nodeFetchHttpClient.js.map

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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport * as http from \"http\";\nimport * as https from \"https\";\nimport { AbortController, AbortError } from \"@azure/abort-controller\";\nimport { HttpHeaders, HttpHeadersLike } from \"./httpHeaders\";\nimport { ProxyAgent, createProxyAgent, isUrlHttps } from \"./proxyAgent\";\nimport { Readable, Transform } from \"stream\";\nimport { TransferProgressEvent, WebResourceLike } from \"./webResource\";\nimport FormData from \"form-data\";\nimport { HttpClient } from \"./httpClient\";\nimport { HttpOperationResponse } from \"./httpOperationResponse\";\nimport { RestError } from \"./restError\";\nimport { logger } from \"./log\";\nimport node_fetch from \"node-fetch\";\n\ninterface AgentCache {\n  httpAgent?: http.Agent;\n  httpsAgent?: https.Agent;\n}\n\nfunction getCachedAgent(\n  isHttps: boolean,\n  agentCache: AgentCache\n): http.Agent | https.Agent | undefined {\n  return isHttps ? agentCache.httpsAgent : agentCache.httpAgent;\n}\n\ninterface FetchError extends Error {\n  code?: string;\n  errno?: string;\n  type?: string;\n}\n\n/**\n * String URLs used when calling to `fetch()`.\n */\nexport type CommonRequestInfo = string;\n\n/**\n * An object containing information about the outgoing HTTP request.\n */\nexport type CommonRequestInit = Omit<RequestInit, \"body\" | \"headers\" | \"signal\"> & {\n  body?: any;\n  headers?: any;\n  signal?: any;\n};\n\n/**\n * An object containing information about the incoming HTTP response.\n */\nexport type CommonResponse = Omit<Response, \"body\" | \"trailer\" | \"formData\"> & {\n  body: any;\n  trailer: any;\n  formData: any;\n};\n\nexport class ReportTransform extends Transform {\n  private loadedBytes: number = 0;\n  _transform(chunk: string | Buffer, _encoding: string, callback: (arg: any) => void): void {\n    this.push(chunk);\n    this.loadedBytes += chunk.length;\n    this.progressCallback!({ loadedBytes: this.loadedBytes });\n    callback(undefined);\n  }\n\n  constructor(private progressCallback: (progress: TransferProgressEvent) => void) {\n    super();\n  }\n}\n\nfunction isReadableStream(body: any): body is Readable {\n  return body && typeof body.pipe === \"function\";\n}\n\nfunction isStreamComplete(stream: Readable, aborter?: AbortController): Promise<void> {\n  return new Promise((resolve) => {\n    stream.once(\"close\", () => {\n      aborter?.abort();\n      resolve();\n    });\n    stream.once(\"end\", resolve);\n    stream.once(\"error\", resolve);\n  });\n}\n\n/**\n * Transforms a set of headers into the key/value pair defined by {@link HttpHeadersLike}\n */\nexport function parseHeaders(headers: Headers): HttpHeadersLike {\n  const httpHeaders = new HttpHeaders();\n\n  headers.forEach((value, key) => {\n    httpHeaders.set(key, value);\n  });\n\n  return httpHeaders;\n}\n\n/**\n * An HTTP client that uses `node-fetch`.\n */\nexport class NodeFetchHttpClient implements HttpClient {\n  /**\n   * Provides minimum viable error handling and the logic that executes the abstract methods.\n   * @param httpRequest - Object representing the outgoing HTTP request.\n   * @returns An object representing the incoming HTTP response.\n   */\n  async sendRequest(httpRequest: WebResourceLike): Promise<HttpOperationResponse> {\n    if (!httpRequest && typeof httpRequest !== \"object\") {\n      throw new Error(\n        \"'httpRequest' (WebResourceLike) cannot be null or undefined and must be of type object.\"\n      );\n    }\n\n    const abortController = new AbortController();\n    let abortListener: ((event: any) => void) | undefined;\n    if (httpRequest.abortSignal) {\n      if (httpRequest.abortSignal.aborted) {\n        throw new AbortError(\"The operation was aborted.\");\n      }\n\n      abortListener = (event: Event) => {\n        if (event.type === \"abort\") {\n          abortController.abort();\n        }\n      };\n      httpRequest.abortSignal.addEventListener(\"abort\", abortListener);\n    }\n\n    if (httpRequest.timeout) {\n      setTimeout(() => {\n        abortController.abort();\n      }, httpRequest.timeout);\n    }\n\n    if (httpRequest.formData) {\n      const formData: any = httpRequest.formData;\n      const requestForm = new FormData();\n      const appendFormValue = (key: string, value: any): void => {\n        // value function probably returns a stream so we can provide a fresh stream on each retry\n        if (typeof value === \"function\") {\n          value = value();\n        }\n        if (\n          value &&\n          Object.prototype.hasOwnProperty.call(value, \"value\") &&\n          Object.prototype.hasOwnProperty.call(value, \"options\")\n        ) {\n          requestForm.append(key, value.value, value.options);\n        } else {\n          requestForm.append(key, value);\n        }\n      };\n      for (const formKey of Object.keys(formData)) {\n        const formValue = formData[formKey];\n        if (Array.isArray(formValue)) {\n          for (let j = 0; j < formValue.length; j++) {\n            appendFormValue(formKey, formValue[j]);\n          }\n        } else {\n          appendFormValue(formKey, formValue);\n        }\n      }\n\n      httpRequest.body = requestForm;\n      httpRequest.formData = undefined;\n      const contentType = httpRequest.headers.get(\"Content-Type\");\n      if (contentType && contentType.indexOf(\"multipart/form-data\") !== -1) {\n        if (typeof requestForm.getBoundary === \"function\") {\n          httpRequest.headers.set(\n            \"Content-Type\",\n            `multipart/form-data; boundary=${requestForm.getBoundary()}`\n          );\n        } else {\n          // browser will automatically apply a suitable content-type header\n          httpRequest.headers.remove(\"Content-Type\");\n        }\n      }\n    }\n\n    let body = httpRequest.body\n      ? typeof httpRequest.body === \"function\"\n        ? httpRequest.body()\n        : httpRequest.body\n      : undefined;\n    if (httpRequest.onUploadProgress && httpRequest.body) {\n      const onUploadProgress = httpRequest.onUploadProgress;\n      const uploadReportStream = new ReportTransform(onUploadProgress);\n      if (isReadableStream(body)) {\n        body.pipe(uploadReportStream);\n      } else {\n        uploadReportStream.end(body);\n      }\n\n      body = uploadReportStream;\n    }\n\n    const platformSpecificRequestInit: Partial<RequestInit> = await this.prepareRequest(\n      httpRequest\n    );\n\n    const requestInit: RequestInit = {\n      body: body,\n      headers: httpRequest.headers.rawHeaders(),\n      method: httpRequest.method,\n      // the types for RequestInit are from the browser, which expects AbortSignal to\n      // have `reason` and `throwIfAborted`, but these don't exist on our polyfill\n      // for Node.\n      signal: abortController.signal as any,\n      redirect: \"manual\",\n      ...platformSpecificRequestInit,\n    };\n\n    let operationResponse: HttpOperationResponse | undefined;\n    try {\n      const response: CommonResponse = await this.fetch(httpRequest.url, requestInit);\n\n      const headers = parseHeaders(response.headers);\n\n      const streaming =\n        httpRequest.streamResponseStatusCodes?.has(response.status) ||\n        httpRequest.streamResponseBody;\n\n      operationResponse = {\n        headers: headers,\n        request: httpRequest,\n        status: response.status,\n        readableStreamBody: streaming\n          ? (response.body as unknown as NodeJS.ReadableStream)\n          : undefined,\n        bodyAsText: !streaming ? await response.text() : undefined,\n      };\n\n      const onDownloadProgress = httpRequest.onDownloadProgress;\n      if (onDownloadProgress) {\n        const responseBody: ReadableStream<Uint8Array> | undefined = response.body || undefined;\n\n        if (isReadableStream(responseBody)) {\n          const downloadReportStream = new ReportTransform(onDownloadProgress);\n          responseBody.pipe(downloadReportStream);\n          operationResponse.readableStreamBody = downloadReportStream;\n        } else {\n          const length = parseInt(headers.get(\"Content-Length\")!) || undefined;\n          if (length) {\n            // Calling callback for non-stream response for consistency with browser\n            onDownloadProgress({ loadedBytes: length });\n          }\n        }\n      }\n\n      await this.processRequest(operationResponse);\n\n      return operationResponse;\n    } catch (error: any) {\n      const fetchError: FetchError = error;\n      if (fetchError.code === \"ENOTFOUND\") {\n        throw new RestError(\n          fetchError.message,\n          RestError.REQUEST_SEND_ERROR,\n          undefined,\n          httpRequest\n        );\n      } else if (fetchError.type === \"aborted\") {\n        throw new AbortError(\"The operation was aborted.\");\n      }\n\n      throw fetchError;\n    } finally {\n      // clean up event listener\n      if (httpRequest.abortSignal && abortListener) {\n        let uploadStreamDone = Promise.resolve();\n        if (isReadableStream(body)) {\n          uploadStreamDone = isStreamComplete(body);\n        }\n        let downloadStreamDone = Promise.resolve();\n        if (isReadableStream(operationResponse?.readableStreamBody)) {\n          downloadStreamDone = isStreamComplete(\n            operationResponse!.readableStreamBody,\n            abortController\n          );\n        }\n\n        Promise.all([uploadStreamDone, downloadStreamDone])\n          .then(() => {\n            httpRequest.abortSignal?.removeEventListener(\"abort\", abortListener!);\n            return;\n          })\n          .catch((e) => {\n            logger.warning(\"Error when cleaning up abortListener on httpRequest\", e);\n          });\n      }\n    }\n  }\n\n  // a mapping of proxy settings string `${host}:${port}:${username}:${password}` to agent\n  private proxyAgentMap: Map<string, AgentCache> = new Map();\n  private keepAliveAgents: AgentCache = {};\n\n  private getOrCreateAgent(httpRequest: WebResourceLike): http.Agent | https.Agent {\n    const isHttps = isUrlHttps(httpRequest.url);\n\n    // At the moment, proxy settings and keepAlive are mutually\n    // exclusive because the 'tunnel' library currently lacks the\n    // ability to create a proxy with keepAlive turned on.\n    if (httpRequest.proxySettings) {\n      const { host, port, username, password } = httpRequest.proxySettings;\n      const key = `${host}:${port}:${username}:${password}`;\n      const proxyAgents = this.proxyAgentMap.get(key) ?? {};\n\n      let agent = getCachedAgent(isHttps, proxyAgents);\n      if (agent) {\n        return agent;\n      }\n\n      const tunnel: ProxyAgent = createProxyAgent(\n        httpRequest.url,\n        httpRequest.proxySettings,\n        httpRequest.headers\n      );\n\n      agent = tunnel.agent;\n      if (tunnel.isHttps) {\n        proxyAgents.httpsAgent = tunnel.agent as https.Agent;\n      } else {\n        proxyAgents.httpAgent = tunnel.agent;\n      }\n      this.proxyAgentMap.set(key, proxyAgents);\n\n      return agent;\n    } else if (httpRequest.keepAlive) {\n      let agent = getCachedAgent(isHttps, this.keepAliveAgents);\n      if (agent) {\n        return agent;\n      }\n\n      const agentOptions: http.AgentOptions | https.AgentOptions = {\n        keepAlive: httpRequest.keepAlive,\n      };\n\n      if (isHttps) {\n        agent = this.keepAliveAgents.httpsAgent = new https.Agent(agentOptions);\n      } else {\n        agent = this.keepAliveAgents.httpAgent = new http.Agent(agentOptions);\n      }\n\n      return agent;\n    } else {\n      return isHttps ? https.globalAgent : http.globalAgent;\n    }\n  }\n\n  /**\n   * Uses `node-fetch` to perform the request.\n   */\n  // eslint-disable-next-line @azure/azure-sdk/ts-apisurface-standardized-verbs\n  async fetch(input: CommonRequestInfo, init?: CommonRequestInit): Promise<CommonResponse> {\n    return node_fetch(input, init) as unknown as Promise<CommonResponse>;\n  }\n\n  /**\n   * Prepares a request based on the provided web resource.\n   */\n  async prepareRequest(httpRequest: WebResourceLike): Promise<Partial<RequestInit>> {\n    const requestInit: Partial<RequestInit & { agent?: any; compress?: boolean }> = {};\n\n    // Set the http(s) agent\n    requestInit.agent = this.getOrCreateAgent(httpRequest);\n\n    requestInit.compress = httpRequest.decompressResponse;\n\n    return requestInit;\n  }\n\n  /**\n   * Process an HTTP response.\n   */\n  async processRequest(_operationResponse: HttpOperationResponse): Promise<void> {\n    /* no_op */\n  }\n}\n"]}