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