740 lines
20 KiB
TypeScript
740 lines
20 KiB
TypeScript
import path from "path"
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import { App } from "../app/app"
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import { Identifier } from "../id/id"
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import { Storage } from "../storage/storage"
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import { Log } from "../util/log"
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import {
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convertToModelMessages,
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generateText,
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LoadAPIKeyError,
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stepCountIs,
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streamText,
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tool,
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type Tool as AITool,
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type LanguageModelUsage,
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} from "ai"
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import { z, ZodSchema } from "zod"
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import { Decimal } from "decimal.js"
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import PROMPT_ANTHROPIC from "./prompt/anthropic.txt"
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import PROMPT_ANTHROPIC_SPOOF from "./prompt/anthropic_spoof.txt"
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import PROMPT_TITLE from "./prompt/title.txt"
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import PROMPT_SUMMARIZE from "./prompt/summarize.txt"
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import PROMPT_INITIALIZE from "../session/prompt/initialize.txt"
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import { Share } from "../share/share"
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import { Message } from "./message"
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import { Bus } from "../bus"
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import { Provider } from "../provider/provider"
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import { SessionContext } from "./context"
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import { ListTool } from "../tool/ls"
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import { MCP } from "../mcp"
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import { NamedError } from "../util/error"
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export namespace Session {
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const log = Log.create({ service: "session" })
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export const Info = z
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.object({
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id: Identifier.schema("session"),
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share: z
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.object({
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secret: z.string(),
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url: z.string(),
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})
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.optional(),
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title: z.string(),
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time: z.object({
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created: z.number(),
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updated: z.number(),
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}),
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})
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.openapi({
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ref: "session.info",
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})
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export type Info = z.output<typeof Info>
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export const Event = {
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Updated: Bus.event(
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"session.updated",
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z.object({
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info: Info,
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}),
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),
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Error: Bus.event(
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"session.error",
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z.object({
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error: Message.Info.shape.metadata.shape.error,
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}),
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),
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}
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const state = App.state("session", () => {
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const sessions = new Map<string, Info>()
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const messages = new Map<string, Message.Info[]>()
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return {
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sessions,
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messages,
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}
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})
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export async function create() {
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const result: Info = {
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id: Identifier.descending("session"),
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title: "New Session - " + new Date().toISOString(),
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time: {
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created: Date.now(),
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updated: Date.now(),
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},
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}
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log.info("created", result)
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state().sessions.set(result.id, result)
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await Storage.writeJSON("session/info/" + result.id, result)
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share(result.id).then((share) => {
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update(result.id, (draft) => {
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draft.share = share
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})
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})
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Bus.publish(Event.Updated, {
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info: result,
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})
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return result
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}
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export async function get(id: string) {
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const result = state().sessions.get(id)
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if (result) {
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return result
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}
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const read = await Storage.readJSON<Info>("session/info/" + id)
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state().sessions.set(id, read)
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return read as Info
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}
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export async function share(id: string) {
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const session = await get(id)
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if (session.share) return session.share
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const share = await Share.create(id)
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await update(id, (draft) => {
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draft.share = share
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})
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for (const msg of await messages(id)) {
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await Share.sync("session/message/" + id + "/" + msg.id, msg)
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}
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return share
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}
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export async function update(id: string, editor: (session: Info) => void) {
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const { sessions } = state()
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const session = await get(id)
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if (!session) return
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editor(session)
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session.time.updated = Date.now()
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sessions.set(id, session)
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await Storage.writeJSON("session/info/" + id, session)
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Bus.publish(Event.Updated, {
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info: session,
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})
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return session
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}
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export async function messages(sessionID: string) {
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const result = [] as Message.Info[]
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const list = Storage.list("session/message/" + sessionID)
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for await (const p of list) {
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const read = await Storage.readJSON<Message.Info>(p)
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result.push(read)
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}
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result.sort((a, b) => (a.id > b.id ? 1 : -1))
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return result
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}
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export async function getMessage(sessionID: string, messageID: string) {
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return Storage.readJSON<Message.Info>(
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"session/message/" + sessionID + "/" + messageID,
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)
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}
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export async function* list() {
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for await (const item of Storage.list("session/info")) {
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const sessionID = path.basename(item, ".json")
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yield get(sessionID)
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}
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}
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export function abort(sessionID: string) {
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const controller = pending.get(sessionID)
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if (!controller) return false
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controller.abort()
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pending.delete(sessionID)
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return true
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}
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async function updateMessage(msg: Message.Info) {
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await Storage.writeJSON(
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"session/message/" + msg.metadata.sessionID + "/" + msg.id,
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msg,
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)
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Bus.publish(Message.Event.Updated, {
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info: msg,
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})
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}
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export async function chat(input: {
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sessionID: string
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providerID: string
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modelID: string
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parts: Message.Part[]
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}) {
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const l = log.clone().tag("session", input.sessionID)
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l.info("chatting")
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const model = await Provider.getModel(input.providerID, input.modelID)
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let msgs = await messages(input.sessionID)
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const previous = msgs.at(-1)
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if (previous?.metadata.assistant) {
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const tokens =
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previous.metadata.assistant.tokens.input +
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previous.metadata.assistant.tokens.output
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if (
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tokens >
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(model.info.limit.context - (model.info.limit.output ?? 0)) * 0.9
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) {
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await summarize({
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sessionID: input.sessionID,
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providerID: input.providerID,
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modelID: input.modelID,
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})
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return chat(input)
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}
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}
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using abort = lock(input.sessionID)
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const lastSummary = msgs.findLast(
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(msg) => msg.metadata.assistant?.summary === true,
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)
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if (lastSummary)
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msgs = msgs.filter(
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(msg) => msg.role === "system" || msg.id >= lastSummary.id,
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)
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if (msgs.length === 0) {
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const app = App.info()
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if (input.providerID === "anthropic") {
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const claude: Message.Info = {
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id: Identifier.ascending("message"),
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_ANTHROPIC_SPOOF.trim(),
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},
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],
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metadata: {
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sessionID: input.sessionID,
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time: {
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created: Date.now(),
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},
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tool: {},
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},
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}
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await updateMessage(claude)
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msgs.push(claude)
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}
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const system: Message.Info = {
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id: Identifier.ascending("message"),
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_ANTHROPIC,
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},
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{
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type: "text",
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text: [
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`Here is some useful information about the environment you are running in:`,
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`<env>`,
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`Working directory: ${app.path.cwd}`,
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`Is directory a git repo: ${app.git ? "yes" : "no"}`,
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`Platform: ${process.platform}`,
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`Today's date: ${new Date().toISOString()}`,
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`</env>`,
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`<project>`,
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`${app.git ? await ListTool.execute({ path: app.path.cwd, ignore: [] }, { sessionID: input.sessionID, abort: abort.signal }).then((x) => x.output) : ""}`,
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`</project>`,
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].join("\n"),
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},
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],
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metadata: {
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sessionID: input.sessionID,
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time: {
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created: Date.now(),
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},
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tool: {},
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},
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}
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const context = await SessionContext.find()
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if (context) {
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system.parts.push({
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type: "text",
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text: context,
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})
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}
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msgs.push(system)
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generateText({
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maxOutputTokens: 20,
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messages: convertToModelMessages([
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{
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_ANTHROPIC_SPOOF.trim(),
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},
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],
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},
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{
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_TITLE,
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},
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],
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},
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{
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role: "user",
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parts: input.parts,
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},
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]),
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temperature: 0,
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model: model.language,
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})
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.then((result) => {
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return Session.update(input.sessionID, (draft) => {
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draft.title = result.text
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})
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})
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.catch(() => {})
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await updateMessage(system)
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}
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const msg: Message.Info = {
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role: "user",
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id: Identifier.ascending("message"),
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parts: input.parts,
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metadata: {
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time: {
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created: Date.now(),
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},
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sessionID: input.sessionID,
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tool: {},
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},
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}
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await updateMessage(msg)
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msgs.push(msg)
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const next: Message.Info = {
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id: Identifier.ascending("message"),
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role: "assistant",
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parts: [],
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metadata: {
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assistant: {
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cost: 0,
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tokens: {
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input: 0,
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output: 0,
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reasoning: 0,
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},
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modelID: input.modelID,
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providerID: input.providerID,
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},
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time: {
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created: Date.now(),
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},
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sessionID: input.sessionID,
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tool: {},
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},
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}
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await updateMessage(next)
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const tools: Record<string, AITool> = {}
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for (const item of await Provider.tools(input.providerID)) {
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tools[item.id.replaceAll(".", "_")] = tool({
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id: item.id as any,
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description: item.description,
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parameters: item.parameters as ZodSchema,
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async execute(args, opts) {
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const start = Date.now()
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try {
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const result = await item.execute(args, {
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sessionID: input.sessionID,
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abort: abort.signal,
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})
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next.metadata!.tool![opts.toolCallId] = {
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...result.metadata,
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time: {
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start,
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end: Date.now(),
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},
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}
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await updateMessage(next)
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return result.output
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} catch (e: any) {
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next.metadata!.tool![opts.toolCallId] = {
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error: true,
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message: e.toString(),
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title: e.toString(),
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time: {
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start,
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end: Date.now(),
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},
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}
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await updateMessage(next)
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return e.toString()
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}
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},
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})
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}
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for (const [key, item] of Object.entries(await MCP.tools())) {
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const execute = item.execute
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if (!execute) continue
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item.execute = async (args, opts) => {
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const start = Date.now()
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try {
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const result = await execute(args, opts)
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next.metadata!.tool![opts.toolCallId] = {
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...result.metadata,
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time: {
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start,
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end: Date.now(),
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},
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}
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await updateMessage(next)
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return result.content
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.filter((x: any) => x.type === "text")
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.map((x: any) => x.text)
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.join("\n\n")
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} catch (e: any) {
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next.metadata!.tool![opts.toolCallId] = {
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error: true,
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message: e.toString(),
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title: "mcp",
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time: {
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start,
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end: Date.now(),
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},
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}
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await updateMessage(next)
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return e.toString()
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}
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}
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tools[key] = item
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}
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let text: Message.TextPart | undefined
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const result = streamText({
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onStepFinish: async (step) => {
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log.info("step finish", {
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finishReason: step.finishReason,
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})
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const assistant = next.metadata!.assistant!
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const usage = getUsage(step.usage, model.info)
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assistant.cost += usage.cost
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assistant.tokens = usage.tokens
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await updateMessage(next)
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if (text) {
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Bus.publish(Message.Event.PartUpdated, {
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part: text,
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messageID: next.id,
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sessionID: next.metadata.sessionID,
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})
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}
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text = undefined
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},
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async onChunk(input) {
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const value = input.chunk
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l.info("part", {
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type: value.type,
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})
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switch (value.type) {
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case "text":
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if (!text) {
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text = value
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next.parts.push(value)
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break
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} else text.text += value.text
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break
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case "tool-call": {
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const [match] = next.parts.flatMap((p) =>
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p.type === "tool-invocation" &&
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p.toolInvocation.toolCallId === value.toolCallId
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? [p]
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: [],
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)
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if (!match) break
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match.toolInvocation.args = value.args
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match.toolInvocation.state = "call"
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Bus.publish(Message.Event.PartUpdated, {
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part: match,
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messageID: next.id,
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sessionID: next.metadata.sessionID,
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})
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break
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}
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case "tool-call-streaming-start":
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next.parts.push({
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type: "tool-invocation",
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toolInvocation: {
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state: "partial-call",
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toolName: value.toolName,
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toolCallId: value.toolCallId,
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args: {},
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},
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})
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Bus.publish(Message.Event.PartUpdated, {
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part: next.parts[next.parts.length - 1],
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messageID: next.id,
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sessionID: next.metadata.sessionID,
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})
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break
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case "tool-call-delta":
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break
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case "tool-result":
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const match = next.parts.find(
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(p) =>
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p.type === "tool-invocation" &&
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p.toolInvocation.toolCallId === value.toolCallId,
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)
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if (match && match.type === "tool-invocation") {
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match.toolInvocation = {
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args: value.args,
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toolCallId: value.toolCallId,
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toolName: value.toolName,
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state: "result",
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result: value.result as string,
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}
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Bus.publish(Message.Event.PartUpdated, {
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part: match,
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messageID: next.id,
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sessionID: next.metadata.sessionID,
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})
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}
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break
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default:
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l.info("unhandled", {
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type: value.type,
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})
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}
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await updateMessage(next)
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},
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async onFinish(input) {
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const assistant = next.metadata!.assistant!
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const usage = getUsage(input.totalUsage, model.info)
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assistant.cost = usage.cost
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await updateMessage(next)
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},
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onError(err) {
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log.error("error", err)
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switch (true) {
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case LoadAPIKeyError.isInstance(err.error):
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next.metadata.error = new Provider.AuthError(
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{
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providerID: input.providerID,
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message: err.error.message,
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},
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{ cause: err.error },
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).toObject()
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break
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case err.error instanceof Error:
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next.metadata.error = new NamedError.Unknown(
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{ message: err.error.toString() },
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{ cause: err.error },
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).toObject()
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break
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default:
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next.metadata.error = new NamedError.Unknown(
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{ message: JSON.stringify(err.error) },
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{ cause: err.error },
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)
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}
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Bus.publish(Event.Error, {
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error: next.metadata.error,
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})
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},
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async prepareStep(step) {
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next.parts.push({
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type: "step-start",
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})
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await updateMessage(next)
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return step
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},
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toolCallStreaming: true,
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abortSignal: abort.signal,
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stopWhen: stepCountIs(1000),
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messages: convertToModelMessages(msgs),
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temperature: model.info.id === "codex-mini-latest" ? undefined : 0,
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tools: {
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...(await MCP.tools()),
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...tools,
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},
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model: model.language,
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})
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await result.consumeStream({
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|
onError: (err) => {
|
|
log.error("stream error", {
|
|
err,
|
|
})
|
|
},
|
|
})
|
|
next.metadata!.time.completed = Date.now()
|
|
for (const part of next.parts) {
|
|
if (
|
|
part.type === "tool-invocation" &&
|
|
part.toolInvocation.state !== "result"
|
|
) {
|
|
part.toolInvocation = {
|
|
...part.toolInvocation,
|
|
state: "result",
|
|
result: "request was aborted",
|
|
}
|
|
}
|
|
}
|
|
await updateMessage(next)
|
|
return next
|
|
}
|
|
|
|
export async function summarize(input: {
|
|
sessionID: string
|
|
providerID: string
|
|
modelID: string
|
|
}) {
|
|
using abort = lock(input.sessionID)
|
|
const msgs = await messages(input.sessionID)
|
|
const lastSummary = msgs.findLast(
|
|
(msg) => msg.metadata.assistant?.summary === true,
|
|
)?.id
|
|
const filtered = msgs.filter(
|
|
(msg) => msg.role !== "system" && (!lastSummary || msg.id >= lastSummary),
|
|
)
|
|
const model = await Provider.getModel(input.providerID, input.modelID)
|
|
const next: Message.Info = {
|
|
id: Identifier.ascending("message"),
|
|
role: "assistant",
|
|
parts: [],
|
|
metadata: {
|
|
tool: {},
|
|
sessionID: input.sessionID,
|
|
assistant: {
|
|
summary: true,
|
|
cost: 0,
|
|
modelID: input.modelID,
|
|
providerID: input.providerID,
|
|
tokens: {
|
|
input: 0,
|
|
output: 0,
|
|
reasoning: 0,
|
|
},
|
|
},
|
|
time: {
|
|
created: Date.now(),
|
|
},
|
|
},
|
|
}
|
|
await updateMessage(next)
|
|
const result = await generateText({
|
|
abortSignal: abort.signal,
|
|
model: model.language,
|
|
messages: convertToModelMessages([
|
|
{
|
|
role: "system",
|
|
parts: [
|
|
{
|
|
type: "text",
|
|
text: PROMPT_SUMMARIZE,
|
|
},
|
|
],
|
|
},
|
|
...filtered,
|
|
{
|
|
role: "user",
|
|
parts: [
|
|
{
|
|
type: "text",
|
|
text: "Provide a detailed but concise summary of our conversation above. Focus on information that would be helpful for continuing the conversation, including what we did, what we're doing, which files we're working on, and what we're going to do next.",
|
|
},
|
|
],
|
|
},
|
|
]),
|
|
})
|
|
next.parts.push({
|
|
type: "text",
|
|
text: result.text,
|
|
})
|
|
const assistant = next.metadata!.assistant!
|
|
const usage = getUsage(result.usage, model.info)
|
|
assistant.cost = usage.cost
|
|
assistant.tokens = usage.tokens
|
|
await updateMessage(next)
|
|
}
|
|
|
|
const pending = new Map<string, AbortController>()
|
|
function lock(sessionID: string) {
|
|
log.info("locking", { sessionID })
|
|
if (pending.has(sessionID)) throw new BusyError(sessionID)
|
|
const controller = new AbortController()
|
|
pending.set(sessionID, controller)
|
|
return {
|
|
signal: controller.signal,
|
|
[Symbol.dispose]() {
|
|
log.info("unlocking", { sessionID })
|
|
pending.delete(sessionID)
|
|
},
|
|
}
|
|
}
|
|
|
|
function getUsage(usage: LanguageModelUsage, model: Provider.Model) {
|
|
const tokens = {
|
|
input: usage.inputTokens ?? 0,
|
|
output: usage.outputTokens ?? 0,
|
|
reasoning: usage.reasoningTokens ?? 0,
|
|
}
|
|
return {
|
|
cost: new Decimal(0)
|
|
.add(new Decimal(tokens.input).mul(model.cost.input).div(1_000_000))
|
|
.add(new Decimal(tokens.output).mul(model.cost.output).div(1_000_000))
|
|
.toNumber(),
|
|
tokens,
|
|
}
|
|
}
|
|
|
|
export class BusyError extends Error {
|
|
constructor(public readonly sessionID: string) {
|
|
super(`Session ${sessionID} is busy`)
|
|
}
|
|
}
|
|
|
|
export async function initialize(input: {
|
|
sessionID: string
|
|
modelID: string
|
|
providerID: string
|
|
}) {
|
|
const app = App.info()
|
|
await Session.chat({
|
|
sessionID: input.sessionID,
|
|
providerID: input.providerID,
|
|
modelID: input.modelID,
|
|
parts: [
|
|
{
|
|
type: "text",
|
|
text: PROMPT_INITIALIZE.replace("${path}", app.path.root),
|
|
},
|
|
],
|
|
})
|
|
await App.initialize()
|
|
}
|
|
}
|