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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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18
packages/core/test/session-log.test.ts
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@ -35,7 +35,7 @@ const it = testEffect(
const location = Location.Ref.make({ directory: AbsolutePath.make("/project") })
describe("SessionV2.log", () => {
it.effect("replays public session events and marks caught-up at the aggregate watermark", () =>
it.effect("replays public session events and marks synced at the aggregate watermark", () =>
Effect.gen(function* () {
const session = yield* SessionV2.Service
const events = yield* EventV2.Service
@ -47,8 +47,8 @@ describe("SessionV2.log", () => {
// Session creation commits a non-public durable event, so the marker's
// seq covers more of the aggregate than the public events emitted.
expect(items.map((item) => item.type)).toEqual(["session.next.renamed", "log.caught_up"])
expect(items.at(-1)).toEqual({ type: "log.caught_up", aggregateID: created.id, seq: watermark })
expect(items.map((item) => item.type)).toEqual(["session.next.renamed", "log.synced"])
expect(items.at(-1)).toEqual({ type: "log.synced", aggregateID: created.id, seq: watermark })
}),
)
@ -64,7 +64,7 @@ describe("SessionV2.log", () => {
yield* session.rename({ sessionID: created.id, title: "renamed live" })
const items = Array.from(yield* Fiber.join(fiber))
expect(items.map((item) => item.type)).toEqual(["log.caught_up", "session.next.renamed"])
expect(items.map((item) => item.type)).toEqual(["log.synced", "session.next.renamed"])
}),
)
@ -95,13 +95,13 @@ describe("SessionV2.log", () => {
const items = Array.from(yield* Stream.runCollect(session.log({ sessionID: created.id, after: 1 })))
expect(
items.map((item): number | string | undefined => (EventV2.isCaughtUp(item) ? item.type : item.durable?.seq)),
).toEqual([3, 4, "log.caught_up"])
expect(items.at(-1)).toEqual({ type: "log.caught_up", aggregateID: created.id, seq: EventV2.Seq.make(4) })
items.map((item): number | string | undefined => (EventV2.isSynced(item) ? item.type : item.durable?.seq)),
).toEqual([3, 4, "log.synced"])
expect(items.at(-1)).toEqual({ type: "log.synced", aggregateID: created.id, seq: EventV2.Seq.make(4) })
}),
)
it.effect("completes with a bare caught-up marker for a migrated Session with no event sequence", () =>
it.effect("completes with a bare synced marker for a migrated Session with no event sequence", () =>
Effect.gen(function* () {
const db = (yield* Database.Service).db
const session = yield* SessionV2.Service
@ -125,7 +125,7 @@ describe("SessionV2.log", () => {
const items = Array.from(yield* Stream.runCollect(session.log({ sessionID })))
expect(items).toEqual([{ type: "log.caught_up", aggregateID: sessionID }])
expect(items).toEqual([{ type: "log.synced", aggregateID: sessionID }])
}),
)
})