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Refactor project structure: remove app.js, update config.json for environment-specific settings, enhance package.json with new scripts and dependencies, and convert websockets.js to ES module syntax with Keycloak authentication integration.

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This commit is contained in:
Tom Butcher 2025-06-29 22:39:23 +01:00
parent 15cb1a03b6
commit bf56234c4b
24 changed files with 1931 additions and 483 deletions
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# FarmControl WebSocket Service
A WebSocket microservice for FarmControl that handles real-time communication and distributed locking using etcd.
## Features
- Real-time WebSocket communication
- Distributed locking using etcd
- Keycloak authentication integration
- MongoDB integration for user management
- Event streaming and notifications
## Prerequisites
- Node.js (v16 or higher)
- etcd server
- MongoDB server
- Keycloak server (for authentication)
## Installation
1. Clone the repository
2. Install dependencies:
```bash
npm install
```
## Configuration
The application uses `config.json` for configuration. Update the following sections:
### Etcd Configuration
```json
{
"database": {
"etcd": {
"host": "localhost",
"port": 2379
}
}
}
```
### MongoDB Configuration
```json
{
"database": {
"mongo": {
"url": "mongodb://localhost:27017/farmcontrol"
}
}
}
```
### Authentication Configuration
```json
{
"auth": {
"enabled": true,
"keycloak": {
"url": "https://your-keycloak-server",
"realm": "your-realm",
"clientId": "your-client-id",
"clientSecret": "your-client-secret"
}
}
}
```
## Running the Application
### Development
```bash
npm run dev
```
### Production
```bash
npm start
```
## Etcd Setup
### Installation
#### Using Docker
```bash
docker run -d --name etcd \
-p 2379:2379 \
-p 2380:2380 \
quay.io/coreos/etcd:v3.5.0 \
/usr/local/bin/etcd \
--advertise-client-urls http://0.0.0.0:2379 \
--listen-client-urls http://0.0.0.0:2379
```
#### Using Homebrew (macOS)
```bash
brew install etcd
etcd
```
#### Using apt (Ubuntu/Debian)
```bash
sudo apt-get install etcd
sudo systemctl start etcd
```
### Verification
Test that etcd is running:
```bash
curl http://localhost:2379/version
```
## Migration from Redis
This application was migrated from Redis to etcd. The main changes include:
1. **Stream-like functionality**: Redis streams are replaced with etcd key-value pairs using a prefix pattern
2. **Hash-like functionality**: Redis hashes are replaced with etcd key-value pairs using a prefix pattern
3. **Pub/Sub**: Redis pub/sub is replaced with etcd watchers
4. **Connection management**: Simplified connection handling with automatic reconnection
### Key Differences
- **Data structure**: etcd uses a flat key-value store, so we simulate Redis data structures using key prefixes
- **Streams**: Instead of Redis streams, we use etcd keys with timestamps and random suffixes
- **Watching**: etcd watchers provide real-time notifications for key changes
- **Transactions**: etcd supports atomic operations for distributed locking
## API Endpoints
The service exposes WebSocket endpoints for:
- **Lock management**: Lock/unlock objects with real-time notifications
- **Authentication**: Keycloak-based authentication
- **Real-time updates**: Stream-based event notifications
## Development
### Project Structure
```
src/
├── auth/ # Authentication logic
├── database/ # Database connections (etcd, mongo)
├── lock/ # Distributed locking
├── notification/ # Notification management
├── socket/ # WebSocket handling
└── index.js # Main application entry point
```
### Adding New Features
1. **Database operations**: Use the `etcdServer` instance for etcd operations
2. **WebSocket events**: Extend the `SocketClient` class
3. **Authentication**: Extend the `KeycloakAuth` class
## Troubleshooting
### Common Issues
1. **Etcd connection failed**: Ensure etcd is running on the configured host and port
2. **Authentication errors**: Verify Keycloak configuration and credentials
3. **MongoDB connection issues**: Check MongoDB server status and connection string
### Logging
The application uses log4js for logging. Set the log level in the configuration:
```json
{
"server": {
"logLevel": "debug"
}
}
```
Available log levels: `trace`, `debug`, `info`, `warn`, `error`

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app.js
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const log4js = require("log4js");
const os = require("os");
const config = require("./config.json");
const WebSocketServer = require("./src/websockets.js").WebSocketServer;
const logger = log4js.getLogger("App");
logger.level = config.logLevel;
function showSystemInfo() {
logger.info("=== System Info ===")
logger.info("Hostname:", os.hostname());
logger.info("Memory:", os.totalmem() / 1024 / 1024 + "mb");
console.log("");
}
showSystemInfo();
logger.info("Web Socket Server Starting...");
var server = new WebSocketServer();
server.start(5050);

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{ {
"logLevel": "trace", "development": {
"jwt_secret": "secret123", "server": {
"mongo_uri": "mongodb://localhost:27017/socketio" "port": 9090,
} "logLevel": "trace"
},
"auth": {
"enabled": true,
"keycloak": {
"url": "https://auth.tombutcher.work",
"realm": "master",
"clientId": "farmcontrol-client",
"clientSecret": "GPyh59xctRX83yfKWb83ShK6VEwHIvLF"
},
"requiredRoles": []
},
"database": {
"etcd": {
"host": "localhost",
"port": 2379
},
"mongo": {
"url": "mongodb://192.168.68.53:27017/farmcontrol"
}
}
},
"production": {
"server": {
"port": 8081,
"logLevel": "info"
},
"auth": {
"enabled": true,
"keycloak": {
"url": "https://auth.tombutcher.work",
"realm": "master",
"clientId": "farmcontrol-client",
"clientSecret": "GPyh59xctRX83yfKWb83ShK6VEwHIvLF"
},
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"database": {
"etcd": {
"host": "localhost",
"port": 2379
},
"mongo": {
"url": "mongodb://farmcontrol.tombutcher.local:27017/farmcontrol"
}
}
}
}

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}
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"dev": true,
"license": "MIT",
"bin": {
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},
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},
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}
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"license": "MIT",
"dependencies": {
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},
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}
},
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} }
}, },
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"long": "^5.0.0"
},
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} }
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}
},
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"is-fullwidth-code-point": "^3.0.0",
"strip-ansi": "^6.0.1"
},
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}
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@ -4732,7 +5217,6 @@
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@ -4790,6 +5274,22 @@
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} }
}, },
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"dev": true,
"license": "MIT",
"dependencies": {
"@pkgr/core": "^0.2.4"
},
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},
"funding": {
"url": "https://opencollective.com/synckit"
}
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},
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}
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17
package.json
View File

@ -3,14 +3,23 @@
"version": "1.0.0", "version": "1.0.0",
"description": "Farmcontrol Web Socket microservice", "description": "Farmcontrol Web Socket microservice",
"main": "app.js", "main": "app.js",
"type": "module",
"scripts": { "scripts": {
"test": "echo \"Error: no test specified\" && exit 1", "test": "echo \"Error: no test specified\" && exit 1",
"start": "node app.js", "start": "node src/index.js",
"dev": "nodemon app.js" "dev": "nodemon src/index.js",
"lint": "eslint src/",
"lint:fix": "eslint src/ --fix",
"format": "prettier --write \"src/**/*.{js,json}\"",
"format:check": "prettier --check \"src/**/*.{js,json}\"",
"fix": "npm run lint:fix && npm run format"
}, },
"author": "Tom Butcher", "author": "Tom Butcher",
"license": "ISC", "license": "ISC",
"dependencies": { "dependencies": {
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"dotenv": "^16.4.5",
"etcd3": "^1.1.2",
"express": "^4.19.2", "express": "^4.19.2",
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"standard": "^17.1.0" "standard": "^17.1.0"
} }
} }

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147
src/auth/auth.js Normal file
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@ -0,0 +1,147 @@
// auth.js - Keycloak authentication handler
import axios from 'axios';
import jwt from 'jsonwebtoken';
import log4js from 'log4js';
// Load configuration
import { loadConfig } from '../config.js';
const config = loadConfig();
const logger = log4js.getLogger('Auth');
logger.level = config.server.logLevel;
export class KeycloakAuth {
constructor(config) {
this.config = config.auth;
this.tokenCache = new Map(); // Cache for verified tokens
}
// Verify a token with Keycloak server
async verifyToken(token) {
// Check cache first
if (this.tokenCache.has(token)) {
const cachedInfo = this.tokenCache.get(token);
if (cachedInfo.expiresAt > Date.now()) {
return { valid: true, user: cachedInfo.user };
} else {
// Token expired, remove from cache
this.tokenCache.delete(token);
}
}
try {
// Verify token with Keycloak introspection endpoint
const response = await axios.post(
`${this.config.keycloak.url}/realms/${this.config.keycloak.realm}/protocol/openid-connect/token/introspect`,
new URLSearchParams({
token,
client_id: this.config.keycloak.clientId,
client_secret: this.config.keycloak.clientSecret
}),
{
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
}
);
const introspection = response.data;
if (!introspection.active) {
logger.info('Token is not active');
return { valid: false };
}
// Verify required roles if configured
if (this.config.requiredRoles && this.config.requiredRoles.length > 0) {
const hasRequiredRole = this.checkRoles(
introspection,
this.config.requiredRoles
);
if (!hasRequiredRole) {
logger.info("User doesn't have required roles");
return { valid: false };
}
}
// Parse token to extract user info
const decodedToken = jwt.decode(token);
const user = {
id: decodedToken.sub,
username: decodedToken.preferred_username,
email: decodedToken.email,
name: decodedToken.name,
roles: this.extractRoles(decodedToken)
};
// Cache the verified token
const expiresAt = introspection.exp * 1000; // Convert to milliseconds
this.tokenCache.set(token, { expiresAt, user });
return { valid: true, user };
} catch (error) {
logger.error('Token verification error:', error.message);
return { valid: false };
}
}
// Extract roles from token
extractRoles(token) {
const roles = [];
// Extract realm roles
if (token.realm_access && token.realm_access.roles) {
roles.push(...token.realm_access.roles);
}
// Extract client roles
if (token.resource_access) {
for (const client in token.resource_access) {
if (token.resource_access[client].roles) {
roles.push(
...token.resource_access[client].roles.map(
role => `${client}:${role}`
)
);
}
}
}
return roles;
}
// Check if user has required roles
checkRoles(tokenInfo, requiredRoles) {
// Extract roles from token
const userRoles = this.extractRoles(tokenInfo);
// Check if user has any of the required roles
return requiredRoles.some(role => userRoles.includes(role));
}
}
// Socket.IO middleware for authentication
export function createAuthMiddleware(auth) {
return async (socket, next) => {
const { token } = socket.handshake.auth;
if (!token) {
return next(new Error('Authentication token is required'));
}
try {
const authResult = await auth.verifyToken(token);
if (!authResult.valid) {
return next(new Error('Invalid authentication token'));
}
// Attach user information to socket
socket.user = authResult.user;
next();
} catch (err) {
logger.error('Authentication error:', err);
next(new Error('Authentication failed'));
}
};
}

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// config.js - Configuration handling
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
// Configure paths relative to this file
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const CONFIG_PATH = path.resolve(__dirname, '../config.json');
// Determine environment
const NODE_ENV = process.env.NODE_ENV || 'development';
// Load config file
export function loadConfig() {
try {
if (!fs.existsSync(CONFIG_PATH)) {
throw new Error(`Configuration file not found at ${CONFIG_PATH}`);
}
const configData = fs.readFileSync(CONFIG_PATH, 'utf8');
const config = JSON.parse(configData);
if (!config[NODE_ENV]) {
throw new Error(
`Configuration for environment '${NODE_ENV}' not found in config.json`
);
}
return config[NODE_ENV];
} catch (err) {
console.error('Error loading config:', err);
throw err;
}
}
// Get current environment
export function getEnvironment() {
return NODE_ENV;
}

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import { Etcd3 } from 'etcd3';
import log4js from 'log4js';
import { loadConfig } from '../config.js';
const config = loadConfig();
const logger = log4js.getLogger('Etcd');
logger.level = config.server.logLevel;
class EtcdServer {
constructor() {
this.client = null;
this.watchers = new Map();
const etcdConfig = config.database?.etcd || config.database; // fallback for production config
const host = etcdConfig.host || 'localhost';
const port = etcdConfig.port || 2379;
this.hosts = [`${host}:${port}`];
logger.debug(
`EtcdServer constructor: hosts set to ${JSON.stringify(this.hosts)}`
);
}
async connect() {
if (!this.client) {
logger.info('Connecting to Etcd...');
logger.debug(
`Creating Etcd client with hosts ${JSON.stringify(this.hosts)}`
);
this.client = new Etcd3({
hosts: this.hosts
});
// Test connection
try {
await this.client.get('test-connection').string();
logger.debug('Etcd client connected successfully.');
} catch (error) {
if (error.code === 'NOT_FOUND') {
logger.debug(
'Etcd client connected successfully (test key not found as expected).'
);
} else {
throw error;
}
}
} else {
logger.debug('Etcd client already exists, skipping connection.');
}
return this.client;
}
async getClient() {
logger.trace('Checking if Etcd client exists.');
if (!this.client) {
logger.debug('No client found, calling connect().');
await this.connect();
}
logger.trace('Returning Etcd client.');
return this.client;
}
// Hash-like functionality using etcd
async set(key, value) {
const client = await this.getClient();
const stringValue =
typeof value === 'string' ? value : JSON.stringify(value);
await client.put(key).value(stringValue);
logger.debug(`Set key: ${key}, value: ${stringValue}`);
return true;
}
async get(key) {
const client = await this.getClient();
try {
const value = await client.get(key).string();
logger.debug(`Retrieved key: ${key}, value: ${value}`);
// Try to parse as JSON, fallback to string
try {
return JSON.parse(value);
} catch {
return value;
}
} catch (error) {
if (error.code === 'NOT_FOUND') {
logger.debug(`Key not found: ${key}`);
return null;
}
throw error;
}
}
async delete(key) {
const client = await this.getClient();
try {
await client.delete().key(key);
logger.debug(`Deleted key: ${key}`);
return true;
} catch (error) {
if (error.code === 'NOT_FOUND') {
logger.debug(`Key not found for deletion: ${key}`);
return false;
}
throw error;
}
}
async onPrefixEvent(prefix, callback) {
const client = await this.getClient();
logger.debug(`Setting up watcher for prefix events: ${prefix}`);
client
.watch()
.prefix(prefix)
.create()
.then(watcher => {
// Handle put events
watcher.on('put', (kv, previous) => {
logger.debug(`Prefix put event detected: ${prefix}, key: ${kv.key}`);
try {
const value = kv.value.toString();
let parsedValue;
try {
parsedValue = JSON.parse(value);
} catch {
parsedValue = value;
}
callback(kv.key.toString(), parsedValue, kv, previous);
} catch (error) {
logger.error(
`Error in onPrefixEvent put callback for prefix ${prefix}:`,
error
);
}
});
// Handle delete events
watcher.on('delete', (kv, previous) => {
logger.debug(
`Prefix delete event detected: ${prefix}, key: ${kv.key}`
);
try {
callback(kv.key.toString(), null, kv, previous);
} catch (error) {
logger.error(
`Error in onPrefixEvent delete callback for prefix ${prefix}:`,
error
);
}
});
// Store watcher with a unique key
const watcherKey = `event:${prefix}`;
this.watchers.set(watcherKey, watcher);
});
}
async onPrefixPut(prefix, callback) {
const client = await this.getClient();
logger.debug(`Setting up watcher for prefix put: ${prefix}`);
client
.watch()
.prefix(prefix)
.create()
.then(watcher => {
watcher.on('put', (kv, previous) => {
logger.debug(`Prefix put event detected: ${prefix}, key: ${kv.key}`);
try {
const value = kv.value.toString();
let parsedValue;
try {
parsedValue = JSON.parse(value);
} catch {
parsedValue = value;
}
callback(kv.key.toString(), parsedValue, kv, previous);
} catch (error) {
logger.error(
`Error in onPrefixPut callback for prefix ${prefix}:`,
error
);
}
});
this.watchers.set(`put:${prefix}`, watcher);
});
}
async onPrefixDelete(prefix, callback) {
const client = await this.getClient();
logger.debug(`Setting up watcher for prefix delete: ${prefix}`);
client
.watch()
.prefix(prefix)
.create()
.then(watcher => {
watcher.on('delete', (kv, previous) => {
logger.debug(
`Prefix delete event detected: ${prefix}, key: ${kv.key}`
);
try {
callback(kv.key.toString(), kv, previous);
} catch (error) {
logger.error(
`Error in onPrefixDelete callback for prefix ${prefix}:`,
error
);
}
});
this.watchers.set(`delete:${prefix}`, watcher);
});
}
async removeWatcher(prefix, type = 'put') {
const watcherKey = `${type}:${prefix}`;
const watcher = this.watchers.get(watcherKey);
if (watcher) {
logger.debug(`Removing watcher: ${watcherKey}`);
watcher.removeAllListeners();
await watcher.close();
this.watchers.delete(watcherKey);
return true;
} else {
logger.debug(`Watcher not found: ${watcherKey}`);
return false;
}
}
async disconnect() {
logger.info('Disconnecting from Etcd...');
// Stop all watchers
for (const [key, watcher] of this.watchers) {
logger.debug(`Stopping watcher: ${key}`);
watcher.removeAllListeners();
await watcher.close();
}
this.watchers.clear();
if (this.client) {
await this.client.close();
this.client = null;
logger.info('Disconnected from Etcd');
}
}
}
const etcdServer = new EtcdServer();
export { EtcdServer, etcdServer };

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import mongoose from 'mongoose';
import { loadConfig } from '../config.js';
import log4js from 'log4js';
const config = loadConfig();
const logger = log4js.getLogger('Mongo DB');
logger.level = config.server.logLevel;
class MongoServer {
constructor() {
this.connected = false;
this.connecting = false;
this.connectionPromise = null;
this.url = config.database.mongo.url;
}
connect() {
if (this.connected) return mongoose.connection;
if (this.connecting) return this.connectionPromise;
this.connecting = true;
logger.info('Connecting to MongoDB...');
logger.debug('Connection URL:', this.url);
this.connectionPromise = mongoose
.connect(this.url, {})
.then(conn => {
this.connected = true;
logger.info('Database connected.');
return conn.connection;
})
.catch(err => {
this.connected = false;
logger.error('MongoDB connection error:', err);
throw err;
})
.finally(() => {
this.connecting = false;
});
return this.connectionPromise;
}
async getConnection() {
if (!this.connected) {
await this.connect();
}
return mongoose.connection;
}
}
const mongoServer = new MongoServer();
export { MongoServer, mongoServer };

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import mongoose from 'mongoose';
const userSchema = new mongoose.Schema(
{
username: { required: true, type: String },
name: { required: true, type: String },
firstName: { required: false, type: String },
lastName: { required: false, type: String },
email: { required: true, type: String }
},
{ timestamps: true }
);
userSchema.virtual('id').get(function () {
return this._id.toHexString();
});
userSchema.set('toJSON', { virtuals: true });
export const userModel = mongoose.model('User', userSchema);

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import { loadConfig } from './config.js';
import { KeycloakAuth } from './auth/auth.js';
import { SocketManager } from './socket/socketmanager.js';
import { etcdServer } from './database/etcd.js';
import express from 'express';
import log4js from 'log4js';
import http from 'http';
import { mongoServer } from './database/mongo.js';
(async () => {
// Load configuration
const config = loadConfig();
// Setup logger
const logger = log4js.getLogger('FarmControl API WS');
logger.level = config.server.logLevel;
// Create Express app and HTTP server
const app = express();
const server = http.createServer(app);
// Setup Keycloak Integration
const keycloakAuth = new KeycloakAuth(config);
new SocketManager(keycloakAuth, server);
// Connect to Etcd (await)
try {
await etcdServer.connect();
logger.info('Connected to Etcd');
} catch (err) {
logger.error('Failed to connect to Etcd:', err);
throw err;
}
// Connect to Mongo DB (await)
try {
await mongoServer.connect();
logger.info('Connected to Mongo DB');
} catch (err) {
logger.error('Failed to connect to Mongo DB:', err);
throw err;
}
// Start HTTP server
server.listen(config.server.port, () => {
logger.info(`Server listening on port ${config.server.port}`);
});
process.on('SIGINT', async () => {
logger.info('Shutting down...');
await etcdServer.disconnect();
});
})();

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import { etcdServer } from '../database/etcd.js';
import log4js from 'log4js';
import { loadConfig } from '../config.js';
const config = loadConfig();
// Setup logger
const logger = log4js.getLogger('Lock Manager');
logger.level = config.server.logLevel;
/**
* LockManager handles distributed locking using Etcd and broadcasts lock events via websockets.
*/
export class LockManager {
constructor(socketManager) {
this.socketManager = socketManager;
this.setupLocksListeners();
}
async lockObject(object) {
// Add a 'lock' event to the 'locks' stream
logger.debug('Locking object:', object._id);
try {
await etcdServer.set(`/locks/${object.type}s/${object._id}`, object);
logger.info(`Lock event to id: ${object._id}`);
return true;
} catch (err) {
logger.error(`Error adding lock event to: ${object._id}:`, err);
throw err;
}
}
async unlockObject(object) {
// Add an 'unlock' event to the 'locks' stream
const key = `/locks/${object.type}s/${object._id}`;
console.log('unlocking');
try {
logger.debug('Checking user can unlock:', object._id);
const lockEvent = await etcdServer.get(key);
if (lockEvent?.user === object.user) {
logger.debug('Unlocking object:', object._id);
await etcdServer.delete(key);
logger.info(`Unlocked object: ${object._id}`);
return true;
}
} catch (err) {
logger.error(`Error unlocking object ${object._id}:`, err);
throw err;
}
}
async getObjectLock(object) {
// Get the current lock status of an object and broadcast it
logger.info('Getting lock status for object:', object._id);
try {
const lockKey = `/locks/${object.type}s/${object._id}`;
const lockValue = await etcdServer.get(lockKey);
if (lockValue) {
// Object is locked
logger.debug(`Object ${object._id} is locked`);
return {
...lockValue,
locked: true
};
} else {
// Object is not locked
logger.debug(`Object ${object._id} is not locked`);
return {
_id: object._id,
locked: false
};
}
} catch (err) {
logger.error(`Error getting lock status for object ${object._id}:`, err);
throw err;
}
}
setupLocksListeners() {
etcdServer.onPrefixPut('/locks', (key, value) => {
const id = key.split('/').pop();
logger.debug('Lock object event:', id);
this.socketManager.broadcast('notify_lock_update', {
...value,
locked: true
});
});
etcdServer.onPrefixDelete('/locks', key => {
const id = key.split('/').pop();
logger.debug('Unlock object event:', id);
this.socketManager.broadcast('notify_lock_update', {
_id: id,
locked: false
});
});
logger.info('Subscribed to Etcd stream for lock changes.');
}
}

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import log4js from 'log4js';
// Load configuration
import { loadConfig } from '../config.js';
import { userModel } from '../database/user.schema.js';
const config = loadConfig();
const logger = log4js.getLogger('Socket Client');
logger.level = config.server.logLevel;
export class SocketClient {
constructor(socket, socketManager) {
this.socket = socket;
this.user = null;
this.socketManager = socketManager;
this.lockManager = socketManager.lockManager;
this.updateManager = socketManager.updateManager;
}
async initUser() {
if (this.socket?.user?.username) {
try {
const userDoc = await userModel
.findOne({ username: this.socket.user.username })
.lean();
this.user = userDoc;
logger.debug('ID:', this.user._id.toString());
logger.debug('Name:', this.user.name);
logger.debug('Username:', this.user.username);
logger.debug('Email:', this.user.email);
this.setupSocketEventHandlers();
} catch (err) {
logger.error('Error looking up user by username:', err);
this.user = null;
}
}
}
setupSocketEventHandlers() {
this.socket.on('lock', this.handleLockEvent.bind(this));
this.socket.on('unlock', this.handleUnlockEvent.bind(this));
this.socket.on('getLock', this.handleGetLockEvent.bind(this));
this.socket.on('update', this.handleUpdateEvent.bind(this));
}
async handleLockEvent(data) {
// data: { _id: string, params?: object }
if (!data || !data._id) {
this.socket.emit('lock_result', {
success: false,
error: 'Invalid lock event data'
});
return;
}
data = { ...data, user: this.user._id.toString() };
try {
await this.lockManager.lockObject(data);
} catch (err) {
logger.error('Lock event error:', err);
this.socket.emit('lock_result', { success: false, error: err.message });
}
}
async handleUnlockEvent(data) {
// data: { _id: string }
if (!data || !data._id) {
this.socket.emit('unlock_result', {
success: false,
error: 'Invalid unlock event data'
});
return;
}
data = { ...data, user: this.user._id.toString() };
try {
await this.lockManager.unlockObject(data);
} catch (err) {
logger.error('Unlock event error:', err);
this.socket.emit('unlock_result', { success: false, error: err.message });
}
}
async handleGetLockEvent(data, callback) {
// data: { _id: string }
if (!data || !data._id) {
callback({
error: 'Invalid getLock event data'
});
return;
}
try {
const lockEvent = await this.lockManager.getObjectLock(data);
callback(lockEvent);
} catch (err) {
logger.error('GetLock event error:', err);
callback({
error: err.message
});
}
}
async handleUpdateEvent(data) {
// data: { _id: string, type: string, ...otherProperties }
if (!data || !data._id || !data.type) {
return;
}
try {
// Add user information to the update data
const updateData = {
...data,
updatedAt: new Date()
};
// Use the updateManager to handle the update
if (this.updateManager) {
await this.updateManager.updateObject(updateData);
} else {
throw new Error('UpdateManager not available');
}
} catch (err) {
logger.error('Update event error:', err);
}
}
handleDisconnect() {
logger.info('External client disconnected:', this.socket.user?.username);
}
}

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// server.js - HTTP and Socket.IO server setup
import { Server } from 'socket.io';
import { createAuthMiddleware } from '../auth/auth.js';
import log4js from 'log4js';
// Load configuration
import { loadConfig } from '../config.js';
import { SocketClient } from './socketclient.js';
import { LockManager } from '../lock/lockmanager.js';
import { UpdateManager } from '../updates/updatemanager.js';
const config = loadConfig();
const logger = log4js.getLogger('Socket Manager');
logger.level = config.server.logLevel;
export class SocketManager {
constructor(auth, server) {
this.socketClientConnections = new Map();
this.lockManager = new LockManager(this);
this.updateManager = new UpdateManager(this);
// Use the provided HTTP server
// Create Socket.IO server
const io = new Server(server, {
cors: {
origin: config.server.corsOrigins || '*',
methods: ['GET', 'POST']
}
});
// Apply authentication middleware
io.use(createAuthMiddleware(auth));
// Handle client connections
io.on('connection', async socket => {
logger.info('External client connected:', socket.user?.username);
await this.addClient(socket);
});
this.io = io;
this.server = server;
}
async addClient(socket) {
const client = new SocketClient(socket, this, this.lockManager);
await client.initUser();
this.socketClientConnections.set(socket.id, client);
logger.info('External client connected:', socket.user?.username);
// Handle disconnection
socket.on('disconnect', () => {
logger.info('External client disconnected:', socket.user?.username);
this.removeClient(socket.id);
});
}
removeClient(socketClientId) {
const socketClient = this.socketClientConnections.get(socketClientId);
if (socketClient) {
this.socketClientConnections.delete(socketClientId);
logger.info(
'External client disconnected:',
socketClient.socket.user?.username
);
}
}
getSocketClient(clientId) {
return this.socketClientConnections.get(clientId);
}
getAllSocketClients() {
return Array.from(this.socketClientConnections.values());
}
broadcast(event, data, excludeClientId = null) {
for (const [clientId, socketClient] of this.socketClientConnections) {
if (excludeClientId !== clientId) {
socketClient.socket.emit(event, data);
}
}
}
}

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import { etcdServer } from '../database/etcd.js';
import log4js from 'log4js';
import { loadConfig } from '../config.js';
const config = loadConfig();
// Setup logger
const logger = log4js.getLogger('Update Manager');
logger.level = config.server.logLevel;
/**
* UpdateManager handles tracking object updates using Etcd and broadcasts update events via websockets.
*/
export class UpdateManager {
constructor(socketManager) {
this.socketManager = socketManager;
this.setupUpdatesListeners();
}
async updateObject(object) {
// Add an 'update' event to the 'updates' stream
logger.debug('Updating object:', object._id);
try {
const updateData = {
_id: object._id,
type: object.type,
updatedAt: new Date().toISOString()
};
await etcdServer.set(
`/updates/${object.type}s/${object._id}`,
updateData
);
logger.info(`Update event for id: ${object._id}`);
} catch (err) {
logger.error(`Error adding update event to: ${object._id}:`, err);
throw err;
}
}
setupUpdatesListeners() {
etcdServer.onPrefixPut('/updates', (key, value) => {
const id = key.split('/').pop();
logger.debug('Update object event:', id);
this.socketManager.broadcast('notify_object_update', {
...value
});
});
logger.info('Subscribed to Etcd stream for update changes.');
}
}

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// WebSocketServer.js // WebSocketServer.js
const express = require("express"); import express from 'express';
const http = require("http"); import http from 'http';
const socketIo = require("socket.io"); import { Server as SocketIo } from 'socket.io';
const { MongoClient } = require("mongodb"); import log4js from 'log4js';
const socketioJwt = require("socketio-jwt"); import dotenv from 'dotenv';
const log4js = require("log4js"); import { KeycloakAuth, createAuthMiddleware } from './auth/auth.js';
const config = require("../config.json");
const { trace } = require("console");
const logger = log4js.getLogger("Web Sockets"); dotenv.config();
logger.level = config.logLevel;
class WebSocketServer { const logger = log4js.getLogger('Web Sockets');
logger.level = process.env.LOG_LEVEL;
export default class WebSocketServer {
constructor() { constructor() {
this.app = express(); this.app = express();
this.server = http.createServer(this.app); this.server = http.createServer(this.app);
this.io = socketIo(this.server, { this.io = new SocketIo(this.server, {
cors: { cors: {
origin: "*", origin: '*'
}, },
maxHttpBufferSize: 1e8 maxHttpBufferSize: 1e8
}); });
this.JWT_SECRET = process.env.JWT_SECRET || config.jwt_secret; this.hostServices = [];
this.mongoUri = process.env.MONGO_URI || config.mongo_uri; this.userServices = [];
this.dbName = "farmcontrol"; // DB Name
this.hostSockets = [];
this.userSockets = [];
}
async connectToMongo() {
try {
const client = new MongoClient(this.mongoUri, {});
await client.connect();
this.db = client.db(this.dbName);
logger.info("Connected to MongoDB");
this.clearHostsCollection();
} catch (err) {
logger.error("MongoDB connection error:", err);
}
} }
configureMiddleware() { configureMiddleware() {
// Middleware for JWT authentication // Middleware for Keycloak authentication
this.io.use( const keycloakAuth = new KeycloakAuth();
socketioJwt.authorize({ this.io.use(createAuthMiddleware(keycloakAuth));
secret: this.JWT_SECRET,
handshake: true,
})
);
}
setupSocketIO() {
this.io.on("connection", (socket) => {
var connectionType = "user";
var hostId;
var id, email;
if (socket.decoded_token.hasOwnProperty("hostId")) {
var connectionType = "host";
hostId = socket.decoded_token.hostId;
logger.info("Host connected:", hostId);
this.hostSockets.push(socket.id);
this.handleHostOnlineEvent({ hostId });
} else {
id = socket.decoded_token.id;
email = socket.decoded_token.email;
logger.info("User connected:", id);
this.userSockets.push(socket.id);
}
socket.on("disconnect", () => {
if (connectionType == "host") {
logger.info("Host " + socket.decoded_token.hostId + " disconnected.");
this.hostSockets = this.hostSockets.filter(id => id !== socket.id);
this.handleHostOfflineEvent({ hostId: hostId });
} else {
logger.info("User " + socket.decoded_token.id + " disconnected.")
this.userSockets = this.userSockets.filter(id => id !== socket.id);
}
});
socket.on("status", (data) => {
logger.info("Setting", data.remoteAddress, "status to", data.status);
if (data.type == "printer") {
this.handlePrinterStatusEvent(data);
}
});
socket.on("online", (data) => {
logger.info("Setting", data.remoteAddress, "to online.");
if (data.type == "printer") {
this.handlePrinterOnlineEvent(data, socket);
}
});
socket.on("offline", (data) => {
logger.info("Setting", data.remoteAddress, "to offline.");
if (data.type == "printer") {
this.handlePrinterOfflineEvent(data);
}
});
socket.on("join", (data) => {
if (data.remoteAddress) {
logger.trace("Joining room", data.remoteAddress);
socket.join(data.remoteAddress);
}
});
socket.on("leave", (data) => {
if (data.remoteAddress) {
logger.trace("Leaving room", data.remoteAddress);
socket.leave(data.remoteAddress);
}
});
socket.on("temperature", (data) => {
if (connectionType == "host") {
socket.to(data.remoteAddress).emit("temperature", data);
}
});
socket.on("command", (data) => {
if (connectionType == "user") {
socket.to(data.remoteAddress).emit(data.type, data);
}
});
});
}
async clearHostsCollection() {
try {
if (!this.db) {
await this.connectToMongo();
}
// Delete all documents from hosts collection
const deleteResult = await this.db.collection("hosts").deleteMany({});
logger.info(
`Deleted ${deleteResult.deletedCount} documents from hosts collection`
);
} catch (error) {
logger.error("Error clearing hosts collection:", error);
}
}
async handlePrinterOnlineEvent(data, socket) {
try {
if (!this.db) {
await this.connectToMongo();
}
// Check if data.remoteAddress exists in printers collection
const existingPrinter = await this.db
.collection("printers")
.findOne({ remoteAddress: data.remoteAddress });
if (existingPrinter) {
// If exists, update the document
const updateResult = await this.db.collection("printers").updateOne(
{ remoteAddress: data.remoteAddress },
{
$set: {
online: true,
status: { type: "Online" },
connectedAt: new Date(),
hostId: data.hostId, // Assuming hostId is passed as a parameter to handleIdentifyEvent
},
}
);
if (updateResult.modifiedCount > 0) {
logger.info(`Printer updated: ${data.remoteAddress}`);
} else {
logger.warn(`Printer not updated: ${data.remoteAddress}`);
}
} else {
// If not exists, insert a new document
const insertData = {
remoteAddress: data.remoteAddress,
hostId: data.hostId,
online: true,
status: { type: "Online" },
connectedAt: new Date(),
friendlyName: "",
loadedFillament: null,
};
const insertResult = await this.db
.collection("printers")
.insertOne(insertData);
if (insertResult.insertedCount > 0) {
logger.info(`New printer added: ${data.remoteAddress}`);
} else {
logger.warn(`Failed to add new printer: ${data.remoteAddress}`);
}
}
const onlineData = {
remoteAddress: data.remoteAddress,
hostId: data.hostId,
online: true,
status: { type: "Online" },
connectedAt: new Date(),
};
logger.trace("Sending online data", onlineData)
this.sendStatusToUserSockets(onlineData);
// Join socket room using remoteAddress as name
//logger.trace("Joining room", data.remoteAddress);
logger.trace("Joining room", data.remoteAddress);
socket.join(data.remoteAddress);
} catch (error) {
logger.error("Error handling online event:", error);
}
}
async handlePrinterStatusEvent(data) {
try {
if (!this.db) {
await this.connectToMongo();
}
// Check if data.remoteAddress exists in printers collection
const existingPrinter = await this.db
.collection("printers")
.findOne({ remoteAddress: data.remoteAddress });
if (existingPrinter) {
// If exists, update the document
const updateResult = await this.db.collection("printers").updateOne(
{ remoteAddress: data.remoteAddress },
{
$set: {
status: data.status,
},
}
);
if (updateResult.modifiedCount > 0) {
logger.info(`Printer updated: ${data.remoteAddress}`);
} else {
logger.warn(`Printer not updated: ${data.remoteAddress}`);
}
} else {
}
const onlineData = {
remoteAddress: data.remoteAddress,
hostId: data.hostId,
online: true,
connectedAt: new Date(),
};
logger.trace("Sending status data", onlineData)
this.sendStatusToUserSockets(data);
} catch (error) {
logger.error("Error handling status event:", error);
}
}
async handlePrinterOfflineEvent(data) {
try {
if (!this.db) {
await this.connectToMongo();
}
// Check if data.remoteAddress exists in printers collection
const existingPrinter = await this.db
.collection("printers")
.findOne({ remoteAddress: data.remoteAddress });
if (existingPrinter) {
// If exists, update the document
const updateResult = await this.db.collection("printers").updateOne(
{ remoteAddress: data.remoteAddress },
{
$set: {
online: false,
status: { type: "Offline" },
connectedAt: null,
hostId: data.hostId, // Assuming hostId is passed as a parameter to handleIdentifyEvent
},
}
);
if (updateResult.modifiedCount > 0) {
logger.info(`Printer updated: ${data.remoteAddress}`);
} else {
logger.warn(`Printer not updated: ${data.remoteAddress}`);
}
} else {
// If not exists, insert a new document
const insertResult = await this.db.collection("printers").insertOne({
remoteAddress: data.remoteAddress,
hostId: data.hostId,
online: false,
status: { type: "Offline" },
connectedAt: null,
friendlyName: "",
loadedFillament: null,
});
if (insertResult.insertedCount > 0) {
logger.info(`New printer added: ${data.remoteAddress}`);
} else {
logger.warn(`Failed to add new printer: ${data.remoteAddress}`);
}
}
const offlineData = {
remoteAddress: data.remoteAddress,
hostId: data.hostId,
online: false,
status: { type: "Offline" },
connectedAt: null,
};
logger.trace("Sending offline data", offlineData)
this.sendStatusToUserSockets(offlineData);
} catch (error) {
logger.error("Error handling offline event:", error);
}
}
async handleHostOnlineEvent(data) {
try {
if (!this.db) {
await this.connectToMongo();
}
// Add new entry to hosts collection.
const insertResult = await this.db.collection("hosts").insertOne({
hostId: data.hostId,
online: true,
connectedAt: new Date(),
});
if (insertResult.insertedCount != 0) {
logger.info(`New host added: ${data.hostId}`);
} else {
logger.warn(`Failed to add new host: ${data.hostId}`);
}
} catch (error) {
logger.error("Error handling online event:", error);
}
}
async handleHostOfflineEvent(data) {
//try {
if (!this.db) {
await this.connectToMongo();
}
// Delete user from hosts collection
const deleteUserResult = await this.db
.collection("hosts")
.deleteOne({ hostId: data.hostId });
if (deleteUserResult.deletedCount > 0) {
logger.info(`User deleted from hosts collection: ${data.hostId}`);
} else {
logger.warn(`User not found in hosts collection: ${data.hostId}`);
}
// Update all printers with matching hostId
const updatePrintersResult = await this.db
.collection("printers")
.updateMany(
{ hostId: data.hostId },
{
$set: {
online: false,
status: { type: "Offline" },
connectedAt: null,
},
}
);
const listPrintersResult = await this.db
.collection("printers")
.find({ hostId: data.hostId }).toArray();
if (updatePrintersResult.modifiedCount > 0) {
logger.info(
`Updated ${updatePrintersResult.modifiedCount} printers for user: ${data.hostId}`
);
for (let i = 0; i < listPrintersResult.length; i++) {
const printer = listPrintersResult[i];
const offlineData = {
remoteAddress: printer.remoteAddress,
hostId: printer.hostId,
online: false,
status: { type: "Offline" },
connectedAt: null,
};
logger.info(
`Sending offline status for: ${printer.remoteAddress}`
);
this.sendStatusToUserSockets(offlineData)
}
} else {
logger.warn(`No printers found for user: ${data.hostId}`);
}
//} catch (error) {
// logger.error('Error handling user offline event:', error);
//}
}
sendStatusToUserSockets(data) {
this.userSockets.forEach(id => {
this.io.to(id).emit("status", data);
});
}
async start(port = 3000) {
await this.connectToMongo();
this.configureMiddleware();
this.setupSocketIO();
this.server.listen(port, () => {
logger.info(`Server is running on port ${port}`);
});
} }
} }
module.exports = { WebSocketServer };