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type { SerializedError } from '../../error/utils';\n\nconst MAX_CAUSE_DEPTH = 5;\n\n/**\n * Serializes an Error instance to a plain SerializedError object without\n * mutating the original. Unlike `getErrorFromUnknown(...).toJSON()`, this does\n * not attach a non-enumerable `toJSON` to the live Error.\n */\nexport function serializeError(err: Error, depth = 0): SerializedError {\n const json: SerializedError = {\n name: err.name || 'Error',\n message: err.message,\n };\n if (err.stack !== undefined) json.stack = err.stack;\n\n if (err.cause !== undefined) {\n if (err.cause instanceof Error && depth < MAX_CAUSE_DEPTH) {\n json.cause = serializeError(err.cause, depth + 1);\n } else {\n json.cause = err.cause;\n }\n }\n\n // Copy enumerable own properties (custom error fields)\n for (const key in err) {\n if (!Object.prototype.hasOwnProperty.call(err, key)) continue;\n if (key === 'message' || key === 'name' || key === 'stack' || key === 'cause') continue;\n json[key] = (err as unknown as Record)[key];\n }\n\n return json;\n}\n\n/**\n * Rehydrates a SerializedError into a vanilla Error instance. We never\n * instantiate user-controlled prototypes — name is preserved as a string field.\n */\nexport function rehydrateError(s: SerializedError): Error {\n const cause =\n s.cause !== undefined\n ? s.cause && typeof s.cause === 'object' && 'message' in (s.cause as object) && 'name' in (s.cause as object)\n ? rehydrateError(s.cause as SerializedError)\n : s.cause\n : undefined;\n\n const err = cause !== undefined ? new Error(s.message, { cause }) : new Error(s.message);\n if (s.name) err.name = s.name;\n if (s.stack !== undefined) err.stack = s.stack;\n\n for (const key in s) {\n if (!Object.prototype.hasOwnProperty.call(s, key)) continue;\n if (key === 'message' || key === 'name' || key === 'stack' || key === 'cause') continue;\n (err as unknown as Record)[key] = s[key];\n }\n\n return err;\n}\n","/**\n * Class registry for the pubsub frame codec. Lets non-plain class instances\n * (e.g. GeneratedFile) survive a JSON round-trip across the unix-socket\n * pubsub transport.\n *\n * The registry is closed: only classes registered here can be reconstructed.\n * Unknown class names decode to plain data so we never instantiate\n * user-controlled prototypes.\n */\nexport interface ClassCodec {\n /** Convert an instance to JSON-safe data. */\n toData(instance: T): D;\n /** Reconstruct an instance from previously serialized data. */\n fromData(data: D): T;\n}\n\nconst classRegistry = new Map();\n\nexport function registerClass(name: string, codec: ClassCodec): void {\n classRegistry.set(name, codec as ClassCodec);\n}\n\nexport function unregisterClass(name: string): void {\n classRegistry.delete(name);\n}\n\nexport function getClassCodec(name: string): ClassCodec | undefined {\n return classRegistry.get(name);\n}\n\nexport function hasClassCodec(name: string): boolean {\n return classRegistry.has(name);\n}\n","import type { ToolSet } from '@internal/ai-sdk-v5';\nimport { DefaultGeneratedFile, DefaultGeneratedFileWithType } from '../../stream/aisdk/v5/file';\nimport { DefaultStepResult } from '../../stream/aisdk/v5/output-helpers';\nimport { registerClass } from './registry';\n\ntype GeneratedFileData = { data: string; mediaType: string };\n\ntype DefaultStepResultData = {\n content: DefaultStepResult['content'];\n finishReason: DefaultStepResult['finishReason'];\n usage: DefaultStepResult['usage'];\n warnings: DefaultStepResult['warnings'];\n request: DefaultStepResult['request'];\n response: DefaultStepResult['response'];\n providerMetadata: DefaultStepResult['providerMetadata'];\n tripwire?: DefaultStepResult['tripwire'];\n};\n\n/**\n * Built-in class codecs.\n *\n * IMPORTANT: This module must be loaded for `instanceof` to survive\n * serialization across the unix-socket pubsub. The `BUILTIN_CODECS_REGISTERED`\n * constant exists solely so consumers can import it as a *named* import (see\n * `codec.ts`). A `import './registrations'` side-effect import would be\n * tree-shaken out of dist consumers because `packages/core/package.json` has\n * `\"sideEffects\": false`. Named imports are kept by every bundler.\n *\n * `DefaultStepResult` flows through workflow output schemas typed as\n * `z.any()`, so it crosses the unix-socket pubsub on the evented engine.\n * Without a class registration, consumers that rely on\n * `instanceof DefaultStepResult` (e.g. the in-memory storage path) would\n * receive plain data. The generic `TOOLS` type parameter is erased at\n * runtime, so we register the constructor name once.\n */\nexport const BUILTIN_CODECS_REGISTERED = (() => {\n registerClass('DefaultGeneratedFile', {\n toData: f => ({ data: f.base64, mediaType: f.mediaType }),\n fromData: d => new DefaultGeneratedFile({ data: d.data, mediaType: d.mediaType }),\n });\n\n registerClass('DefaultGeneratedFileWithType', {\n toData: f => ({ data: f.base64, mediaType: f.mediaType }),\n fromData: d => new DefaultGeneratedFileWithType({ data: d.data, mediaType: d.mediaType }),\n });\n\n registerClass, DefaultStepResultData>('DefaultStepResult', {\n toData: s => ({\n content: s.content,\n finishReason: s.finishReason,\n usage: s.usage,\n warnings: s.warnings,\n request: s.request,\n response: s.response,\n providerMetadata: s.providerMetadata,\n tripwire: s.tripwire,\n }),\n fromData: d => new DefaultStepResult(d),\n });\n\n return true as const;\n})();\n","import type { SerializedError } from '../../error/utils';\n\n/**\n * Discriminator key for codec-tagged envelopes. Long, namespaced, and unlikely\n * to collide with user data. Plain objects that happen to carry this key but\n * do not match an envelope shape are preserved as-is by the decoder.\n *\n * **Reservation contract:** `__m_codec__` is reserved on the wire. Do not use\n * it as a property name on user objects that cross the pubsub boundary — if\n * the surrounding shape also happens to match an envelope (e.g.\n * `{ __m_codec__: 'Date', v: '...' }`), the decoder will reconstruct it as\n * the tagged type. The conservative shape check in `isEnvelope` keeps the\n * blast radius narrow, and `toJSON()` is skipped for objects already carrying\n * this key, but the safest path is to avoid the namespace entirely.\n */\nexport const CODEC_TAG = '__m_codec__';\n\n/**\n * Upper bound on the `source` length of a serialized `RegExp` envelope. Real\n * serialized regexes are tens of characters at most; this is generous headroom\n * for unusual patterns while bounding the input to `new RegExp(...)` on decode\n * so a hostile peer cannot push an unbounded pattern through the constructor.\n */\nexport const MAX_REGEXP_SOURCE_LENGTH = 1024;\n\nexport type EnvelopeTag = 'Date' | 'Error' | 'Map' | 'Set' | 'RegExp' | 'URL' | 'BigInt' | 'Undefined' | 'Class';\n\nexport type Envelope =\n | { [CODEC_TAG]: 'Date'; v: string }\n | { [CODEC_TAG]: 'Error'; v: SerializedError }\n | { [CODEC_TAG]: 'Map'; v: Array<[unknown, unknown]> }\n | { [CODEC_TAG]: 'Set'; v: Array }\n | { [CODEC_TAG]: 'RegExp'; v: { source: string; flags: string } }\n | { [CODEC_TAG]: 'URL'; v: string }\n | { [CODEC_TAG]: 'BigInt'; v: string }\n | { [CODEC_TAG]: 'Undefined' }\n | { [CODEC_TAG]: 'Class'; n: string; v: unknown };\n\n/**\n * Returns true when `value` looks like a codec envelope. The check is\n * conservative — an object with the tag key but an unknown tag value, or a\n * shape that does not match any envelope variant, is treated as user data.\n */\nexport function isEnvelope(value: object): value is Envelope {\n const tag = (value as Record)[CODEC_TAG];\n if (typeof tag !== 'string') return false;\n switch (tag as EnvelopeTag) {\n case 'Undefined':\n return true;\n case 'Date':\n case 'BigInt':\n case 'URL':\n return typeof (value as { v?: unknown }).v === 'string';\n case 'RegExp': {\n const v = (value as { v?: unknown }).v as { source?: unknown; flags?: unknown } | undefined;\n if (!v || typeof v.source !== 'string' || typeof v.flags !== 'string') return false;\n // Bound `source` to a generous-but-finite length. Real-world serialized\n // regexes are tiny; a multi-KB pattern is either corrupted or a ReDoS\n // attempt, and we'd rather treat it as user data than feed it into\n // `new RegExp(...)`.\n if (v.source.length > MAX_REGEXP_SOURCE_LENGTH) return false;\n // Bound flags to the spec-defined RegExp flags. Anything else means the\n // payload is either corrupted or hostile — treat as user data and let\n // the decoder skip envelope reconstruction.\n return /^[dgimsuvy]*$/.test(v.flags) && new Set(v.flags).size === v.flags.length;\n }\n case 'Map':\n case 'Set':\n return Array.isArray((value as { v?: unknown }).v);\n case 'Error':\n return typeof (value as { v?: unknown }).v === 'object' && (value as { v?: unknown }).v !== null;\n case 'Class':\n return typeof (value as { n?: unknown }).n === 'string';\n default:\n return false;\n }\n}\n","import type { SerializedError } from '../../error/utils';\nimport { rehydrateError, serializeError } from './error';\nimport { BUILTIN_CODECS_REGISTERED } from './registrations';\nimport { getClassCodec } from './registry';\n// Named import of built-in registrations. Importing for side-effects only\n// (`import './registrations'`) gets tree-shaken by bundlers honoring\n// `\"sideEffects\": false` in `packages/core/package.json`. We import a value\n// and *use it* (inside `encode`) so the bundler must keep the module and\n// run its IIFE.\nimport { CODEC_TAG, MAX_REGEXP_SOURCE_LENGTH, isEnvelope } from './tags';\nimport type { Envelope } from './tags';\n\n/**\n * Encode a value into a JSON-safe shape. Non-JSON-safe types (Date, Error,\n * Map, Set, RegExp, URL, BigInt, undefined, registered classes) are wrapped\n * in tagged envelopes that the decoder can reconstruct.\n *\n * Functions and symbols are dropped (parity with JSON.stringify). Cycles are\n * replaced with null at the second visit. NaN/Infinity become null. Honors\n * user `toJSON()` methods on plain objects.\n */\nexport function encode(value: unknown): unknown {\n // Reference `BUILTIN_CODECS_REGISTERED` so bundlers (which honor\n // `\"sideEffects\": false` in package.json) cannot drop the registrations\n // module. The IIFE there runs at module evaluation, registering built-in\n // class codecs (DefaultGeneratedFile, DefaultStepResult, etc.). Without\n // this reference, those `registerClass` calls get tree-shaken from dist\n // and `instanceof` checks fail after a roundtrip across UnixSocketPubSub.\n if (!BUILTIN_CODECS_REGISTERED) {\n throw new Error('Built-in codec registrations failed to load');\n }\n return walk(value, new WeakSet());\n}\n\nfunction walk(v: unknown, seen: WeakSet): unknown {\n if (v === undefined) return { [CODEC_TAG]: 'Undefined' } satisfies Envelope;\n if (v === null) return null;\n\n const t = typeof v;\n if (t === 'string' || t === 'boolean') return v;\n if (t === 'number') return Number.isFinite(v as number) ? v : null;\n if (t === 'bigint') return { [CODEC_TAG]: 'BigInt', v: (v as bigint).toString() } satisfies Envelope;\n if (t === 'function' || t === 'symbol') return undefined;\n\n if (v instanceof Date) {\n return { [CODEC_TAG]: 'Date', v: v.toISOString() } satisfies Envelope;\n }\n if (v instanceof RegExp) {\n return { [CODEC_TAG]: 'RegExp', v: { source: v.source, flags: v.flags } } satisfies Envelope;\n }\n if (v instanceof URL) {\n return { [CODEC_TAG]: 'URL', v: v.toString() } satisfies Envelope;\n }\n if (v instanceof Error) {\n return { [CODEC_TAG]: 'Error', v: serializeError(v) } satisfies Envelope;\n }\n if (v instanceof Map) {\n if (seen.has(v)) return null;\n seen.add(v);\n const entries: Array<[unknown, unknown]> = [];\n for (const [k, val] of v.entries()) {\n entries.push([walk(k, seen), walk(val, seen)]);\n }\n return { [CODEC_TAG]: 'Map', v: entries } satisfies Envelope;\n }\n if (v instanceof Set) {\n if (seen.has(v)) return null;\n seen.add(v);\n const values: unknown[] = [];\n for (const x of v) values.push(walk(x, seen));\n return { [CODEC_TAG]: 'Set', v: values } satisfies Envelope;\n }\n\n if (Array.isArray(v)) {\n if (seen.has(v)) return null;\n seen.add(v);\n return v.map(x => walk(x, seen));\n }\n\n if (t === 'object') {\n if (seen.has(v as object)) return null;\n seen.add(v as object);\n\n // Honor toJSON() — matches JSON.stringify behavior. Skip for plain objects\n // that already carry a literal CODEC_TAG key (defensive: do not let user\n // data masquerade as an envelope through toJSON).\n const maybeToJSON = (v as { toJSON?: unknown }).toJSON;\n if (typeof maybeToJSON === 'function') {\n return walk((maybeToJSON as () => unknown).call(v), seen);\n }\n\n // Class registry lookup by exact constructor name. Falls back to plain\n // object walk for unknown classes — they decode to plain data.\n const ctor = (v as object).constructor;\n const ctorName = ctor?.name;\n if (ctorName && ctorName !== 'Object') {\n const reg = getClassCodec(ctorName);\n if (reg) {\n return {\n [CODEC_TAG]: 'Class',\n n: ctorName,\n v: walk(reg.toData(v), seen),\n } satisfies Envelope;\n }\n }\n\n const out: Record = {};\n for (const k of Object.keys(v as Record)) {\n // Skip prototype-pollution vectors.\n if (k === '__proto__') continue;\n const raw = (v as Record)[k];\n if (raw === undefined) {\n // Preserve explicit undefined keys (JSON.stringify drops them).\n out[k] = { [CODEC_TAG]: 'Undefined' } satisfies Envelope;\n continue;\n }\n const encoded = walk(raw, seen);\n if (encoded === undefined) continue; // function/symbol fields are dropped\n out[k] = encoded;\n }\n return out;\n }\n\n return v;\n}\n\n/**\n * Reconstruct a `RegExp` from a decoded envelope payload. Re-validates the\n * payload locally (independent of `isEnvelope`) so the constructor input is\n * narrowed at this single call site: bounded `source` length, spec-defined\n * flag whitelist, no duplicate flags. A malformed or hostile envelope yields\n * an empty regex (`/(?:)/`) rather than throwing, keeping frame decoding\n * resilient.\n *\n * NOTE: `source` is intentionally NOT escaped — a `RegExp` envelope's whole\n * purpose is to round-trip a pattern, so metacharacters must reach\n * `new RegExp(...)` verbatim. Safety comes from the bounded length, the\n * flag whitelist, and the `try/catch` fallback, not from escaping.\n */\nfunction decodeRegExpEnvelope(v: unknown): RegExp {\n if (!v || typeof v !== 'object') return /(?:)/;\n const candidate = v as { source?: unknown; flags?: unknown };\n if (typeof candidate.source !== 'string') return /(?:)/;\n if (typeof candidate.flags !== 'string') return /(?:)/;\n if (candidate.source.length > MAX_REGEXP_SOURCE_LENGTH) return /(?:)/;\n const flags = candidate.flags;\n if (!/^[dgimsuvy]*$/.test(flags)) return /(?:)/;\n if (new Set(flags).size !== flags.length) return /(?:)/;\n try {\n // lgtm[js/regex-injection] -- safe because of three structural gates that\n // run before this line: (1) `isEnvelope` rejects payloads whose `source`\n // exceeds `MAX_REGEXP_SOURCE_LENGTH` and whose `flags` fall outside the\n // spec flag whitelist `[dgimsuvy]` (no duplicates); (2) the local checks\n // above re-narrow `source`/`flags` so the constructor input is bounded at\n // this single call site; (3) this `try/catch` swallows any constructor\n // failure and returns the empty regex. Do NOT \"fix\" this by escaping\n // `source` — see the helper docstring above for why that would break the\n // round-trip contract.\n return new RegExp(candidate.source, flags);\n } catch {\n return /(?:)/;\n }\n}\n\n/**\n * Decode a value previously produced by `encode`. Reconstructs envelope-tagged\n * types and recursively decodes nested values. Plain objects that happen to\n * carry a `CODEC_TAG` key but do not match an envelope shape are preserved.\n */\nexport function decode(value: unknown): unknown {\n if (value === null) return null;\n if (typeof value !== 'object') return value;\n\n if (Array.isArray(value)) return value.map(decode);\n\n if (CODEC_TAG in value && isEnvelope(value)) {\n const env = value as Envelope;\n switch (env[CODEC_TAG]) {\n case 'Undefined':\n return undefined;\n case 'Date':\n return new Date(env.v);\n case 'BigInt':\n return BigInt(env.v);\n case 'RegExp':\n return decodeRegExpEnvelope(env.v);\n case 'URL':\n return new URL(env.v);\n case 'Map':\n return new Map(env.v.map(([k, val]) => [decode(k), decode(val)]));\n case 'Set':\n return new Set(env.v.map(decode));\n case 'Error':\n return rehydrateError(decodeSerializedError(env.v));\n case 'Class': {\n const reg = getClassCodec(env.n);\n const data = decode(env.v);\n return reg ? reg.fromData(data) : data;\n }\n }\n }\n\n const out: Record = {};\n for (const k of Object.keys(value as Record)) {\n if (k === '__proto__') continue;\n out[k] = decode((value as Record)[k]);\n }\n return out;\n}\n\n/**\n * Recursively decode any envelopes embedded inside a SerializedError's custom\n * fields (e.g. an error with a `details: Map` field). The top-level shape\n * stays a SerializedError so `rehydrateError` can consume it.\n */\nfunction decodeSerializedError(s: SerializedError): SerializedError {\n const decoded = decode(s) as SerializedError;\n return decoded;\n}\n","import { randomUUID } from 'node:crypto';\nimport { mkdir, open, stat, unlink } from 'node:fs/promises';\nimport type { FileHandle } from 'node:fs/promises';\nimport net from 'node:net';\nimport { dirname } from 'node:path';\n\nimport { decode, encode } from './codec';\nimport { PubSub } from './pubsub';\nimport type { PubSubDeliveryMode } from './pubsub';\nimport type { Event, EventCallback, SubscribeOptions } from './types';\n\ntype ClientFrame =\n | { type: 'subscribe'; topic: string }\n | { type: 'unsubscribe'; topic: string }\n | { type: 'publish'; topic: string; event: Omit; localOnly?: boolean }\n | { type: 'ack'; id?: string }\n | { type: 'nack'; id?: string };\n\ntype ServerFrame = { type: 'event'; topic: string; event: Event } | { type: 'subscribed'; topic: string };\n\ntype UnixSocketPubSubOptions = {\n maxRemoteClientQueuedBytes?: number;\n};\n\ntype BrokerClient = {\n socket: net.Socket;\n subscriptions: Set;\n writeChain: Promise;\n queuedBytes: number;\n};\n\ntype SubscribeWaiter = {\n resolve: () => void;\n reject: (error: Error) => void;\n};\n\nconst DEFAULT_MAX_REMOTE_CLIENT_QUEUED_BYTES = 64 * 1024 * 1024;\n\n/**\n * Max number of times a local subscriber callback may be redelivered after a\n * nack. MUST be >= the consumer-side retry budget\n * (`WorkflowEventProcessor.MAX_DELIVERY_ATTEMPTS`) — otherwise the transport\n * gives up before the consumer can exhaust its budget and surface the terminal\n * failure, which would leave the run silently hung.\n *\n * An invariant test in\n * `packages/core/src/events/unix-socket-pubsub-redelivery-budget.test.ts`\n * pins this ordering against the consumer constant so the two constants stay\n * in sync as the consumer budget changes.\n */\nexport const MAX_LOCAL_REDELIVERIES = 6;\nconst REDELIVERY_DELAY_MS = 100;\n\nfunction serializeFrame(frame: ClientFrame | ServerFrame): string {\n // Encode through the codec so non-JSON-safe values (Date, Error, Map, Set,\n // RegExp, URL, BigInt, undefined, registered classes) survive the wire\n // round-trip via tagged envelopes.\n return `${JSON.stringify(encode(frame))}\\n`;\n}\n\nfunction writeSerializedFrame(socket: net.Socket, serializedFrame: string): Promise {\n return new Promise((resolve, reject) => {\n let writeCompleted = false;\n let drainCompleted = true;\n let settled = false;\n\n const cleanup = () => {\n socket.off('error', onError);\n socket.off('close', onClose);\n socket.off('drain', onDrain);\n };\n const settle = (error?: Error) => {\n if (settled) return;\n settled = true;\n cleanup();\n if (error) {\n reject(error);\n return;\n }\n resolve();\n };\n const maybeResolve = () => {\n if (writeCompleted && drainCompleted) {\n settle();\n }\n };\n const onError = (error: Error) => settle(error);\n // NOTE: keep this exact message in sync with the transient-error classifier\n // in #sendToBroker (search for 'socket closed before write completed').\n const onClose = () => settle(new Error('UnixSocketPubSub socket closed before write completed'));\n const onDrain = () => {\n drainCompleted = true;\n maybeResolve();\n };\n\n socket.once('error', onError);\n socket.once('close', onClose);\n let drained: boolean;\n try {\n drained = socket.write(serializedFrame, error => {\n if (error) {\n settle(error);\n return;\n }\n writeCompleted = true;\n maybeResolve();\n });\n } catch (error) {\n settle(error as Error);\n return;\n }\n if (!drained) {\n drainCompleted = false;\n socket.once('drain', onDrain);\n }\n });\n}\n\nfunction writeFrame(socket: net.Socket, frame: ClientFrame | ServerFrame): Promise {\n return writeSerializedFrame(socket, serializeFrame(frame));\n}\n\nfunction nextTick(): Promise {\n return new Promise(resolve => setImmediate(resolve));\n}\n\nfunction readFrames(socket: net.Socket, onFrame: (frame: any) => void) {\n let buffer = '';\n socket.setEncoding('utf8');\n socket.on('data', chunk => {\n buffer += chunk;\n while (true) {\n const newlineIndex = buffer.indexOf('\\n');\n if (newlineIndex === -1) break;\n const line = buffer.slice(0, newlineIndex);\n buffer = buffer.slice(newlineIndex + 1);\n if (!line.trim()) continue;\n try {\n onFrame(decode(JSON.parse(line)));\n } catch {\n // Ignore malformed frames. The transport is local IPC and callers can retry.\n }\n }\n });\n}\n\nexport class UnixSocketPubSub extends PubSub {\n readonly socketPath: string;\n #server?: net.Server;\n #clientSocket?: net.Socket;\n #isBroker = false;\n #closed = false;\n #starting?: Promise;\n #callbacks = new Map>();\n #subscribeWaiters = new Map();\n #brokerClients = new Map();\n #pendingWrites = new Set>();\n #recovering?: Promise;\n #maxRemoteClientQueuedBytes: number;\n\n constructor(socketPath: string, options: UnixSocketPubSubOptions = {}) {\n super();\n this.socketPath = socketPath;\n this.#maxRemoteClientQueuedBytes = options.maxRemoteClientQueuedBytes ?? DEFAULT_MAX_REMOTE_CLIENT_QUEUED_BYTES;\n }\n\n override get supportedModes(): ReadonlyArray {\n return ['push'];\n }\n\n get isBroker(): boolean {\n return this.#isBroker;\n }\n\n /** Number of remote clients currently connected to this broker. Always 0 for non-broker instances. */\n get remoteClientCount(): number {\n return this.#isBroker ? this.#brokerClients.size : 0;\n }\n\n async publish(\n topic: string,\n event: Omit,\n options?: { localOnly?: boolean },\n ): Promise {\n await this.#ensureStarted();\n\n // `localOnly` events stay entirely within the publishing process. They are\n // never serialized over a unix socket, so live methods on payload values\n // (e.g. `MastraModelOutput.getFullOutput`, `step.condition` functions on\n // serialized step graphs) survive intact. This is the semantic the agent's\n // execution-workflow relies on: the run result is delivered via\n // `workflows-finish` and includes the `MastraModelOutput` instance —\n // round-tripping it through the broker would strip its methods.\n if (options?.localOnly) {\n const localEvent: Event = {\n ...event,\n id: randomUUID(),\n createdAt: new Date(),\n deliveryAttempt: 1,\n };\n this.#deliverLocal(topic, localEvent);\n return;\n }\n\n if (this.#isBroker) {\n await this.#publishFromBroker(topic, event, undefined, options?.localOnly);\n return;\n }\n\n const socket = this.#clientSocket;\n if (!socket || socket.destroyed) {\n await this.#ensureStarted(true);\n }\n await this.#sendToBroker({ type: 'publish', topic, event, localOnly: options?.localOnly });\n }\n\n async subscribe(topic: string, cb: EventCallback, options?: SubscribeOptions): Promise {\n if (options?.group) {\n throw new Error('UnixSocketPubSub does not support grouped subscriptions yet');\n }\n\n const callbacks = this.#callbacks.get(topic) ?? new Set();\n const hadCallback = callbacks.has(cb);\n const wasConnected = Boolean(this.#clientSocket && !this.#clientSocket.destroyed);\n callbacks.add(cb);\n this.#callbacks.set(topic, callbacks);\n\n try {\n await this.#ensureStarted();\n if (!this.#isBroker && !hadCallback && wasConnected) {\n await this.#sendSubscribeToBroker(topic);\n }\n } catch (error) {\n if (!hadCallback) {\n callbacks.delete(cb);\n if (callbacks.size === 0) {\n this.#callbacks.delete(topic);\n }\n }\n throw error;\n }\n }\n\n async unsubscribe(topic: string, cb: EventCallback): Promise {\n const callbacks = this.#callbacks.get(topic);\n callbacks?.delete(cb);\n if (callbacks?.size === 0) {\n this.#callbacks.delete(topic);\n if (!this.#isBroker && this.#clientSocket && !this.#clientSocket.destroyed) {\n await this.#sendToBroker({ type: 'unsubscribe', topic });\n await nextTick();\n }\n }\n }\n\n async flush(): Promise {\n await Promise.allSettled([...this.#pendingWrites]);\n }\n\n async close(): Promise {\n this.#closed = true;\n this.#callbacks.clear();\n\n this.#clientSocket?.destroy();\n this.#clientSocket = undefined;\n this.#rejectSubscribeWaiters(new Error('UnixSocketPubSub is closed'));\n\n for (const client of [...this.#brokerClients.values()]) {\n this.#removeBrokerClient(client);\n }\n\n if (this.#server) {\n await new Promise(resolve => this.#server?.close(() => resolve()));\n this.#server = undefined;\n }\n\n if (this.#isBroker) {\n await unlink(this.socketPath).catch(() => {});\n }\n this.#isBroker = false;\n }\n\n async #ensureStarted(forceReconnect = false): Promise {\n if (this.#closed) {\n throw new Error('UnixSocketPubSub is closed');\n }\n if (!forceReconnect && (this.#isBroker || (this.#clientSocket && !this.#clientSocket.destroyed))) {\n return;\n }\n if (this.#starting) {\n return this.#starting;\n }\n\n this.#starting = this.#start(forceReconnect).finally(() => {\n this.#starting = undefined;\n });\n return this.#starting;\n }\n\n async #start(forceReconnect: boolean): Promise {\n if (forceReconnect) {\n this.#clientSocket?.destroy();\n this.#clientSocket = undefined;\n this.#isBroker = false;\n }\n\n this.#throwIfClosed();\n await mkdir(dirname(this.socketPath), { recursive: true });\n this.#throwIfClosed();\n\n try {\n await this.#listen();\n this.#throwIfClosed();\n this.#isBroker = true;\n return;\n } catch (error) {\n if (this.#closed) {\n await this.close();\n throw new Error('UnixSocketPubSub is closed');\n }\n const code = (error as NodeJS.ErrnoException).code;\n // EADDRINUSE: another broker bound the socket. EEXIST: another process\n // created the socket file but hasn't bound yet (macOS race). Both mean\n // \"fall through and try to connect as a client\".\n if (code !== 'EADDRINUSE' && code !== 'EEXIST') throw error;\n }\n\n try {\n await this.#connectClient();\n this.#throwIfClosed();\n } catch (error) {\n if (this.#closed) {\n await this.close();\n throw new Error('UnixSocketPubSub is closed');\n }\n const code = (error as NodeJS.ErrnoException).code;\n if (code === 'ECONNREFUSED' || code === 'ENOENT' || code === 'ENOTSOCK') {\n this.#throwIfClosed();\n await this.#electBroker();\n return;\n }\n throw error;\n }\n }\n\n #throwIfClosed() {\n if (this.#closed) {\n throw new Error('UnixSocketPubSub is closed');\n }\n }\n\n #listen(): Promise {\n return new Promise((resolve, reject) => {\n const server = net.createServer(socket => this.#handleBrokerClient(socket));\n const onError = (error: Error) => {\n server.off('listening', onListening);\n reject(error);\n };\n const onListening = () => {\n server.off('error', onError);\n this.#server = server;\n resolve();\n };\n\n server.once('error', onError);\n server.once('listening', onListening);\n server.listen(this.socketPath);\n });\n }\n\n #connectClient(): Promise {\n return new Promise((resolve, reject) => {\n const socket = net.createConnection(this.socketPath);\n const onError = (error: Error) => {\n socket.off('connect', onConnect);\n reject(error);\n };\n const onConnect = () => {\n socket.off('error', onError);\n this.#clientSocket = socket;\n this.#isBroker = false;\n readFrames(socket, frame => this.#handleServerFrame(frame));\n // NOTE: keep this exact message in sync with the transient-error\n // classifier in #sendToBroker (search for 'broker connection closed').\n socket.on('close', () =>\n this.#handleClientDisconnect(socket, new Error('UnixSocketPubSub broker connection closed')),\n );\n socket.on('error', error => this.#handleClientDisconnect(socket, error));\n void this.#resubscribeClient().then(resolve, reject);\n };\n\n socket.once('error', onError);\n socket.once('connect', onConnect);\n });\n }\n\n async #resubscribeClient() {\n for (const topic of this.#callbacks.keys()) {\n await this.#sendSubscribeToBroker(topic);\n }\n }\n\n #handleClientDisconnect(socket: net.Socket, error: Error) {\n if (this.#clientSocket !== socket) return;\n this.#clientSocket = undefined;\n this.#rejectSubscribeWaiters(error);\n if (!this.#closed) {\n void this.#recoverClientConnection();\n }\n }\n\n async #recoverClientConnection(): Promise {\n if (this.#recovering) return this.#recovering;\n this.#recovering = this.#recoverClientConnectionLoop().finally(() => {\n this.#recovering = undefined;\n });\n return this.#recovering;\n }\n\n async #recoverClientConnectionLoop(): Promise {\n while (!this.#closed && !this.#isBroker && !(this.#clientSocket && !this.#clientSocket.destroyed)) {\n try {\n await this.#ensureStarted(true);\n return;\n } catch {\n if (this.#closed) return;\n await new Promise(resolve => setTimeout(resolve, 10));\n }\n }\n }\n\n /**\n * Serializes broker election across processes using an exclusive lock file.\n * Only the lock winner unlinks the stale socket and listens; losers wait\n * then connect as clients to the newly elected broker.\n */\n async #electBroker(): Promise {\n const lockPath = this.socketPath + '.elect';\n let lockFd: FileHandle | undefined;\n try {\n lockFd = await open(lockPath, 'wx');\n } catch (e) {\n if ((e as NodeJS.ErrnoException).code === 'EEXIST') {\n if (await this.#isElectionLockStale(lockPath)) {\n await unlink(lockPath).catch(() => {});\n throw new Error('Stale broker election lock removed');\n }\n await new Promise(resolve => setTimeout(resolve, 150));\n try {\n await this.#connectClient();\n this.#throwIfClosed();\n return;\n } catch {\n throw new Error('Broker election in progress by another process');\n }\n }\n throw e;\n }\n\n try {\n // Re-check: a previous election round may have installed a broker\n // between our initial connectClient() and acquiring this lock.\n try {\n await this.#connectClient();\n this.#throwIfClosed();\n return;\n } catch {\n // Still no live broker — proceed with election.\n }\n await unlink(this.socketPath).catch(() => {});\n this.#throwIfClosed();\n await this.#listen();\n this.#throwIfClosed();\n this.#isBroker = true;\n } finally {\n await lockFd.close().catch(() => {});\n await unlink(lockPath).catch(() => {});\n }\n }\n\n async #isElectionLockStale(lockPath: string): Promise {\n try {\n const lockStat = await stat(lockPath);\n return Date.now() - lockStat.mtimeMs > 2000;\n } catch {\n return true;\n }\n }\n\n async #sendSubscribeToBroker(topic: string): Promise {\n let waiter: SubscribeWaiter | undefined;\n const subscribed = new Promise((resolve, reject) => {\n waiter = { resolve, reject };\n const waiters = this.#subscribeWaiters.get(topic) ?? [];\n waiters.push(waiter);\n this.#subscribeWaiters.set(topic, waiters);\n });\n try {\n await this.#sendToBroker({ type: 'subscribe', topic });\n } catch (error) {\n this.#removeSubscribeWaiter(topic, waiter);\n throw error;\n }\n await subscribed;\n }\n\n #removeSubscribeWaiter(topic: string, waiter: SubscribeWaiter | undefined) {\n if (!waiter) return;\n const waiters = this.#subscribeWaiters.get(topic);\n if (!waiters) return;\n const nextWaiters = waiters.filter(item => item !== waiter);\n if (nextWaiters.length === 0) {\n this.#subscribeWaiters.delete(topic);\n return;\n }\n this.#subscribeWaiters.set(topic, nextWaiters);\n }\n\n #settleSubscribeWaiters(topic: string, error?: Error) {\n const waiters = this.#subscribeWaiters.get(topic);\n this.#subscribeWaiters.delete(topic);\n if (error) {\n waiters?.forEach(waiter => waiter.reject(error));\n return;\n }\n waiters?.forEach(waiter => waiter.resolve());\n }\n\n #rejectSubscribeWaiters(error: Error) {\n for (const topic of this.#subscribeWaiters.keys()) {\n this.#settleSubscribeWaiters(topic, error);\n }\n }\n\n #handleBrokerClient(socket: net.Socket) {\n const client: BrokerClient = {\n socket,\n subscriptions: new Set(),\n writeChain: Promise.resolve(),\n queuedBytes: 0,\n };\n this.#brokerClients.set(socket, client);\n readFrames(socket, frame => {\n const clientFrame = frame as ClientFrame;\n if (clientFrame.type === 'subscribe') {\n client.subscriptions.add(clientFrame.topic);\n this.#enqueueBrokerClientWrite(client, { type: 'subscribed', topic: clientFrame.topic });\n } else if (clientFrame.type === 'unsubscribe') {\n client.subscriptions.delete(clientFrame.topic);\n } else if (clientFrame.type === 'publish') {\n void this.#publishFromBroker(clientFrame.topic, clientFrame.event, client, clientFrame.localOnly);\n }\n });\n socket.on('close', () => this.#removeBrokerClient(client));\n socket.on('error', () => this.#removeBrokerClient(client));\n }\n\n #enqueueBrokerClientWrite(client: BrokerClient, frame: ServerFrame) {\n if (this.#brokerClients.get(client.socket) !== client || client.socket.destroyed) return;\n\n const serializedFrame = serializeFrame(frame);\n const queuedBytes = Buffer.byteLength(serializedFrame);\n if (client.queuedBytes + queuedBytes > this.#maxRemoteClientQueuedBytes) {\n this.#removeBrokerClient(client);\n return;\n }\n\n client.queuedBytes += queuedBytes;\n\n const write = client.writeChain\n .catch(() => {})\n .then(async () => {\n if (this.#brokerClients.get(client.socket) !== client || client.socket.destroyed) return;\n await writeSerializedFrame(client.socket, serializedFrame);\n })\n .catch(() => {\n this.#removeBrokerClient(client);\n })\n .finally(() => {\n client.queuedBytes = Math.max(0, client.queuedBytes - queuedBytes);\n });\n\n client.writeChain = write;\n this.#pendingWrites.add(write);\n void write.finally(() => this.#pendingWrites.delete(write));\n }\n\n #removeBrokerClient(client: BrokerClient) {\n if (this.#brokerClients.get(client.socket) !== client) return;\n this.#brokerClients.delete(client.socket);\n client.subscriptions.clear();\n client.queuedBytes = 0;\n client.writeChain = Promise.resolve();\n if (!client.socket.destroyed) {\n client.socket.destroy();\n }\n }\n\n #handleServerFrame(frame: ServerFrame) {\n if (frame.type === 'subscribed') {\n this.#settleSubscribeWaiters(frame.topic);\n return;\n }\n if (frame.type !== 'event') return;\n // `createdAt` is already a Date — the codec rehydrates it during JSON.parse\n // in `readFrames`. No ad-hoc conversion needed.\n this.#deliverLocal(frame.topic, frame.event);\n }\n\n async #publishFromBroker(\n topic: string,\n event: Omit,\n sourceClient?: BrokerClient,\n localOnly?: boolean,\n ) {\n const brokerEvent: Event = {\n ...event,\n id: randomUUID(),\n createdAt: new Date(),\n deliveryAttempt: 1,\n };\n\n this.#deliverLocal(topic, brokerEvent);\n\n // Skip serialization entirely when no remote clients could receive the event.\n if (this.#brokerClients.size === 0) return;\n\n // `localOnly` events are scoped to the publishing instance.\n // When the publisher is the broker, the `#deliverLocal` above is enough.\n // When the publisher is a remote client, relay the event back ONLY to\n // that client so its subscription callback fires, but do NOT fan out to\n // other clients — their WEP would just drop the event via `#ownsWorkflow`\n // and the multi-MB payload would waste socket/kernel buffer for nothing.\n if (localOnly) {\n if (sourceClient && sourceClient.subscriptions.has(topic) && !sourceClient.socket.destroyed) {\n this.#enqueueBrokerClientWrite(sourceClient, { type: 'event', topic, event: brokerEvent });\n }\n return;\n }\n\n let frame: ServerFrame | undefined;\n for (const client of this.#brokerClients.values()) {\n if (!client.subscriptions.has(topic) || client.socket.destroyed) continue;\n // Lazily build the frame only when we know at least one client needs it.\n frame ??= { type: 'event', topic, event: brokerEvent };\n this.#enqueueBrokerClientWrite(client, frame);\n }\n }\n\n #deliverLocal(topic: string, event: Event) {\n const callbacks = this.#callbacks.get(topic);\n if (!callbacks) return;\n for (const cb of callbacks) {\n this.#invokeLocalCallback(topic, event, cb, 0);\n }\n }\n\n #invokeLocalCallback(topic: string, event: Event, cb: EventCallback, attempt: number) {\n let nacked = false;\n const nack = async () => {\n if (nacked || this.#closed) return;\n nacked = true;\n if (attempt >= MAX_LOCAL_REDELIVERIES) return;\n const stillSubscribed = this.#callbacks.get(topic)?.has(cb);\n if (!stillSubscribed) return;\n const timer = setTimeout(\n () => {\n if (this.#closed) return;\n if (!this.#callbacks.get(topic)?.has(cb)) return;\n const redeliveredEvent: Event = {\n ...event,\n deliveryAttempt: (event.deliveryAttempt ?? 1) + 1,\n };\n this.#invokeLocalCallback(topic, redeliveredEvent, cb, attempt + 1);\n },\n REDELIVERY_DELAY_MS * (attempt + 1),\n );\n // Unrefed so a queued redelivery never holds the event loop open at\n // shutdown. The trade-off: an in-flight redelivery during process exit\n // is silently dropped. That's acceptable because the consumer (WEP)\n // is itself shutting down and the workflow will be re-driven from\n // durable state on the next start.\n timer.unref?.();\n };\n try {\n const result = (cb as (event: Event, ack: () => Promise, nack: () => Promise) => unknown)(\n event,\n async () => {},\n nack,\n );\n if (result && typeof (result as Promise).catch === 'function') {\n void (result as Promise).catch(() => {});\n }\n } catch {\n // Ignore subscriber failures so one callback cannot poison topic delivery.\n }\n }\n\n async #sendToBroker(frame: ClientFrame) {\n // If the broker died mid-write (EPIPE) or while election is rotating, we\n // reconnect and retry. The first attempt is the normal path. Each retry\n // forces a fresh broker resolution. Retry budget is bounded so a truly\n // unreachable broker still errors instead of looping forever.\n const maxRetries = 3;\n let lastError: unknown;\n for (let attempt = 0; attempt <= maxRetries; attempt++) {\n try {\n if (attempt === 0) {\n await this.#sendToActiveBroker(frame);\n } else {\n if (this.#closed) throw lastError;\n const failedSocket = this.#clientSocket;\n this.#clientSocket = undefined;\n failedSocket?.destroy();\n await this.#ensureStarted(true);\n await this.#sendToActiveBroker(frame);\n }\n return;\n } catch (error) {\n lastError = error;\n if (this.#closed) throw error;\n const code = (error as NodeJS.ErrnoException)?.code;\n // EPIPE/ECONNRESET/ENOTCONN: broker died mid-write — retry against a\n // fresh broker. Anything else (e.g. closed pubsub, validation error)\n // is not safe to retry blindly. The string-message checks cover three\n // internal errors thrown from within this file that don't carry an\n // ErrnoException-style `code` — keep them in lockstep with those\n // throw sites:\n // - \"socket closed before write completed\" (writeSerializedFrame,\n // when the broker dies mid-write before the drain settles)\n // - \"broker connection closed\" (#handleClientDisconnect)\n // - \"not connected to a broker\" (#sendToActiveBroker)\n const transient =\n code === 'EPIPE' ||\n code === 'ECONNRESET' ||\n code === 'ENOTCONN' ||\n (error as Error)?.message?.includes('socket closed before write completed') ||\n (error as Error)?.message?.includes('broker connection closed') ||\n (error as Error)?.message?.includes('not connected to a broker');\n if (!transient || attempt === maxRetries) throw error;\n // Tiny backoff so concurrent senders don't dogpile re-election.\n await new Promise(resolve => setTimeout(resolve, 10 * (attempt + 1)));\n }\n }\n }\n\n async #sendToActiveBroker(frame: ClientFrame) {\n const socket = this.#clientSocket;\n if (!socket || socket.destroyed) {\n await this.#ensureStarted(true);\n }\n if (this.#isBroker) {\n await this.#handlePromotedBrokerFrame(frame);\n return;\n }\n const activeSocket = this.#clientSocket;\n if (!activeSocket || activeSocket.destroyed) {\n // NOTE: keep this exact message in sync with the transient-error\n // classifier in #sendToBroker (search for 'not connected to a broker').\n throw new Error('UnixSocketPubSub is not connected to a broker');\n }\n await writeFrame(activeSocket, frame);\n }\n\n async #handlePromotedBrokerFrame(frame: ClientFrame) {\n if (frame.type === 'subscribe') {\n this.#settleSubscribeWaiters(frame.topic);\n } else if (frame.type === 'publish') {\n await this.#publishFromBroker(frame.topic, frame.event);\n }\n }\n}\n"]}