7385b31f13
When the client only closes the input pipe, we are still sending protocol messages over the output pipe. This could probably lead to some errors, e.g. write buffer being full.
105 lines
2.9 KiB
TypeScript
105 lines
2.9 KiB
TypeScript
/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { makeWaitForNextTask } from '../utils/utils';
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export interface WritableStream {
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write(data: Buffer): void;
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}
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export interface ReadableStream {
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on(event: 'data', callback: (b: Buffer) => void): void;
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on(event: 'close', callback: () => void): void;
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}
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export interface ClosableStream {
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close(): void;
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}
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export class Transport {
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private _pipeWrite: WritableStream;
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private _data = Buffer.from([]);
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private _waitForNextTask = makeWaitForNextTask();
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private _closed = false;
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private _bytesLeft = 0;
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onmessage?: (message: string) => void;
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onclose?: () => void;
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private _endian: 'be' | 'le';
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private _closeableStream: ClosableStream | undefined;
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constructor(pipeWrite: WritableStream, pipeRead: ReadableStream, closeable?: ClosableStream, endian: 'be' | 'le' = 'le') {
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this._pipeWrite = pipeWrite;
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this._endian = endian;
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this._closeableStream = closeable;
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pipeRead.on('data', buffer => this._dispatch(buffer));
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pipeRead.on('close', () => {
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this._closed = true;
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if (this.onclose)
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this.onclose();
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});
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this.onmessage = undefined;
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this.onclose = undefined;
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}
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send(message: string) {
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if (this._closed)
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throw new Error('Pipe has been closed');
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const data = Buffer.from(message, 'utf-8');
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const dataLength = Buffer.alloc(4);
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if (this._endian === 'be')
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dataLength.writeUInt32BE(data.length, 0);
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else
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dataLength.writeUInt32LE(data.length, 0);
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this._pipeWrite.write(dataLength);
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this._pipeWrite.write(data);
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}
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close() {
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// Let it throw.
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this._closeableStream!.close();
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}
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_dispatch(buffer: Buffer) {
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this._data = Buffer.concat([this._data, buffer]);
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while (true) {
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if (!this._bytesLeft && this._data.length < 4) {
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// Need more data.
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break;
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}
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if (!this._bytesLeft) {
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this._bytesLeft = this._endian === 'be' ? this._data.readUInt32BE(0) : this._data.readUInt32LE(0);
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this._data = this._data.slice(4);
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}
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if (!this._bytesLeft || this._data.length < this._bytesLeft) {
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// Need more data.
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break;
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}
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const message = this._data.slice(0, this._bytesLeft);
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this._data = this._data.slice(this._bytesLeft);
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this._bytesLeft = 0;
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this._waitForNextTask(() => {
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if (this.onmessage)
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this.onmessage(message.toString('utf-8'));
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});
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}
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}
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}
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