import type { OrchestrationEvent, OrchestrationGetSnapshotError, OrchestrationThreadStreamItem,} from "@t3tools/contracts";import * as Deferred from "effect/Deferred";import * as Duration from "effect/Duration";import * as Effect from "effect/Effect";import * as Fiber from "effect/Fiber";import * as Predicate from "effect/Predicate";import * as Queue from "effect/Queue";import * as Semaphore from "effect/Semaphore";import * as Stream from "effect/Stream"; import { projectActivityEvent } from "./ActivityPayloadProjection.ts";import { makeLiveStreamBudget, type RetainedLiveItem } from "./LiveStreamBudget.ts"; const COALESCE_WINDOW = Duration.millis(50);const MAX_PENDING_UPDATES = 512; export type ThreadLiveInput = | { readonly kind: "event"; readonly event: OrchestrationEvent } | { readonly kind: "synchronized" }; function isToolUpdated(event: OrchestrationEvent): boolean { return ( event.type === "thread.activity-appended" && event.payload.activity.kind === "tool.updated" );} function asTrimmedString(value: unknown): string | null { if (!Predicate.isString(value)) { return null; } const trimmed = value.trim(); return trimmed.length > 0 ? trimmed : null;} function stableToolCallIdentity(event: OrchestrationEvent): string | null { if (event.type !== "thread.activity-appended") { return null; } const payload = event.payload.activity.payload; if (!Predicate.isObject(payload)) { return null; } const data = Predicate.isObject(payload.data) ? payload.data : null; return asTrimmedString(payload.toolCallId) ?? asTrimmedString(data?.toolCallId);} /** * Retain only the latest in-flight update for each stable tool-call id in a * live run. Anonymous calls pass through because labels are not unique when * tools execute in parallel. Survivors remain in sequence order. */export function coalesceLiveToolUpdatedEvents( events: ReadonlyArray<OrchestrationEvent>,): ReadonlyArray<OrchestrationEvent> { const survivors: Array<OrchestrationEvent> = []; let pendingUpdates: Array<OrchestrationEvent> = []; const flushUpdates = () => { const seen = new Set<string>(); const latestUpdates: Array<OrchestrationEvent> = []; for (let index = pendingUpdates.length - 1; index >= 0; index -= 1) { const event = pendingUpdates[index]!; const identity = stableToolCallIdentity(event); const activity = event.type === "thread.activity-appended" ? event.payload.activity : undefined; const key = identity ? `${activity?.turnId ?? ""}\u0000${identity}` : null; if (key && seen.has(key)) { continue; } if (key) { seen.add(key); } latestUpdates.push(event); } latestUpdates.reverse(); survivors.push(...latestUpdates); pendingUpdates = []; }; for (const event of events) { if (isToolUpdated(event)) { pendingUpdates.push(event); continue; } flushUpdates(); survivors.push(event); } flushUpdates(); return survivors;} export const makeThreadLiveEventCoalescer = Effect.fn("makeThreadLiveEventCoalescer")( function* (options?: { readonly coalesceWindow?: Duration.Input; readonly maxItems?: number; readonly maxSerializedBytes?: number; }) { const coalescerScope = yield* Effect.scope; const budget = yield* makeLiveStreamBudget(options); const cleanupComplete = yield* Deferred.make<void>(); const output = yield* Queue.unbounded< RetainedLiveItem<OrchestrationThreadStreamItem>, OrchestrationGetSnapshotError >(); const mutex = yield* Semaphore.make(1); const coalesceWindow = options?.coalesceWindow ?? COALESCE_WINDOW; let pendingUpdates: Array<RetainedLiveItem<OrchestrationEvent>> = []; let windowGeneration = 0; let windowFiber: Fiber.Fiber<void, never> | null = null; let closed = false; const cancelWindow = Effect.fn("ThreadLiveEventCoalescer.cancelWindow")(function* () { const fiber = windowFiber; if (!fiber) { return; } windowFiber = null; yield* Fiber.interrupt(fiber); }); const flushPending = Effect.fn("ThreadLiveEventCoalescer.flushPending")(function* () { if (pendingUpdates.length === 0) { return; } const items = yield* budget.replace( pendingUpdates, coalesceLiveToolUpdatedEvents(pendingUpdates.map((item) => item.value)).map((event) => ({ kind: "event" as const, event, })), (item) => item.event, ); pendingUpdates = []; yield* Queue.offerAll(output, items); }, Effect.uninterruptible); const flushWindow = (generation: number) => Effect.sleep(coalesceWindow).pipe( Effect.andThen( mutex.withPermits(1)( Effect.suspend(() => (generation === windowGeneration ? flushPending() : Effect.void)), ), ), Effect.ensuring( Effect.sync(() => { if (generation === windowGeneration) { windowFiber = null; } }), ), Effect.catchTags({ OrchestrationGetSnapshotError: () => Effect.void }), ); // Keep each source batch together so a synchronization marker cannot pass // events already pulled from PubSub but still being coalesced. const offerAll = Effect.fn("ThreadLiveEventCoalescer.offerAll")(function* ( inputs: ReadonlyArray<ThreadLiveInput>, ) { yield* mutex.withPermits(1)( Effect.forEach( inputs, (input) => Effect.gen(function* () { yield* budget.check; if (input.kind === "event") { // Retain only the client payload, not full persisted tool output. yield* budget.retain(projectActivityEvent(input.event)).pipe( Effect.tap((item) => Effect.sync(() => pendingUpdates.push(item))), Effect.uninterruptible, ); } if (input.kind === "event" && isToolUpdated(input.event)) { if (pendingUpdates.length === 1) { const generation = ++windowGeneration; windowFiber = yield* Effect.forkIn(flushWindow(generation), coalescerScope); } if (pendingUpdates.length >= MAX_PENDING_UPDATES) { yield* cancelWindow(); windowGeneration += 1; yield* flushPending(); } return; } yield* cancelWindow(); windowGeneration += 1; // A non-update event closes the run immediately. The coalescer keeps // that boundary after the final update from the run. yield* flushPending(); if (input.kind === "synchronized") { yield* budget.retain({ kind: "synchronized" as const }).pipe( Effect.flatMap((marker) => Queue.offer(output, marker)), Effect.uninterruptible, ); } }), { discard: true }, ), ); }); const close = (error?: OrchestrationGetSnapshotError) => mutex.withPermits(1)( Effect.gen(function* () { if (closed) { return; } closed = true; windowGeneration += 1; yield* cancelWindow(); budget.release(pendingUpdates); pendingUpdates = []; budget.release(yield* Queue.clear(output).pipe(Effect.orDie)); if (error) { yield* Queue.fail(output, error); } yield* Queue.shutdown(output); yield* Deferred.succeed(cleanupComplete, undefined); }), ); yield* Effect.addFinalizer(() => close()); yield* budget.failed.pipe( Effect.catchTags({ OrchestrationGetSnapshotError: close }), Effect.forkScoped, ); return { offer: (input: ThreadLiveInput) => offerAll([input]), offerAll, stream: budget.deliver(Stream.fromQueue(output)), failed: budget.failed, closed: Deferred.await(cleanupComplete), usage: budget.usage, } as const; },);
import type {
OrchestrationEvent,
OrchestrationGetSnapshotError,
OrchestrationThreadStreamItem,
} from "@t3tools/contracts";
import * as Deferred from "effect/Deferred";
import * as Duration from "effect/Duration";
import * as Effect from "effect/Effect";
import * as Fiber from "effect/Fiber";
import * as Predicate from "effect/Predicate";
import * as Queue from "effect/Queue";
import * as Semaphore from "effect/Semaphore";
import * as Stream from "effect/Stream";
import { projectActivityEvent } from "./ActivityPayloadProjection.ts";
import { makeLiveStreamBudget, type RetainedLiveItem } from "./LiveStreamBudget.ts";
const COALESCE_WINDOW = Duration.millis(50);
const MAX_PENDING_UPDATES = 512;
export type ThreadLiveInput =
| { readonly kind: "event"; readonly event: OrchestrationEvent }
| { readonly kind: "synchronized" };
function isToolUpdated(event: OrchestrationEvent): boolean {
return (
event.type === "thread.activity-appended" && event.payload.activity.kind === "tool.updated"
);
}
function asTrimmedString(value: unknown): string | null {
if (!Predicate.isString(value)) {
return null;
}
const trimmed = value.trim();
return trimmed.length > 0 ? trimmed : null;
}
function stableToolCallIdentity(event: OrchestrationEvent): string | null {
if (event.type !== "thread.activity-appended") {
return null;
}
const payload = event.payload.activity.payload;
if (!Predicate.isObject(payload)) {
return null;
}
const data = Predicate.isObject(payload.data) ? payload.data : null;
return asTrimmedString(payload.toolCallId) ?? asTrimmedString(data?.toolCallId);
}
/**
* Retain only the latest in-flight update for each stable tool-call id in a
* live run. Anonymous calls pass through because labels are not unique when
* tools execute in parallel. Survivors remain in sequence order.
*/
export function coalesceLiveToolUpdatedEvents(
events: ReadonlyArray<OrchestrationEvent>,
): ReadonlyArray<OrchestrationEvent> {
const survivors: Array<OrchestrationEvent> = [];
let pendingUpdates: Array<OrchestrationEvent> = [];
const flushUpdates = () => {
const seen = new Set<string>();
const latestUpdates: Array<OrchestrationEvent> = [];
for (let index = pendingUpdates.length - 1; index >= 0; index -= 1) {
const event = pendingUpdates[index]!;
const identity = stableToolCallIdentity(event);
const activity =
event.type === "thread.activity-appended" ? event.payload.activity : undefined;
const key = identity ? `${activity?.turnId ?? ""}\u0000${identity}` : null;
if (key && seen.has(key)) {
continue;
}
if (key) {
seen.add(key);
}
latestUpdates.push(event);
}
latestUpdates.reverse();
survivors.push(...latestUpdates);
pendingUpdates = [];
};
for (const event of events) {
if (isToolUpdated(event)) {
pendingUpdates.push(event);
continue;
}
flushUpdates();
survivors.push(event);
}
flushUpdates();
return survivors;
}
export const makeThreadLiveEventCoalescer = Effect.fn("makeThreadLiveEventCoalescer")(
function* (options?: {
readonly coalesceWindow?: Duration.Input;
readonly maxItems?: number;
readonly maxSerializedBytes?: number;
}) {
const coalescerScope = yield* Effect.scope;
const budget = yield* makeLiveStreamBudget(options);
const cleanupComplete = yield* Deferred.make<void>();
const output = yield* Queue.unbounded<
RetainedLiveItem<OrchestrationThreadStreamItem>,
OrchestrationGetSnapshotError
>();
const mutex = yield* Semaphore.make(1);
const coalesceWindow = options?.coalesceWindow ?? COALESCE_WINDOW;
let pendingUpdates: Array<RetainedLiveItem<OrchestrationEvent>> = [];
let windowGeneration = 0;
let windowFiber: Fiber.Fiber<void, never> | null = null;
let closed = false;
const cancelWindow = Effect.fn("ThreadLiveEventCoalescer.cancelWindow")(function* () {
const fiber = windowFiber;
if (!fiber) {
return;
}
windowFiber = null;
yield* Fiber.interrupt(fiber);
});
const flushPending = Effect.fn("ThreadLiveEventCoalescer.flushPending")(function* () {
if (pendingUpdates.length === 0) {
return;
}
const items = yield* budget.replace(
pendingUpdates,
coalesceLiveToolUpdatedEvents(pendingUpdates.map((item) => item.value)).map((event) => ({
kind: "event" as const,
event,
})),
(item) => item.event,
);
pendingUpdates = [];
yield* Queue.offerAll(output, items);
}, Effect.uninterruptible);
const flushWindow = (generation: number) =>
Effect.sleep(coalesceWindow).pipe(
Effect.andThen(
mutex.withPermits(1)(
Effect.suspend(() => (generation === windowGeneration ? flushPending() : Effect.void)),
),
),
Effect.ensuring(
Effect.sync(() => {
if (generation === windowGeneration) {
windowFiber = null;
}
}),
),
Effect.catchTags({ OrchestrationGetSnapshotError: () => Effect.void }),
);
// Keep each source batch together so a synchronization marker cannot pass
// events already pulled from PubSub but still being coalesced.
const offerAll = Effect.fn("ThreadLiveEventCoalescer.offerAll")(function* (
inputs: ReadonlyArray<ThreadLiveInput>,
) {
yield* mutex.withPermits(1)(
Effect.forEach(
inputs,
(input) =>
Effect.gen(function* () {
yield* budget.check;
if (input.kind === "event") {
// Retain only the client payload, not full persisted tool output.
yield* budget.retain(projectActivityEvent(input.event)).pipe(
Effect.tap((item) => Effect.sync(() => pendingUpdates.push(item))),
Effect.uninterruptible,
);
}
if (input.kind === "event" && isToolUpdated(input.event)) {
if (pendingUpdates.length === 1) {
const generation = ++windowGeneration;
windowFiber = yield* Effect.forkIn(flushWindow(generation), coalescerScope);
}
if (pendingUpdates.length >= MAX_PENDING_UPDATES) {
yield* cancelWindow();
windowGeneration += 1;
yield* flushPending();
}
return;
}
yield* cancelWindow();
windowGeneration += 1;
// A non-update event closes the run immediately. The coalescer keeps
// that boundary after the final update from the run.
yield* flushPending();
if (input.kind === "synchronized") {
yield* budget.retain({ kind: "synchronized" as const }).pipe(
Effect.flatMap((marker) => Queue.offer(output, marker)),
Effect.uninterruptible,
);
}
}),
{ discard: true },
),
);
});
const close = (error?: OrchestrationGetSnapshotError) =>
mutex.withPermits(1)(
Effect.gen(function* () {
if (closed) {
return;
}
closed = true;
windowGeneration += 1;
yield* cancelWindow();
budget.release(pendingUpdates);
pendingUpdates = [];
budget.release(yield* Queue.clear(output).pipe(Effect.orDie));
if (error) {
yield* Queue.fail(output, error);
}
yield* Queue.shutdown(output);
yield* Deferred.succeed(cleanupComplete, undefined);
}),
);
yield* Effect.addFinalizer(() => close());
yield* budget.failed.pipe(
Effect.catchTags({ OrchestrationGetSnapshotError: close }),
Effect.forkScoped,
);
return {
offer: (input: ThreadLiveInput) => offerAll([input]),
offerAll,
stream: budget.deliver(Stream.fromQueue(output)),
failed: budget.failed,
closed: Deferred.await(cleanupComplete),
usage: budget.usage,
} as const;
},
);