puppeteer-core
Version:
A high-level API to control headless Chrome over the DevTools Protocol
68 lines • 2.37 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(pipeRead));
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.');
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() {
this.#isClosed = true;
this.#subscriptions.dispose();
}
}
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