msw/lib/core/sse.mjs.map

Seamless REST/GraphQL API mocking library for browser and Node.js.

{"version":3,"sources":["../../src/core/sse.ts"],"sourcesContent":["import { invariant } from 'outvariant'\nimport { Emitter } from 'strict-event-emitter'\nimport type { ResponseResolver } from './handlers/RequestHandler'\nimport {\n  HttpHandler,\n  type HttpRequestResolverExtras,\n  type HttpRequestParsedResult,\n} from './handlers/HttpHandler'\nimport type { Path, PathParams } from './utils/matching/matchRequestUrl'\nimport { delay } from './delay'\nimport { getTimestamp } from './utils/logging/getTimestamp'\nimport { devUtils } from './utils/internal/devUtils'\nimport { colors } from './ws/utils/attachWebSocketLogger'\nimport { toPublicUrl } from './utils/request/toPublicUrl'\n\ntype EventMapConstraint = {\n  message?: unknown\n  [key: string]: unknown\n  [key: symbol | number]: never\n}\n\nexport type ServerSentEventResolverExtras<\n  EventMap extends EventMapConstraint,\n  Params extends PathParams,\n> = HttpRequestResolverExtras<Params> & {\n  client: ServerSentEventClient<EventMap>\n  server: ServerSentEventServer\n}\n\nexport type ServerSentEventResolver<\n  EventMap extends EventMapConstraint,\n  Params extends PathParams,\n> = ResponseResolver<ServerSentEventResolverExtras<EventMap, Params>, any, any>\n\nexport type ServerSentEventRequestHandler = <\n  EventMap extends EventMapConstraint = { message: unknown },\n  Params extends PathParams<keyof Params> = PathParams,\n  RequestPath extends Path = Path,\n>(\n  path: RequestPath,\n  resolver: ServerSentEventResolver<EventMap, Params>,\n) => HttpHandler\n\nexport type ServerSentEventMessage<\n  EventMap extends EventMapConstraint = { message: unknown },\n> =\n  | ToEventDiscriminatedUnion<EventMap & { message: unknown }>\n  | {\n      id?: never\n      event?: never\n      data?: never\n      retry: number\n    }\n\n/**\n * Intercept Server-Sent Events (SSE).\n *\n * @example\n * sse('http://localhost:4321', ({ client }) => {\n *   client.send({ data: 'hello world' })\n * })\n *\n * @see {@link https://mswjs.io/docs/sse/ Mocking Server-Sent Events}\n * @see {@link https://mswjs.io/docs/api/sse `sse()` API reference}\n */\nexport const sse: ServerSentEventRequestHandler = (path, resolver) => {\n  return new ServerSentEventHandler(path, resolver)\n}\n\nclass ServerSentEventHandler<\n  EventMap extends EventMapConstraint,\n> extends HttpHandler {\n  constructor(path: Path, resolver: ServerSentEventResolver<EventMap, any>) {\n    invariant(\n      typeof EventSource !== 'undefined',\n      'Failed to construct a Server-Sent Event handler for path \"%s\": the EventSource API is not supported in this environment',\n      path,\n    )\n\n    const clientEmitter = new Emitter<ServerSentEventClientEventMap>()\n\n    super('GET', path, async (info) => {\n      const responseInit: ResponseInit = {\n        headers: {\n          'content-type': 'text/event-stream',\n          'cache-control': 'no-cache',\n          connection: 'keep-alive',\n        },\n      }\n\n      /**\n       * @note Log the intercepted request early.\n       * Normally, the `this.log()` method is called when the handler returns a response.\n       * For SSE, call that method earlier so the logs are in correct order.\n       */\n      await super.log({\n        request: info.request,\n        /**\n         * @note Construct a placeholder response since SSE response\n         * is being streamed and cannot be cloned/consumed for logging.\n         */\n        response: new Response('[streaming]', responseInit),\n      })\n      this.#attachClientLogger(info.request, clientEmitter)\n\n      const stream = new ReadableStream({\n        async start(controller) {\n          const client = new ServerSentEventClient<EventMap>({\n            controller,\n            emitter: clientEmitter,\n          })\n          const server = new ServerSentEventServer({\n            request: info.request,\n            client,\n          })\n\n          await resolver({\n            ...info,\n            client,\n            server,\n          })\n        },\n      })\n\n      return new Response(stream, responseInit)\n    })\n  }\n\n  async predicate(args: {\n    request: Request\n    parsedResult: HttpRequestParsedResult\n  }) {\n    if (args.request.headers.get('accept') !== 'text/event-stream') {\n      return false\n    }\n\n    return super.predicate(args)\n  }\n\n  async log(_args: { request: Request; response: Response }): Promise<void> {\n    /**\n     * @note Skip the default `this.log()` logic so that when this handler is logged\n     * upon handling the request, nothing is printed (we log SSE requests early).\n     */\n    return\n  }\n\n  #attachClientLogger(\n    request: Request,\n    emitter: Emitter<ServerSentEventClientEventMap>,\n  ): void {\n    const publicUrl = toPublicUrl(request.url)\n\n    /* eslint-disable no-console */\n    emitter.on('message', (payload) => {\n      console.groupCollapsed(\n        devUtils.formatMessage(\n          `${getTimestamp()} SSE %s %c⇣%c ${payload.event}`,\n        ),\n        publicUrl,\n        `color:${colors.mocked}`,\n        'color:inherit',\n      )\n      console.log(payload.frames)\n      console.groupEnd()\n    })\n\n    emitter.on('error', () => {\n      console.groupCollapsed(\n        devUtils.formatMessage(`${getTimestamp()} SSE %s %c\\u00D7%c error`),\n        publicUrl,\n        `color: ${colors.system}`,\n        'color:inherit',\n      )\n      console.log('Handler:', this)\n      console.groupEnd()\n    })\n\n    emitter.on('close', () => {\n      console.groupCollapsed(\n        devUtils.formatMessage(`${getTimestamp()} SSE %s %c■%c close`),\n        publicUrl,\n        `colors:${colors.system}`,\n        'color:inherit',\n      )\n      console.log('Handler:', this)\n      console.groupEnd()\n    })\n    /* eslint-enable no-console */\n  }\n}\n\ntype Values<T> = T[keyof T]\ntype Identity<T> = { [K in keyof T]: T[K] } & unknown\ntype ToEventDiscriminatedUnion<T> = Values<{\n  [K in keyof T]: Identity<\n    (K extends 'message'\n      ? {\n          id?: string\n          event?: K\n          data?: T[K]\n          retry?: never\n        }\n      : {\n          id?: string\n          event: K\n          data?: T[K]\n          retry?: never\n        }) &\n      // Make the `data` field conditionally required through an intersection.\n      (undefined extends T[K] ? unknown : { data: unknown })\n  >\n}>\n\ntype ServerSentEventClientEventMap = {\n  message: [\n    payload: {\n      id?: string\n      event: string\n      data?: unknown\n      frames: Array<string>\n    },\n  ]\n  error: []\n  close: []\n}\n\nclass ServerSentEventClient<\n  EventMap extends EventMapConstraint = { message: unknown },\n> {\n  #encoder: TextEncoder\n  #controller: ReadableStreamDefaultController\n  #emitter: Emitter<ServerSentEventClientEventMap>\n\n  constructor(args: {\n    controller: ReadableStreamDefaultController\n    emitter: Emitter<ServerSentEventClientEventMap>\n  }) {\n    this.#encoder = new TextEncoder()\n    this.#controller = args.controller\n    this.#emitter = args.emitter\n  }\n\n  /**\n   * Sends the given payload to the intercepted `EventSource`.\n   */\n  public send(payload: ServerSentEventMessage<EventMap>): void {\n    if ('retry' in payload && payload.retry != null) {\n      this.#sendRetry(payload.retry)\n      return\n    }\n\n    this.#sendMessage({\n      id: payload.id,\n      event: payload.event,\n      data:\n        typeof payload.data === 'object'\n          ? JSON.stringify(payload.data)\n          : payload.data,\n    })\n  }\n\n  /**\n   * Dispatches the given event on the intercepted `EventSource`.\n   */\n  public dispatchEvent(event: Event) {\n    if (event instanceof MessageEvent) {\n      /**\n       * @note Use the internal send mechanism to skip normalization\n       * of the message data (already normalized by the server).\n       */\n      this.#sendMessage({\n        id: event.lastEventId || undefined,\n        event: event.type === 'message' ? undefined : event.type,\n        data: event.data,\n      })\n      return\n    }\n\n    if (event.type === 'error') {\n      this.error()\n      return\n    }\n\n    if (event.type === 'close') {\n      this.close()\n      return\n    }\n  }\n\n  /**\n   * Errors the underlying `EventSource`, closing the connection with an error.\n   * This is equivalent to aborting the connection and will produce a `TypeError: Failed to fetch`\n   * error.\n   */\n  public error(): void {\n    this.#controller.error()\n    this.#emitter.emit('error')\n  }\n\n  /**\n   * Closes the underlying `EventSource`, closing the connection.\n   */\n  public close(): void {\n    this.#controller.close()\n    this.#emitter.emit('close')\n  }\n\n  #sendRetry(retry: number): void {\n    if (typeof retry === 'number') {\n      this.#controller.enqueue(this.#encoder.encode(`retry:${retry}\\n\\n`))\n    }\n  }\n\n  #sendMessage(message: {\n    id?: string\n    event?: unknown\n    data: unknown | undefined\n  }): void {\n    const frames: Array<string> = []\n\n    if (message.id) {\n      frames.push(`id:${message.id}`)\n    }\n\n    if (message.event) {\n      frames.push(`event:${message.event?.toString()}`)\n    }\n\n    frames.push(`data:${message.data}`)\n    frames.push('', '')\n\n    this.#controller.enqueue(this.#encoder.encode(frames.join('\\n')))\n\n    this.#emitter.emit('message', {\n      id: message.id,\n      event: message.event?.toString() || 'message',\n      data: message.data,\n      frames,\n    })\n  }\n}\n\nclass ServerSentEventServer {\n  #request: Request\n  #client: ServerSentEventClient<ServerSentEventClientEventMap>\n\n  constructor(args: { request: Request; client: ServerSentEventClient<any> }) {\n    this.#request = args.request\n    this.#client = args.client\n  }\n\n  /**\n   * Establishes the actual connection for this SSE request\n   * and returns the `EventSource` instance.\n   */\n  public connect(): EventSource {\n    const source = new ObservableEventSource(this.#request.url, {\n      withCredentials: this.#request.credentials === 'include',\n      headers: {\n        /**\n         * @note Mark this request as passthrough so it doesn't trigger\n         * an infinite loop matching against the existing request handler.\n         */\n        accept: 'msw/passthrough',\n      },\n    })\n\n    source[kOnAnyMessage] = (event) => {\n      Object.defineProperties(event, {\n        target: {\n          value: this,\n          enumerable: true,\n          writable: true,\n          configurable: true,\n        },\n      })\n\n      // Schedule the server-to-client forwarding for the next tick\n      // so the user can prevent the message event.\n      queueMicrotask(() => {\n        if (!event.defaultPrevented) {\n          this.#client.dispatchEvent(event)\n        }\n      })\n    }\n\n    // Forward stream errors from the actual server to the client.\n    source.addEventListener('error', (event) => {\n      Object.defineProperties(event, {\n        target: {\n          value: this,\n          enumerable: true,\n          writable: true,\n          configurable: true,\n        },\n      })\n\n      queueMicrotask(() => {\n        // Allow the user to opt-out from this forwarding.\n        if (!event.defaultPrevented) {\n          this.#client.dispatchEvent(event)\n        }\n      })\n    })\n\n    return source\n  }\n}\n\ninterface ObservableEventSourceInit extends EventSourceInit {\n  headers?: HeadersInit\n}\n\ntype EventHandler<EventType extends Event> = (\n  this: EventSource,\n  event: EventType,\n) => any\n\nconst kRequest = Symbol('kRequest')\nconst kReconnectionTime = Symbol('kReconnectionTime')\nconst kLastEventId = Symbol('kLastEventId')\nconst kAbortController = Symbol('kAbortController')\nconst kOnOpen = Symbol('kOnOpen')\nconst kOnMessage = Symbol('kOnMessage')\nconst kOnAnyMessage = Symbol('kOnAnyMessage')\nconst kOnError = Symbol('kOnError')\n\nclass ObservableEventSource extends EventTarget implements EventSource {\n  static readonly CONNECTING = 0\n  static readonly OPEN = 1\n  static readonly CLOSED = 2\n\n  public readonly CONNECTING = ObservableEventSource.CONNECTING\n  public readonly OPEN = ObservableEventSource.OPEN\n  public readonly CLOSED = ObservableEventSource.CLOSED\n\n  public readyState: number\n  public url: string\n  public withCredentials: boolean\n\n  private [kRequest]: Request\n  private [kReconnectionTime]: number\n  private [kLastEventId]: string\n  private [kAbortController]: AbortController\n  private [kOnOpen]: EventHandler<Event> | null = null\n  private [kOnMessage]: EventHandler<MessageEvent> | null = null\n  private [kOnAnyMessage]: EventHandler<MessageEvent> | null = null\n  private [kOnError]: EventHandler<Event> | null = null\n\n  constructor(url: string | URL, init?: ObservableEventSourceInit) {\n    super()\n\n    this.url = new URL(url).href\n    this.withCredentials = init?.withCredentials ?? false\n\n    this.readyState = this.CONNECTING\n\n    // Support custom request init.\n    const headers = new Headers(init?.headers || {})\n    headers.append('accept', 'text/event-stream')\n\n    this[kAbortController] = new AbortController()\n    this[kReconnectionTime] = 2000\n    this[kLastEventId] = ''\n    this[kRequest] = new Request(this.url, {\n      method: 'GET',\n      headers,\n      credentials: this.withCredentials ? 'include' : 'omit',\n      signal: this[kAbortController].signal,\n    })\n\n    this.connect()\n  }\n\n  get onopen(): EventHandler<Event> | null {\n    return this[kOnOpen]\n  }\n\n  set onopen(handler: EventHandler<Event>) {\n    if (this[kOnOpen]) {\n      this.removeEventListener('open', this[kOnOpen])\n    }\n    this[kOnOpen] = handler.bind(this)\n    this.addEventListener('open', this[kOnOpen])\n  }\n\n  get onmessage(): EventHandler<MessageEvent> | null {\n    return this[kOnMessage]\n  }\n  set onmessage(handler: EventHandler<MessageEvent>) {\n    if (this[kOnMessage]) {\n      this.removeEventListener('message', { handleEvent: this[kOnMessage] })\n    }\n    this[kOnMessage] = handler.bind(this)\n    this.addEventListener('message', { handleEvent: this[kOnMessage] })\n  }\n\n  get onerror(): EventHandler<Event> | null {\n    return this[kOnError]\n  }\n  set oneerror(handler: EventHandler<Event>) {\n    if (this[kOnError]) {\n      this.removeEventListener('error', { handleEvent: this[kOnError] })\n    }\n    this[kOnError] = handler.bind(this)\n    this.addEventListener('error', { handleEvent: this[kOnError] })\n  }\n\n  public addEventListener<K extends keyof EventSourceEventMap>(\n    type: K,\n    listener: EventHandler<EventSourceEventMap[K]>,\n    options?: boolean | AddEventListenerOptions,\n  ): void\n  public addEventListener(\n    type: string,\n    listener: EventHandler<MessageEvent>,\n    options?: boolean | AddEventListenerOptions,\n  ): void\n  public addEventListener(\n    type: string,\n    listener: EventListenerOrEventListenerObject,\n    options?: boolean | AddEventListenerOptions,\n  ): void\n\n  public addEventListener(\n    type: string,\n    listener: EventHandler<MessageEvent> | EventListenerOrEventListenerObject,\n    options?: boolean | AddEventListenerOptions,\n  ): void {\n    super.addEventListener(\n      type,\n      listener as EventListenerOrEventListenerObject,\n      options,\n    )\n  }\n\n  public removeEventListener<K extends keyof EventSourceEventMap>(\n    type: K,\n    listener: (this: EventSource, ev: EventSourceEventMap[K]) => any,\n    options?: boolean | EventListenerOptions,\n  ): void\n  public removeEventListener(\n    type: string,\n    listener: (this: EventSource, event: MessageEvent) => any,\n    options?: boolean | EventListenerOptions,\n  ): void\n  public removeEventListener(\n    type: string,\n    listener: EventListenerOrEventListenerObject,\n    options?: boolean | EventListenerOptions,\n  ): void\n\n  public removeEventListener(\n    type: string,\n    listener: EventHandler<MessageEvent> | EventListenerOrEventListenerObject,\n    options?: boolean | AddEventListenerOptions,\n  ): void {\n    super.removeEventListener(\n      type,\n      listener as EventListenerOrEventListenerObject,\n      options,\n    )\n  }\n\n  public dispatchEvent(event: Event): boolean {\n    return super.dispatchEvent(event)\n  }\n\n  public close(): void {\n    this[kAbortController].abort()\n    this.readyState = this.CLOSED\n  }\n\n  private async connect() {\n    await fetch(this[kRequest])\n      .then((response) => {\n        this.processResponse(response)\n      })\n      .catch(() => {\n        // Fail the connection on request errors instead of\n        // throwing a generic \"Failed to fetch\" error.\n        this.failConnection()\n      })\n  }\n\n  private processResponse(response: Response): void {\n    if (!response.body) {\n      this.failConnection()\n      return\n    }\n\n    if (isNetworkError(response)) {\n      this.reestablishConnection()\n      return\n    }\n\n    if (\n      response.status !== 200 ||\n      response.headers.get('content-type') !== 'text/event-stream'\n    ) {\n      this.failConnection()\n      return\n    }\n\n    this.announceConnection()\n    this.interpretResponseBody(response)\n  }\n\n  private announceConnection(): void {\n    queueMicrotask(() => {\n      if (this.readyState !== this.CLOSED) {\n        this.readyState = this.OPEN\n        this.dispatchEvent(new Event('open'))\n      }\n    })\n  }\n\n  private interpretResponseBody(response: Response): void {\n    const parsingStream = new EventSourceParsingStream({\n      message: (message) => {\n        if (message.id) {\n          this[kLastEventId] = message.id\n        }\n\n        if (message.retry) {\n          this[kReconnectionTime] = message.retry\n        }\n\n        const messageEvent = new MessageEvent(\n          message.event ? message.event : 'message',\n          {\n            data: message.data,\n            origin: this[kRequest].url,\n            lastEventId: this[kLastEventId],\n            cancelable: true,\n          },\n        )\n\n        this[kOnAnyMessage]?.(messageEvent)\n        this.dispatchEvent(messageEvent)\n      },\n      abort: () => {\n        throw new Error('Stream abort is not implemented')\n      },\n      close: () => {\n        this.failConnection()\n      },\n    })\n\n    response\n      .body!.pipeTo(parsingStream)\n      .then(() => {\n        this.processResponseEndOfBody(response)\n      })\n      .catch(() => {\n        this.failConnection()\n      })\n  }\n\n  private processResponseEndOfBody(response: Response): void {\n    if (!isNetworkError(response)) {\n      this.reestablishConnection()\n    }\n  }\n\n  private async reestablishConnection(): Promise<void> {\n    queueMicrotask(() => {\n      if (this.readyState === this.CLOSED) {\n        return\n      }\n\n      this.readyState = this.CONNECTING\n      this.dispatchEvent(new Event('error'))\n    })\n\n    await delay(this[kReconnectionTime])\n\n    queueMicrotask(async () => {\n      if (this.readyState !== this.CONNECTING) {\n        return\n      }\n\n      if (this[kLastEventId] !== '') {\n        this[kRequest].headers.set('last-event-id', this[kLastEventId])\n      }\n\n      await this.connect()\n    })\n  }\n\n  private failConnection(): void {\n    queueMicrotask(() => {\n      if (this.readyState !== this.CLOSED) {\n        this.readyState = this.CLOSED\n        this.dispatchEvent(new Event('error'))\n      }\n    })\n  }\n}\n\n/**\n * Checks if the given `Response` instance is a network error.\n * @see https://fetch.spec.whatwg.org/#concept-network-error\n */\nfunction isNetworkError(response: Response): boolean {\n  return (\n    response.type === 'error' &&\n    response.status === 0 &&\n    response.statusText === '' &&\n    Array.from(response.headers.entries()).length === 0 &&\n    response.body === null\n  )\n}\n\nconst enum ControlCharacters {\n  NewLine = 10,\n  CarriageReturn = 13,\n  Space = 32,\n  Colon = 58,\n}\n\ninterface EventSourceMessage {\n  id?: string\n  event?: string\n  data?: string\n  retry?: number\n}\n\nclass EventSourceParsingStream extends WritableStream {\n  private decoder: TextDecoder\n\n  private buffer?: Uint8Array\n  private position: number\n  private fieldLength?: number\n  private discardTrailingNewline = false\n\n  private message: EventSourceMessage = {\n    id: undefined,\n    event: undefined,\n    data: undefined,\n    retry: undefined,\n  }\n\n  constructor(\n    private underlyingSink: {\n      message: (message: EventSourceMessage) => void\n      abort?: (reason: any) => void\n      close?: () => void\n    },\n  ) {\n    super({\n      write: (chunk) => {\n        this.processResponseBodyChunk(chunk)\n      },\n      abort: (reason) => {\n        this.underlyingSink.abort?.(reason)\n      },\n      close: () => {\n        this.underlyingSink.close?.()\n      },\n    })\n\n    this.decoder = new TextDecoder()\n    this.position = 0\n  }\n\n  private resetMessage(): void {\n    this.message = {\n      id: undefined,\n      event: undefined,\n      data: undefined,\n      retry: undefined,\n    }\n  }\n\n  private processResponseBodyChunk(chunk: Uint8Array): void {\n    if (this.buffer == null) {\n      this.buffer = chunk\n      this.position = 0\n      this.fieldLength = -1\n    } else {\n      const nextBuffer = new Uint8Array(this.buffer.length + chunk.length)\n      nextBuffer.set(this.buffer)\n      nextBuffer.set(chunk, this.buffer.length)\n      this.buffer = nextBuffer\n    }\n\n    const bufferLength = this.buffer.length\n    let lineStart = 0\n\n    while (this.position < bufferLength) {\n      if (this.discardTrailingNewline) {\n        if (this.buffer[this.position] === ControlCharacters.NewLine) {\n          lineStart = ++this.position\n        }\n\n        this.discardTrailingNewline = false\n      }\n\n      let lineEnd = -1\n\n      for (; this.position < bufferLength && lineEnd === -1; ++this.position) {\n        switch (this.buffer[this.position]) {\n          case ControlCharacters.Colon: {\n            if (this.fieldLength === -1) {\n              this.fieldLength = this.position - lineStart\n            }\n            break\n          }\n\n          case ControlCharacters.CarriageReturn: {\n            this.discardTrailingNewline = true\n            break\n          }\n\n          case ControlCharacters.NewLine: {\n            lineEnd = this.position\n            break\n          }\n        }\n      }\n\n      if (lineEnd === -1) {\n        break\n      }\n\n      this.processLine(\n        this.buffer.subarray(lineStart, lineEnd),\n        this.fieldLength!,\n      )\n\n      lineStart = this.position\n      this.fieldLength = -1\n    }\n\n    if (lineStart === bufferLength) {\n      this.buffer = undefined\n    } else if (lineStart !== 0) {\n      this.buffer = this.buffer.subarray(lineStart)\n      this.position -= lineStart\n    }\n  }\n\n  private processLine(line: Uint8Array, fieldLength: number): void {\n    // New line indicates the end of the message. Dispatch it.\n    if (line.length === 0) {\n      // Prevent dispatching the message if the data is an empty string.\n      // That is a no-op per spec.\n      if (this.message.data === undefined) {\n        this.message.event = undefined\n        return\n      }\n\n      this.underlyingSink.message(this.message)\n      this.resetMessage()\n      return\n    }\n\n    // Otherwise, keep accumulating message fields until the new line.\n    if (fieldLength > 0) {\n      const field = this.decoder.decode(line.subarray(0, fieldLength))\n      const valueOffset =\n        fieldLength +\n        (line[fieldLength + 1] === ControlCharacters.Space ? 2 : 1)\n      const value = this.decoder.decode(line.subarray(valueOffset))\n\n      switch (field) {\n        case 'data': {\n          this.message.data = this.message.data\n            ? this.message.data + '\\n' + value\n            : value\n          break\n        }\n\n        case 'event': {\n          this.message.event = value\n          break\n        }\n\n        case 'id': {\n          this.message.id = value\n          break\n        }\n\n        case 'retry': {\n          const retry = parseInt(value, 10)\n\n          if (!isNaN(retry)) {\n            this.message.retry = retry\n          }\n          break\n        }\n      }\n    }\n  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