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feat(core): deterministic session log replay with synced watermark (#35040)

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Kit Langton 2026-07-02 21:38:20 -04:00 • committed by GitHub
commit 57e9e9771d
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16 changed files with 205 additions and 87 deletions
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8
packages/client/test/effect.test.ts
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@ -3,7 +3,7 @@ import { DateTime, Effect, Stream } from "effect"
import { HttpClient, HttpClientResponse } from "effect/unstable/http"
import { AbsolutePath, Agent, Event, Location, Model, OpenCode, Prompt, Session, SessionMessage } from "../src/effect"
const caughtUp = { type: "log.caught_up" as const, aggregateID: "ses_test", seq: Event.Seq.make(1) }
const synced = { type: "log.synced" as const, aggregateID: "ses_test", seq: Event.Seq.make(1) }
test("session.get returns the decoded Effect projection", async () => {
const httpClient = HttpClient.make((request) =>
@ -70,7 +70,7 @@ test("session methods retain decoded Effect inputs and outputs", async () => {
return Effect.succeed(
HttpClientResponse.fromWeb(
request,
new Response(`data: ${JSON.stringify(modelSwitchedEvent)}\n\ndata: ${JSON.stringify(caughtUp)}\n\n`, {
new Response(`data: ${JSON.stringify(modelSwitchedEvent)}\n\ndata: ${JSON.stringify(synced)}\n\n`, {
headers: { "content-type": "text/event-stream" },
}),
),
@ -149,11 +149,11 @@ test("session methods retain decoded Effect inputs and outputs", async () => {
expect(result.context).toEqual([])
expect(logQueries[0]).toEqual({ after: "0" })
const logged = Array.from(result.log)
expect(logged.map((item) => item.type)).toEqual(["session.next.model.switched", "log.caught_up"])
expect(logged.map((item) => item.type)).toEqual(["session.next.model.switched", "log.synced"])
expect(logged[0]?.type === "session.next.model.switched" && DateTime.toEpochMillis(logged[0].data.timestamp)).toBe(
1_717_171_717_000,
)
expect(logged.at(-1)).toEqual(caughtUp)
expect(logged.at(-1)).toEqual(synced)
expect(result.message).toEqual(expect.objectContaining({ id: "msg_model", type: "model-switched" }))
})