@push.rocks/smartipc
Version:
A library for node inter process communication, providing an easy-to-use API for IPC.
599 lines • 46.4 kB
JavaScript
import * as plugins from './smartipc.plugins.js';
/**
* Abstract base class for IPC transports
*/
export class IpcTransport extends plugins.EventEmitter {
constructor(options) {
super();
this.connected = false;
this.messageBuffer = Buffer.alloc(0);
this.currentMessageLength = null;
this.options = options;
}
/**
* Check if transport is connected
*/
isConnected() {
return this.connected;
}
/**
* Parse incoming data with length-prefixed framing
*/
parseIncomingData(data) {
// Append new data to buffer
this.messageBuffer = Buffer.concat([this.messageBuffer, data]);
while (this.messageBuffer.length > 0) {
// If we don't have a message length yet, try to read it
if (this.currentMessageLength === null) {
if (this.messageBuffer.length >= 4) {
// Read the length prefix (4 bytes, big endian)
this.currentMessageLength = this.messageBuffer.readUInt32BE(0);
// Check max message size
const maxSize = this.options.maxMessageSize || 8 * 1024 * 1024; // 8MB default
if (this.currentMessageLength > maxSize) {
this.emit('error', new Error(`Message size ${this.currentMessageLength} exceeds maximum ${maxSize}`));
// Reset state to recover
this.messageBuffer = Buffer.alloc(0);
this.currentMessageLength = null;
return;
}
this.messageBuffer = this.messageBuffer.slice(4);
}
else {
// Not enough data for length prefix
break;
}
}
// If we have a message length, try to read the message
if (this.currentMessageLength !== null) {
if (this.messageBuffer.length >= this.currentMessageLength) {
// Extract the message
const messageData = this.messageBuffer.slice(0, this.currentMessageLength);
this.messageBuffer = this.messageBuffer.slice(this.currentMessageLength);
this.currentMessageLength = null;
// Parse and emit the message
try {
const message = JSON.parse(messageData.toString('utf8'));
this.emit('message', message);
}
catch (error) {
this.emit('error', new Error(`Failed to parse message: ${error.message}`));
}
}
else {
// Not enough data for the complete message
break;
}
}
}
}
/**
* Frame a message with length prefix
*/
frameMessage(message) {
const messageStr = JSON.stringify(message);
const messageBuffer = Buffer.from(messageStr, 'utf8');
const lengthBuffer = Buffer.allocUnsafe(4);
lengthBuffer.writeUInt32BE(messageBuffer.length, 0);
return Buffer.concat([lengthBuffer, messageBuffer]);
}
/**
* Handle socket errors
*/
handleError(error) {
this.emit('error', error);
this.connected = false;
this.emit('disconnect', error.message);
}
}
/**
* Unix domain socket transport for Linux/Mac
*/
export class UnixSocketTransport extends IpcTransport {
constructor() {
super(...arguments);
this.socket = null;
this.server = null;
this.clients = new Set();
this.socketToClientId = new WeakMap();
this.clientIdToSocket = new Map();
}
/**
* Connect as client or start as server
*/
async connect() {
return new Promise((resolve, reject) => {
const socketPath = this.getSocketPath();
// Try to connect as client first
this.socket = new plugins.net.Socket();
if (this.options.noDelay !== false) {
this.socket.setNoDelay(true);
}
this.socket.on('connect', () => {
this.connected = true;
this.setupSocketHandlers(this.socket);
this.emit('connect');
resolve();
});
this.socket.on('error', (error) => {
if (error.code === 'ECONNREFUSED' || error.code === 'ENOENT') {
// Determine if we must NOT auto-start server
const envVal = process.env.SMARTIPC_CLIENT_ONLY;
const envClientOnly = !!envVal && (envVal === '1' || envVal === 'true' || envVal === 'TRUE');
const clientOnly = this.options.clientOnly === true || envClientOnly;
if (clientOnly) {
// Reject instead of starting a server to avoid races
const reason = error.code || 'UNKNOWN';
const err = new Error(`Server not available (${reason}); clientOnly prevents auto-start`);
err.code = reason;
reject(err);
return;
}
// No server exists and clientOnly is false: become the server (back-compat)
this.socket = null;
this.startServer(socketPath).then(resolve).catch(reject);
}
else {
reject(error);
}
});
this.socket.connect(socketPath);
});
}
/**
* Start as server
*/
async startServer(socketPath) {
return new Promise((resolve, reject) => {
// Clean up stale socket file if autoCleanupSocketFile is enabled
if (this.options.autoCleanupSocketFile) {
try {
plugins.fs.unlinkSync(socketPath);
}
catch (error) {
// File doesn't exist, that's fine
}
}
this.server = plugins.net.createServer((socket) => {
// Each new connection gets added to clients
this.clients.add(socket);
if (this.options.noDelay !== false) {
socket.setNoDelay(true);
}
// Set up handlers for this client socket
socket.on('data', (data) => {
// Parse incoming data and emit with socket reference
this.parseIncomingDataFromClient(data, socket);
});
socket.on('error', (error) => {
this.emit('clientError', error, socket);
});
socket.on('close', () => {
this.clients.delete(socket);
// Clean up clientId mappings
const clientId = this.socketToClientId.get(socket);
if (clientId && this.clientIdToSocket.get(clientId) === socket) {
this.clientIdToSocket.delete(clientId);
}
this.socketToClientId.delete(socket);
// Emit with clientId if known so higher layers can react
this.emit('clientDisconnected', socket, clientId);
});
socket.on('drain', () => {
this.emit('drain');
});
// Emit new client connection
this.emit('clientConnected', socket);
});
this.server.on('error', reject);
this.server.listen(socketPath, () => {
// Set socket permissions if specified
if (this.options.socketMode !== undefined && process.platform !== 'win32') {
try {
plugins.fs.chmodSync(socketPath, this.options.socketMode);
}
catch (error) {
// Ignore permission errors, not critical
}
}
this.connected = true;
this.emit('connect');
resolve();
});
});
}
/**
* Parse incoming data from a specific client socket
*/
parseIncomingDataFromClient(data, socket) {
// We need to maintain separate buffers per client
// For now, just emit the raw message with the socket reference
const socketBuffers = this.clientBuffers || (this.clientBuffers = new WeakMap());
let buffer = socketBuffers.get(socket) || Buffer.alloc(0);
let currentLength = this.clientLengths?.get(socket) || null;
// Append new data to buffer
buffer = Buffer.concat([buffer, data]);
while (buffer.length > 0) {
// If we don't have a message length yet, try to read it
if (currentLength === null) {
if (buffer.length >= 4) {
// Read the length prefix (4 bytes, big endian)
currentLength = buffer.readUInt32BE(0);
buffer = buffer.slice(4);
}
else {
// Not enough data for length prefix
break;
}
}
// If we have a message length, try to read the message
if (currentLength !== null) {
if (buffer.length >= currentLength) {
// Extract the message
const messageData = buffer.slice(0, currentLength);
buffer = buffer.slice(currentLength);
currentLength = null;
// Parse and emit the message with socket reference
try {
const message = JSON.parse(messageData.toString('utf8'));
// Update clientId mapping
const clientId = message.headers?.clientId ??
(message.type === '__register__' ? message.payload?.clientId : undefined);
if (clientId) {
this.socketToClientId.set(socket, clientId);
this.clientIdToSocket.set(clientId, socket);
}
// Emit both events so IpcChannel can process it
this.emit('clientMessage', message, socket);
this.emit('message', message);
}
catch (error) {
this.emit('error', new Error(`Failed to parse message: ${error.message}`));
}
}
else {
// Not enough data for the complete message
break;
}
}
}
// Store the buffer and length for next time
socketBuffers.set(socket, buffer);
if (this.clientLengths) {
if (currentLength !== null) {
this.clientLengths.set(socket, currentLength);
}
else {
this.clientLengths.delete(socket);
}
}
else {
this.clientLengths = new WeakMap();
if (currentLength !== null) {
this.clientLengths.set(socket, currentLength);
}
}
}
/**
* Setup socket event handlers
*/
setupSocketHandlers(socket) {
socket.on('data', (data) => {
this.parseIncomingData(data);
});
socket.on('error', (error) => {
this.handleError(error);
});
socket.on('close', () => {
this.connected = false;
this.emit('disconnect');
});
socket.on('drain', () => {
this.emit('drain');
});
}
/**
* Disconnect the transport
*/
async disconnect() {
if (this.socket) {
this.socket.destroy();
this.socket = null;
}
if (this.server) {
for (const client of this.clients) {
client.destroy();
}
this.clients.clear();
await new Promise((resolve) => {
this.server.close(() => resolve());
});
this.server = null;
// Clean up socket file
try {
plugins.fs.unlinkSync(this.getSocketPath());
}
catch (error) {
// Ignore cleanup errors
}
}
this.connected = false;
this.emit('disconnect');
}
/**
* Send a message
*/
async send(message) {
const frame = this.frameMessage(message);
if (this.socket) {
// Client mode
return new Promise((resolve) => {
const success = this.socket.write(frame, (error) => {
if (error) {
this.handleError(error);
resolve(false);
}
else {
resolve(true);
}
});
// Handle backpressure
if (!success) {
this.socket.once('drain', () => resolve(true));
}
});
}
else if (this.server && this.clients.size > 0) {
// Server mode - route by clientId if present, otherwise broadcast
const targetClientId = message.headers?.clientId;
if (targetClientId && this.clientIdToSocket.has(targetClientId)) {
// Send to specific client
const targetSocket = this.clientIdToSocket.get(targetClientId);
if (targetSocket && !targetSocket.destroyed) {
return new Promise((resolve) => {
const success = targetSocket.write(frame, (error) => {
if (error) {
resolve(false);
}
else {
resolve(true);
}
});
if (!success) {
targetSocket.once('drain', () => resolve(true));
}
});
}
else {
// Socket is destroyed, remove from mappings
this.clientIdToSocket.delete(targetClientId);
return false;
}
}
else {
// Broadcast to all clients (fallback for messages without specific target)
const promises = [];
for (const client of this.clients) {
promises.push(new Promise((resolve) => {
const success = client.write(frame, (error) => {
if (error) {
resolve(false);
}
else {
resolve(true);
}
});
if (!success) {
client.once('drain', () => resolve(true));
}
}));
}
const results = await Promise.all(promises);
return results.every(r => r);
}
}
return false;
}
/**
* Get the socket path
*/
getSocketPath() {
if (this.options.socketPath) {
return this.options.socketPath;
}
const platform = plugins.os.platform();
const tmpDir = plugins.os.tmpdir();
const socketName = `smartipc-${this.options.id}.sock`;
if (platform === 'win32') {
// Windows named pipe path
return `\\\\.\\pipe\\${socketName}`;
}
else {
// Unix domain socket path
return plugins.path.join(tmpDir, socketName);
}
}
}
/**
* Named pipe transport for Windows
*/
export class NamedPipeTransport extends UnixSocketTransport {
}
/**
* TCP transport for network IPC
*/
export class TcpTransport extends IpcTransport {
constructor() {
super(...arguments);
this.socket = null;
this.server = null;
this.clients = new Set();
}
/**
* Connect as client or start as server
*/
async connect() {
return new Promise((resolve, reject) => {
const host = this.options.host || 'localhost';
const port = this.options.port || 8765;
// Try to connect as client first
this.socket = new plugins.net.Socket();
if (this.options.noDelay !== false) {
this.socket.setNoDelay(true);
}
if (this.options.timeout) {
this.socket.setTimeout(this.options.timeout);
}
this.socket.on('connect', () => {
this.connected = true;
this.setupSocketHandlers(this.socket);
this.emit('connect');
resolve();
});
this.socket.on('error', (error) => {
if (error.code === 'ECONNREFUSED') {
// No server exists, we should become the server
this.socket = null;
this.startServer(host, port).then(resolve).catch(reject);
}
else {
reject(error);
}
});
this.socket.connect(port, host);
});
}
/**
* Start as server
*/
async startServer(host, port) {
return new Promise((resolve, reject) => {
this.server = plugins.net.createServer((socket) => {
this.clients.add(socket);
if (this.options.noDelay !== false) {
socket.setNoDelay(true);
}
if (this.options.timeout) {
socket.setTimeout(this.options.timeout);
}
this.setupSocketHandlers(socket);
socket.on('close', () => {
this.clients.delete(socket);
});
});
this.server.on('error', reject);
this.server.listen(port, host, () => {
this.connected = true;
this.emit('connect');
resolve();
});
});
}
/**
* Setup socket event handlers
*/
setupSocketHandlers(socket) {
socket.on('data', (data) => {
this.parseIncomingData(data);
});
socket.on('error', (error) => {
this.handleError(error);
});
socket.on('close', () => {
this.connected = false;
this.emit('disconnect');
});
socket.on('timeout', () => {
this.handleError(new Error('Socket timeout'));
socket.destroy();
});
socket.on('drain', () => {
this.emit('drain');
});
}
/**
* Disconnect the transport
*/
async disconnect() {
if (this.socket) {
this.socket.destroy();
this.socket = null;
}
if (this.server) {
for (const client of this.clients) {
client.destroy();
}
this.clients.clear();
await new Promise((resolve) => {
this.server.close(() => resolve());
});
this.server = null;
}
this.connected = false;
this.emit('disconnect');
}
/**
* Send a message
*/
async send(message) {
const frame = this.frameMessage(message);
if (this.socket) {
// Client mode
return new Promise((resolve) => {
const success = this.socket.write(frame, (error) => {
if (error) {
this.handleError(error);
resolve(false);
}
else {
resolve(true);
}
});
// Handle backpressure
if (!success) {
this.socket.once('drain', () => resolve(true));
}
});
}
else if (this.server && this.clients.size > 0) {
// Server mode - broadcast to all clients
const promises = [];
for (const client of this.clients) {
promises.push(new Promise((resolve) => {
const success = client.write(frame, (error) => {
if (error) {
resolve(false);
}
else {
resolve(true);
}
});
if (!success) {
client.once('drain', () => resolve(true));
}
}));
}
const results = await Promise.all(promises);
return results.every(r => r);
}
return false;
}
}
/**
* Factory function to create appropriate transport based on platform and options
*/
export function createTransport(options) {
// If TCP is explicitly requested
if (options.host || options.port) {
return new TcpTransport(options);
}
// Platform-specific default transport
const platform = plugins.os.platform();
if (platform === 'win32') {
return new NamedPipeTransport(options);
}
else {
return new UnixSocketTransport(options);
}
}
//# 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