{"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 { ResponseResolutionContext } from '~/core/utils/executeHandlers'\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 & {\n client: ServerSentEventClient\n server: ServerSentEventServer\n}\n\nexport type ServerSentEventResolver<\n EventMap extends EventMapConstraint,\n Params extends PathParams,\n> = ResponseResolver, any, any>\n\nexport type ServerSentEventRequestHandler = <\n EventMap extends EventMapConstraint = { message: unknown },\n Params extends PathParams = PathParams,\n RequestPath extends Path = Path,\n>(\n path: RequestPath,\n resolver: ServerSentEventResolver,\n) => HttpHandler\n\nexport type ServerSentEventMessage<\n EventMap extends EventMapConstraint = { message: unknown },\n> =\n | ToEventDiscriminatedUnion\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\nconst SSE_RESPONSE_INIT: ResponseInit = {\n headers: {\n 'content-type': 'text/event-stream',\n 'cache-control': 'no-cache',\n connection: 'keep-alive',\n },\n}\n\nclass ServerSentEventHandler<\n EventMap extends EventMapConstraint,\n> extends HttpHandler {\n #emitter: Emitter\n\n constructor(path: Path, resolver: ServerSentEventResolver) {\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 super('GET', path, async (info) => {\n const stream = new ReadableStream({\n start: async (controller) => {\n const client = new ServerSentEventClient({\n controller,\n emitter: this.#emitter,\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, SSE_RESPONSE_INIT)\n })\n\n this.#emitter = new Emitter()\n }\n\n async predicate(args: {\n request: Request\n parsedResult: HttpRequestParsedResult\n resolutionContext?: ResponseResolutionContext\n }) {\n if (args.request.headers.get('accept') !== 'text/event-stream') {\n return false\n }\n\n const matches = await super.predicate(args)\n\n if (matches && !args.resolutionContext?.quiet) {\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: args.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]', SSE_RESPONSE_INIT),\n })\n\n this.#attachClientLogger(args.request, this.#emitter)\n }\n\n return matches\n }\n\n async log(_args: { request: Request; response: Response }): Promise {\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,\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[keyof T]\ntype Identity = { [K in keyof T]: T[K] } & unknown\ntype ToEventDiscriminatedUnion = 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\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\n\n constructor(args: {\n controller: ReadableStreamDefaultController\n emitter: Emitter\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): 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 = []\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 if (message.data != null) {\n /**\n * Split data on line terminators (LF, CR, or CRLF) and translate them to individual frames.\n * @see https://html.spec.whatwg.org/multipage/server-sent-events.html#event-stream-interpretation\n * @see https://html.spec.whatwg.org/multipage/server-sent-events.html#parsing-an-event-stream\n */\n for (const line of message.data.toString().split(/\\r\\n|\\r|\\n/)) {\n frames.push(`data:${line}`)\n }\n }\n\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\n\n constructor(args: { request: Request; client: ServerSentEventClient }) {\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 = (\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 | null = null\n private [kOnMessage]: EventHandler | null = null\n private [kOnAnyMessage]: EventHandler | null = null\n private [kOnError]: EventHandler | 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 | null {\n return this[kOnOpen]\n }\n\n set onopen(handler: EventHandler) {\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 | null {\n return this[kOnMessage]\n }\n set onmessage(handler: EventHandler) {\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 | null {\n return this[kOnError]\n }\n set oneerror(handler: EventHandler) {\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(\n type: K,\n listener: EventHandler,\n options?: boolean | AddEventListenerOptions,\n ): void\n public addEventListener(\n type: string,\n listener: EventHandler,\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 | EventListenerOrEventListenerObject,\n options?: boolean | AddEventListenerOptions,\n ): void {\n super.addEventListener(\n type,\n listener as EventListenerOrEventListenerObject,\n options,\n )\n }\n\n public removeEventListener(\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 | 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 {\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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