puppeteer-core
Version:
A high-level API to control headless Chrome over the DevTools Protocol
72 lines • 2.45 kB
JavaScript
import { EventEmitter } from '../common/EventEmitter.js';
import { debugError } from '../common/util.js';
import { assert } from '../util/assert.js';
import { DisposableStack } from '../util/disposable.js';
/**
* @internal
*/
export class PipeTransport {
#pipeWrite;
#subscriptions = new DisposableStack();
#isClosed = false;
#pendingMessage = [];
onclose;
onmessage;
constructor(pipeWrite, pipeRead) {
this.#pipeWrite = pipeWrite;
const pipeReadEmitter = this.#subscriptions.use(
// NodeJS event emitters don't support `*` so we need to typecast
// As long as we don't use it we should be OK.
new EventEmitter(pipeRead));
pipeReadEmitter.on('data', buffer => {
return this.#dispatch(buffer);
});
pipeReadEmitter.on('close', () => {
if (this.onclose) {
this.onclose.call(null);
}
});
pipeReadEmitter.on('error', debugError);
const pipeWriteEmitter = this.#subscriptions.use(
// NodeJS event emitters don't support `*` so we need to typecast
// As long as we don't use it we should be OK.
new EventEmitter(pipeWrite));
pipeWriteEmitter.on('error', debugError);
}
send(message) {
assert(!this.#isClosed, '`PipeTransport` is closed.');
this.#pipeWrite.write(message);
this.#pipeWrite.write('\0');
}
#dispatch(buffer) {
assert(!this.#isClosed, '`PipeTransport` is closed.');
this.#pendingMessage.push(buffer);
if (buffer.indexOf('\0') === -1) {
return;
}
const concatBuffer = Buffer.concat(this.#pendingMessage);
let start = 0;
let end = concatBuffer.indexOf('\0');
while (end !== -1) {
const message = concatBuffer.toString(undefined, start, end);
setImmediate(() => {
if (this.onmessage) {
this.onmessage.call(null, message);
}
});
start = end + 1;
end = concatBuffer.indexOf('\0', start);
}
if (start >= concatBuffer.length) {
this.#pendingMessage = [];
}
else {
this.#pendingMessage = [concatBuffer.subarray(start)];
}
}
close() {
this.#isClosed = true;
this.#subscriptions.dispose();
}
}
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