PipeTransport.js•2.66 kB
/*
* Copyright 2025 Google LLC.
* Copyright (c) Microsoft Corporation.
*
* 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 debug from 'debug';
const debugInternal = debug('bidi:server:pipeTranspot');
export class PipeTransport {
#pipeWrite;
#onMessage = null;
#pendingMessage = '';
constructor(pipeWrite, pipeRead) {
this.#pipeWrite = pipeWrite;
pipeRead.on('data', (chunk) => {
return this.#dispatch(chunk);
});
pipeRead.on('close', () => {
this.close();
});
pipeRead.on('error', (error) => {
debugInternal('Pipe read error: ', error);
this.close();
});
pipeWrite.on('error', (error) => {
debugInternal('Pipe read error: ', error);
this.close();
});
}
setOnMessage(onMessage) {
this.#onMessage = onMessage;
}
sendMessage(message) {
// TODO: WebSocketServer keeps sending messages after closing the transport.
// TODO: we should assert that the pipe was not closed.
this.#pipeWrite.write(message);
this.#pipeWrite.write('\0');
}
#dispatch(buffer) {
// TODO: WebSocketServer keeps sending messages after closing the transport.
// TODO: we should assert that the pipe was not 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() {
debugInternal('Closing pipe');
}
}
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