AvroReadableFromStream.js.map

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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\nimport { AvroReadable, AvroReadableReadOptions } from \"./AvroReadable\";\nimport { AbortError } from \"@azure/abort-controller\";\n\nconst ABORT_ERROR = new AbortError(\"Reading from the avro stream was aborted.\");\n\nexport class AvroReadableFromStream extends AvroReadable {\n  private _position: number;\n  private _readable: NodeJS.ReadableStream;\n\n  private toUint8Array(data: string | Buffer): Uint8Array {\n    if (typeof data === \"string\") {\n      return Buffer.from(data);\n    }\n    return data;\n  }\n\n  constructor(readable: NodeJS.ReadableStream) {\n    super();\n    this._readable = readable;\n    this._position = 0;\n  }\n  public get position(): number {\n    return this._position;\n  }\n  public async read(size: number, options: AvroReadableReadOptions = {}): Promise<Uint8Array> {\n    if (options.abortSignal?.aborted) {\n      throw ABORT_ERROR;\n    }\n\n    if (size < 0) {\n      throw new Error(`size parameter should be positive: ${size}`);\n    }\n\n    if (size === 0) {\n      return new Uint8Array();\n    }\n\n    if (!this._readable.readable) {\n      throw new Error(\"Stream no longer readable.\");\n    }\n    // See if there is already enough data.\n    const chunk = this._readable.read(size);\n    if (chunk) {\n      this._position += chunk.length;\n      // chunk.length maybe less than desired size if the stream ends.\n      return this.toUint8Array(chunk);\n    } else {\n      // register callback to wait for enough data to read\n      return new Promise((resolve, reject) => {\n        /* eslint-disable @typescript-eslint/no-use-before-define */\n        const cleanUp: () => void = () => {\n          this._readable.removeListener(\"readable\", readableCallback);\n          this._readable.removeListener(\"error\", rejectCallback);\n          this._readable.removeListener(\"end\", rejectCallback);\n          this._readable.removeListener(\"close\", rejectCallback);\n\n          if (options.abortSignal) {\n            options.abortSignal!.removeEventListener(\"abort\", abortHandler);\n          }\n        };\n\n        const readableCallback: () => void = () => {\n          const callbackChunk = this._readable.read(size);\n          if (callbackChunk) {\n            this._position += callbackChunk.length;\n            cleanUp();\n            // callbackChunk.length maybe less than desired size if the stream ends.\n            resolve(this.toUint8Array(callbackChunk));\n          }\n        };\n\n        const rejectCallback: () => void = () => {\n          cleanUp();\n          reject();\n        };\n\n        const abortHandler: () => void = () => {\n          cleanUp();\n          reject(ABORT_ERROR);\n        };\n\n        this._readable.on(\"readable\", readableCallback);\n        this._readable.once(\"error\", rejectCallback);\n        this._readable.once(\"end\", rejectCallback);\n        this._readable.once(\"close\", rejectCallback);\n        if (options.abortSignal) {\n          options.abortSignal!.addEventListener(\"abort\", abortHandler);\n        }\n        /* eslint-enable @typescript-eslint/no-use-before-define */\n      });\n    }\n  }\n}\n"]}