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Viewing file:     streamDispatcher.js (1.92 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.StreamDispatcher = void 0;
var _dispatcher = require("./dispatcher");
var _utils = require("../../utils");
/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the 'License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class StreamDispatcher extends _dispatcher.Dispatcher {
  constructor(scope, stream) {
    super(scope, {
      guid: 'stream@' + (0, _utils.createGuid)(),
      stream
    }, 'Stream', {});
    // In Node v12.9.0+ we can use readableEnded.
    this._type_Stream = true;
    this._ended = false;
    stream.once('end', () => this._ended = true);
    stream.once('error', () => this._ended = true);
  }
  async read(params) {
    const stream = this._object.stream;
    if (this._ended) return {
      binary: Buffer.from('')
    };
    if (!stream.readableLength) {
      const readyPromise = new _utils.ManualPromise();
      const done = () => readyPromise.resolve();
      stream.on('readable', done);
      stream.on('end', done);
      stream.on('error', done);
      await readyPromise;
      stream.off('readable', done);
      stream.off('end', done);
      stream.off('error', done);
    }
    const buffer = stream.read(Math.min(stream.readableLength, params.size || stream.readableLength));
    return {
      binary: buffer || Buffer.from('')
    };
  }
  async close() {
    this._object.stream.destroy();
  }
}
exports.StreamDispatcher = StreamDispatcher;