#!/usr/bin/env node
/**
* BridgeContext Native Host v1.0.0
* This script acts as a bridge between the Browser Extension and the VS Code Extension.
* It uses the Google Chrome Native Messaging API.
*/
const fs = require('fs');
const path = require('path');
// We use a local file as a temporary "Exchange" if the IDE isn't listening via IPC
const EXCHANGE_FILE = path.join(__dirname, 'exchange.json');
/**
* Native Messaging protocol uses a 4-byte header for message length.
*/
function readMessage() {
const header = Buffer.alloc(4);
const bytesRead = fs.readSync(0, header, 0, 4);
if (bytesRead === 0) return null;
const length = header.readUInt32LE(0);
const content = Buffer.alloc(length);
fs.readSync(0, content, 0, length);
return JSON.parse(content.toString());
}
function sendMessage(msg) {
const content = Buffer.from(JSON.stringify(msg));
const header = Buffer.alloc(4);
header.writeUInt32LE(content.length, 0);
process.stdout.write(header);
process.stdout.write(content);
}
// Main logic
try {
const message = readMessage();
if (message) {
if (message.action === 'sync') {
// Save to exchange file atomically for VS Code to pick up
const tempFile = EXCHANGE_FILE + '.tmp';
try {
fs.writeFileSync(tempFile, JSON.stringify(message.pack, null, 2));
// On Windows, renameSync can fail with EPERM if the file is locked
// briefly by a watcher (like the VS Code extension). Retry a few times.
let attempts = 0;
const maxAttempts = 5;
while (attempts < maxAttempts) {
try {
if (fs.existsSync(EXCHANGE_FILE)) {
// Some environments require explicitly deleting the target before rename for EPERM
// though renameSync should handle it.
}
fs.renameSync(tempFile, EXCHANGE_FILE);
break;
} catch (e) {
attempts++;
if (attempts >= maxAttempts) throw e;
// Sleep briefly (synchronous busy wait for simplicity in this Node script)
const start = Date.now();
while (Date.now() - start < 50) { }
}
}
sendMessage({ status: 'success', message: 'Context synced to local exchange.' });
} catch (err) {
// Return errors gracefully to the extension
sendMessage({ status: 'error', message: 'Failed to write exchange file: ' + err.message });
}
} else if (message.action === 'ping') {
sendMessage({ status: 'pong', version: '1.0.0' });
}
}
} catch (err) {
console.error(err);
process.exit(1);
}
