download via huggingface_hub then start llama-server
success = await asyncio.to_thread(
llama_backend.load_model,
hf_repo = config.gguf_hf_repo,
hf_variant = config.gguf_variant,
hf_token = request.hf_token,
model_identifier = config.identifier,
is_vision = config.is_vision,
n_ctx = request.max_seq_length,
chat_template_override = request.chat_template_override,
cache_type_kv = request.cache_type_kv,
speculative_type = request.speculative_type,
spec_draft_n_max = request.spec_draft_n_max,
n_parallel = _n_parallel,
extra_args = extra_llama_args,
)
else:
# Local mode: llama-server loads via -m <path>
if native_grant_backed and config.gguf_mmproj_file:
_validate_native_mmproj_companion(
config.gguf_mmproj_file, config.gguf_file
)
success = await asyncio.to_thread(
llama_backend.load_model,
gguf_path = config.gguf_file,
mmproj_path = config.gguf_mmproj_file,
# Pass the resolved variant so _extra_args_source
# is keyed off the same string the inheritance
# check at the top of /load uses (#5401 followup).
hf_variant = config.gguf_variant,
model_identifier = config.identifier,
is_vision = config.is_vision,
n_ctx = request.max_seq_length,
chat_template_override = request.chat_template_override,
cache_type_kv = request.cache_type_kv,
speculative_type = request.speculative_type,
spec_draft_n_max = request.spec_draft_n_max,
n_parallel = _n_parallel,
extra_args = extra_llama_args,
)
if not success:
raise HTTPException(
status_code = 500,
detail = f"Failed to load GGUF model: {model_log_label if native_grant_backed else config.display_name}",
)
logger.info(
f"Loaded GGUF model via llama-server: {model_log_label if native_grant_backed else config.identifier}"
)
# Audio detection moved into load_model under _serial_load_lock (#5642).
_gguf_audio = llama_backend._audio_type
_gguf_is_audio = llama_backend._is_audio
llama_backend._native_display_label = (
model_log_label if native_grant_backed else None
)
llama_backend._native_grant_backed = bool(native_grant_backed)
if _gguf_is_audio:
logger.info(f"GGUF model detected as audio: audio_type={_gguf_audio}")
inference_config = load_inference_config(config.identifier)
return LoadResponse(
status = "loaded",
model = model_log_label if native_grant_backed else config.identifier,
display_name = model_log_label
if native_grant_backed
else config.display_name,
is_vision = llama_backend.is_vision,
is_lora = False,
is_gguf = True,
is_audio = _gguf_is_audio,
audio_type = _gguf_audio,
has_audio_input = False,
inference = inference_config,
requires_trust_remote_code = bool(
inference_config.get("trust_remote_code", False)
),
context_length = llama_backend.context_length,
max_context_length = llama_backend.max_context_length,
native_context_length = llama_backend.native_context_length,
supports_reasoning = llama_backend.supports_reasoning,
reasoning_style = llama_backend.reasoning_style,
reasoning_always_on = llama_backend.reasoning_always_on,
supports_preserve_thinking = llama_backend.supports_preserve_thinking,
supports_tools = llama_backend.supports_tools,
cache_type_kv = llama_backend.cache_type_kv,
chat_template = llama_backend.chat_template,
speculative_type = llama_backend.requested_spec_mode,
spec_draft_n_max = llama_backend.spec_draft_n_max,
)
# ── Standard path: load via Unsloth/transformers ──────────
backend = get_inference_backend()
# Unload any active GGUF model first
llama_backend = get_llama_cpp_backend()
if llama_backend.is_loaded:
logger.info("Unloading GGUF model before loading Unsloth model")
llama_backend.unload_model()
# Shut down any export subprocess to free VRAM
try:
from core.export import get_export_backend
exp_backend = get_export_backend()
if exp_backend.current_checkpoint:
logger.info(
"Shutting down export subprocess to free GPU memory for inference"
)
exp_backend._shutdown_subprocess()
exp_backend.current_checkpoint = None
exp_backend.is_vision = False
exp_backend.is_peft = False
except Exception as e:
logger.warning("Could not shut down export subprocess: %s", e)
# Auto-detect quantization for LoRA adapters from adapter_config.json
# The training pipeline patches this file with "unsloth_training_method"
# which is 'qlora' or 'lora'. Only LoRA (16-bit) needs load_in_4bit=False.
load_in_4bit = request.load_in_4bit
if config.is_lora and config.path:
import json
from pathlib import Path
adapter_cfg_path = Path(config.path) / "adapter_config.json"
if adapter_cfg_path.exists():
try:
with open(adapter_cfg_path) as f:
adapter_cfg = json.load(f)
training_method = adapter_cfg.get("unsloth_training_method")
if training_method == "lora" and load_in_4bit:
logger.info(
f"adapter_config.json says unsloth_training_method='lora' — "
f"setting load_in_4bit=False to match 16-bit training"
)
load_in_4bit = False
elif training_method == "qlora" and not load_in_4bit:
logger.info(
f"adapter_config.json says unsloth_training_method='qlora' — "
f"setting load_in_4bit=True to match QLoRA training"
)
load_in_4bit = True
elif training_method:
logger.info(
f"Training method: {training_method}, load_in_4bit={load_in_4bit}"
)
else:
# No unsloth_training_method — fallback to base model name
if (
config.base_model
and "-bnb-4bit" not in config.base_model.lower()
and load_in_4bit
):
logger.info(
f"No unsloth_training_method in adapter_config.json. "
f"Base model '{config.base_model}' has no -bnb-4bit suffix — "
f"setting load_in_4bit=False"
)
load_in_4bit = False
except Exception as e:
logger.warning(f"Could not read adapter_config.json: {e}")
# Load the model in a thread so the event loop stays free
# for download progress polling and other requests.
success = await asyncio.to_thread(
backend.load_model,
config = config,
max_seq_length = request.max_seq_length,
load_in_4bit = load_in_4bit,
hf_token = request.hf_token,
trust_remote_code = request.trust_remote_code,
gpu_ids = effective_gpu_ids,
)
if not success:
# Check if YAML says this model needs trust_remote_code
if not request.trust_remote_code:
model_defaults = load_model_defaults(config.identifier)
yaml_trust = model_defaults.get("inference", {}).get(
"trust_remote_code", False
)
if yaml_trust:
raise HTTPException(
status_code = 400,
detail = (
f"Model '{config.display_name}' requires trust_remote_code to be enabled. "
f"Please enable 'Trust remote code' in Chat Settings and try again."
),
)
raise HTTPException(
status_code = 500,
detail = f"Failed to load model: {model_log_label if native_grant_backed else config.display_name}",
)
logger.info(
f"Loaded model: {model_log_label if native_grant_backed else config.identifier}"
)
# Load inference configuration parameters
inference_config = load_inference_config(config.identifier)
# Get chat template from tokenizer
_chat_template = None
try:
_model_info = backend.models.get(config.identifier, {})
_tpl_info = _model_info.get("chat_template_info", {})
_chat_template = _tpl_info.get("template")
except Exception:
pass
# Classify reasoning/tool flags via the GGUF sniffer.
_sf_flags = _detect_safetensors_features(backend, _chat_template)
return LoadResponse(
status = "loaded",
model = model_log_label if native_grant_backed else config.identifier,
display_name = model_log_label
if native_grant_backed
else config.display_name,
is_vision = config.is_vision,
is_lora = config.is_lora,
is_gguf = False,
is_audio = config.is_audio,
audio_type = config.audio_type,
has_audio_input = config.has_audio_input,
inference = inference_config,
requires_trust_remote_code = bool(
inference_config.get("trust_remote_code", False)
),
supports_reasoning = _sf_flags["supports_reasoning"],
reasoning_style = _sf_flags["reasoning_style"],
reasoning_always_on = _sf_flags["reasoning_always_on"],
supports_preserve_thinking = _sf_flags["supports_preserve_thinking"],
supports_tools = _sf_flags["supports_tools"],
chat_template = _chat_template,
)
except HTTPException:
raise
except ValueError as e:
if native_grant_backed:
redacted_msg = redact_native_paths(str(e))
logger.warning(
"Rejected inference selection for native model %s: %s",
model_log_label,
redacted_msg,
)
raise HTTPException(status_code = 400, detail = redacted_msg)
logger.warning("Rejected inference GPU selection: %s", e)
raise HTTPException(status_code = 400, detail = str(e))
except Exception as e:
# Surface a friendlier message for models that Unsloth cannot load
not_supported_hints = [
"No config file found",
"not yet supported",
"is not supported",
"does not support",
]
if native_grant_backed:
redacted_msg = redact_native_paths(str(e))
logger.error(
"Error loading native model %s: %s",
model_log_label,
redacted_msg,
)
msg = redacted_msg
if any(h.lower() in msg.lower() for h in not_supported_hints):
msg = f"This model is not supported yet. Try a different model. (Original error: {msg})"
raise HTTPException(
status_code = 500,
detail = f"Failed to load native model {model_log_label}: {msg}",
)
logger.error(f"Error loading model: {e}", exc_info = True)
msg = str(e)
if any(h.lower() in msg.lower() for h in not_supported_hints):
msg = f"This model is not supported yet. Try a different model. (Original error: {msg})"
raise HTTPException(status_code = 500, detail = f"Failed to load model: {msg}")
@router.post("/validate", response_model = ValidateModelResponse)
async def validate_model(
request: ValidateModelRequest,
current_subject: str = Depends(get_current_subject),
):
"""
Lightweight validation endpoint for model identifiers.
This checks that ModelConfig.from_identifier() can resolve the given
model_path, but it does NOT actually load model weights into GPU memory.
"""
native_grant_backed = False
model_log_label = request.model_path
try:
model_identifier, model_log_label, native_grant_backed = (
_resolve_model_identifier_for_request(request, operation = "validate-model")
)
config = ModelConfig.from_identifier(
model_id = model_identifier,
hf_token = request.hf_token,
gguf_variant = request.gguf_variant,
)
if not config:
raise HTTPException(
status_code = 400,
detail = f"Invalid model identifier: {model_log_label}",
)
return ValidateModelResponse(
valid = True,
message = "Model identifier is valid.",
identifier = model_log_label if native_grant_backed else config.identifier,
display_name = model_log_label
if native_grant_backed
else getattr(config, "display_name", config.identifier),
is_gguf = getattr(config, "is_gguf", False),
is_lora = getattr(config, "is_lora", False),
is_vision = getattr(config, "is_vision", False),
requires_trust_remote_code = bool(
load_inference_config(config.identifier).get("trust_remote_code", False)
),
)
except HTTPException:
raise
except Exception as e:
not_supported_hints = [
"No config file found",
"not yet supported",
"is not supported",
"does not support",
]
if native_grant_backed:
redacted_msg = redact_native_paths(str(e))
logger.error(
"Error validating native model %s: %s",
model_log_label,
redacted_msg,
)
msg = redacted_msg
if any(h.lower() in msg.lower() for h in not_supported_hints):
msg = f"This model is not supported yet. Try a different model. (Original error: {msg})"
raise HTTPException(
status_code = 400,
detail = f"Invalid native model {model_log_label}: {msg}",
)
logger.error(
f"Error validating model identifier '{request.model_path}': {e}",
exc_info = True,
)
raise HTTPException(
status_code = 400,
detail = f"Invalid model: {str(e)}",
)
@router.post("/unload", response_model = UnloadResponse)
async def unload_model(
request: UnloadRequest,
current_subject: str = Depends(get_current_subject),
):
"""
Unload a model from memory.
Routes to the correct backend (llama-server for GGUF, Unsloth otherwise).
"""
try:
# Check if the GGUF backend has this model loaded or is loading it
llama_backend = get_llama_cpp_backend()
if llama_backend.is_active and (
llama_backend.model_identifier == request.model_path
or is_registered_native_path_label(
llama_backend.model_identifier, request.model_path
)
or not llama_backend.is_loaded
):
llama_backend.unload_model()
logger.info(f"Unloaded GGUF model: {request.model_path}")
return UnloadResponse(status = "unloaded", model = request.model_path)
# Otherwise, unload from Unsloth backend
backend = get_inference_backend()
backend.unload_model(request.model_path)
logger.info(f"Unloaded model: {request.model_path}")
return UnloadResponse(status = "unloaded", model = request.model_path)
except Exception as e:
logger.error(f"Error unloading model: {e}", exc_info = True)
raise HTTPException(status_code = 500, detail = f"Failed to unload model: {str(e)}")
@studio_router.post("/cancel")
async def cancel_inference(
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""Cancel in-flight inference requests.
Body (JSON, at least one key required):
cancel_id - preferred: per-run UUID, matched exclusively.
session_id - fallback when cancel_id is absent.
completion_id - fallback when cancel_id is absent.
A cancel_id arriving before its stream registers is stashed briefly
and replayed on registration. Returns {"cancelled": N}.
"""
try:
body = await request.json()
if not isinstance(body, dict):
body = {}
except Exception as e:
logger.debug("Failed to parse cancel request body: %s", e)
body = {}
cancel_id = body.get("cancel_id")
if isinstance(cancel_id, str) and cancel_id:
return {"cancelled": _cancel_by_cancel_id_or_stash(cancel_id)}
keys = []
# `message_id` is the Anthropic passthrough's per-run identifier --
# included so /v1/messages clients can cancel by their native id.
for k in ("completion_id", "session_id", "message_id"):
v = body.get(k)
if isinstance(v, str) and v:
keys.append(v)
if not keys:
return {"cancelled": 0}
n = _cancel_by_keys(keys)
return {"cancelled": n}
@router.post("/generate/stream")
async def generate_stream(
request: GenerateRequest,
current_subject: str = Depends(get_current_subject),
):
"""
Generate a chat response with Server-Sent Events (SSE) streaming.
For vision models, provide image_base64 with the base64-encoded image.
"""
backend = get_inference_backend()
if not backend.active_model_name:
raise HTTPException(
status_code = 400, detail = "No model loaded. Call POST /inference/load first."
)
# Decode image if provided (for vision models)
image = None
if request.image_base64:
try:
import base64
from PIL import Image
from io import BytesIO
# Check if current model supports vision
model_info = backend.models.get(backend.active_model_name, {})
if not model_info.get("is_vision"):
raise HTTPException(
status_code = 400,
detail = "Image provided but current model is text-only. Load a vision model.",
)
image_data = base64.b64decode(request.image_base64)
image = Image.open(BytesIO(image_data))
image = backend.resize_image(image)
except HTTPException:
raise
except Exception as e:
raise HTTPException(
status_code = 400, detail = f"Failed to decode image: {str(e)}"
)
async def stream():
try:
for chunk in backend.generate_chat_response(
messages = request.messages,
system_prompt = request.system_prompt,
image = image,
temperature = request.temperature,
top_p = request.top_p,
top_k = request.top_k,
max_new_tokens = request.max_new_tokens,
repetition_penalty = request.repetition_penalty,
):
yield f"data: {json.dumps({'content': chunk})}\n\n"
yield "data: [DONE]\n\n"
except Exception as e:
backend.reset_generation_state()
logger.error(f"Error during generation: {e}", exc_info = True)
yield f"data: {json.dumps({'error': _friendly_error(e)})}\n\n"
return StreamingResponse(
stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
},
)
@router.get("/status", response_model = InferenceStatusResponse)
async def get_status(
current_subject: str = Depends(get_current_subject),
):
"""
Get current inference backend status.
Reports whichever backend (Unsloth or llama-server) is currently active.
"""
try:
llama_backend = get_llama_cpp_backend()
# MTP probe + freshness check (both cached). Drive the UI banner.
try:
_bin = type(llama_backend)._find_llama_server_binary()
_caps = type(llama_backend).probe_server_capabilities(_bin)
_supports_mtp = bool(_caps.get("supports_mtp", False))
except Exception:
_bin = None
_supports_mtp = True # fail open
try:
from utils.llama_cpp_freshness import check_prebuilt_freshness
_freshness = check_prebuilt_freshness(_bin)
except Exception:
_freshness = {}
_stale = bool(_freshness.get("stale"))
_installed_tag = _freshness.get("installed_tag")
_latest_tag = _freshness.get("latest_tag")
# If a GGUF model is loaded via llama-server, report that
if llama_backend.is_loaded:
_model_id = llama_backend.model_identifier
_native_grant_backed = getattr(llama_backend, "_native_grant_backed", False)
_display_model_id = getattr(
llama_backend, "_native_display_label", None
) or display_label_for_native_path(_model_id)
if (
_native_grant_backed
and _model_id
and _display_model_id == _model_id
and os.path.isabs(_model_id)
):
_display_model_id = os.path.basename(_model_id)
_inference_cfg = load_inference_config(_model_id) if _model_id else None
_audio_type = getattr(llama_backend, "_audio_type", None)
return InferenceStatusResponse(
active_model = _display_model_id,
is_vision = llama_backend.is_vision,
is_gguf = True,
gguf_variant = llama_backend.hf_variant,
is_audio = getattr(llama_backend, "_is_audio", False),
audio_type = _audio_type,
has_audio_input = False,
loading = [],
loaded = [_display_model_id] if _display_model_id else [],
inference = _inference_cfg,
requires_trust_remote_code = bool(
(_inference_cfg or {}).get("trust_remote_code", False)
),
supports_reasoning = llama_backend.supports_reasoning,
reasoning_style = llama_backend.reasoning_style,
reasoning_always_on = llama_backend.reasoning_always_on,
supports_preserve_thinking = llama_backend.supports_preserve_thinking,
supports_tools = llama_backend.supports_tools,
chat_template = llama_backend.chat_template,
context_length = llama_backend.context_length,
max_context_length = llama_backend.max_context_length,
native_context_length = llama_backend.native_context_length,
cache_type_kv = llama_backend.cache_type_kv,
chat_template_override = llama_backend.chat_template_override,
speculative_type = llama_backend.requested_spec_mode,
spec_draft_n_max = llama_backend.spec_draft_n_max,
llama_cpp_supports_mtp = _supports_mtp,
llama_cpp_prebuilt_stale = _stale,
llama_cpp_installed_tag = _installed_tag,
llama_cpp_latest_tag = _latest_tag,
)
# Otherwise, report Unsloth backend status
backend = get_inference_backend()
is_vision = False
is_audio = False
audio_type = None
has_audio_input = False
model_info = {}
if backend.active_model_name:
model_info = backend.models.get(backend.active_model_name, {})
is_vision = model_info.get("is_vision", False)
is_audio = model_info.get("is_audio", False)
audio_type = model_info.get("audio_type")
has_audio_input = model_info.get("has_audio_input", False)
chat_template_info = model_info.get("chat_template_info", {})
chat_template = (
chat_template_info.get("template")
if isinstance(chat_template_info, dict)
else None
)
# Non-GGUF: classify from the loaded template.
_sf_flags = _detect_safetensors_features(backend, chat_template)
inference_config = (
load_inference_config(backend.active_model_name)
if backend.active_model_name
else None
)
return InferenceStatusResponse(
active_model = backend.active_model_name,
is_vision = is_vision,
is_gguf = False,
is_audio = is_audio,
audio_type = audio_type,
has_audio_input = has_audio_input,
loading = list(getattr(backend, "loading_models", set())),
loaded = list(backend.models.keys()),
inference = inference_config,
requires_trust_remote_code = bool(
(inference_config or {}).get("trust_remote_code", False)
),
supports_reasoning = _sf_flags["supports_reasoning"],
reasoning_style = _sf_flags["reasoning_style"],
reasoning_always_on = _sf_flags["reasoning_always_on"],
supports_preserve_thinking = _sf_flags["supports_preserve_thinking"],
supports_tools = _sf_flags["supports_tools"],
chat_template = chat_template,
llama_cpp_supports_mtp = _supports_mtp,
llama_cpp_prebuilt_stale = _stale,
llama_cpp_installed_tag = _installed_tag,
llama_cpp_latest_tag = _latest_tag,
)
except Exception as e:
logger.error(f"Error getting status: {e}", exc_info = True)
raise HTTPException(status_code = 500, detail = f"Failed to get status: {str(e)}")
@router.get("/load-progress", response_model = LoadProgressResponse)
async def get_load_progress(
current_subject: str = Depends(get_current_subject),
):
"""
Return the active GGUF load's mmap/upload progress.
During the warmup window after a GGUF download -- when llama-server
is paging ~tens-to-hundreds of GB of shards into the page cache
before pushing layers to VRAM -- ``/api/inference/status`` only
shows a generic spinner. This endpoint exposes sampled progress so
the UI can render a real bar plus rate/ETA during that window.
Returns an empty payload (``phase=null, bytes=0``) when no load is
in flight. The frontend should stop polling once ``phase`` becomes
``ready``.
"""
try:
llama_backend = get_llama_cpp_backend()
progress = llama_backend.load_progress()
if progress is None:
return LoadProgressResponse()
return LoadProgressResponse(**progress)
except Exception as e:
logger.warning(f"Error sampling load progress: {e}")
return LoadProgressResponse()
# =====================================================================
# Audio (TTS) Generation (/audio/generate)
# =====================================================================
@router.post("/audio/generate")
async def generate_audio(
payload: ChatCompletionRequest,
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
Generate audio (TTS) from the latest user message.
Returns a JSON response with base64-encoded WAV audio.
Works with both GGUF (llama-server) and Unsloth/transformers backends.
"""
import base64
# Extract text from the last user message
_, chat_messages, _ = _extract_content_parts(payload.messages)
if not chat_messages:
raise HTTPException(status_code = 400, detail = "No messages provided.")
last_user_msg = next(
(m for m in reversed(chat_messages) if m["role"] == "user"), None
)
if not last_user_msg:
raise HTTPException(status_code = 400, detail = "No user message found.")
text = last_user_msg["content"]
# Pick backend — both return (wav_bytes, sample_rate)
llama_backend = get_llama_cpp_backend()
if llama_backend.is_loaded and getattr(llama_backend, "_is_audio", False):
model_name = llama_backend.model_identifier
gen = lambda: llama_backend.generate_audio_response(
text = text,
audio_type = llama_backend._audio_type,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_new_tokens = payload.max_tokens or 2048,
repetition_penalty = payload.repetition_penalty,
)
else:
backend = get_inference_backend()
if not backend.active_model_name:
raise HTTPException(status_code = 400, detail = "No model loaded.")
model_info = backend.models.get(backend.active_model_name, {})
if not model_info.get("is_audio"):
raise HTTPException(
status_code = 400, detail = "Active model is not an audio model."
)
model_name = backend.active_model_name
gen = lambda: backend.generate_audio_response(
text = text,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_new_tokens = payload.max_tokens or 2048,
repetition_penalty = payload.repetition_penalty,
use_adapter = payload.use_adapter,
)
try:
wav_bytes, sample_rate = await asyncio.get_event_loop().run_in_executor(
None, gen
)
except Exception as e:
logger.error(f"Audio generation error: {e}", exc_info = True)
raise HTTPException(status_code = 500, detail = str(e))
audio_b64 = base64.b64encode(wav_bytes).decode("ascii")
return JSONResponse(
content = {
"id": f"chatcmpl-{uuid.uuid4().hex[:12]}",
"object": "chat.completion.audio",
"model": model_name,
"audio": {"data": audio_b64, "format": "wav", "sample_rate": sample_rate},
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": f'[Generated audio from: "{text[:100]}"]',
},
"finish_reason": "stop",
}
],
}
)
# =====================================================================
# OpenAI-Compatible Chat Completions (/chat/completions)
# =====================================================================
def _decode_audio_base64(b64: str) -> np.ndarray:
"""Decode base64 audio (any format) → float32 numpy array at 16kHz."""
import torch
import torchaudio
import tempfile
import os
from utils.paths import ensure_dir, tmp_root
raw = base64.b64decode(b64)
# torchaudio.load needs a file path or file-like object with format hint
# Write to a temp file so torchaudio can auto-detect the format
with tempfile.NamedTemporaryFile(
suffix = ".audio",
delete = False,
dir = str(ensure_dir(tmp_root())),
) as tmp:
tmp.write(raw)
tmp_path = tmp.name
try:
waveform, sr = torchaudio.load(tmp_path)
finally:
os.unlink(tmp_path)
# Convert to mono if stereo
if waveform.shape[0] > 1:
waveform = waveform.mean(dim = 0, keepdim = True)
# Resample to 16kHz if needed
if sr != 16000:
resampler = torchaudio.transforms.Resample(orig_freq = sr, new_freq = 16000)
waveform = resampler(waveform)
return waveform.squeeze(0).numpy()
def _extract_content_parts(
messages: list,
) -> tuple[str, list[dict], "Optional[str]"]:
"""
Parse OpenAI-format messages into components the inference backend expects.
Handles both plain-string ``content`` and multimodal content-part arrays
(``[{type: "text", ...}, {type: "image_url", ...}]``).
Returns:
system_prompt: The system message text (empty string if none provided).
chat_messages: Non-system messages with content flattened to strings.
image_base64: Base64 data of the *first* image found, or ``None``.
"""
system_prompt = ""
chat_messages: list[dict] = []
first_image_b64: Optional[str] = None
for msg in messages:
# ── System messages → extract as system_prompt ────────
if msg.role == "system":
if isinstance(msg.content, str):
system_prompt = msg.content
elif isinstance(msg.content, list):
# Unlikely but handle: join text parts
system_prompt = "\n".join(
p.text for p in msg.content if p.type == "text"
)
continue
# ── User / assistant messages ─────────────────────────
if isinstance(msg.content, str):
# Plain string content — pass through
chat_messages.append({"role": msg.role, "content": msg.content})
elif isinstance(msg.content, list):
# Multimodal content parts
text_parts: list[str] = []
for part in msg.content:
if part.type == "text":
text_parts.append(part.text)
elif part.type == "image_url" and first_image_b64 is None:
url = part.image_url.url
if url.startswith("data:"):
# data:image/png;base64,<DATA> → extract <DATA>
first_image_b64 = url.split(",", 1)[1] if "," in url else None
else:
logger.warning(
f"Remote image URLs not yet supported: {url[:80]}..."
)
combined_text = "\n".join(text_parts) if text_parts else ""
chat_messages.append({"role": msg.role, "content": combined_text})
return system_prompt, chat_messages, first_image_b64
# ── External provider proxy ──────────────────────────────────────
# Providers whose stream helper translates `input_document` parts into
# a native attachment block on the wire. For Anthropic the mapping is
# `_stream_anthropic` -> {type:"document", source:...}; for OpenAI it
# is `_stream_openai_responses` -> {type:"input_file", file_data|file_url}.
# Every other provider (gemini / mistral / kimi / openrouter / deepseek /
# custom OpenAI-compat) goes through the generic /chat/completions
# passthrough that forwards messages verbatim, so handing them an
# `input_document` part would 400 with an unknown content_part type.
_INPUT_DOCUMENT_PROVIDERS = frozenset({"anthropic", "openai"})
def _build_external_messages(
messages: list,
supports_vision: bool,
provider_type: Optional[str] = None,
) -> list[dict]:
"""
Convert ChatMessage list to OpenAI-compatible dicts for external providers.
Behaviour per content-part type:
- `text`: always preserved.
- `image_url`: preserved on vision providers; stripped on non-vision.
- `input_document`: preserved ONLY when the provider's stream helper
has explicit translation logic for it (Anthropic + OpenAI today,
see ``_INPUT_DOCUMENT_PROVIDERS``). For every other provider the
part is stripped so the unknown content type doesn't reach generic
/chat/completions passthrough and 400 the request.
- `compaction`: Anthropic-only synthetic part (round-trips server-side
compaction state). Forwarded ONLY when provider_type=="anthropic";
stripped for every other provider so the unknown part doesn't
reach generic /chat/completions passthrough where it would 400
(e.g. DeepSeek, Mistral, Gemini, Kimi, OpenRouter, etc.).
"""
document_provider = provider_type in _INPUT_DOCUMENT_PROVIDERS
anthropic = provider_type == "anthropic"
result = []
for msg in messages:
if isinstance(msg.content, str):
# Skip assistant messages with empty content (some providers reject them)
if msg.role == "assistant" and not msg.content.strip():
continue
result.append({"role": msg.role, "content": msg.content})
elif isinstance(msg.content, list):
if supports_vision:
parts = []
for part in msg.content:
if part.type == "text":
parts.append({"type": "text", "text": part.text})
elif part.type == "image_url":
parts.append(
{
"type": "image_url",
"image_url": {"url": part.image_url.url},
}
)
elif part.type == "input_document" and document_provider:
# ExternalProviderClient maps this onto
# Anthropic's `document` or OpenAI Responses'
# `input_file` block per provider; every other
# provider would 400 on the unknown part type.
doc: dict[str, Any] = {"type": "input_document"}
if part.file_data:
doc["file_data"] = part.file_data
if part.file_url:
doc["file_url"] = part.file_url
if part.filename:
doc["filename"] = part.filename
if part.media_type:
doc["media_type"] = part.media_type
parts.append(doc)
elif part.type == "compaction" and anthropic:
# Anthropic stream helper forwards this as a
# native `compaction` block; every other
# provider would 400 on the unknown part, so
# gate by provider_type.
parts.append({"type": "compaction", "content": part.content})
result.append({"role": msg.role, "content": parts})
else:
# Non-vision provider: strip images / documents, keep
# text, optionally keep compaction (Anthropic only --
# compaction-capable Anthropic models all report
# supports_vision=True today, but the gate is here for
# safety).
preserved = []
for p in msg.content:
if p.type == "text":
preserved.append({"type": "text", "text": p.text})
elif p.type == "compaction" and anthropic:
preserved.append({"type": "compaction", "content": p.content})
if len(preserved) == 1 and preserved[0]["type"] == "text":
# Single text part collapses back to a string for
# providers that don't accept content arrays.
result.append({"role": msg.role, "content": preserved[0]["text"]})
else:
result.append({"role": msg.role, "content": preserved})
return result
async def _proxy_to_external_provider(
payload: ChatCompletionRequest,
request: Request,
) -> StreamingResponse:
"""
Proxy a chat completion request to an external LLM provider.
Resolves provider config (from DB or registry), decrypts the API key,
and streams the response back in OpenAI SSE format.
"""
# Resolve provider type and base URL
provider_type = payload.provider_type
base_url = payload.provider_base_url
if payload.provider_id:
config = providers_db.get_provider(payload.provider_id)
if config is None:
raise HTTPException(
status_code = 404,
detail = f"Provider config not found: {payload.provider_id}",
)
if not config["is_enabled"]:
raise HTTPException(
status_code = 400,
detail = f"Provider '{config['display_name']}' is disabled.",
)
provider_type = provider_type or config["provider_type"]
base_url = base_url or config["base_url"]
if not provider_type:
raise HTTPException(
status_code = 400,
detail = "Either provider_id or provider_type is required for external provider routing.",
)
# Fall back to registry default base URL
if not base_url:
base_url = get_base_url(provider_type)
if not base_url:
raise HTTPException(
status_code = 400,
detail = f"Unknown provider type: {provider_type}",
)
api_key = ""
if payload.encrypted_api_key:
try:
api_key = decrypt_api_key(payload.encrypted_api_key)
except Exception as exc:
logger.warning("external_provider.decrypt_failed", error = str(exc))
raise HTTPException(
status_code = 400,
detail = "Failed to decrypt API key. The server key may have changed — try refreshing the page.",
)
model = payload.external_model or payload.model
if model == "default":
raise HTTPException(
status_code = 400,
detail = "external_model is required when using an external provider.",
)
# Build messages preserving multimodal content for vision-capable providers
from core.inference.providers import get_provider_info as _get_provider_info
_pinfo = _get_provider_info(provider_type) or {}
_supports_vision = _pinfo.get("supports_vision", False)
chat_messages = _build_external_messages(
payload.messages,
_supports_vision,
provider_type = provider_type,
)
client = ExternalProviderClient(
provider_type = provider_type,
base_url = base_url,
api_key = api_key,
)
async def _stream():
gen = client.stream_chat_completion(
messages = chat_messages,
model = model,
temperature = payload.temperature,
top_p = payload.top_p,
max_tokens = payload.max_tokens,
presence_penalty = payload.presence_penalty,
top_k = payload.top_k,
enable_thinking = payload.enable_thinking,
reasoning_effort = payload.reasoning_effort,
enabled_tools = payload.enabled_tools,
enable_prompt_caching = payload.enable_prompt_caching,
openai_code_exec_container_id = payload.openai_code_exec_container_id,
anthropic_code_exec_container_id = payload.anthropic_code_exec_container_id,
prompt_cache_ttl = payload.prompt_cache_ttl,
compaction_threshold = payload.compaction_threshold,
stream = payload.stream,
)
try:
sent_done = False
async for line in gen:
yield f"{line}\n\n"
if "[DONE]" in line:
sent_done = True
if not sent_done:
yield "data: [DONE]\n\n"
except Exception as exc:
logger.error("external_provider.stream_error", error = str(exc))
finally:
try:
await gen.aclose()
except RuntimeError:
pass # suppress httpcore asyncgen cleanup error (Python 3.13 + httpcore 1.0.x)
await client.close()
return StreamingResponse(
_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"X-Accel-Buffering": "no",
},
)
# ── OpenAI shell-tool container management ───────────────────────
def _resolve_openai_cloud_client(
body: OpenAIContainerRequest,
) -> ExternalProviderClient:
"""
Decrypt the API key + validate the base URL points at OpenAI cloud,
then build an ExternalProviderClient for the three container CRUD
endpoints below. The shell tool only exists on api.openai.com, so
rejecting non-cloud bases up front prevents confusing 404s on
ollama / llama.cpp / vLLM / custom presets.
"""
base_url = body.provider_base_url or get_base_url("openai")
if not base_url or "api.openai.com" not in base_url:
raise HTTPException(
status_code = 400,
detail = (
"OpenAI container management is only available on the "
"managed cloud (api.openai.com). The provider's base URL "
f"points at {base_url!r}."
),
)
try:
api_key = decrypt_api_key(body.encrypted_api_key)
except Exception as exc:
logger.warning("external_provider.decrypt_failed", error = str(exc))
raise HTTPException(
status_code = 400,
detail = "Failed to decrypt API key. The server key may have changed — try refreshing the page.",
)
return ExternalProviderClient(
provider_type = "openai",
base_url = base_url,
api_key = api_key,
)
def _summarize_container(raw: dict) -> OpenAIContainerSummary:
expires = raw.get("expires_after")
expires_minutes: Optional[int] = None
if isinstance(expires, dict):
minutes = expires.get("minutes")
if isinstance(minutes, int):
expires_minutes = minutes
return OpenAIContainerSummary(
id = str(raw.get("id") or ""),
name = raw.get("name"),
created_at = raw.get("created_at")
if isinstance(raw.get("created_at"), int)
else None,
last_active_at = raw.get("last_active_at")
if isinstance(raw.get("last_active_at"), int)
else None,
expires_after_minutes = expires_minutes,
status = raw.get("status") if isinstance(raw.get("status"), str) else None,
)
@router.post(
"/external/openai/containers/list",
response_model = ListOpenAIContainersResponse,
)
async def list_openai_containers(
body: OpenAIContainerRequest,
current_subject: str = Depends(get_current_subject),
) -> ListOpenAIContainersResponse:
"""List the user's OpenAI shell-tool containers."""
client = _resolve_openai_cloud_client(body)
try:
try:
raw = await client.list_openai_containers()
except httpx.HTTPStatusError as exc:
detail = exc.response.text[:500] if exc.response is not None else str(exc)
raise HTTPException(
status_code = exc.response.status_code if exc.response else 502,
detail = f"OpenAI rejected /containers list: {detail}",
)
except httpx.HTTPError as exc:
raise HTTPException(
status_code = 502,
detail = f"Failed to reach OpenAI: {exc}",
)
# OpenAI keeps expired containers in /v1/containers indefinitely
# with status="expired" — they're effectively dead but still
# listed. Hide them so the picker only shows usable containers.
return ListOpenAIContainersResponse(
containers = [
_summarize_container(c)
for c in raw
if isinstance(c, dict) and c.get("status") != "expired"
],
)
finally:
await client.close()
@router.post(
"/external/openai/containers/create",
response_model = OpenAIContainerSummary,
)
async def create_openai_container(
body: CreateOpenAIContainerBody,
current_subject: str = Depends(get_current_subject),
) -> OpenAIContainerSummary:
"""Create a named container with the user-chosen idle TTL."""
client = _resolve_openai_cloud_client(body)
try:
try:
raw = await client.create_openai_container(
name = body.name,
ttl_minutes = body.ttl_minutes,
)
except httpx.HTTPStatusError as exc:
detail = exc.response.text[:500] if exc.response is not None else str(exc)
raise HTTPException(
status_code = exc.response.status_code if exc.response else 502,
detail = f"OpenAI rejected /containers create: {detail}",
)
except httpx.HTTPError as exc:
raise HTTPException(
status_code = 502,
detail = f"Failed to reach OpenAI: {exc}",
)
if not isinstance(raw, dict):
raise HTTPException(
status_code = 502,
detail = "OpenAI returned an unexpected container payload.",
)
return _summarize_container(raw)
finally:
await client.close()
@router.post("/external/openai/containers/delete", status_code = 204)
async def delete_openai_container(
body: DeleteOpenAIContainerBody,
current_subject: str = Depends(get_current_subject),
) -> None:
"""Delete a named container by id."""
logger.info(
"openai_container_delete.request subject=%s container_id=%s base_url=%s",
current_subject,
body.container_id,
body.provider_base_url,
)
client = _resolve_openai_cloud_client(body)
try:
try:
await client.delete_openai_container(body.container_id)
logger.info(
"openai_container_delete.success container_id=%s",
body.container_id,
)
except httpx.HTTPStatusError as exc:
detail = exc.response.text[:500] if exc.response is not None else str(exc)
logger.warning(
"openai_container_delete.openai_rejected container_id=%s status=%s body=%s",
body.container_id,
exc.response.status_code if exc.response else None,
detail,
)
raise HTTPException(
status_code = exc.response.status_code if exc.response else 502,
detail = f"OpenAI rejected /containers delete: {detail}",
)
except httpx.HTTPError as exc:
logger.warning(
"openai_container_delete.transport_error container_id=%s error=%s",
body.container_id,
exc,
)
raise HTTPException(
status_code = 502,
detail = f"Failed to reach OpenAI: {exc}",
)
finally:
await client.close()
@router.post("/chat/completions")
async def openai_chat_completions(
payload: ChatCompletionRequest,
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
OpenAI-compatible chat completions endpoint.
Supports multimodal messages: ``content`` may be a plain string or a
list of content parts (``text`` / ``image_url``).
Non-streaming (default): returns a single ChatCompletion JSON object.
Streaming: returns SSE chunks matching OpenAI's format.
``stream`` defaults to ``false`` to match OpenAI's spec; clients opt
into SSE by sending ``stream: true``.
Automatically routes to the correct backend:
- GGUF models → llama-server via LlamaCppBackend
- Other models → Unsloth/transformers via InferenceBackend
"""
# ── External provider routing ────────────────────────────────
# encrypted_api_key is optional — local providers (llama.cpp / vLLM / Ollama) may run without auth.
if payload.provider_id or payload.provider_type:
return await _proxy_to_external_provider(payload, request)
llama_backend = get_llama_cpp_backend()
using_gguf = llama_backend.is_loaded
# OpenAI-SDK clients send ``chat_template_kwargs`` via ``extra_body``,
# which the SDK spreads into the request body at the top level. Studio's
# ChatCompletionRequest has ``extra="allow"`` so pydantic stashes them in
# ``model_extra``, but the typed ``payload.enable_thinking`` path is what
# downstream generators actually consume. Lift ``enable_thinking`` from
# the extra-body chat_template_kwargs onto the typed field so clients
# that only know the OpenAI shape (data_designer recipe runs, etc.)
# can still control the reasoning preamble.
_extra = getattr(payload, "model_extra", None)
if payload.enable_thinking is None and isinstance(_extra, dict):
_tpl_kw = _extra.get("chat_template_kwargs")
if isinstance(_tpl_kw, dict) and "enable_thinking" in _tpl_kw:
payload.enable_thinking = bool(_tpl_kw["enable_thinking"])
# ── Determine which backend is active ─────────────────────
if using_gguf:
model_name = llama_backend.model_identifier or payload.model
if getattr(llama_backend, "_is_audio", False):
return await generate_audio(payload, request)
else:
backend = get_inference_backend()
if not backend.active_model_name:
raise HTTPException(
status_code = 400,
detail = "No model loaded. Call POST /inference/load first.",
)
model_name = backend.active_model_name or payload.model
# ── Audio TTS path: auto-route to audio generation ────
# (Whisper is ASR not TTS — handled below in audio input path)
model_info = backend.models.get(backend.active_model_name, {})
if model_info.get("is_audio") and model_info.get("audio_type") != "whisper":
return await generate_audio(payload, request)
# ── Whisper without audio: return clear error ──
if model_info.get("audio_type") == "whisper" and not payload.audio_base64:
raise HTTPException(
status_code = 400,
detail = "Whisper models require audio input. Please upload an audio file.",
)
# ── Audio INPUT path: decode WAV and route to audio input generation ──
if payload.audio_base64 and model_info.get("has_audio_input"):
audio_array = _decode_audio_base64(payload.audio_base64)
system_prompt, chat_messages, _ = _extract_content_parts(payload.messages)
cancel_event = threading.Event()
completion_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"
created = int(time.time())
def audio_input_generate():
if model_info.get("audio_type") == "whisper":
return backend.generate_whisper_response(
audio_array = audio_array,
cancel_event = cancel_event,
)
return backend.generate_audio_input_response(
messages = chat_messages,
system_prompt = system_prompt,
audio_array = audio_array,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_new_tokens = payload.max_tokens or 2048,
repetition_penalty = payload.repetition_penalty,
cancel_event = cancel_event,
)
if payload.stream:
_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_tracker = _TrackedCancel(cancel_event, *_cancel_keys)
_tracker.__enter__()
async def audio_input_stream():
try:
first_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(role = "assistant"),
finish_reason = None,
)
],
)
yield f"data: {first_chunk.model_dump_json(exclude_none = True)}\n\n"
gen = audio_input_generate()
_DONE = object()
while True:
if cancel_event.is_set():
break
if await request.is_disconnected():
cancel_event.set()
return
chunk_text = await asyncio.to_thread(next, gen, _DONE)
if chunk_text is _DONE:
break
if chunk_text:
chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(content = chunk_text),
finish_reason = None,
)
],
)
yield f"data: {chunk.model_dump_json(exclude_none = True)}\n\n"
final_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(delta = ChoiceDelta(), finish_reason = "stop")
],
)
yield f"data: {final_chunk.model_dump_json(exclude_none = True)}\n\n"
yield "data: [DONE]\n\n"
except asyncio.CancelledError:
cancel_event.set()
raise
except Exception as e:
logger.error(
f"Error during audio input streaming: {e}", exc_info = True
)
yield f"data: {json.dumps({'error': {'message': _friendly_error(e), 'type': 'server_error'}})}\n\n"
finally:
_tracker.__exit__(None, None, None)
return StreamingResponse(
audio_input_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
else:
full_text = "".join(audio_input_generate())
response = ChatCompletion(
id = completion_id,
created = created,
model = model_name,
choices = [
CompletionChoice(
message = CompletionMessage(content = full_text),
finish_reason = "stop",
)
],
)
return JSONResponse(content = response.model_dump())
# ── Standard OpenAI function-calling pass-through (GGUF only) ────
# When a client (opencode / Claude Code via OpenAI compat / Cursor /
# Continue / ...) sends standard OpenAI `tools` without Studio's
# `enable_tools` shorthand, forward the request to llama-server
# verbatim so structured `tool_calls` flow back to the client. This
# branch runs BEFORE `_extract_content_parts` because that helper is
# unaware of `role="tool"` messages and assistant messages that only
# carry `tool_calls` (content=None) — both of which are valid in
# multi-turn client-side tool loops.
_has_tool_messages = any(m.role == "tool" or m.tool_calls for m in payload.messages)
# Route guided-decoding requests through the verbatim passthrough so
# ``response_format`` (JSON schema) actually reaches llama-server and
# the model's GBNF-constrained output comes back unmodified. The
# non-passthrough GGUF path below calls ``generate_chat_completion``
# which has no response_format kwarg, so the schema gets silently
# dropped and data_designer falls back to free-form sampling. Guided
# decoding does not require ``supports_tools`` - the grammar machinery
# is independent of tool-call parsing.
_has_response_format = _extract_response_format(payload) is not None
_tools_passthrough = llama_backend.supports_tools and (
(payload.tools and len(payload.tools) > 0) or _has_tool_messages
)
if (
using_gguf
and not _effective_enable_tools(payload)
and (_tools_passthrough or _has_response_format)
):
if payload.audio_base64:
raise HTTPException(
status_code = 400,
detail = "Audio input is not supported for GGUF chat models yet.",
)
# Preserve the vision guard that would otherwise run in the
# non-passthrough path below: text-only tool-capable GGUFs
# should return a clear 400 here rather than forwarding the
# image to llama-server and surfacing an opaque upstream error.
if not llama_backend.is_vision and (
payload.image_base64
or any(
isinstance(m.content, list)
and any(isinstance(p, ImageContentPart) for p in m.content)
for m in payload.messages
)
):
raise HTTPException(
status_code = 400,
detail = "Image provided but current GGUF model does not support vision.",
)
cancel_event = threading.Event()
completion_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"
# `stream` defaults to False on ChatCompletionRequest (OpenAI spec
# parity). Naive curl / .NET / System.Text.Json clients omitting
# the field used to get SSE here and choke on deserialization (#5047).
if payload.stream:
return await _openai_passthrough_stream(
request,
cancel_event,
llama_backend,
payload,
model_name,
completion_id,
)
return await _openai_passthrough_non_streaming(
llama_backend,
payload,
model_name,
)
# ── Parse messages (handles multimodal content parts) ─────
system_prompt, chat_messages, extracted_image_b64 = _extract_content_parts(
payload.messages
)
if not chat_messages:
raise HTTPException(
status_code = 400,
detail = "At least one non-system message is required.",
)
# ── GGUF path: proxy to llama-server /v1/chat/completions ──
if using_gguf:
if payload.audio_base64:
raise HTTPException(
status_code = 400,
detail = "Audio input is not supported for GGUF chat models yet.",
)
gguf_messages, has_gguf_image = _openai_messages_for_gguf_chat(
payload,
llama_backend.is_vision,
)
image_b64 = None
cancel_event = threading.Event()
completion_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"
created = int(time.time())
# ── Tool-calling path (agentic loop) ──────────────────
# `_effective_enable_tools` lets `unsloth run --enable-tools/--disable-tools`
# hard-override the per-request value. Without a CLI override, falls
# back to `payload.enable_tools` (existing behavior).
use_tools = (
_effective_enable_tools(payload)
and llama_backend.supports_tools
and not has_gguf_image
)
if use_tools:
from core.inference.tools import ALL_TOOLS
if payload.enabled_tools is not None:
tools_to_use = [
t
for t in ALL_TOOLS
if t["function"]["name"] in payload.enabled_tools
]
else:
tools_to_use = ALL_TOOLS
# ── Tool-use system prompt nudge ──────────────────────
_tool_names = {t["function"]["name"] for t in tools_to_use}
_has_web = "web_search" in _tool_names
_has_code = "python" in _tool_names or "terminal" in _tool_names
_date_line = f"The current date is {_date.today().isoformat()}."
# Small models (<9B) struggle with multi-step search plans,
# so simplify the web tips to avoid plan-then-stall behavior.
_model_size_b = _extract_model_size_b(model_name)
_is_small_model = _model_size_b is not None and _model_size_b < 9
if _is_small_model:
_web_tips = "Do not repeat the same search query."
else:
_web_tips = (
"When you search and find a relevant URL in the results, "
"fetch its full content by calling web_search with the url parameter. "
"Do not repeat the same search query. If a search returns "
"no useful results, try rephrasing or fetching a result URL directly."
)
_code_tips = (
"Use code execution for math, calculations, data processing, "
"or to parse and analyze information from tool results."
)
if _has_web and _has_code:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"tools rather than answering from memory. "
+ _web_tips
+ " "
+ _code_tips
)
elif _has_code:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"code execution rather than answering from memory. " + _code_tips
)
elif _has_web:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"web search for up-to-date or uncertain factual "
"information rather than answering from memory. " + _web_tips
)
else:
_nudge = ""
if _nudge:
_nudge += _TOOL_ACTION_NUDGE
# Append nudge to system prompt (preserve user's prompt)
if system_prompt:
system_prompt = system_prompt.rstrip() + "\n\n" + _nudge
else:
system_prompt = _nudge
# Rebuild gguf_messages with updated system prompt
gguf_messages = []
if system_prompt:
gguf_messages.append({"role": "system", "content": system_prompt})
gguf_messages.extend(chat_messages)
# ── Strip stale tool-call XML from conversation history ─
for _msg in gguf_messages:
if _msg.get("role") == "assistant" and isinstance(
_msg.get("content"), str
):
_msg["content"] = _TOOL_XML_RE.sub("", _msg["content"]).strip()
def gguf_generate_with_tools():
return llama_backend.generate_chat_completion_with_tools(
messages = gguf_messages,
tools = tools_to_use,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_tokens = payload.max_tokens,
repetition_penalty = payload.repetition_penalty,
presence_penalty = payload.presence_penalty,
cancel_event = cancel_event,
enable_thinking = payload.enable_thinking,
reasoning_effort = payload.reasoning_effort,
preserve_thinking = payload.preserve_thinking,
auto_heal_tool_calls = payload.auto_heal_tool_calls
if payload.auto_heal_tool_calls is not None
else True,
max_tool_iterations = payload.max_tool_calls_per_message
if payload.max_tool_calls_per_message is not None
else 25,
tool_call_timeout = payload.tool_call_timeout
if payload.tool_call_timeout is not None
else 300,
session_id = payload.session_id,
max_validation_retries = (
payload.max_validation_retries
if payload.max_validation_retries is not None
else 2
),
)
_tool_sentinel = object()
_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_tracker = _TrackedCancel(cancel_event, *_cancel_keys)
_tracker.__enter__()
async def gguf_tool_stream():
try:
first_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(role = "assistant"),
finish_reason = None,
)
],
)
yield f"data: {first_chunk.model_dump_json(exclude_none = True)}\n\n"
# Iterate the synchronous generator in a thread so
# the event loop stays free for disconnect detection.
gen = gguf_generate_with_tools()
prev_text = ""
_stream_usage = None
_stream_timings = None
while True:
if cancel_event.is_set():
break
if await request.is_disconnected():
cancel_event.set()
return
event = await asyncio.to_thread(next, gen, _tool_sentinel)
if event is _tool_sentinel:
break
if event["type"] == "status":
# Empty status marks an iteration boundary
# in the GGUF tool loop (e.g. after a
# re-prompt). Reset the cumulative cursor
# so the next assistant turn streams cleanly.
if not event["text"]:
prev_text = ""
# Emit tool status as a custom SSE event
# (including empty ones to clear UI badges)
status_data = json.dumps(
{
"type": "tool_status",
"content": event["text"],
}
)
yield f"data: {status_data}\n\n"
continue
if event["type"] in ("tool_start", "tool_end"):
if event["type"] == "tool_start":
prev_text = ""
yield f"data: {json.dumps(event)}\n\n"
continue
if event["type"] == "metadata":
_stream_usage = event.get("usage")
_stream_timings = event.get("timings")
continue
# "content" type -- cumulative text
# Sanitize the full cumulative then diff against
# the last sanitized snapshot so cross-chunk XML
# tags are handled correctly.
raw_cumulative = event.get("text", "")
clean_cumulative = _TOOL_XML_RE.sub("", raw_cumulative)
new_text = clean_cumulative[len(prev_text) :]
prev_text = clean_cumulative
if not new_text:
continue
chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(content = new_text),
finish_reason = None,
)
],
)
yield f"data: {chunk.model_dump_json(exclude_none = True)}\n\n"
final_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(),
finish_reason = "stop",
)
],
)
yield f"data: {final_chunk.model_dump_json(exclude_none = True)}\n\n"
# Usage chunk (OpenAI-standard: choices=[], usage populated)
if _stream_usage or _stream_timings:
usage_obj = CompletionUsage(
prompt_tokens = (_stream_usage or {}).get("prompt_tokens", 0),
completion_tokens = (_stream_usage or {}).get(
"completion_tokens", 0
),
total_tokens = (_stream_usage or {}).get("total_tokens", 0),
)
usage_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [],
usage = usage_obj,
timings = _stream_timings,
)
yield f"data: {usage_chunk.model_dump_json(exclude_none = True)}\n\n"
yield "data: [DONE]\n\n"
except asyncio.CancelledError:
cancel_event.set()
raise
except Exception as e:
import traceback
tb = traceback.format_exc()
logger.error(f"Error during GGUF tool streaming: {e}\n{tb}")
error_chunk = {
"error": {
"message": _friendly_error(e),
"type": "server_error",
},
}
yield f"data: {json.dumps(error_chunk)}\n\n"
finally:
_tracker.__exit__(None, None, None)
return StreamingResponse(
gguf_tool_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
# ── Standard GGUF path (no tools) ─────────────────────
def gguf_generate():
return llama_backend.generate_chat_completion(
messages = gguf_messages,
image_b64 = image_b64,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_tokens = payload.max_tokens,
repetition_penalty = payload.repetition_penalty,
presence_penalty = payload.presence_penalty,
cancel_event = cancel_event,
enable_thinking = payload.enable_thinking,
reasoning_effort = payload.reasoning_effort,
preserve_thinking = payload.preserve_thinking,
)
_gguf_sentinel = object()
if payload.stream:
_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_tracker = _TrackedCancel(cancel_event, *_cancel_keys)
_tracker.__enter__()
async def gguf_stream_chunks():
try:
# First chunk: role
first_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(role = "assistant"),
finish_reason = None,
)
],
)
yield f"data: {first_chunk.model_dump_json(exclude_none = True)}\n\n"
# Iterate the synchronous generator in a thread so
# the event loop stays free for disconnect detection.
gen = gguf_generate()
prev_text = ""
_stream_usage = None
_stream_timings = None
while True:
if cancel_event.is_set():
break
if await request.is_disconnected():
cancel_event.set()
return
cumulative = await asyncio.to_thread(next, gen, _gguf_sentinel)
if cumulative is _gguf_sentinel:
break
# Capture server metadata for final usage chunk
if isinstance(cumulative, dict):
if cumulative.get("type") == "metadata":
_stream_usage = cumulative.get("usage")
_stream_timings = cumulative.get("timings")
else:
logger.warning(
"gguf_stream_chunks: unexpected dict event: %s",
{
k: v
for k, v in cumulative.items()
if k != "timings"
},
)
continue
new_text = cumulative[len(prev_text) :]
prev_text = cumulative
if not new_text:
continue
chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(content = new_text),
finish_reason = None,
)
],
)
yield f"data: {chunk.model_dump_json(exclude_none = True)}\n\n"
# Final chunk
final_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(),
finish_reason = "stop",
)
],
)
yield f"data: {final_chunk.model_dump_json(exclude_none = True)}\n\n"
# Usage chunk (OpenAI-standard: choices=[], usage populated)
if _stream_usage or _stream_timings:
usage_obj = CompletionUsage(
prompt_tokens = (_stream_usage or {}).get("prompt_tokens", 0),
completion_tokens = (_stream_usage or {}).get(
"completion_tokens", 0
),
total_tokens = (_stream_usage or {}).get("total_tokens", 0),
)
usage_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [],
usage = usage_obj,
timings = _stream_timings,
)
yield f"data: {usage_chunk.model_dump_json(exclude_none = True)}\n\n"
yield "data: [DONE]\n\n"
except asyncio.CancelledError:
cancel_event.set()
raise
except Exception as e:
logger.error(f"Error during GGUF streaming: {e}", exc_info = True)
error_chunk = {
"error": {
"message": _friendly_error(e),
"type": "server_error",
},
}
yield f"data: {json.dumps(error_chunk)}\n\n"
finally:
_tracker.__exit__(None, None, None)
return StreamingResponse(
gguf_stream_chunks(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
else:
try:
full_text = ""
for token in gguf_generate():
if isinstance(token, dict):
continue # skip metadata dict in non-streaming path
full_text = token
response = ChatCompletion(
id = completion_id,
created = created,
model = model_name,
choices = [
CompletionChoice(
message = CompletionMessage(content = full_text),
finish_reason = "stop",
)
],
)
return JSONResponse(content = response.model_dump())
except Exception as e:
logger.error(f"Error during GGUF completion: {e}", exc_info = True)
raise HTTPException(status_code = 500, detail = str(e))
# ── Standard Unsloth path ─────────────────────────────────
# Decode image (from content parts OR legacy field)
image_b64 = extracted_image_b64 or payload.image_base64
image = None
if image_b64:
try:
import base64
from PIL import Image
from io import BytesIO
model_info = backend.models.get(backend.active_model_name, {})
if not model_info.get("is_vision"):
raise HTTPException(
status_code = 400,
detail = "Image provided but current model is text-only. Load a vision model.",
)
image_data = base64.b64decode(image_b64)
image = Image.open(BytesIO(image_data))
image = backend.resize_image(image)
except HTTPException:
raise
except Exception as e:
raise HTTPException(status_code = 400, detail = f"Failed to decode image: {e}")
# Classify capability flags from the loaded template.
_sf_model_info = backend.models.get(backend.active_model_name, {})
_sf_tpl = (_sf_model_info.get("chat_template_info") or {}).get("template")
_sf_features = _detect_safetensors_features(backend, _sf_tpl)
cancel_event = threading.Event()
completion_id = f"chatcmpl-{uuid.uuid4().hex[:12]}"
created = int(time.time())
# ── Safetensors tool-calling path ─────────────────────────
# Mirrors the GGUF agentic loop's event shape. Disabled for
# vision turns (untested overlap with image render slot) and
# for gpt-oss (Harmony uses dedicated channels, not <tool_call>
# XML -- gpt-oss tools still work via the GGUF path).
_sf_is_gptoss = False
try:
_sf_is_gptoss = bool(
hasattr(backend, "_is_gpt_oss_model") and backend._is_gpt_oss_model()
)
except Exception:
_sf_is_gptoss = False
_sf_tool_budget = (
payload.max_tool_calls_per_message
if payload.max_tool_calls_per_message is not None
else 25
)
_sf_use_tools = (
_effective_enable_tools(payload)
and _sf_features.get("supports_tools", False)
and image is None
and not _sf_is_gptoss
and _sf_tool_budget > 0
)
if _sf_use_tools:
from core.inference.tools import ALL_TOOLS
if payload.enabled_tools is not None:
_sf_tools_to_use = [
t for t in ALL_TOOLS if t["function"]["name"] in payload.enabled_tools
]
else:
_sf_tools_to_use = ALL_TOOLS
_sf_tool_names = {t["function"]["name"] for t in _sf_tools_to_use}
_sf_has_web = "web_search" in _sf_tool_names
_sf_has_code = "python" in _sf_tool_names or "terminal" in _sf_tool_names
_sf_date_line = f"The current date is {_date.today().isoformat()}."
_sf_model_size_b = _extract_model_size_b(model_name)
_sf_is_small_model = _sf_model_size_b is not None and _sf_model_size_b < 9
if _sf_is_small_model:
_sf_web_tips = "Do not repeat the same search query."
else:
_sf_web_tips = (
"When you search and find a relevant URL in the results, "
"fetch its full content by calling web_search with the url parameter. "
"Do not repeat the same search query. If a search returns "
"no useful results, try rephrasing or fetching a result URL directly."
)
_sf_code_tips = (
"Use code execution for math, calculations, data processing, "
"or to parse and analyze information from tool results."
)
if _sf_has_web and _sf_has_code:
_sf_nudge = (
_sf_date_line + " "
"You have access to tools. When appropriate, prefer using "
"tools rather than answering from memory. "
+ _sf_web_tips
+ " "
+ _sf_code_tips
)
elif _sf_has_code:
_sf_nudge = (
_sf_date_line + " "
"You have access to tools. When appropriate, prefer using "
"code execution rather than answering from memory. " + _sf_code_tips
)
elif _sf_has_web:
_sf_nudge = (
_sf_date_line + " "
"You have access to tools. When appropriate, prefer using "
"web search for up-to-date or uncertain factual "
"information rather than answering from memory. " + _sf_web_tips
)
else:
_sf_nudge = ""
_sf_system_prompt = system_prompt
if _sf_nudge:
_sf_nudge += _TOOL_ACTION_NUDGE
if _sf_system_prompt:
_sf_system_prompt = _sf_system_prompt.rstrip() + "\n\n" + _sf_nudge
else:
_sf_system_prompt = _sf_nudge
# Strip stale tool-call XML from prior assistant turns.
_sf_chat_messages = []
for _msg in chat_messages:
if _msg.get("role") == "assistant" and isinstance(_msg.get("content"), str):
_sf_chat_messages.append(
{
**_msg,
"content": _TOOL_XML_RE.sub("", _msg["content"]).strip(),
}
)
else:
_sf_chat_messages.append(_msg)
def sf_generate_with_tools():
return backend.generate_chat_completion_with_tools(
messages = _sf_chat_messages,
tools = _sf_tools_to_use,
system_prompt = _sf_system_prompt or "",
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_tokens = payload.max_tokens,
repetition_penalty = payload.repetition_penalty,
cancel_event = cancel_event,
enable_thinking = payload.enable_thinking,
reasoning_effort = payload.reasoning_effort,
preserve_thinking = payload.preserve_thinking,
auto_heal_tool_calls = payload.auto_heal_tool_calls
if payload.auto_heal_tool_calls is not None
else True,
max_tool_iterations = _sf_tool_budget,
tool_call_timeout = payload.tool_call_timeout
if payload.tool_call_timeout is not None
else 300,
session_id = payload.session_id,
use_adapter = payload.use_adapter,
max_validation_retries = (
payload.max_validation_retries
if payload.max_validation_retries is not None
else 2
),
)
_sf_tool_sentinel = object()
_sf_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_sf_tracker = _TrackedCancel(cancel_event, *_sf_cancel_keys)
_sf_tracker.__enter__()
async def sf_tool_stream():
try:
first_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(role = "assistant"),
finish_reason = None,
)
],
)
yield f"data: {first_chunk.model_dump_json(exclude_none = True)}\n\n"
gen = sf_generate_with_tools()
prev_text = ""
while True:
if cancel_event.is_set():
backend.reset_generation_state()
break
if await request.is_disconnected():
cancel_event.set()
backend.reset_generation_state()
return
event = await asyncio.to_thread(next, gen, _sf_tool_sentinel)
if event is _sf_tool_sentinel:
break
if event["type"] == "status":
if not event["text"]:
prev_text = ""
status_data = json.dumps(
{
"type": "tool_status",
"content": event["text"],
}
)
yield f"data: {status_data}\n\n"
continue
if event["type"] in ("tool_start", "tool_end"):
if event["type"] == "tool_start":
prev_text = ""
yield f"data: {json.dumps(event)}\n\n"
continue
# Diff cumulative cleaned text against last snapshot.
raw_cumulative = event.get("text", "")
clean_cumulative = _TOOL_XML_RE.sub("", raw_cumulative)
new_text = clean_cumulative[len(prev_text) :]
prev_text = clean_cumulative
if not new_text:
continue
chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(content = new_text),
finish_reason = None,
)
],
)
yield f"data: {chunk.model_dump_json(exclude_none = True)}\n\n"
final_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(),
finish_reason = "stop",
)
],
)
yield f"data: {final_chunk.model_dump_json(exclude_none = True)}\n\n"
yield "data: [DONE]\n\n"
except asyncio.CancelledError:
cancel_event.set()
backend.reset_generation_state()
raise
except Exception:
backend.reset_generation_state()
# Generic wire message; full trace stays in the log
# (CWE-209: transformers/torch errors may leak paths).
logger.exception("safetensors tool stream error")
error_chunk = {
"error": {
"message": "An internal error occurred.",
"type": "server_error",
},
}
yield f"data: {json.dumps(error_chunk)}\n\n"
finally:
_sf_tracker.__exit__(None, None, None)
if payload.stream:
return StreamingResponse(
sf_tool_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
# Non-streaming JSON: drain the loop, build one ChatCompletion.
try:
def _drain_to_text():
full_text = ""
gen = sf_generate_with_tools()
for event in gen:
if cancel_event.is_set():
break
if event.get("type") == "content":
full_text = _TOOL_XML_RE.sub("", event.get("text", ""))
return full_text
content_text = await asyncio.to_thread(_drain_to_text)
response = ChatCompletion(
id = completion_id,
created = created,
model = model_name,
choices = [
CompletionChoice(
message = CompletionMessage(content = content_text),
finish_reason = "stop",
)
],
)
return JSONResponse(content = response.model_dump())
except Exception:
backend.reset_generation_state()
# CWE-209: generic detail; full trace in log.
logger.exception("safetensors tool completion error")
raise HTTPException(
status_code = 500,
detail = "An internal error occurred.",
)
finally:
_sf_tracker.__exit__(None, None, None)
# Shared generation kwargs
gen_kwargs = dict(
messages = chat_messages,
system_prompt = system_prompt,
image = image,
temperature = payload.temperature,
top_p = payload.top_p,
top_k = payload.top_k,
min_p = payload.min_p,
max_new_tokens = payload.max_tokens or 2048,
repetition_penalty = payload.repetition_penalty,
)
# Forward reasoning kwargs; the worker/template wrapper peels off
# any the template doesn't accept.
if payload.enable_thinking is not None:
gen_kwargs["enable_thinking"] = payload.enable_thinking
if payload.reasoning_effort is not None:
gen_kwargs["reasoning_effort"] = payload.reasoning_effort
if payload.preserve_thinking is not None:
gen_kwargs["preserve_thinking"] = payload.preserve_thinking
if payload.use_adapter is not None:
def generate():
return backend.generate_with_adapter_control(
use_adapter = payload.use_adapter,
cancel_event = cancel_event,
**gen_kwargs,
)
else:
def generate():
return backend.generate_chat_response(
cancel_event = cancel_event, **gen_kwargs
)
# ── Streaming response ────────────────────────────────────────
if payload.stream:
_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_tracker = _TrackedCancel(cancel_event, *_cancel_keys)
_tracker.__enter__()
async def stream_chunks():
try:
first_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(role = "assistant"),
finish_reason = None,
)
],
)
yield f"data: {first_chunk.model_dump_json(exclude_none = True)}\n\n"
prev_text = ""
# Run sync generator in thread pool to avoid blocking
# the event loop. Critical for compare mode: two SSE
# requests arrive concurrently but the orchestrator
# serializes them via _gen_lock. Without run_in_executor
# the second request's blocking lock acquisition would
# freeze the entire event loop, stalling both streams.
_DONE = object() # sentinel for generator exhaustion
loop = asyncio.get_event_loop()
gen = generate()
while True:
if cancel_event.is_set():
backend.reset_generation_state()
break
# next(gen, _DONE) returns _DONE instead of raising
# StopIteration — StopIteration cannot propagate
# through asyncio futures (Python limitation).
cumulative = await loop.run_in_executor(None, next, gen, _DONE)
if cumulative is _DONE:
break
if await request.is_disconnected():
cancel_event.set()
backend.reset_generation_state()
return
new_text = cumulative[len(prev_text) :]
prev_text = cumulative
if not new_text:
continue
chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(content = new_text),
finish_reason = None,
)
],
)
yield f"data: {chunk.model_dump_json(exclude_none = True)}\n\n"
final_chunk = ChatCompletionChunk(
id = completion_id,
created = created,
model = model_name,
choices = [
ChunkChoice(
delta = ChoiceDelta(),
finish_reason = "stop",
)
],
)
yield f"data: {final_chunk.model_dump_json(exclude_none = True)}\n\n"
yield "data: [DONE]\n\n"
except asyncio.CancelledError:
cancel_event.set()
backend.reset_generation_state()
raise
except Exception as e:
backend.reset_generation_state()
logger.error(f"Error during OpenAI streaming: {e}", exc_info = True)
error_chunk = {
"error": {
"message": _friendly_error(e),
"type": "server_error",
},
}
yield f"data: {json.dumps(error_chunk)}\n\n"
finally:
_tracker.__exit__(None, None, None)
return StreamingResponse(
stream_chunks(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
# ── Non-streaming response ────────────────────────────────────
else:
try:
full_text = ""
for token in generate():
full_text = token
response = ChatCompletion(
id = completion_id,
created = created,
model = model_name,
choices = [
CompletionChoice(
message = CompletionMessage(content = full_text),
finish_reason = "stop",
)
],
)
return JSONResponse(content = response.model_dump())
except Exception as e:
backend.reset_generation_state()
logger.error(f"Error during OpenAI completion: {e}", exc_info = True)
raise HTTPException(status_code = 500, detail = str(e))
# =====================================================================
# Sandbox file serving (/sandbox/{session_id}/{filename})
# =====================================================================
_SANDBOX_MEDIA_TYPES = {
".png": "image/png",
".jpg": "image/jpeg",
".jpeg": "image/jpeg",
".gif": "image/gif",
".webp": "image/webp",
".bmp": "image/bmp",
}
@router.get("/sandbox/{session_id}/{filename}")
async def serve_sandbox_file(
session_id: str,
filename: str,
request: Request,
token: Optional[str] = None,
):
"""
Serve image files created by Python tool execution.
Accepts auth via Authorization header OR ?token= query param
(needed because <img src> cannot send custom headers).
"""
from fastapi.responses import FileResponse
# ── Authentication (header or query param) ──────────────────
auth_header = request.headers.get("authorization")
if auth_header and auth_header.lower().startswith("bearer "):
jwt_token = auth_header[7:]
elif token:
jwt_token = token
else:
raise HTTPException(
status_code = status.HTTP_401_UNAUTHORIZED,
detail = "Missing authentication token",
)
from fastapi.security import HTTPAuthorizationCredentials
creds = HTTPAuthorizationCredentials(scheme = "Bearer", credentials = jwt_token)
await get_current_subject(creds)
# ── Filename sanitization ───────────────────────────────────
safe_filename = os.path.basename(filename)
if not safe_filename or safe_filename in (".", ".."):
raise HTTPException(status_code = 404, detail = "Not found")
# ── Extension allowlist ─────────────────────────────────────
ext = os.path.splitext(safe_filename)[1].lower()
media_type = _SANDBOX_MEDIA_TYPES.get(ext)
if not media_type:
raise HTTPException(
status_code = status.HTTP_403_FORBIDDEN,
detail = "File type not allowed",
)
# ── Path containment check ──────────────────────────────────
home = os.path.expanduser("~")
sandbox_root = os.path.realpath(os.path.join(home, "studio_sandbox"))
safe_session = os.path.basename(session_id.replace("..", ""))
if not safe_session:
raise HTTPException(status_code = 404, detail = "Not found")
file_path = os.path.realpath(
os.path.join(sandbox_root, safe_session, safe_filename)
)
if not file_path.startswith(sandbox_root + os.sep):
raise HTTPException(
status_code = status.HTTP_403_FORBIDDEN,
detail = "Access denied",
)
if not os.path.isfile(file_path):
raise HTTPException(status_code = 404, detail = "Not found")
return FileResponse(
path = file_path,
media_type = media_type,
headers = {
"Cache-Control": "private, no-store",
"X-Content-Type-Options": "nosniff",
},
)
# =====================================================================
# OpenAI-Compatible Models Listing (/models → /v1/models)
# =====================================================================
@router.get("/models")
async def openai_list_models(
current_subject: str = Depends(get_current_subject),
):
"""
OpenAI-compatible model listing endpoint.
Returns the currently loaded model in the format expected by
OpenAI-compatible clients (``GET /v1/models``).
"""
models = []
# Check GGUF backend
llama_backend = get_llama_cpp_backend()
if llama_backend.is_loaded:
models.append(
{
"id": llama_backend.model_identifier,
"object": "model",
"owned_by": "local",
}
)
# Check Unsloth backend
backend = get_inference_backend()
if backend.active_model_name:
models.append(
{
"id": backend.active_model_name,
"object": "model",
"owned_by": "local",
}
)
return {"object": "list", "data": models}
# =====================================================================
# OpenAI-Compatible Completions Proxy (/completions → /v1/completions)
# =====================================================================
@router.post("/completions")
async def openai_completions(
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
OpenAI-compatible text completions endpoint (non-chat).
Transparently proxies to the running llama-server's ``/v1/completions``.
Only available when a GGUF model is loaded.
"""
llama_backend = get_llama_cpp_backend()
if not llama_backend.is_loaded:
raise HTTPException(
status_code = 503,
detail = "No GGUF model loaded. Load a GGUF model first.",
)
body = await request.json()
target_url = f"{llama_backend.base_url}/v1/completions"
is_stream = body.get("stream", False)
if is_stream:
async def _stream():
# Manual httpx client/response lifecycle AND explicit
# aiter_bytes() iterator close — see _anthropic_passthrough_stream
# for the full rationale. Saving `bytes_iter = resp.aiter_bytes()`
# and `await bytes_iter.aclose()` in the finally block is the
# part that matters for avoiding the Python 3.13 + httpcore
# 1.0.x "Exception ignored in: <async_generator>" / anyio
# cancel-scope trace: an anonymous async for leaves the
# iterator unclosed, so Python's asyncgen GC finalizer runs
# cleanup on a later pass in a different asyncio task.
client = httpx.AsyncClient(timeout = 600)
resp = None
bytes_iter = None
try:
req = client.build_request("POST", target_url, json = body)
resp = await client.send(req, stream = True)
bytes_iter = resp.aiter_bytes()
async for chunk in bytes_iter:
yield chunk
except Exception as e:
logger.error("openai_completions stream error: %s", e)
finally:
if bytes_iter is not None:
try:
await bytes_iter.aclose()
except Exception:
pass
if resp is not None:
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
return StreamingResponse(_stream(), media_type = "text/event-stream")
else:
async with httpx.AsyncClient() as client:
resp = await client.post(target_url, json = body, timeout = 600)
return Response(
content = resp.content,
status_code = resp.status_code,
media_type = "application/json",
)
# =====================================================================
# OpenAI-Compatible Embeddings Proxy (/embeddings → /v1/embeddings)
# =====================================================================
@router.post("/embeddings")
async def openai_embeddings(
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
OpenAI-compatible embeddings endpoint.
Transparently proxies to the running llama-server's ``/v1/embeddings``.
Only available when a GGUF model is loaded.
Note: the loaded model must support pooling; otherwise llama-server
will return an error (expected).
"""
llama_backend = get_llama_cpp_backend()
if not llama_backend.is_loaded:
raise HTTPException(
status_code = 503,
detail = "No GGUF model loaded. Load a GGUF model first.",
)
body = await request.json()
target_url = f"{llama_backend.base_url}/v1/embeddings"
async with httpx.AsyncClient() as client:
resp = await client.post(target_url, json = body, timeout = 600)
return Response(
content = resp.content,
status_code = resp.status_code,
media_type = "application/json",
)
# =====================================================================
# OpenAI Responses API (/responses → /v1/responses)
# =====================================================================
def _translate_responses_tools_to_chat(
tools: Optional[list[dict]],
) -> Optional[list[dict]]:
"""Translate Responses-shape function tools to the Chat Completions nested shape.
Responses uses a flat shape per tool entry::
{"type": "function", "name": "...", "description": "...",
"parameters": {...}, "strict": true}
The Chat Completions / llama-server passthrough expects the nested shape::
{"type": "function",
"function": {"name": "...", "description": "...",
"parameters": {...}, "strict": true}}
Only ``type=="function"`` entries are forwarded. Built-in Responses tools
(``web_search``, ``file_search``, ``mcp``, ...) are dropped because
llama-server does not implement them server-side; keeping them in the
request would produce an opaque upstream 400.
"""
if not tools:
return None
out: list[dict] = []
for tool in tools:
if not isinstance(tool, dict):
continue
if tool.get("type") != "function":
continue
fn: dict = {}
if "name" in tool:
fn["name"] = tool["name"]
if tool.get("description") is not None:
fn["description"] = tool["description"]
if tool.get("parameters") is not None:
fn["parameters"] = tool["parameters"]
if tool.get("strict") is not None:
fn["strict"] = tool["strict"]
out.append({"type": "function", "function": fn})
return out or None
def _translate_responses_tool_choice_to_chat(tool_choice: Any) -> Any:
"""Translate a Responses-shape ``tool_choice`` to the Chat Completions shape.
String values (``"auto"``/``"none"``/``"required"``) pass through unchanged.
The Responses forcing object ``{"type": "function", "name": "X"}`` is
converted to Chat Completions' ``{"type": "function", "function": {"name": "X"}}``.
Unknown / built-in tool choices are forwarded as-is; llama-server ignores
what it doesn't recognise.
"""
if tool_choice is None:
return None
if isinstance(tool_choice, str):
return tool_choice
if (
isinstance(tool_choice, dict)
and tool_choice.get("type") == "function"
and "name" in tool_choice
and "function" not in tool_choice
):
return {"type": "function", "function": {"name": tool_choice["name"]}}
return tool_choice
def _responses_message_text(content: Union[str, list]) -> str:
"""Flatten a ResponsesInputMessage ``content`` into a plain text string.
Used for system/developer message hoisting and for assistant-replay
(``output_text``) messages when images/unknown parts are irrelevant.
Returns an empty string for empty input.
"""
if isinstance(content, str):
return content
parts: list[str] = []
for part in content or []:
if isinstance(part, (ResponsesInputTextPart, ResponsesOutputTextPart)):
parts.append(part.text)
return "\n".join(parts)
def _normalise_responses_input(payload: ResponsesRequest) -> list[ChatMessage]:
"""Convert a ResponsesRequest's ``input`` into Chat-format ``ChatMessage`` list.
Handles the three input item shapes allowed by the Responses API:
- ``ResponsesInputMessage`` — regular chat messages (text or multimodal).
- ``ResponsesFunctionCallInputItem`` — a prior assistant tool call replayed
on a follow-up turn. Converted into an assistant message carrying a
Chat Completions ``tool_calls`` entry keyed by ``call_id``.
- ``ResponsesFunctionCallOutputInputItem`` — a tool result the client is
returning. Converted into a ``role="tool"`` message with ``tool_call_id``
set to the originating ``call_id`` so llama-server can reconcile the
call with its result.
System / developer content is collected from ``instructions`` *and* from
any ``role="system"`` / ``role="developer"`` entries in ``input``, then
merged into a single ``role="system"`` message placed at the top of the
returned list. This satisfies strict chat templates (harmony / gpt-oss,
Qwen3, ...) whose Jinja raises ``"System message must be at the
beginning."`` when more than one system message is present or when a
system message appears after a user turn — the exact pattern the OpenAI
Codex CLI hits, since Codex sets ``instructions`` *and* also sends a
developer message in ``input``.
"""
system_parts: list[str] = []
messages: list[ChatMessage] = []
if payload.instructions:
system_parts.append(payload.instructions)
# Simple string input
if isinstance(payload.input, str):
if payload.input:
messages.append(ChatMessage(role = "user", content = payload.input))
if system_parts:
merged = "\n\n".join(p for p in system_parts if p)
return [ChatMessage(role = "system", content = merged), *messages]
return messages
for item in payload.input:
if isinstance(item, ResponsesFunctionCallInputItem):
messages.append(
ChatMessage(
role = "assistant",
content = None,
tool_calls = [
{
"id": item.call_id,
"type": "function",
"function": {
"name": item.name,
"arguments": item.arguments,
},
}
],
)
)
continue
if isinstance(item, ResponsesFunctionCallOutputInputItem):
# Chat Completions `role="tool"` requires a string content; if a
# Responses client sends a content-array output, serialize it.
output = item.output
if not isinstance(output, str):
output = json.dumps(output)
messages.append(
ChatMessage(
role = "tool",
tool_call_id = item.call_id,
content = output,
)
)
continue
if isinstance(item, ResponsesUnknownInputItem):
# Reasoning items and any other unmodelled top-level Responses
# item types are silently dropped — llama-server-backed GGUFs
# cannot consume them and our lenient validation let them in so
# unrelated turns don't 422.
continue
# ResponsesInputMessage — hoist system/developer to the top, merge.
if item.role in ("system", "developer"):
hoisted = _responses_message_text(item.content)
if hoisted:
system_parts.append(hoisted)
continue
if isinstance(item.content, str):
messages.append(ChatMessage(role = item.role, content = item.content))
continue
# Assistant-replay turns come back as content = [output_text, ...].
# Chat Completions' assistant role expects a plain string, not a
# multimodal content array, so flatten output_text (and any stray
# input_text / unknown text) to a single string.
if item.role == "assistant":
text = _responses_message_text(item.content)
if text:
messages.append(ChatMessage(role = "assistant", content = text))
continue
# User (and any other remaining roles) — keep multimodal when
# present, drop unknown content parts silently.
parts: list = []
for part in item.content:
if isinstance(part, (ResponsesInputTextPart, ResponsesOutputTextPart)):
parts.append(TextContentPart(type = "text", text = part.text))
elif isinstance(part, ResponsesInputImagePart):
parts.append(
ImageContentPart(
type = "image_url",
image_url = ImageUrl(url = part.image_url, detail = part.detail),
)
)
# ResponsesUnknownContentPart and anything else: drop.
if parts:
# Collapse single-text-part content to a plain string so roles
# that reject multimodal arrays (e.g. legacy templates) still
# accept the message.
if len(parts) == 1 and isinstance(parts[0], TextContentPart):
messages.append(ChatMessage(role = item.role, content = parts[0].text))
else:
messages.append(ChatMessage(role = item.role, content = parts))
if system_parts:
merged = "\n\n".join(p for p in system_parts if p)
return [ChatMessage(role = "system", content = merged), *messages]
return messages
def _build_chat_request(
payload: ResponsesRequest, messages: list[ChatMessage], stream: bool
) -> ChatCompletionRequest:
"""Build a ChatCompletionRequest from a ResponsesRequest.
Tools and ``tool_choice`` are translated from the flat Responses shape to
the nested Chat Completions shape here so the existing #5099
``/v1/chat/completions`` client-side pass-through picks them up without
further modification.
"""
chat_kwargs: dict = dict(
model = payload.model,
messages = messages,
stream = stream,
)
if payload.temperature is not None:
chat_kwargs["temperature"] = payload.temperature
if payload.top_p is not None:
chat_kwargs["top_p"] = payload.top_p
if payload.max_output_tokens is not None:
chat_kwargs["max_tokens"] = payload.max_output_tokens
chat_tools = _translate_responses_tools_to_chat(payload.tools)
if chat_tools is not None:
chat_kwargs["tools"] = chat_tools
chat_tool_choice = _translate_responses_tool_choice_to_chat(payload.tool_choice)
if chat_tool_choice is not None:
chat_kwargs["tool_choice"] = chat_tool_choice
req = ChatCompletionRequest(**chat_kwargs)
# `parallel_tool_calls` is not a first-class field on ChatCompletionRequest,
# but the model allows extras and _build_openai_passthrough_body forwards
# only explicitly-known fields. Llama-server does not currently implement
# parallel_tool_calls semantics, so we accept-and-ignore it on the
# Responses side to avoid breaking SDK clients that always send it.
return req
def _chat_tool_calls_to_responses_output(tool_calls: list[dict]) -> list[dict]:
"""Map Chat Completions ``tool_calls`` into Responses ``function_call`` output items.
The Chat Completions id (``call_xxx``) is the shared correlation key across
turns in the OpenAI Responses API — it is stored as ``call_id`` on the
output item and must be echoed back by the client as
``function_call_output.call_id`` on the next turn.
"""
items: list[dict] = []
for tc in tool_calls:
if tc.get("type") != "function":
continue
fn = tc.get("function") or {}
items.append(
ResponsesOutputFunctionCall(
call_id = tc.get("id", ""),
name = fn.get("name", ""),
arguments = fn.get("arguments", "") or "",
status = "completed",
).model_dump()
)
return items
async def _responses_non_streaming(
payload: ResponsesRequest,
messages: list[ChatMessage],
request: Request,
) -> JSONResponse:
"""Handle a non-streaming Responses API call."""
chat_req = _build_chat_request(payload, messages, stream = False)
result = await openai_chat_completions(chat_req, request)
# openai_chat_completions returns a JSONResponse for non-streaming
if isinstance(result, JSONResponse):
body = json.loads(result.body.decode())
elif isinstance(result, Response):
body = json.loads(result.body.decode())
else:
body = result
choices = body.get("choices", [])
text = ""
tool_calls: list[dict] = []
if choices:
msg = choices[0].get("message", {}) or {}
text = msg.get("content", "") or ""
tool_calls = msg.get("tool_calls") or []
usage_data = body.get("usage", {})
input_tokens = usage_data.get("prompt_tokens", 0)
output_tokens = usage_data.get("completion_tokens", 0)
resp_id = f"resp_{uuid.uuid4().hex[:12]}"
# Responses API emits each tool call as its own top-level output item,
# alongside an optional assistant text message. Emit the text message
# only when the model actually produced content, so clients that expect
# a pure tool-call turn (finish_reason="tool_calls") don't see a spurious
# empty message item.
output_items: list[dict] = []
if text:
msg_id = f"msg_{uuid.uuid4().hex[:12]}"
output_items.append(
ResponsesOutputMessage(
id = msg_id,
status = "completed",
role = "assistant",
content = [ResponsesOutputTextContent(text = text)],
).model_dump()
)
output_items.extend(_chat_tool_calls_to_responses_output(tool_calls))
response = ResponsesResponse(
id = resp_id,
created_at = int(time.time()),
status = "completed",
model = body.get("model", payload.model),
output = output_items,
usage = ResponsesUsage(
input_tokens = input_tokens,
output_tokens = output_tokens,
total_tokens = input_tokens + output_tokens,
),
temperature = payload.temperature,
top_p = payload.top_p,
max_output_tokens = payload.max_output_tokens,
instructions = payload.instructions,
)
return JSONResponse(content = response.model_dump())
async def _responses_stream(
payload: ResponsesRequest,
messages: list[ChatMessage],
request: Request,
):
"""Handle a streaming Responses API call, emitting named SSE events.
For GGUF models the request goes directly to llama-server's
``/v1/chat/completions`` endpoint from inside the StreamingResponse
child task — a single httpx lifecycle, a single async generator.
Wrapping the existing ``openai_chat_completions`` pass-through (which
already does its own httpx lifecycle) stacks two generators: Python
3.13 + httpcore 1.0.x then loses the close-propagation chain on the
innermost ``HTTP11ConnectionByteStream`` at asyncgen finalisation,
tripping "Attempted to exit cancel scope in a different task" /
"async generator ignored GeneratorExit". The direct path avoids that
altogether. Non-GGUF falls back to the wrapper (which doesn't use
httpx, so the issue doesn't apply).
Text deltas arrive as ``response.output_text.delta`` on a single
``message`` output item at ``output_index=0``. Each tool call from
``delta.tool_calls[]`` is promoted to its own top-level ``function_call``
output item (one per distinct ``tool_calls[].index``), and relayed as
``response.function_call_arguments.delta`` / ``.done`` events so clients
(Codex, OpenAI Python SDK) can reconstruct the call incrementally and
reply with a ``function_call_output`` item on the next turn.
"""
resp_id = f"resp_{uuid.uuid4().hex[:12]}"
msg_id = f"msg_{uuid.uuid4().hex[:12]}"
created_at = int(time.time())
chat_req = _build_chat_request(payload, messages, stream = True)
llama_backend = get_llama_cpp_backend()
if not llama_backend.is_loaded:
# The direct pass-through is GGUF-only. Non-GGUF /v1/responses
# streaming isn't a Codex-compatible path today and wrapping the
# transformers backend's streaming generator here would re-
# introduce the double-layer asyncgen close pattern that produces
# "Attempted to exit cancel scope in a different task" on Python
# 3.13. Surface a typed 400 so the client sees a useful error
# instead of a dangling stream.
raise HTTPException(
status_code = 400,
detail = (
"Streaming /v1/responses requires a GGUF model loaded via "
"llama-server. Use non-streaming /v1/responses, "
"/v1/chat/completions, or load a GGUF model."
),
)
# Direct pass-through bypasses the openai_chat_completions image gate.
if not llama_backend.is_vision and any(
isinstance(m.content, list)
and any(isinstance(p, ImageContentPart) for p in m.content)
for m in messages
):
raise HTTPException(
status_code = 400,
detail = "Image provided but current GGUF model does not support vision.",
)
body = _build_openai_passthrough_body(
chat_req, backend_ctx = llama_backend.context_length
)
target_url = f"{llama_backend.base_url}/v1/chat/completions"
async def event_generator():
full_text = ""
input_tokens = 0
output_tokens = 0
# Per-tool-call state keyed by the Chat Completions `tool_calls[].index`
# which stays stable across chunks for the same call. Values are:
# {output_index, item_id, call_id, name, arguments, opened}
tool_call_state: dict[int, dict] = {}
# Text message lives at output_index 0; tool calls claim 1, 2, ...
next_output_index = 1
def _snapshot_output() -> list[dict]:
"""Snapshot of all completed output items for response.completed."""
items: list[dict] = [
{
"type": "message",
"id": msg_id,
"status": "completed",
"role": "assistant",
"content": [
{
"type": "output_text",
"text": full_text,
"annotations": [],
}
],
}
]
for st in sorted(tool_call_state.values(), key = lambda s: s["output_index"]):
items.append(
{
"type": "function_call",
"id": st["item_id"],
"status": "completed",
"call_id": st["call_id"],
"name": st["name"],
"arguments": st["arguments"],
}
)
return items
# ── Preamble events ──
yield f"event: response.created\ndata: {json.dumps({'type': 'response.created', 'response': {'id': resp_id, 'object': 'response', 'created_at': created_at, 'status': 'in_progress', 'model': payload.model, 'output': [], 'usage': {'input_tokens': 0, 'output_tokens': 0, 'total_tokens': 0}}})}\n\n"
# output_item.added (text message at output_index 0)
output_item = {
"type": "message",
"id": msg_id,
"status": "in_progress",
"role": "assistant",
"content": [],
}
yield f"event: response.output_item.added\ndata: {json.dumps({'type': 'response.output_item.added', 'output_index': 0, 'item': output_item})}\n\n"
# content_part.added
content_part = {"type": "output_text", "text": "", "annotations": []}
yield f"event: response.content_part.added\ndata: {json.dumps({'type': 'response.content_part.added', 'item_id': msg_id, 'output_index': 0, 'content_index': 0, 'part': content_part})}\n\n"
# ── Direct httpx lifecycle to llama-server ──
# Full same-task open + close, identical pattern to
# _openai_passthrough_stream and _anthropic_passthrough_stream:
# no `async with`, explicit aclose of lines_iter BEFORE resp /
# client so the innermost httpcore byte stream is finalised in
# this task (not via Python's asyncgen GC in a sibling task).
client = httpx.AsyncClient(timeout = 600)
resp = None
lines_iter = None
try:
req = client.build_request("POST", target_url, json = body)
try:
resp = await client.send(req, stream = True)
except httpx.RequestError as e:
logger.error("responses stream: upstream unreachable: %s", e)
yield f"event: response.failed\ndata: {json.dumps({'type': 'response.failed', 'response': {'id': resp_id, 'object': 'response', 'created_at': created_at, 'status': 'failed', 'model': payload.model, 'output': [], 'error': {'code': 502, 'message': _friendly_error(e)}}})}\n\n"
return
if resp.status_code != 200:
err_bytes = await resp.aread()
err_text = err_bytes.decode("utf-8", errors = "replace")
logger.error(
"responses stream upstream error: status=%s body=%s",
resp.status_code,
err_text[:500],
)
yield f"event: response.failed\ndata: {json.dumps({'type': 'response.failed', 'response': {'id': resp_id, 'object': 'response', 'created_at': created_at, 'status': 'failed', 'model': payload.model, 'output': [], 'error': {'code': resp.status_code, 'message': f'llama-server error: {err_text[:500]}'}}})}\n\n"
return
lines_iter = resp.aiter_lines()
async for raw_line in lines_iter:
if await request.is_disconnected():
break
if not raw_line:
continue
if not raw_line.startswith("data: "):
continue
data_str = raw_line[6:]
if data_str.strip() == "[DONE]":
break
try:
chunk_data = json.loads(data_str)
except json.JSONDecodeError:
continue
choices = chunk_data.get("choices", [])
if not choices:
usage = chunk_data.get("usage")
if usage:
input_tokens = usage.get("prompt_tokens", input_tokens)
output_tokens = usage.get("completion_tokens", output_tokens)
continue
delta = choices[0].get("delta", {}) or {}
content = delta.get("content")
if content:
full_text += content
delta_event = {
"type": "response.output_text.delta",
"item_id": msg_id,
"output_index": 0,
"content_index": 0,
"delta": content,
}
yield f"event: response.output_text.delta\ndata: {json.dumps(delta_event)}\n\n"
for tc in delta.get("tool_calls") or []:
idx = tc.get("index", 0)
st = tool_call_state.get(idx)
fn = tc.get("function") or {}
if st is None:
# First chunk for this tool call — allocate an
# output_index and emit output_item.added.
st = {
"output_index": next_output_index,
"item_id": f"fc_{uuid.uuid4().hex[:12]}",
"call_id": tc.get("id") or "",
"name": fn.get("name") or "",
"arguments": "",
"opened": False,
}
next_output_index += 1
tool_call_state[idx] = st
else:
# Later chunks sometimes carry the id/name only
# once; merge when present.
if tc.get("id") and not st["call_id"]:
st["call_id"] = tc["id"]
if fn.get("name") and not st["name"]:
st["name"] = fn["name"]
if not st["opened"] and st["call_id"] and st["name"]:
item_added = {
"type": "response.output_item.added",
"output_index": st["output_index"],
"item": {
"type": "function_call",
"id": st["item_id"],
"status": "in_progress",
"call_id": st["call_id"],
"name": st["name"],
"arguments": "",
},
}
yield f"event: response.output_item.added\ndata: {json.dumps(item_added)}\n\n"
st["opened"] = True
arg_delta = fn.get("arguments") or ""
if arg_delta and st["opened"]:
st["arguments"] += arg_delta
args_delta_event = {
"type": "response.function_call_arguments.delta",
"item_id": st["item_id"],
"output_index": st["output_index"],
"delta": arg_delta,
}
yield f"event: response.function_call_arguments.delta\ndata: {json.dumps(args_delta_event)}\n\n"
elif arg_delta:
# Buffer the args until we can open the item
# (id/name arrive in the same chunk as the first
# arg delta for some models — but if not, stash).
st["arguments"] += arg_delta
usage = chunk_data.get("usage")
if usage:
input_tokens = usage.get("prompt_tokens", input_tokens)
output_tokens = usage.get("completion_tokens", output_tokens)
except Exception as e:
logger.error("responses stream error: %s", e)
finally:
if lines_iter is not None:
try:
await lines_iter.aclose()
except Exception:
pass
if resp is not None:
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
# ── Closing events for tool calls ──
for st in sorted(tool_call_state.values(), key = lambda s: s["output_index"]):
# If id/name never arrived (malformed upstream), synthesise so
# the client still sees a coherent frame sequence.
if not st["opened"]:
if not st["call_id"]:
st["call_id"] = f"call_{uuid.uuid4().hex[:12]}"
item_added = {
"type": "response.output_item.added",
"output_index": st["output_index"],
"item": {
"type": "function_call",
"id": st["item_id"],
"status": "in_progress",
"call_id": st["call_id"],
"name": st["name"],
"arguments": "",
},
}
yield f"event: response.output_item.added\ndata: {json.dumps(item_added)}\n\n"
if st["arguments"]:
yield (
"event: response.function_call_arguments.delta\n"
"data: "
+ json.dumps(
{
"type": "response.function_call_arguments.delta",
"item_id": st["item_id"],
"output_index": st["output_index"],
"delta": st["arguments"],
}
)
+ "\n\n"
)
st["opened"] = True
args_done = {
"type": "response.function_call_arguments.done",
"item_id": st["item_id"],
"output_index": st["output_index"],
"name": st["name"],
"arguments": st["arguments"],
}
yield f"event: response.function_call_arguments.done\ndata: {json.dumps(args_done)}\n\n"
item_done = {
"type": "response.output_item.done",
"output_index": st["output_index"],
"item": {
"type": "function_call",
"id": st["item_id"],
"status": "completed",
"call_id": st["call_id"],
"name": st["name"],
"arguments": st["arguments"],
},
}
yield f"event: response.output_item.done\ndata: {json.dumps(item_done)}\n\n"
# ── Closing events for text message ──
yield f"event: response.output_text.done\ndata: {json.dumps({'type': 'response.output_text.done', 'item_id': msg_id, 'output_index': 0, 'content_index': 0, 'text': full_text})}\n\n"
yield f"event: response.content_part.done\ndata: {json.dumps({'type': 'response.content_part.done', 'item_id': msg_id, 'output_index': 0, 'content_index': 0, 'part': {'type': 'output_text', 'text': full_text, 'annotations': []}})}\n\n"
yield f"event: response.output_item.done\ndata: {json.dumps({'type': 'response.output_item.done', 'output_index': 0, 'item': {'type': 'message', 'id': msg_id, 'status': 'completed', 'role': 'assistant', 'content': [{'type': 'output_text', 'text': full_text, 'annotations': []}]}})}\n\n"
# response.completed
total_tokens = input_tokens + output_tokens
completed_response = {
"type": "response.completed",
"response": {
"id": resp_id,
"object": "response",
"created_at": created_at,
"status": "completed",
"model": payload.model,
"output": _snapshot_output(),
"usage": {
"input_tokens": input_tokens,
"output_tokens": output_tokens,
"total_tokens": total_tokens,
},
},
}
yield f"event: response.completed\ndata: {json.dumps(completed_response)}\n\n"
return StreamingResponse(
event_generator(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
@router.post("/responses")
async def openai_responses(
payload: ResponsesRequest,
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
OpenAI Responses API endpoint.
Accepts the Responses-format request, converts it to a
ChatCompletionRequest internally, and returns a response
matching the OpenAI Responses API schema (output array,
input_tokens/output_tokens, named SSE events for streaming).
"""
messages = _normalise_responses_input(payload)
if not messages:
raise HTTPException(status_code = 400, detail = "No input provided.")
if payload.stream:
return await _responses_stream(payload, messages, request)
return await _responses_non_streaming(payload, messages, request)
# =====================================================================
# Anthropic-Compatible Messages API (/messages → /v1/messages)
# =====================================================================
_STUDIO_ANTHROPIC_TOOL_ALIASES = {
"web_search": "web_search",
"web_search_20250305": "web_search",
"web_fetch": "web_search",
"web_fetch_20250910": "web_search",
"web_fetch_20260209": "web_search",
"python": "python",
"terminal": "terminal",
}
def _anthropic_requested_studio_tools(tools: Optional[list]) -> set[str]:
requested: set[str] = set()
for tool in tools or []:
td = tool if isinstance(tool, dict) else tool.model_dump()
# Client tools always carry input_schema; server tools never do.
if td.get("input_schema") is not None:
continue
# Anthropic dispatches server tools by `type` (not by bare `name`);
# matching name too would let a malformed client tool like
# `{"name": "python"}` silently flip into server-execution mode.
type_ = td.get("type")
if isinstance(type_, str) and type_ in _STUDIO_ANTHROPIC_TOOL_ALIASES:
requested.add(_STUDIO_ANTHROPIC_TOOL_ALIASES[type_])
return requested
def _select_anthropic_server_tools(
all_tools: list[dict],
requested_studio_tools: set[str],
enabled_tools: Optional[list[str]],
) -> list[dict]:
"""Select Studio tools requested through Anthropic tools and extensions."""
if not requested_studio_tools and enabled_tools is None:
return all_tools
selected_names = set(requested_studio_tools)
if enabled_tools is not None:
selected_names.update(enabled_tools)
return [tool for tool in all_tools if tool["function"]["name"] in selected_names]
def _normalize_anthropic_openai_images(
openai_messages: list[dict], is_vision: bool
) -> bool:
"""Enforce the vision guard on translated Anthropic messages and
normalize any ``image_url`` parts with base64 data URLs to PNG.
llama-server's stb_image only handles a few formats (JPEG/PNG/BMP/…);
Anthropic clients commonly send JPEG or WebP, and Claude Code sends
WebP. Re-encoding everything to PNG mirrors the behavior of
`_openai_messages_for_passthrough` / the GGUF branch of
`/v1/chat/completions` so the two endpoints agree.
Mutates ``openai_messages`` in place. Returns ``True`` when any
image part was seen (so the caller can skip a second scan). Raises
HTTPException(400) when images are present but the active model is
not a vision model, or when an image cannot be decoded.
"""
from PIL import Image
has_image = False
for msg in openai_messages:
content = msg.get("content")
if not isinstance(content, list):
continue
for part in content:
if part.get("type") != "image_url":
continue
has_image = True
if not is_vision:
raise HTTPException(
status_code = 400,
detail = "Image provided but current GGUF model does not support vision.",
)
url = (part.get("image_url") or {}).get("url", "")
if not url.startswith("data:"):
# Remote URLs are forwarded as-is; llama-server will
# fetch (or fail) per its own support matrix.
continue
try:
_, b64data = url.split(",", 1)
raw = base64.b64decode(b64data)
img = Image.open(io.BytesIO(raw)).convert("RGB")
buf = io.BytesIO()
img.save(buf, format = "PNG")
png_b64 = base64.b64encode(buf.getvalue()).decode("ascii")
except Exception:
raise HTTPException(
status_code = 400,
detail = "Failed to process image.",
)
part["image_url"] = {"url": f"data:image/png;base64,{png_b64}"}
return has_image
@router.post("/messages")
async def anthropic_messages(
payload: AnthropicMessagesRequest,
request: Request,
current_subject: str = Depends(get_current_subject),
):
"""
Anthropic-compatible Messages API endpoint.
Translates Anthropic message format to internal OpenAI format, runs
through the existing agentic tool loop when tools are provided, and
returns responses in Anthropic Messages API format (streaming SSE or
non-streaming JSON).
"""
llama_backend = get_llama_cpp_backend()
if not llama_backend.is_loaded:
raise HTTPException(
status_code = 503,
detail = "No GGUF model loaded. Load a GGUF model first.",
)
model_name = getattr(llama_backend, "model_identifier", None) or payload.model
message_id = f"msg_{uuid.uuid4().hex[:24]}"
# ── Translate Anthropic → OpenAI ──────────────────────────
openai_messages = anthropic_messages_to_openai(
[m.model_dump() for m in payload.messages],
payload.system,
)
openai_messages = _drop_empty_assistant_sentinels(openai_messages)
# Enforce vision guard + re-encode embedded images to PNG so the
# Anthropic endpoint matches the behavior of /v1/chat/completions.
_has_image = _normalize_anthropic_openai_images(
openai_messages, llama_backend.is_vision
)
temperature = payload.temperature if payload.temperature is not None else 0.6
top_p = payload.top_p if payload.top_p is not None else 0.95
top_k = payload.top_k if payload.top_k is not None else 20
min_p = payload.min_p if payload.min_p is not None else 0.01
repetition_penalty = (
payload.repetition_penalty if payload.repetition_penalty is not None else 1.0
)
presence_penalty = (
payload.presence_penalty if payload.presence_penalty is not None else 0.0
)
stop = payload.stop_sequences or None
# Translate Anthropic tool_choice to OpenAI format for forwarding to
# llama-server. Falls back to "auto" when unset or unrecognized, which
# matches the prior hardcoded behavior.
openai_tool_choice = anthropic_tool_choice_to_openai(payload.tool_choice)
if openai_tool_choice is None:
openai_tool_choice = "auto"
cancel_event = threading.Event()
# ── Tool routing ──────────────────────────────────────────
# Three paths:
# 1. enable_tools=true → server-side execution of built-in tools (Unsloth shorthand)
# 2. tools=[...] only → client-side pass-through (standard Anthropic behavior)
# 3. neither → plain chat
# Server-side agentic loop doesn't support multimodal input — matches
# the `not image_b64` gate in /v1/chat/completions.
requested_studio_tools = _anthropic_requested_studio_tools(payload.tools)
# Reject malformed client tools at the boundary. AnthropicTool was
# relaxed to Optional[name]/Optional[input_schema] for server tools,
# so the converter silently drops incomplete entries — surface them
# as 400. A `type` field marks a server-tool declaration per spec
# (unrecognized server tools are accepted as no-ops); anything else
# without input_schema or name is malformed and must not be allowed
# to silently flip execution mode or disable tool calling.
for tool in payload.tools or []:
td = tool if isinstance(tool, dict) else tool.model_dump()
name, type_, schema = td.get("name"), td.get("type"), td.get("input_schema")
if schema is None and not isinstance(type_, str):
raise HTTPException(
status_code = 400,
detail = f"Tool {name!r} is missing required field 'input_schema'.",
)
if schema is not None and (not isinstance(name, str) or not name):
raise HTTPException(
status_code = 400,
detail = "Client tool is missing required field 'name'.",
)
# Detect client tools from the raw payload (presence of input_schema)
# so the mixed-mode check below isn't fooled by a name collision with
# a server-tool alias that the post-filter would silently drop.
_has_client_tool = any(
(t if isinstance(t, dict) else t.model_dump()).get("input_schema") is not None
for t in payload.tools or []
)
# The server-tool agentic loop executes tools in-process and cannot
# relay unknown client functions back to the caller, so mixed requests
# would silently drop the client tools. Reject explicitly instead.
if requested_studio_tools and _has_client_tool:
raise HTTPException(
status_code = 400,
detail = (
"Mixing Anthropic server tools (e.g. web_search_20250305) "
"with custom client tools in a single request is not "
"supported. Send them in separate requests."
),
)
openai_client_tools = [
tool
for tool in anthropic_tools_to_openai(payload.tools or [])
if tool.get("function", {}).get("name") not in requested_studio_tools
]
# An Anthropic server-tool declaration implies server-tool mode, but
# only when tools aren't explicitly disabled (CLI --disable-tools or
# per-request enable_tools=false). Explicit False always wins.
_enable = _effective_enable_tools(payload)
server_tools = (
(_enable or (_enable is None and bool(requested_studio_tools)))
and llama_backend.supports_tools
and not _has_image
)
client_tools = (
not server_tools
and len(openai_client_tools) > 0
and llama_backend.supports_tools
)
# ── Client-side pass-through path ─────────────────────────
if client_tools:
openai_tools = openai_client_tools
if payload.stream:
return await _anthropic_passthrough_stream(
request,
cancel_event,
llama_backend,
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
payload.max_tokens,
message_id,
model_name,
stop = stop,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
tool_choice = openai_tool_choice,
session_id = payload.session_id,
cancel_id = payload.cancel_id,
)
return await _anthropic_passthrough_non_streaming(
llama_backend,
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
payload.max_tokens,
message_id,
model_name,
stop = stop,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
tool_choice = openai_tool_choice,
)
if server_tools:
from core.inference.tools import ALL_TOOLS
openai_tools = _select_anthropic_server_tools(
ALL_TOOLS,
requested_studio_tools,
payload.enabled_tools,
)
# Build tool-use system prompt nudge (same logic as /chat/completions)
_tool_names = {t["function"]["name"] for t in openai_tools}
_has_web = "web_search" in _tool_names
_has_code = "python" in _tool_names or "terminal" in _tool_names
_date_line = f"The current date is {_date.today().isoformat()}."
_model_size_b = _extract_model_size_b(model_name)
_is_small_model = _model_size_b is not None and _model_size_b < 9
if _is_small_model:
_web_tips = "Do not repeat the same search query."
else:
_web_tips = (
"When you search and find a relevant URL in the results, "
"fetch its full content by calling web_search with the url parameter. "
"Do not repeat the same search query. If a search returns "
"no useful results, try rephrasing or fetching a result URL directly."
)
_code_tips = (
"Use code execution for math, calculations, data processing, "
"or to parse and analyze information from tool results."
)
if _has_web and _has_code:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"tools rather than answering from memory. "
+ _web_tips
+ " "
+ _code_tips
)
elif _has_code:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"code execution rather than answering from memory. " + _code_tips
)
elif _has_web:
_nudge = (
_date_line + " "
"You have access to tools. When appropriate, prefer using "
"web search for up-to-date or uncertain factual "
"information rather than answering from memory. " + _web_tips
)
else:
_nudge = ""
if _nudge:
_nudge += _TOOL_ACTION_NUDGE
# Inject into system prompt
if openai_messages and openai_messages[0].get("role") == "system":
openai_messages[0]["content"] = (
openai_messages[0]["content"].rstrip() + "\n\n" + _nudge
)
else:
openai_messages.insert(0, {"role": "system", "content": _nudge})
# Strip stale tool-call XML from conversation
for _msg in openai_messages:
if _msg.get("role") == "assistant" and isinstance(_msg.get("content"), str):
_msg["content"] = _TOOL_XML_RE.sub("", _msg["content"]).strip()
def _run_tool_gen():
return llama_backend.generate_chat_completion_with_tools(
messages = openai_messages,
tools = openai_tools,
temperature = temperature,
top_p = top_p,
top_k = top_k,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
max_tokens = payload.max_tokens,
stop = stop,
cancel_event = cancel_event,
max_tool_iterations = 25,
auto_heal_tool_calls = True,
tool_call_timeout = 300,
session_id = payload.session_id,
)
if payload.stream:
return await _anthropic_tool_stream(
request,
cancel_event,
_run_tool_gen,
message_id,
model_name,
)
return await _anthropic_tool_non_streaming(
_run_tool_gen,
message_id,
model_name,
)
# ── No-tool path ──────────────────────────────────────────
def _run_plain_gen():
return llama_backend.generate_chat_completion(
messages = openai_messages,
temperature = temperature,
top_p = top_p,
top_k = top_k,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
max_tokens = payload.max_tokens,
stop = stop,
cancel_event = cancel_event,
)
if payload.stream:
return await _anthropic_plain_stream(
request,
cancel_event,
_run_plain_gen,
message_id,
model_name,
)
return await _anthropic_plain_non_streaming(
_run_plain_gen,
message_id,
model_name,
)
async def _anthropic_tool_stream(
request,
cancel_event,
run_gen,
message_id,
model_name,
):
"""Streaming response for the tool-calling path."""
_sentinel = object()
async def _stream():
emitter = AnthropicStreamEmitter()
for line in emitter.start(message_id, model_name):
yield line
gen = run_gen()
try:
while True:
if await request.is_disconnected():
cancel_event.set()
return
event = await asyncio.to_thread(next, gen, _sentinel)
if event is _sentinel:
break
# Strip leaked tool-call XML from content events
if event.get("type") == "content":
event = dict(event)
event["text"] = _TOOL_XML_RE.sub("", event["text"])
for line in emitter.feed(event):
yield line
except Exception as e:
logger.error("anthropic_messages stream error: %s", e)
for line in emitter.finish("end_turn"):
yield line
return StreamingResponse(
_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
async def _anthropic_plain_stream(
request,
cancel_event,
run_gen,
message_id,
model_name,
):
"""Streaming response for the no-tool path."""
_sentinel = object()
async def _stream():
emitter = AnthropicStreamEmitter()
for line in emitter.start(message_id, model_name):
yield line
gen = run_gen()
try:
while True:
if await request.is_disconnected():
cancel_event.set()
return
cumulative = await asyncio.to_thread(next, gen, _sentinel)
if cumulative is _sentinel:
break
if isinstance(cumulative, dict):
if cumulative.get("type") == "metadata":
for line in emitter.feed(cumulative):
yield line
continue
# Plain generator yields cumulative text strings
for line in emitter.feed({"type": "content", "text": cumulative}):
yield line
except Exception as e:
logger.error("anthropic_messages stream error: %s", e)
for line in emitter.finish("end_turn"):
yield line
return StreamingResponse(
_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
async def _anthropic_tool_non_streaming(run_gen, message_id, model_name):
"""Non-streaming response for the tool-calling path.
Builds ``content_blocks`` in generation order (text → tool_use → text →
tool_use → ...), mirroring the streaming emitter's behavior. Deltas
within a single synthesis turn are merged into the trailing text block;
tool_use blocks interrupt the text sequence and open a new text block on
the next content event.
``prev_text`` is reset on ``tool_end`` because
``generate_chat_completion_with_tools`` yields cumulative content *per
turn* — the first content event of turn N+1 must diff against an empty
baseline, not against turn N's final length.
"""
content_blocks: list = []
usage = {}
prev_text = ""
for event in run_gen():
etype = event.get("type", "")
if etype == "content":
# Strip leaked tool-call XML
clean = _TOOL_XML_RE.sub("", event["text"])
new = clean[len(prev_text) :]
prev_text = clean
if new:
if content_blocks and isinstance(
content_blocks[-1], AnthropicResponseTextBlock
):
content_blocks[-1].text += new
else:
content_blocks.append(AnthropicResponseTextBlock(text = new))
elif etype == "tool_start":
content_blocks.append(
AnthropicResponseToolUseBlock(
id = event["tool_call_id"],
name = event["tool_name"],
input = event.get("arguments", {}),
)
)
elif etype == "tool_end":
prev_text = ""
elif etype == "metadata":
usage = event.get("usage", {})
resp = AnthropicMessagesResponse(
id = message_id,
model = model_name,
content = content_blocks,
stop_reason = "end_turn",
usage = AnthropicUsage(
input_tokens = usage.get("prompt_tokens", 0),
output_tokens = usage.get("completion_tokens", 0),
),
)
return JSONResponse(content = resp.model_dump())
async def _anthropic_plain_non_streaming(run_gen, message_id, model_name):
"""Non-streaming response for the no-tool path."""
text_parts = []
usage = {}
prev_text = ""
for cumulative in run_gen():
if isinstance(cumulative, dict):
if cumulative.get("type") == "metadata":
usage = cumulative.get("usage", {})
continue
new = cumulative[len(prev_text) :]
prev_text = cumulative
if new:
text_parts.append(new)
full_text = "".join(text_parts)
content_blocks = []
if full_text:
content_blocks.append(AnthropicResponseTextBlock(text = full_text))
resp = AnthropicMessagesResponse(
id = message_id,
model = model_name,
content = content_blocks,
stop_reason = "end_turn",
usage = AnthropicUsage(
input_tokens = usage.get("prompt_tokens", 0),
output_tokens = usage.get("completion_tokens", 0),
),
)
return JSONResponse(content = resp.model_dump())
# =====================================================================
# Client-side tool pass-through (Anthropic-native tools field)
# =====================================================================
def _build_passthrough_payload(
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
max_tokens,
stream,
stop = None,
min_p = None,
repetition_penalty = None,
presence_penalty = None,
tool_choice = "auto",
response_format = None,
chat_template_kwargs = None,
backend_ctx = None,
):
body = {
"messages": openai_messages,
"tools": openai_tools,
"tool_choice": tool_choice,
"temperature": temperature,
"top_p": top_p,
"top_k": top_k,
"stream": stream,
}
if stream:
body["stream_options"] = {"include_usage": True}
body["max_tokens"] = (
max_tokens
if max_tokens is not None
else (backend_ctx or _DEFAULT_MAX_TOKENS_FLOOR)
)
body["t_max_predict_ms"] = _DEFAULT_T_MAX_PREDICT_MS
if stop:
body["stop"] = stop
if min_p is not None:
body["min_p"] = min_p
if repetition_penalty is not None:
# llama-server's field is "repeat_penalty", not "repetition_penalty"
body["repeat_penalty"] = repetition_penalty
if presence_penalty is not None:
body["presence_penalty"] = presence_penalty
if response_format is not None:
# llama-server applies a GBNF grammar derived from the JSON schema
# when response_format is present. Field is documented flat at the
# request root (tools/server/README.md), which is also what the
# OpenAI SDK produces by spreading extra_body into the body top.
body["response_format"] = response_format
if chat_template_kwargs is not None:
# Propagate reasoning / template overrides (e.g. enable_thinking)
# so llama-server renders the Jinja template in the mode the caller
# asked for instead of whatever default the model was loaded with.
body["chat_template_kwargs"] = chat_template_kwargs
return body
async def _anthropic_passthrough_stream(
request,
cancel_event,
llama_backend,
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
max_tokens,
message_id,
model_name,
stop = None,
min_p = None,
repetition_penalty = None,
presence_penalty = None,
tool_choice = "auto",
session_id = None,
cancel_id = None,
):
"""Streaming client-side pass-through: forward tools to llama-server and
translate its streaming response to Anthropic SSE without executing anything."""
target_url = f"{llama_backend.base_url}/v1/chat/completions"
body = _build_passthrough_payload(
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
max_tokens,
True,
stop = stop,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
tool_choice = tool_choice,
backend_ctx = llama_backend.context_length,
)
# cancel_id mirrors the OpenAI passthrough so a per-run cancel POST
# works without the caller having to know the local message_id.
_tracker = _TrackedCancel(cancel_event, cancel_id, session_id, message_id)
_tracker.__enter__()
async def _stream():
emitter = AnthropicPassthroughEmitter()
for line in emitter.start(message_id, model_name):
yield line
# Manage the httpx client, response, AND the aiter_lines() async
# generator MANUALLY — no `async with`, no anonymous iterator.
#
# On Python 3.13 + httpcore 1.0.x, `async for raw_line in
# resp.aiter_lines():` creates an anonymous async generator. When
# the loop exits via `break` (or the generator is orphaned when a
# client disconnects mid-stream), Python's `async for` protocol
# does NOT auto-close the iterator the way a sync `for` loop
# would. The iterator remains reachable only from the current
# coroutine frame; once `_stream()` returns, the frame is GC'd
# and the iterator becomes unreachable. Python's asyncgen
# finalizer hook then runs its aclose() on a LATER GC pass in a
# DIFFERENT asyncio task, where httpcore's
# `HTTP11ConnectionByteStream.aclose()` enters
# `anyio.CancelScope.__exit__` with a mismatched task and prints
# `RuntimeError: Attempted to exit cancel scope in a different
# task` / `RuntimeError: async generator ignored GeneratorExit`
# as "Exception ignored in:" unraisable warnings.
#
# The fix: save `resp.aiter_lines()` as `lines_iter`, and in the
# finally block explicitly `await lines_iter.aclose()` BEFORE
# `resp.aclose()` / `client.aclose()`. This closes the iterator
# inside our own task's event loop, so the internal httpcore
# byte-stream is cleaned up before Python's asyncgen finalizer
# has anything orphaned to finalize. Each aclose is wrapped in
# `try: ... except Exception: pass` so anyio cleanup noise from
# nested aclose paths can't bubble out.
client = httpx.AsyncClient(
timeout = 600,
limits = httpx.Limits(max_keepalive_connections = 0),
)
resp = None
lines_iter = None
cancel_watcher = None
try:
req = client.build_request("POST", target_url, json = body)
resp = await client.send(req, stream = True)
# See _openai_passthrough_stream for rationale: aiter_lines()
# blocks during llama-server prefill, so the in-loop cancel
# check is unreachable until the first SSE chunk arrives.
# The watcher closes `resp` on cancel, raising in aiter_lines.
cancel_watcher = asyncio.create_task(
_await_cancel_then_close(cancel_event, resp)
)
lines_iter = resp.aiter_lines()
async for raw_line in lines_iter:
if cancel_event.is_set():
break
if await request.is_disconnected():
cancel_event.set()
break
if not raw_line or not raw_line.startswith("data: "):
continue
data_str = raw_line[6:]
if data_str.strip() == "[DONE]":
break
try:
chunk = json.loads(data_str)
except json.JSONDecodeError:
continue
for line in emitter.feed_chunk(chunk):
yield line
except (httpx.RemoteProtocolError, httpx.ReadError, httpx.CloseError):
if not cancel_event.is_set():
raise
except Exception as e:
logger.error("anthropic_messages passthrough stream error: %s", e)
finally:
if cancel_watcher is not None:
cancel_watcher.cancel()
try:
await cancel_watcher
except (asyncio.CancelledError, Exception):
pass
if lines_iter is not None:
try:
await lines_iter.aclose()
except Exception:
pass
if resp is not None:
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
_tracker.__exit__(None, None, None)
for line in emitter.finish():
yield line
return StreamingResponse(
_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
async def _anthropic_passthrough_non_streaming(
llama_backend,
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
max_tokens,
message_id,
model_name,
stop = None,
min_p = None,
repetition_penalty = None,
presence_penalty = None,
tool_choice = "auto",
):
"""Non-streaming client-side pass-through."""
target_url = f"{llama_backend.base_url}/v1/chat/completions"
body = _build_passthrough_payload(
openai_messages,
openai_tools,
temperature,
top_p,
top_k,
max_tokens,
False,
stop = stop,
min_p = min_p,
repetition_penalty = repetition_penalty,
presence_penalty = presence_penalty,
tool_choice = tool_choice,
backend_ctx = llama_backend.context_length,
)
async with httpx.AsyncClient() as client:
resp = await client.post(target_url, json = body, timeout = 600)
if resp.status_code != 200:
raise HTTPException(
status_code = resp.status_code,
detail = f"llama-server error: {resp.text[:500]}",
)
data = resp.json()
choice = (data.get("choices") or [{}])[0]
message = choice.get("message") or {}
finish_reason = choice.get("finish_reason")
content_blocks = []
text = message.get("content") or ""
if text:
text = _TOOL_XML_RE.sub("", text).strip()
if text:
content_blocks.append(AnthropicResponseTextBlock(text = text))
tool_calls = message.get("tool_calls") or []
for tc in tool_calls:
fn = tc.get("function") or {}
try:
args = json.loads(fn.get("arguments", "{}"))
except json.JSONDecodeError:
args = {}
content_blocks.append(
AnthropicResponseToolUseBlock(
id = tc.get("id", ""),
name = fn.get("name", ""),
input = args,
)
)
if tool_calls:
stop_reason = "tool_use"
elif finish_reason == "length":
stop_reason = "max_tokens"
else:
stop_reason = "end_turn"
usage = data.get("usage") or {}
resp_obj = AnthropicMessagesResponse(
id = message_id,
model = model_name,
content = content_blocks,
stop_reason = stop_reason,
usage = AnthropicUsage(
input_tokens = usage.get("prompt_tokens", 0),
output_tokens = usage.get("completion_tokens", 0),
),
)
return JSONResponse(content = resp_obj.model_dump())
# =====================================================================
# Client-side tool pass-through (OpenAI-native /v1/chat/completions)
# =====================================================================
def _drop_empty_assistant_sentinels(messages: list[dict]) -> list[dict]:
"""Drop bare ``{"role":"assistant"}`` Stop-button sentinels; passthrough backends reject them."""
out: list[dict] = []
for m in messages:
if m.get("role") == "assistant":
has_content = bool(m.get("content"))
has_tool_calls = bool(m.get("tool_calls"))
if not has_content and not has_tool_calls:
continue
out.append(m)
return out
def _openai_messages_for_passthrough(payload) -> list[dict]:
"""Build OpenAI-format message dicts for the /v1/chat/completions
passthrough path.
Messages from ``payload.messages`` are dumped through Pydantic (dropping
unset optional fields) so they are already in standard OpenAI format
— including ``role="tool"`` tool-result messages and assistant messages
that carry structured ``tool_calls``. Content-parts images already in
the message list are left untouched.
When a client uses Studio's legacy ``image_base64`` top-level field, the
image is re-encoded to PNG (llama-server's stb_image has limited format
support) and spliced into the last user message as an OpenAI
``image_url`` content part so vision + function-calling requests work
transparently.
"""
messages = _drop_empty_assistant_sentinels(
[m.model_dump(exclude_none = True) for m in payload.messages]
)
if not payload.image_base64:
return messages
try:
import base64 as _b64
from io import BytesIO as _BytesIO
from PIL import Image as _Image
raw = _b64.b64decode(payload.image_base64)
img = _Image.open(_BytesIO(raw)).convert("RGB")
buf = _BytesIO()
img.save(buf, format = "PNG")
png_b64 = _b64.b64encode(buf.getvalue()).decode("ascii")
except Exception:
raise HTTPException(
status_code = 400,
detail = "Failed to process image.",
)
data_url = f"data:image/png;base64,{png_b64}"
image_part = {"type": "image_url", "image_url": {"url": data_url}}
for msg in reversed(messages):
if msg.get("role") != "user":
continue
existing = msg.get("content")
if isinstance(existing, str):
msg["content"] = [{"type": "text", "text": existing}, image_part]
elif isinstance(existing, list):
existing.append(image_part)
else:
msg["content"] = [image_part]
break
else:
messages.append({"role": "user", "content": [image_part]})
return messages
def _openai_messages_for_gguf_chat(payload, is_vision: bool) -> tuple[list[dict], bool]:
"""Build llama-server messages for the standard GGUF chat path.
llama-server accepts OpenAI multimodal content parts directly. Preserve
all per-turn ``image_url`` parts so multi-image chat history keeps each
image attached to its original turn.
"""
messages = _drop_empty_assistant_sentinels(
[m.model_dump(exclude_none = True) for m in payload.messages]
)
has_message_image = any(
isinstance(msg.get("content"), list)
and any(part.get("type") == "image_url" for part in msg["content"])
for msg in messages
)
if payload.image_base64 and not has_message_image:
# Legacy bytes can be any format; the normalizer below sniffs and
# re-encodes to PNG, so the declared mime is rewritten anyway.
image_part = {
"type": "image_url",
"image_url": {
"url": f"data:image/png;base64,{payload.image_base64}",
},
}
for msg in reversed(messages):
if msg.get("role") != "user":
continue
existing = msg.get("content")
if isinstance(existing, str):
msg["content"] = [{"type": "text", "text": existing}, image_part]
elif isinstance(existing, list):
existing.append(image_part)
else:
msg["content"] = [image_part]
break
else:
messages.append({"role": "user", "content": [image_part]})
has_image = _normalize_anthropic_openai_images(messages, is_vision)
return messages, has_image
def _extract_response_format(payload):
"""Return the ``response_format`` field on an incoming ChatCompletionRequest
(or None). The model is declared with ``extra="allow"`` so pydantic stashes
unknown top-level fields in ``model_extra``; OpenAI-SDK clients spread
``extra_body`` into the request body top level, which is where guided-
decoding recipes park their JSON-schema response_format.
"""
extra = getattr(payload, "model_extra", None)
if not isinstance(extra, dict):
return None
rf = extra.get("response_format")
return rf if isinstance(rf, dict) else None
def _build_openai_passthrough_body(payload, backend_ctx = None) -> dict:
"""Assemble the llama-server request body from a ChatCompletionRequest.
Only explicitly-known OpenAI / llama-server fields are forwarded so that
Studio-specific extensions (``enable_tools``, ``enabled_tools``,
``session_id``, ...) never leak to the backend.
"""
messages = _openai_messages_for_passthrough(payload)
tool_choice = payload.tool_choice if payload.tool_choice is not None else "auto"
# When the caller asked for a specific reasoning mode, forward it to
# llama-server via chat_template_kwargs so the Jinja template renders
# with (or without) the reasoning preamble.
tpl_kwargs = None
if payload.enable_thinking is not None:
tpl_kwargs = {"enable_thinking": bool(payload.enable_thinking)}
return _build_passthrough_payload(
messages,
payload.tools,
payload.temperature,
payload.top_p,
payload.top_k,
payload.max_tokens,
payload.stream,
stop = payload.stop,
min_p = payload.min_p,
repetition_penalty = payload.repetition_penalty,
presence_penalty = payload.presence_penalty,
tool_choice = tool_choice,
response_format = _extract_response_format(payload),
chat_template_kwargs = tpl_kwargs,
backend_ctx = backend_ctx,
)
async def _openai_passthrough_stream(
request,
cancel_event,
llama_backend,
payload,
model_name,
completion_id,
):
"""Streaming client-side pass-through for /v1/chat/completions.
Forwards the client's OpenAI function-calling request to llama-server and
relays the SSE stream back verbatim. This preserves llama-server's
native response ``id``, ``finish_reason`` (including ``"tool_calls"``),
``delta.tool_calls``, and the trailing ``usage`` chunk so the client
observes a standard OpenAI response.
"""
target_url = f"{llama_backend.base_url}/v1/chat/completions"
body = _build_openai_passthrough_body(
payload, backend_ctx = llama_backend.context_length
)
_cancel_keys = (payload.cancel_id, payload.session_id, completion_id)
_tracker = _TrackedCancel(cancel_event, *_cancel_keys)
_tracker.__enter__()
# Outer guard: asyncio.CancelledError at `await client.send(...)` is
# a BaseException that bypasses `except httpx.RequestError`; without
# this the tracker leaks. The generator's finally only runs once
# iteration starts.
try:
# Dispatch BEFORE returning StreamingResponse so transport errors
# and non-200 upstream statuses surface as real HTTP errors --
# OpenAI SDKs rely on status codes to raise APIError/BadRequestError.
client = httpx.AsyncClient(
timeout = 600,
limits = httpx.Limits(max_keepalive_connections = 0),
)
resp = None
try:
req = client.build_request("POST", target_url, json = body)
resp = await client.send(req, stream = True)
except httpx.RequestError as e:
# llama-server subprocess crashed / still starting / unreachable.
logger.error("openai passthrough stream: upstream unreachable: %s", e)
if resp is not None:
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
raise HTTPException(
status_code = 502,
detail = _friendly_error(e),
)
if resp.status_code != 200:
err_bytes = await resp.aread()
err_text = err_bytes.decode("utf-8", errors = "replace")
logger.error(
"openai passthrough upstream error: status=%s body=%s",
resp.status_code,
err_text[:500],
)
upstream_status = resp.status_code
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
raise HTTPException(
status_code = upstream_status,
detail = f"llama-server error: {err_text[:500]}",
)
async def _stream():
# Same httpx lifecycle pattern as _anthropic_passthrough_stream:
# save resp.aiter_lines() so the finally block can aclose() it
# on our task. See that function for full rationale.
lines_iter = None
# During llama-server prefill, `aiter_lines()` blocks until the
# first SSE chunk arrives. The in-loop `cancel_event` check
# cannot fire until then, which is the exact proxy/Colab
# scenario the cancel POST is meant to recover from. Run a
# tiny watcher that closes `resp` as soon as cancel fires,
# unblocking the iterator with a RemoteProtocolError caught
# in the except clause below.
cancel_watcher = asyncio.create_task(
_await_cancel_then_close(cancel_event, resp)
)
try:
lines_iter = resp.aiter_lines()
async for raw_line in lines_iter:
if cancel_event.is_set():
break
if await request.is_disconnected():
cancel_event.set()
break
if not raw_line:
continue
if not raw_line.startswith("data: "):
continue
# Relay verbatim to preserve llama-server's native id,
# finish_reason, delta.tool_calls, and usage chunks.
yield raw_line + "\n\n"
if raw_line[6:].strip() == "[DONE]":
break
except (httpx.RemoteProtocolError, httpx.ReadError, httpx.CloseError):
# Watcher closed resp on cancel. Emit nothing extra; the
# client either initiated the cancel or already disconnected.
if not cancel_event.is_set():
raise
except Exception as e:
# 200 headers are already flushed; errors must be in the SSE body.
logger.error("openai passthrough stream error: %s", e)
err = {
"error": {
"message": _friendly_error(e),
"type": "server_error",
},
}
yield f"data: {json.dumps(err)}\n\n"
finally:
cancel_watcher.cancel()
try:
await cancel_watcher
except (asyncio.CancelledError, Exception):
pass
if lines_iter is not None:
try:
await lines_iter.aclose()
except Exception:
pass
try:
await resp.aclose()
except Exception:
pass
try:
await client.aclose()
except Exception:
pass
_tracker.__exit__(None, None, None)
return StreamingResponse(
_stream(),
media_type = "text/event-stream",
headers = {
"Cache-Control": "no-cache",
"Connection": "keep-alive",
"X-Accel-Buffering": "no",
},
)
except BaseException:
_tracker.__exit__(None, None, None)
raise
async def _openai_passthrough_non_streaming(
llama_backend,
payload,
model_name,
):
"""Non-streaming client-side pass-through for /v1/chat/completions.
Returns llama-server's JSON response verbatim (via JSONResponse) so the
client sees the native response ``id``, ``finish_reason`` (including
``"tool_calls"``), structured ``tool_calls``, and accurate ``usage``
token counts.
"""
target_url = f"{llama_backend.base_url}/v1/chat/completions"
body = _build_openai_passthrough_body(
payload, backend_ctx = llama_backend.context_length
)
try:
async with httpx.AsyncClient() as client:
resp = await client.post(target_url, json = body, timeout = 600)
except httpx.RequestError as e:
# llama-server subprocess crashed / still starting / unreachable.
# Surface the same friendly message the sync chat path emits so
# operators don't see a bare 500 with no diagnostic.
logger.error("openai passthrough non-streaming: upstream unreachable: %s", e)
raise HTTPException(
status_code = 502,
detail = _friendly_error(e),
)
if resp.status_code != 200:
raise HTTPException(
status_code = resp.status_code,
detail = f"llama-server error: {resp.text[:500]}",
)
# Guided-decoding fence wrap. llama-server returns raw JSON that matches
# the schema (no surrounding markdown) because the GBNF grammar only
# emits the JSON object itself. data_designer's llm-structured parser
# looks for a ```json ... ``` markdown fence and discards unfenced
# output, which collapses a 100%-valid guided-decoding run to 0/N.
# Wrap each choice's content in the expected fence when the caller
# asked for guided decoding, leaving already-fenced content alone.
if _extract_response_format(payload) is not None:
try:
data = resp.json()
changed = False
for choice in data.get("choices", []):
if not isinstance(choice, dict):
continue
msg = choice.get("message")
if not isinstance(msg, dict):
continue
content = msg.get("content")
if not isinstance(content, str):
continue
stripped = content.strip()
if not stripped or stripped.startswith("```"):
continue
msg["content"] = f"```json\n{stripped}\n```"
changed = True
if changed:
return JSONResponse(content = data)
except Exception as exc:
# Wrap is best-effort; fall through to the verbatim body if
# the response is not JSON-shaped or the structure is unusual.
logger.warning(
"response_format fence wrap skipped: %s",
exc,
)
# Pass the upstream body through as raw bytes — skips a redundant
# parse+re-serialize round-trip and keeps the response truly
# verbatim (matches the docstring). Status is guaranteed 200 by
# the check above.
return Response(content = resp.content, media_type = "application/json")
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