mirror of
https://github.com/namibia/awesome-cheatsheets.git
synced 2024-12-21 01:29:04 +00:00
748 lines
22 KiB
JavaScript
748 lines
22 KiB
JavaScript
/* *******************************************************************************************
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* MOLECULER MICROSERVICES FRAMEWORK - CORE CHEATSHEET
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* http://moleculer.services/0.12/docs/
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*
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* Version: 0.12.x
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* ******************************************************************************************* */
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/* *******************************************************************************************
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* Install Moleculer
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* ******************************************************************************************* */
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```bash
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npm i moleculer
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```
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/* *******************************************************************************************
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* SERVICE BROKER OPTIONS
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* ******************************************************************************************* */
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// All ServiceBroker options with default values
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const broker = new ServiceBroker({
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namespace: "", // Namespace for node segmentation
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nodeID: null, // NodeID. Default value is generated from hostname and PID
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logger: null, // Logger instance.
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logLevel: null, // Log level
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logFormatter: "default", // Log formatter. Options: "default", "simple"
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transporter: null, // Transporter config
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requestTimeout: 0 * 1000, // Timeout of requests
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requestRetry: 0, // Retries for requests
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maxCallLevel: 0, // Maximum calling level.
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heartbeatInterval: 5, // Heartbeat sending interval in seconds
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heartbeatTimeout: 15, // Heartbeat timeout in seconds
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disableBalancer: false, // Disable the built-in Moleculer balancer
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registry: { // Service Registry options
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strategy: "RoundRobin", // Invocation strategy
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strategyOptions: null, // Strategy options
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preferLocal: true // Prefer local invocations
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},
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circuitBreaker: { // Circuit-breaker options
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enabled: false, // Enable circuit-breaker
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maxFailures: 3, // Maximum failures
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halfOpenTime: 10 * 1000, // Half-open time interval
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failureOnTimeout: true, // Failure on timeouts
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failureOnReject: true // Failure on rejects
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},
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transit: { // Transit options
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maxQueueSize: 50 * 1000 // Max items in outgoing queue
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},
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cacher: null, // Cacher config
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serializer: null, // Serializer config
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validation: true, // Enable params validation
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validator: null, // Validator instance
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metrics: false, // Enable metrics
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metricsRate: 1, // Metrics rate
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statistics: false, // Enable statistics
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internalServices: true, // Load internal ($node) services
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hotReload: false, // Hot-reload services
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middlewares: null, // List of middlewares
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replCommands: null, // Custom REPL commands
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ServiceFactory: null, // Custom Service factory class
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ContextFactory: null // Custom Context factory class
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});
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/* *******************************************************************************************
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* SERVICE BROKER METHODS
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* ******************************************************************************************* */
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// Broker properties
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broker.Promise // Pointer to Bluebird Promise lib
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broker.namespace // Namespace from options
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broker.nodeID // Local NodeID
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broker.logger // Logger instance
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broker.cacher // Cacher instance
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broker.serializer // Serializer instance
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broker.validator // Validator instance
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// Broker methods
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broker.start(); // Start broker & all services. Returns a Promise
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broker.stop(); // Stop broker & all services. Returns a Promise
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broker.fatal(message, err, needExit = true); // Fired a fatal error.
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broker.repl(); // Switch broker to REPL mode.
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broker.getLogger(module, service, version); // Create a custom logger instance for modules
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broker.loadServices(folder, fileMask); // Load all services from directory
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broker.loadService(filePath); // Load a service from a file
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broker.createService(schema, schemaMods); // Create a local service from schema
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broker.destroyService(service); // Destroy a local service
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broker.getLocalService(name, version); // Get a local service instance by name
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// Wait for services. Returns a Promise
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await broker.waitForServices(serviceNames, timeout, interval);
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await broker.waitForServices(["posts", "users"], 5000);
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await broker.waitForServices({
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name: "posts", version: 2,
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name: "users", version: 1
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}, 5000);
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broker.use(...middlewares); // Register middlewares
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broker.call(actionName, params, opts); // Call a service
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broker.mcall(def); // Multiple service calls
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broker.emit(eventName, payload, groups); // Emit a balanced event
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broker.broadcast(eventName, payload, groups = null) // Broadcast an event
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broker.broadcastLocal(eventName, payload, groups = null) // Broadcast an event to local services
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broker.sendPing(nodeID); // Ping a remote node
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broker.MOLECULER_VERSION // Version number of Moleculer lib
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broker.PROTOCOL_VERSION // Version number of Moleculer protocol
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/* *******************************************************************************************
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* BROKER SERVICE CALLS
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* ******************************************************************************************* */
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// Call the "users.get" service with params
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broker.call("users.get", { id: 150 }).then(user => console.log(user));
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// Call with async/await
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const user = await broker.call("users.get", { id: 150});
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// Call with calling options
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const user = await broker.call("users.get", { id: 150}, { timeout: 5000, retryCount: 3 });
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// Direct call to a remote node
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const info = await broker.call("$node.services", null, { nodeID: "node-123" });
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// Multiple calls with array def
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const [posts, users] = await broker.mcall([
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{ action: "posts.find", params: { limit: 5, offset: 0 } },
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{ action: "users.find", params: { limit: 5, sort: "username" }, opts: { timeout: 500 } }
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]);
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// Multip calls with object def
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const res = await broker.mcall({
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posts: { action: "posts.find", params: { limit: 5, offset: 0 } },
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users: { action: "users.find", params: { limit: 5, sort: "username" }, opts: { timeout: 500 } }
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});
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console.log(res.posts, res.users);
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/* *******************************************************************************************
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* BROKER EVENTS
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* ******************************************************************************************* */
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// Send a balanced event with payload
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broker.emit("user.created", { user: user });
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// Send a balanced event only for "mail" and "payment" service (only one instance)
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broker.emit("user.created", { user: user }, ["mail", "payment"]);
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// Send a broadcast event (for all service instances)
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broker.broadcast("user.created", { user: user });
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// Send a broadcast event only for "mail" and "payment" services (all instances)
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broker.broadcast("user.created", { user: user }, ["mail", "payment"]);
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/* *******************************************************************************************
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* NATS TRANSPORTER
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* Requirement: `npm i nats`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "NATS"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "nats://localhost:4222"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "NATS",
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options: {
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url: "nats://localhost:4222",
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user: "admin",
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pass: "1234"
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}
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}
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});
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// With TLS (https://github.com/nats-io/node-nats#tls)
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const broker = new ServiceBroker({
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transporter: {
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type: "NATS",
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options: {
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url: "nats://localhost:4222",
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tls: {
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key: fs.readFileSync('./client-key.pem'),
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cert: fs.readFileSync('./client-cert.pem'),
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ca: [ fs.readFileSync('./ca.pem') ]
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}
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}
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}
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});
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/* *******************************************************************************************
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* REDIS TRANSPORTER
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* Requirement: `npm i ioredis`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "Redis"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "redis://redis-server:6379"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "Redis",
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options: {
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port: 6379, // Redis port
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host: 'redis-server', // Redis host
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family: 4, // 4 (IPv4) or 6 (IPv6)
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password: 'auth', // Password
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db: 0 // Database index
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}
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}
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});
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/* *******************************************************************************************
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* MQTT TRANSPORTER
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* Requirement: `npm i mqtt`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "MQTT"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "mqtt://mqtt-server:1883"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "MQTT",
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options: {
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host: "mqtt-server",
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port: 1883,
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username: "admin",
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password: "1234"
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}
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}
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});
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/* *******************************************************************************************
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* AMQP TRANSPORTER
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* Requirement: `npm i amqplib`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "AMQP"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "amqp://rabbitmq-server:5672"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "AMQP",
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options: {
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url: "amqp://user:pass@rabbitmq-server:5672",
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eventTimeToLive: 5000,
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prefetch: 1
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}
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}
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});
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/* *******************************************************************************************
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* KAFKA TRANSPORTER
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* Requirement: `npm i kafka-node`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "Kafka"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "kafka://192.168.51.29:2181"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "kafka",
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options: {
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host: "192.168.51.29:2181",
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// KafkaClient options. More info: https://github.com/SOHU-Co/kafka-node#clientconnectionstring-clientid-zkoptions-noackbatchoptions-ssloptions
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client: {
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zkOptions: undefined,
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noAckBatchOptions: undefined,
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sslOptions: undefined
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},
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// KafkaProducer options. More info: https://github.com/SOHU-Co/kafka-node#producerclient-options-custompartitioner
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producer: {},
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customPartitioner: undefined,
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// ConsumerGroup options. More info: https://github.com/SOHU-Co/kafka-node#consumergroupoptions-topics
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consumer: {
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},
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// Advanced options for `send`. More info: https://github.com/SOHU-Co/kafka-node#sendpayloads-cb
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publish: {
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partition: 0,
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attributes: 0
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}
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}
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}
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});
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/* *******************************************************************************************
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* NATS STREAMING TRANSPORTER
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* Requirement: `npm i node-nats-streaming`
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "STAN"
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});
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// With URI
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const broker = new ServiceBroker({
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transporter: "stan://192.168.0.120:4222"
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});
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// With options
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const broker = new ServiceBroker({
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transporter: {
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type: "STAN",
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options: {
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url: "stan://127.0.0.1:4222",
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clusterID: "my-cluster"
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}
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}
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});
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/* *******************************************************************************************
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* TCP STREAMING TRANSPORTER
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* No requirements
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* ******************************************************************************************* */
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// Default options
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const broker = new ServiceBroker({
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transporter: "TCP"
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});
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// With static node list
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const broker = new ServiceBroker({
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transporter: "tcp://172.17.0.1:6000/node-1,172.17.0.2:6000/node-2"
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});
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const broker = new ServiceBroker({
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nodeID: "node-1",
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transporter: {
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type: "TCP",
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options: {
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udpDiscovery: false,
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urls: [
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"172.17.0.1:6000/node-1",
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"172.17.0.2:6000/node-2",
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"172.17.0.3:6000/node-3"
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]
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}
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}
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});
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// With full options
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const broker = new ServiceBroker({
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logger: true,
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transporter: {
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type: "TCP",
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options: {
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// Enable UDP discovery
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udpDiscovery: true,
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// Reusing UDP server socket
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udpReuseAddr: true,
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// UDP port
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udpPort: 4445,
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// UDP bind address
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udpBindAddress: null,
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// UDP sending period
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udpPeriod: 5,
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// Multicast address.
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udpMulticast: "239.0.0.0",
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// Multicast TTL setting
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udpMulticastTTL: 1,
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// Send broadcast
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udpBroadcast: false,
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// TCP server port. Null or 0 means random port
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port: null,
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// Static remote nodes address list (when UDP discovery is not available)
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urls: null,
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// Use hostname as preffered connection address
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useHostname: true,
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// Gossip sending period in seconds
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gossipPeriod: 2,
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// Maximum enabled outgoing connections. If reach, close the old connections
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maxConnections: 32,
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// Maximum TCP packet size
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maxPacketSize: 1 * 1024 * 1024
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}
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}
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});
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/* *******************************************************************************************
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* CACHERS
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* http://moleculer.services/docs/cachers.html
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* ******************************************************************************************* */
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// Memory cacher
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const broker = new ServiceBroker({
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cacher: "Memory"
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});
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// or
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const broker = new ServiceBroker({
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cacher: true
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});
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// Memory cacher with options
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const broker = new ServiceBroker({
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cacher: {
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type: "Memory",
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options: {
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ttl: 30
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}
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}
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});
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// Redis cacher
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const broker = new ServiceBroker({
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cacher: "Redis"
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});
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// Redis cacher with URI
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const broker = new ServiceBroker({
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cacher: "redis://redis-server:6379"
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});
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// Redis cacher with options
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const broker = new ServiceBroker({
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cacher: {
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type: "Redis",
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options: {
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prefix: "MOL",
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redis: {
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host: "redis",
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port: 6379,
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password: "1234",
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db: 0
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}
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}
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}
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||
});
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||
|
||
|
||
/* *******************************************************************************************
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||
* Manual caching
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* ******************************************************************************************* */
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// Save to cache
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broker.cacher.set("mykey.a", { a: 5 });
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// Get from cache
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const obj = await broker.cacher.get("mykey.a");
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// Remove entry from cache
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broker.cacher.del("mykey.a");
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// Clean all 'mykey' entries
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broker.cacher.clean("mykey.*");
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// Clean all entries
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broker.cacher.clean();
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|
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/* *******************************************************************************************
|
||
* SERIALIZER
|
||
* http://moleculer.services/docs/serializers.html
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* ******************************************************************************************* */
|
||
|
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|
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// JSON serializer (default)
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const broker = new ServiceBroker({
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serializer: "JSON"
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});
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||
|
||
// Avro serializer (need `npm i avsc`)
|
||
const broker = new ServiceBroker({
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serializer: "Avro"
|
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});
|
||
|
||
// Protocol Buffer serializer (need `npm i protobufjs`)
|
||
const broker = new ServiceBroker({
|
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serializer: "ProtoBuf"
|
||
});
|
||
|
||
// MsgPack serializer (need `npm i msgpack5`)
|
||
const broker = new ServiceBroker({
|
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serializer: "MsgPack"
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* STRATEGY
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Round-robin strategy (default)
|
||
const broker = new ServiceBroker({
|
||
registry: {
|
||
strategy: "RoundRobin"
|
||
}
|
||
});
|
||
|
||
// Random strategy
|
||
const broker = new ServiceBroker({
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||
registry: {
|
||
strategy: "Random"
|
||
}
|
||
});
|
||
|
||
// CPU usage-based strategy
|
||
const broker = new ServiceBroker({
|
||
registry: {
|
||
strategy: "CpuUsageStrategy"
|
||
}
|
||
});
|
||
|
||
// CPU usage-based strategy with options
|
||
const broker = new ServiceBroker({
|
||
registry: {
|
||
strategy: "CpuUsageStrategy",
|
||
strategyOptions: {
|
||
sampleCount: 3,
|
||
lowCpuUsage: 10
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* LOGGER
|
||
* http://moleculer.services/docs/logger.html
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Logger methods
|
||
broker.logger.fatal();
|
||
broker.logger.error();
|
||
broker.logger.warn();
|
||
broker.logger.info();
|
||
broker.logger.debug();
|
||
broker.logger.trace();
|
||
|
||
// Custom log formatter
|
||
const broker = new ServiceBroker({
|
||
logger: console,
|
||
logFormatter(level, args, bindings) {
|
||
return level.toUpperCase() + " " + bindings.nodeID + ": " + args.join(" ");
|
||
}
|
||
});
|
||
|
||
// External Pino logger
|
||
const pino = require("pino")({ level: "info" });
|
||
const broker = new ServiceBroker({
|
||
logger: bindings => pino.child(bindings)
|
||
});
|
||
|
||
// External Bunyan logger
|
||
const logger = require("bunyan").createLogger({ name: "moleculer", level: "info" });
|
||
const broker = new ServiceBroker({
|
||
logger: bindings => logger.child(bindings)
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* SERVICE SCHEMA
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
module.exports = {
|
||
// Name
|
||
name: "greeter",
|
||
// Version
|
||
version: 2,
|
||
|
||
// Settings
|
||
settings: {},
|
||
// Metadata
|
||
metadata: {},
|
||
// Dependencies
|
||
dependencies: [],
|
||
|
||
// Actions
|
||
actions: {
|
||
// Shorthand actions
|
||
hello() {
|
||
// Call a method
|
||
this.doSomething();
|
||
|
||
return "Hello Moleculer";
|
||
},
|
||
|
||
// With properties
|
||
welcome: {
|
||
// Cache options
|
||
cache: {
|
||
keys: ["name"]
|
||
},
|
||
// Validation options
|
||
params: {
|
||
name: "string"
|
||
},
|
||
// Action handler
|
||
handler(ctx) {
|
||
return `Welcome, ${ctx.params.name}`;
|
||
}
|
||
}
|
||
},
|
||
|
||
events: {
|
||
"user.created"(payload, sender) {
|
||
|
||
}
|
||
},
|
||
|
||
// Service methods
|
||
methods: {
|
||
doSomething() {}
|
||
},
|
||
|
||
// Lifecycle event handlers
|
||
created() {
|
||
console.log("Service created");
|
||
},
|
||
|
||
started() {
|
||
console.log("Service started");
|
||
return Promise.resolve();
|
||
},
|
||
|
||
stopped() {
|
||
console.log("Service stopped");
|
||
return Promise.resolve();
|
||
}
|
||
};
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* SERVICE
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
this.name // Name of service
|
||
this.version // Version of service
|
||
this.settings // Settings of service
|
||
this.schema // Schema definition of service
|
||
this.broker // Broker instance
|
||
this.Promise // Class of Promise (Bluebird)
|
||
this.logger // Logger instance
|
||
this.actions // Actions of service.
|
||
this.waitForServices // Pointer to ‘broker.waitForServices’ method
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* CONTEXT
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
ctx.id // Context ID
|
||
ctx.broker // Broker instance
|
||
ctx.action // Action definition
|
||
ctx.nodeID // Node ID
|
||
ctx.requestID // Request ID
|
||
ctx.parentID // ID of parent context (in case of sub-calls).
|
||
ctx.params // Request params
|
||
ctx.meta // Request metadata
|
||
ctx.callerNodeID // Caller Node ID if it is requested from a remote node.
|
||
ctx.level // Request level (in case of sub-calls). The first level is 1.
|
||
|
||
// Make a sub-call
|
||
ctx.call(actionName, params, callingOptions)
|
||
|
||
// Emit an event
|
||
ctx.emit(eventName, payload, groups);
|