96 lines
2.7 KiB
TypeScript
96 lines
2.7 KiB
TypeScript
/**
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* Copyright 2018 Google Inc. All rights reserved.
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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 {type ConnectionTransport} from '../common/ConnectionTransport.js';
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import {EventSubscription} from '../common/EventEmitter.js';
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import {debugError} from '../common/util.js';
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import {assert} from '../util/assert.js';
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/**
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* @internal
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*/
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export class PipeTransport implements ConnectionTransport {
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#pipeWrite: NodeJS.WritableStream;
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#subscriptions = new DisposableStack();
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#isClosed = false;
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#pendingMessage = '';
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onclose?: () => void;
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onmessage?: (value: string) => void;
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constructor(
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pipeWrite: NodeJS.WritableStream,
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pipeRead: NodeJS.ReadableStream
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) {
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this.#pipeWrite = pipeWrite;
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this.#subscriptions.use(
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new EventSubscription(pipeRead, 'data', (buffer: Buffer) => {
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return this.#dispatch(buffer);
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})
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);
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this.#subscriptions.use(
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new EventSubscription(pipeRead, 'close', () => {
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if (this.onclose) {
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this.onclose.call(null);
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}
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})
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);
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this.#subscriptions.use(
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new EventSubscription(pipeRead, 'error', debugError)
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);
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this.#subscriptions.use(
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new EventSubscription(pipeWrite, 'error', debugError)
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);
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}
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send(message: string): void {
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assert(!this.#isClosed, '`PipeTransport` is closed.');
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this.#pipeWrite.write(message);
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this.#pipeWrite.write('\0');
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}
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#dispatch(buffer: Buffer): void {
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assert(!this.#isClosed, '`PipeTransport` is closed.');
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let end = buffer.indexOf('\0');
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if (end === -1) {
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this.#pendingMessage += buffer.toString();
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return;
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}
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const message = this.#pendingMessage + buffer.toString(undefined, 0, end);
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if (this.onmessage) {
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this.onmessage.call(null, message);
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}
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let start = end + 1;
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end = buffer.indexOf('\0', start);
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while (end !== -1) {
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if (this.onmessage) {
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this.onmessage.call(null, buffer.toString(undefined, start, end));
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}
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start = end + 1;
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end = buffer.indexOf('\0', start);
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}
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this.#pendingMessage = buffer.toString(undefined, start);
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}
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close(): void {
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this.#isClosed = true;
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this.#subscriptions.dispose();
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}
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}
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