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fix(server): reconcile stopped sessions after restart #4562

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8c5cb8f
fix(server): reconcile stopped sessions after restart
PixPMusic Jul 26, 2026
dca27c9
fix(server): guard session reconciliation
PixPMusic Jul 26, 2026
56da49d
fix(server): keep session reconciliation retryable
PixPMusic Jul 26, 2026
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22 changes: 22 additions & 0 deletions apps/server/src/orchestration/decider.settled.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -470,6 +470,28 @@ it.layer(NodeServices.layer)("settled thread decider", (it) => {
}),
);

it.effect("rejects a conditional session write after the projected session changes", () =>
Effect.gen(function* () {
const currentSession = makeSession("running");
const error = yield* decideOrchestrationCommand({
command: {
type: "thread.session.set",
commandId: CommandId.make("cmd-stale-session-write"),
threadId: ThreadId.make("thread-1"),
expectedSessionUpdatedAt: "2025-12-31T23:59:00.000Z",
session: {
...currentSession,
status: "stopped",
},
createdAt: NOW,
},
readModel: makeReadModel(null, null, currentSession),
}).pipe(Effect.flip);

expect(error._tag).toBe("OrchestrationCommandInvariantError");
}),
);

it.effect("unsettles for approval and user-input activities but not others", () =>
Effect.gen(function* () {
const approvalResult = yield* decideOrchestrationCommand({
Expand Down
9 changes: 9 additions & 0 deletions apps/server/src/orchestration/decider.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -946,6 +946,15 @@ export const decideOrchestrationCommand = Effect.fn("decideOrchestrationCommand"
command,
threadId: command.threadId,
});
if (
command.expectedSessionUpdatedAt !== undefined &&
thread.session?.updatedAt !== command.expectedSessionUpdatedAt
) {
return yield* new OrchestrationCommandInvariantError({
commandType: command.type,
detail: `Thread '${command.threadId}' session changed after the command was prepared.`,
});
}
const sessionSetEvent: Omit<OrchestrationEvent, "sequence"> = {
...(yield* withEventBase({
aggregateKind: "thread",
Expand Down
141 changes: 135 additions & 6 deletions apps/server/src/provider/Layers/ProviderSessionReaper.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,10 @@ import * as Scope from "effect/Scope";
import * as Stream from "effect/Stream";
import { afterEach, describe, expect, it, vi } from "vite-plus/test";

import {
OrchestrationEngineService,
type OrchestrationEngineShape,
} from "../../orchestration/Services/OrchestrationEngine.ts";
import { ProjectionSnapshotQuery } from "../../orchestration/Services/ProjectionSnapshotQuery.ts";
import { SqlitePersistenceMemory } from "../../persistence/Layers/Sqlite.ts";
import * as ProviderSessionRuntime from "../../persistence/ProviderSessionRuntime.ts";
Expand Down Expand Up @@ -176,6 +180,9 @@ describe("ProviderSessionReaper", () => {
rollbackConversation: () => unsupported(),
streamEvents: Stream.empty,
};
const dispatch = vi.fn<OrchestrationEngineShape["dispatch"]>(() =>
Effect.succeed({ sequence: 1 }),
);

const runtimeRepositoryLayer = ProviderSessionRuntime.layer.pipe(
Layer.provide(SqlitePersistenceMemory),
Expand All @@ -190,6 +197,14 @@ describe("ProviderSessionReaper", () => {
Layer.provideMerge(providerSessionDirectoryLayer),
Layer.provideMerge(runtimeRepositoryLayer),
Layer.provideMerge(Layer.succeed(ProviderService, providerService)),
Layer.provideMerge(
Layer.succeed(OrchestrationEngineService, {
dispatch,
readEvents: () => Stream.empty,
streamDomainEvents: Stream.empty,
latestSequence: Effect.succeed(0),
}),
),
Layer.provideMerge(
Layer.succeed(ProjectionSnapshotQuery, {
getCommandReadModel: () => Effect.die("unused"),
Expand Down Expand Up @@ -218,9 +233,123 @@ describe("ProviderSessionReaper", () => {
);

runtime = ManagedRuntime.make(layer);
return { stopSession, stoppedThreadIds };
return { dispatch, stopSession, stoppedThreadIds };
}

it("projects durable stopped bindings that were left working during shutdown", async () => {
const threadId = ThreadId.make("thread-reaper-stopped-during-shutdown");
const projectedAt = "2026-04-14T00:00:00.000Z";
const stoppedAt = "2026-04-14T00:01:00.000Z";
const harness = await createHarness({
readModel: makeReadModel([
{
id: threadId,
session: {
threadId,
status: "starting",
providerName: "codex",
runtimeMode: "full-access",
activeTurnId: null,
lastError: null,
updatedAt: projectedAt,
},
},
]),
});
const repository = await runtime!.runPromise(
Effect.service(ProviderSessionRuntime.ProviderSessionRuntimeRepository),
);

await runtime!.runPromise(
repository.upsert({
threadId,
providerName: "codex",
providerInstanceId: ProviderInstanceId.make("codex"),
adapterKey: "codex",
runtimeMode: "full-access",
status: "stopped",
lastSeenAt: stoppedAt,
resumeCursor: null,
runtimePayload: {
activeTurnId: null,
lastRuntimeEvent: "provider.stopAll",
lastRuntimeEventAt: stoppedAt,
},
}),
);

const reaper = await runtime!.runPromise(Effect.service(ProviderSessionReaper));
scope = await Effect.runPromise(Scope.make("sequential"));
await Effect.runPromise(reaper.start().pipe(Scope.provide(scope)));

await waitFor(() => harness.dispatch.mock.calls.length === 1);

expect(harness.stopSession).not.toHaveBeenCalled();
expect(harness.dispatch.mock.calls[0]?.[0]).toMatchObject({
type: "thread.session.set",
threadId,
expectedSessionUpdatedAt: projectedAt,
createdAt: stoppedAt,
session: {
threadId,
status: "stopped",
providerName: "codex",
providerInstanceId: "codex",
runtimeMode: "full-access",
activeTurnId: null,
lastError: null,
updatedAt: stoppedAt,
},
});
});

it("does not overwrite a projected session newer than the stopped binding", async () => {
const threadId = ThreadId.make("thread-reaper-stale-stopped-binding");
const stoppedAt = "2026-04-14T00:00:00.000Z";
const projectedAt = "2026-04-14T00:01:00.000Z";
const harness = await createHarness({
readModel: makeReadModel([
{
id: threadId,
session: {
threadId,
status: "starting",
providerName: "codex",
runtimeMode: "full-access",
activeTurnId: null,
lastError: null,
updatedAt: projectedAt,
},
},
]),
});
const repository = await runtime!.runPromise(
Effect.service(ProviderSessionRuntime.ProviderSessionRuntimeRepository),
);

await runtime!.runPromise(
repository.upsert({
threadId,
providerName: "codex",
providerInstanceId: ProviderInstanceId.make("codex"),
adapterKey: "codex",
runtimeMode: "full-access",
status: "stopped",
lastSeenAt: stoppedAt,
resumeCursor: null,
runtimePayload: null,
}),
);

const reaper = await runtime!.runPromise(Effect.service(ProviderSessionReaper));
scope = await Effect.runPromise(Scope.make("sequential"));
await Effect.runPromise(reaper.start().pipe(Scope.provide(scope)));
await Effect.runPromise(drainFibers);

expect(harness.dispatch).not.toHaveBeenCalled();
expect(harness.stopSession).not.toHaveBeenCalled();
});

it("reaps stale persisted sessions without active turns", async () => {
const threadId = ThreadId.make("thread-reaper-stale");
const now = "2026-01-01T00:00:00.000Z";
Expand Down Expand Up @@ -362,7 +491,7 @@ describe("ProviderSessionReaper", () => {
const reaper = await runtime!.runPromise(Effect.service(ProviderSessionReaper));
scope = await Effect.runPromise(Scope.make("sequential"));
await Effect.runPromise(reaper.start().pipe(Scope.provide(scope)));
await Effect.runPromise(drainFibers);
await runtime!.runPromise(drainFibers);

expect(harness.stopSession).not.toHaveBeenCalled();
const remaining = await runtime!.runPromise(repository.getByThreadId({ threadId }));
Expand Down Expand Up @@ -409,8 +538,8 @@ describe("ProviderSessionReaper", () => {
);

const reaper = await runtime!.runPromise(Effect.service(ProviderSessionReaper));
scope = await Effect.runPromise(Scope.make("sequential"));
await Effect.runPromise(reaper.start().pipe(Scope.provide(scope)));
scope = await runtime!.runPromise(Scope.make("sequential"));
await runtime!.runPromise(reaper.start().pipe(Scope.provide(scope)));
await Effect.runPromise(drainFibers);

expect(harness.stopSession).not.toHaveBeenCalled();
Expand Down Expand Up @@ -495,8 +624,8 @@ describe("ProviderSessionReaper", () => {
);

const reaper = await runtime!.runPromise(Effect.service(ProviderSessionReaper));
scope = await Effect.runPromise(Scope.make("sequential"));
await Effect.runPromise(reaper.start().pipe(Scope.provide(scope)));
scope = await runtime!.runPromise(Scope.make("sequential"));
await runtime!.runPromise(reaper.start().pipe(Scope.provide(scope)));

await waitFor(() => harness.stopSession.mock.calls.length === 2);

Expand Down
93 changes: 92 additions & 1 deletion apps/server/src/provider/Layers/ProviderSessionReaper.ts
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Original file line number Diff line number Diff line change
@@ -1,12 +1,17 @@
import { CommandId } from "@t3tools/contracts";
import * as Clock from "effect/Clock";
import * as Duration from "effect/Duration";
import * as Effect from "effect/Effect";
import * as Layer from "effect/Layer";
import * as Option from "effect/Option";
import * as Schedule from "effect/Schedule";

import { OrchestrationEngineService } from "../../orchestration/Services/OrchestrationEngine.ts";
import { ProjectionSnapshotQuery } from "../../orchestration/Services/ProjectionSnapshotQuery.ts";
import { ProviderSessionDirectory } from "../Services/ProviderSessionDirectory.ts";
import {
ProviderSessionDirectory,
type ProviderRuntimeBindingWithMetadata,
} from "../Services/ProviderSessionDirectory.ts";
import {
ProviderSessionReaper,
type ProviderSessionReaperShape,
Expand All @@ -25,6 +30,7 @@ const makeProviderSessionReaper = (options?: ProviderSessionReaperLiveOptions) =
Effect.gen(function* () {
const providerService = yield* ProviderService;
const directory = yield* ProviderSessionDirectory;
const orchestrationEngine = yield* OrchestrationEngineService;
const projectionSnapshotQuery = yield* ProjectionSnapshotQuery;

const inactivityThresholdMs = Math.max(
Expand All @@ -33,13 +39,98 @@ const makeProviderSessionReaper = (options?: ProviderSessionReaperLiveOptions) =
);
const sweepIntervalMs = Math.max(1, options?.sweepIntervalMs ?? DEFAULT_SWEEP_INTERVAL_MS);

// Provider shutdown can persist "stopped" after runtime event consumers
// have closed, leaving the projection on its last transient status.
const reconcileStoppedBinding = Effect.fn("ProviderSessionReaper.reconcileStoppedBinding")(
function* (binding: ProviderRuntimeBindingWithMetadata) {
const thread = yield* projectionSnapshotQuery
.getThreadShellById(binding.threadId)
.pipe(Effect.map(Option.getOrUndefined));
const session = thread?.session;
if (!session || session.status === "stopped") {
return;
}

const stoppedAtMs = Date.parse(binding.lastSeenAt);
if (Number.isNaN(stoppedAtMs)) {
yield* Effect.logWarning("provider.session.reaper.invalid-last-seen", {
threadId: binding.threadId,
provider: binding.provider,
lastSeenAt: binding.lastSeenAt,
});
return;
}

const projectedAtMs = Date.parse(session.updatedAt);
if (!Number.isNaN(projectedAtMs) && stoppedAtMs < projectedAtMs) {
yield* Effect.logDebug("provider.session.reaper.skipped-stale-stopped-binding", {
threadId: binding.threadId,
provider: binding.provider,
bindingLastSeenAt: binding.lastSeenAt,
projectedSessionUpdatedAt: session.updatedAt,
});
return;
}

yield* orchestrationEngine
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.dispatch({
type: "thread.session.set",
commandId: CommandId.make(
`server:provider-session-reconcile:${binding.threadId}:${binding.lastSeenAt}`,
),
threadId: binding.threadId,
expectedSessionUpdatedAt: session.updatedAt,
session: {
threadId: binding.threadId,
status: "stopped",
providerName: binding.provider,
...(binding.providerInstanceId !== undefined
? { providerInstanceId: binding.providerInstanceId }
: session.providerInstanceId !== undefined
? { providerInstanceId: session.providerInstanceId }
: {}),
runtimeMode: binding.runtimeMode ?? session.runtimeMode,
activeTurnId: null,
lastError: session.lastError,
updatedAt: binding.lastSeenAt,
},
createdAt: binding.lastSeenAt,
})
.pipe(
Effect.tap(() =>
Effect.logInfo("provider.session.reaper.reconciled-stopped-binding", {
threadId: binding.threadId,
provider: binding.provider,
stoppedAt: binding.lastSeenAt,
projectedStatus: session.status,
}),
),
Effect.catchTag("OrchestrationCommandInvariantError", () =>
Effect.logDebug("provider.session.reaper.skipped-concurrent-session-update", {
threadId: binding.threadId,
provider: binding.provider,
projectedSessionUpdatedAt: session.updatedAt,
}),
),
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Effect.catchCause((cause) =>
Effect.logWarning("provider.session.reaper.reconcile-stopped-binding-failed", {
threadId: binding.threadId,
provider: binding.provider,
cause,
}),
),
);
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},
);

const sweep = Effect.gen(function* () {
const bindings = yield* directory.listBindings();
const now = yield* Clock.currentTimeMillis;
let reapedCount = 0;

for (const binding of bindings) {
if (binding.status === "stopped") {
yield* reconcileStoppedBinding(binding);
continue;
}

Expand Down
1 change: 1 addition & 0 deletions packages/contracts/src/orchestration.ts
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Expand Up @@ -800,6 +800,7 @@ const ThreadSessionSetCommand = Schema.Struct({
commandId: CommandId,
threadId: ThreadId,
session: OrchestrationSession,
expectedSessionUpdatedAt: Schema.optional(IsoDateTime),
createdAt: IsoDateTime,
});

Expand Down
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