mirror of
https://github.com/namibia/awesome-cheatsheets.git
synced 2024-11-08 06:15:23 +00:00
748 lines
22 KiB
JavaScript
748 lines
22 KiB
JavaScript
/* *******************************************************************************************
|
||
* MOLECULER MICROSERVICES FRAMEWORK - CORE CHEATSHEET
|
||
* http://moleculer.services/0.12/docs/
|
||
*
|
||
* Version: 0.12.x
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* Install Moleculer
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
```bash
|
||
npm i moleculer
|
||
```
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* SERVICE BROKER OPTIONS
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// All ServiceBroker options with default values
|
||
const broker = new ServiceBroker({
|
||
namespace: "", // Namespace for node segmentation
|
||
nodeID: null, // NodeID. Default value is generated from hostname and PID
|
||
|
||
logger: null, // Logger instance.
|
||
logLevel: null, // Log level
|
||
logFormatter: "default", // Log formatter. Options: "default", "simple"
|
||
|
||
transporter: null, // Transporter config
|
||
requestTimeout: 0 * 1000, // Timeout of requests
|
||
requestRetry: 0, // Retries for requests
|
||
maxCallLevel: 0, // Maximum calling level.
|
||
heartbeatInterval: 5, // Heartbeat sending interval in seconds
|
||
heartbeatTimeout: 15, // Heartbeat timeout in seconds
|
||
|
||
disableBalancer: false, // Disable the built-in Moleculer balancer
|
||
|
||
registry: { // Service Registry options
|
||
strategy: "RoundRobin", // Invocation strategy
|
||
strategyOptions: null, // Strategy options
|
||
preferLocal: true // Prefer local invocations
|
||
},
|
||
|
||
circuitBreaker: { // Circuit-breaker options
|
||
enabled: false, // Enable circuit-breaker
|
||
maxFailures: 3, // Maximum failures
|
||
halfOpenTime: 10 * 1000, // Half-open time interval
|
||
failureOnTimeout: true, // Failure on timeouts
|
||
failureOnReject: true // Failure on rejects
|
||
},
|
||
|
||
transit: { // Transit options
|
||
maxQueueSize: 50 * 1000 // Max items in outgoing queue
|
||
},
|
||
|
||
cacher: null, // Cacher config
|
||
serializer: null, // Serializer config
|
||
|
||
validation: true, // Enable params validation
|
||
validator: null, // Validator instance
|
||
metrics: false, // Enable metrics
|
||
metricsRate: 1, // Metrics rate
|
||
statistics: false, // Enable statistics
|
||
internalServices: true, // Load internal ($node) services
|
||
|
||
hotReload: false, // Hot-reload services
|
||
|
||
middlewares: null, // List of middlewares
|
||
|
||
replCommands: null, // Custom REPL commands
|
||
|
||
ServiceFactory: null, // Custom Service factory class
|
||
ContextFactory: null // Custom Context factory class
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* SERVICE BROKER METHODS
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Broker properties
|
||
broker.Promise // Pointer to Bluebird Promise lib
|
||
broker.namespace // Namespace from options
|
||
broker.nodeID // Local NodeID
|
||
broker.logger // Logger instance
|
||
broker.cacher // Cacher instance
|
||
broker.serializer // Serializer instance
|
||
broker.validator // Validator instance
|
||
|
||
// Broker methods
|
||
broker.start(); // Start broker & all services. Returns a Promise
|
||
broker.stop(); // Stop broker & all services. Returns a Promise
|
||
broker.fatal(message, err, needExit = true); // Fired a fatal error.
|
||
broker.repl(); // Switch broker to REPL mode.
|
||
|
||
broker.getLogger(module, service, version); // Create a custom logger instance for modules
|
||
|
||
broker.loadServices(folder, fileMask); // Load all services from directory
|
||
broker.loadService(filePath); // Load a service from a file
|
||
broker.createService(schema, schemaMods); // Create a local service from schema
|
||
broker.destroyService(service); // Destroy a local service
|
||
broker.getLocalService(name, version); // Get a local service instance by name
|
||
|
||
// Wait for services. Returns a Promise
|
||
await broker.waitForServices(serviceNames, timeout, interval);
|
||
await broker.waitForServices(["posts", "users"], 5000);
|
||
await broker.waitForServices({
|
||
name: "posts", version: 2,
|
||
name: "users", version: 1
|
||
}, 5000);
|
||
|
||
broker.use(...middlewares); // Register middlewares
|
||
|
||
broker.call(actionName, params, opts); // Call a service
|
||
broker.mcall(def); // Multiple service calls
|
||
|
||
broker.emit(eventName, payload, groups); // Emit a balanced event
|
||
broker.broadcast(eventName, payload, groups = null) // Broadcast an event
|
||
broker.broadcastLocal(eventName, payload, groups = null) // Broadcast an event to local services
|
||
|
||
broker.sendPing(nodeID); // Ping a remote node
|
||
broker.MOLECULER_VERSION // Version number of Moleculer lib
|
||
broker.PROTOCOL_VERSION // Version number of Moleculer protocol
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* BROKER SERVICE CALLS
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Call the "users.get" service with params
|
||
broker.call("users.get", { id: 150 }).then(user => console.log(user));
|
||
|
||
// Call with async/await
|
||
const user = await broker.call("users.get", { id: 150});
|
||
|
||
// Call with calling options
|
||
const user = await broker.call("users.get", { id: 150}, { timeout: 5000, retryCount: 3 });
|
||
|
||
// Direct call to a remote node
|
||
const info = await broker.call("$node.services", null, { nodeID: "node-123" });
|
||
|
||
// Multiple calls with array def
|
||
const [posts, users] = await broker.mcall([
|
||
{ action: "posts.find", params: { limit: 5, offset: 0 } },
|
||
{ action: "users.find", params: { limit: 5, sort: "username" }, opts: { timeout: 500 } }
|
||
]);
|
||
|
||
// Multip calls with object def
|
||
const res = await broker.mcall({
|
||
posts: { action: "posts.find", params: { limit: 5, offset: 0 } },
|
||
users: { action: "users.find", params: { limit: 5, sort: "username" }, opts: { timeout: 500 } }
|
||
});
|
||
console.log(res.posts, res.users);
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* BROKER EVENTS
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Send a balanced event with payload
|
||
broker.emit("user.created", { user: user });
|
||
|
||
// Send a balanced event only for "mail" and "payment" service (only one instance)
|
||
broker.emit("user.created", { user: user }, ["mail", "payment"]);
|
||
|
||
// Send a broadcast event (for all service instances)
|
||
broker.broadcast("user.created", { user: user });
|
||
|
||
// Send a broadcast event only for "mail" and "payment" services (all instances)
|
||
broker.broadcast("user.created", { user: user }, ["mail", "payment"]);
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* NATS TRANSPORTER
|
||
* Requirement: `npm i nats`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "NATS"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "nats://localhost:4222"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "NATS",
|
||
options: {
|
||
url: "nats://localhost:4222",
|
||
user: "admin",
|
||
pass: "1234"
|
||
}
|
||
}
|
||
});
|
||
|
||
// With TLS (https://github.com/nats-io/node-nats#tls)
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "NATS",
|
||
options: {
|
||
url: "nats://localhost:4222",
|
||
tls: {
|
||
key: fs.readFileSync('./client-key.pem'),
|
||
cert: fs.readFileSync('./client-cert.pem'),
|
||
ca: [ fs.readFileSync('./ca.pem') ]
|
||
}
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* REDIS TRANSPORTER
|
||
* Requirement: `npm i ioredis`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "Redis"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "redis://redis-server:6379"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "Redis",
|
||
options: {
|
||
port: 6379, // Redis port
|
||
host: 'redis-server', // Redis host
|
||
family: 4, // 4 (IPv4) or 6 (IPv6)
|
||
password: 'auth', // Password
|
||
db: 0 // Database index
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* MQTT TRANSPORTER
|
||
* Requirement: `npm i mqtt`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "MQTT"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "mqtt://mqtt-server:1883"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "MQTT",
|
||
options: {
|
||
host: "mqtt-server",
|
||
port: 1883,
|
||
username: "admin",
|
||
password: "1234"
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* AMQP TRANSPORTER
|
||
* Requirement: `npm i amqplib`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "AMQP"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "amqp://rabbitmq-server:5672"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "AMQP",
|
||
options: {
|
||
url: "amqp://user:pass@rabbitmq-server:5672",
|
||
eventTimeToLive: 5000,
|
||
prefetch: 1
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* KAFKA TRANSPORTER
|
||
* Requirement: `npm i kafka-node`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "Kafka"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "kafka://192.168.51.29:2181"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "kafka",
|
||
options: {
|
||
host: "192.168.51.29:2181",
|
||
|
||
// KafkaClient options. More info: https://github.com/SOHU-Co/kafka-node#clientconnectionstring-clientid-zkoptions-noackbatchoptions-ssloptions
|
||
client: {
|
||
zkOptions: undefined,
|
||
noAckBatchOptions: undefined,
|
||
sslOptions: undefined
|
||
},
|
||
|
||
// KafkaProducer options. More info: https://github.com/SOHU-Co/kafka-node#producerclient-options-custompartitioner
|
||
producer: {},
|
||
customPartitioner: undefined,
|
||
|
||
// ConsumerGroup options. More info: https://github.com/SOHU-Co/kafka-node#consumergroupoptions-topics
|
||
consumer: {
|
||
},
|
||
|
||
// Advanced options for `send`. More info: https://github.com/SOHU-Co/kafka-node#sendpayloads-cb
|
||
publish: {
|
||
partition: 0,
|
||
attributes: 0
|
||
}
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* NATS STREAMING TRANSPORTER
|
||
* Requirement: `npm i node-nats-streaming`
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "STAN"
|
||
});
|
||
|
||
// With URI
|
||
const broker = new ServiceBroker({
|
||
transporter: "stan://192.168.0.120:4222"
|
||
});
|
||
|
||
// With options
|
||
const broker = new ServiceBroker({
|
||
transporter: {
|
||
type: "STAN",
|
||
options: {
|
||
url: "stan://127.0.0.1:4222",
|
||
clusterID: "my-cluster"
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* TCP STREAMING TRANSPORTER
|
||
* No requirements
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Default options
|
||
const broker = new ServiceBroker({
|
||
transporter: "TCP"
|
||
});
|
||
|
||
// With static node list
|
||
const broker = new ServiceBroker({
|
||
transporter: "tcp://172.17.0.1:6000/node-1,172.17.0.2:6000/node-2"
|
||
});
|
||
|
||
const broker = new ServiceBroker({
|
||
nodeID: "node-1",
|
||
transporter: {
|
||
type: "TCP",
|
||
options: {
|
||
udpDiscovery: false,
|
||
urls: [
|
||
"172.17.0.1:6000/node-1",
|
||
"172.17.0.2:6000/node-2",
|
||
"172.17.0.3:6000/node-3"
|
||
]
|
||
}
|
||
}
|
||
});
|
||
|
||
// With full options
|
||
const broker = new ServiceBroker({
|
||
logger: true,
|
||
transporter: {
|
||
type: "TCP",
|
||
options: {
|
||
// Enable UDP discovery
|
||
udpDiscovery: true,
|
||
// Reusing UDP server socket
|
||
udpReuseAddr: true,
|
||
|
||
// UDP port
|
||
udpPort: 4445,
|
||
// UDP bind address
|
||
udpBindAddress: null,
|
||
// UDP sending period
|
||
udpPeriod: 5,
|
||
|
||
// Multicast address.
|
||
udpMulticast: "239.0.0.0",
|
||
// Multicast TTL setting
|
||
udpMulticastTTL: 1,
|
||
|
||
// Send broadcast
|
||
udpBroadcast: false,
|
||
|
||
// TCP server port. Null or 0 means random port
|
||
port: null,
|
||
// Static remote nodes address list (when UDP discovery is not available)
|
||
urls: null,
|
||
// Use hostname as preffered connection address
|
||
useHostname: true,
|
||
|
||
// Gossip sending period in seconds
|
||
gossipPeriod: 2,
|
||
// Maximum enabled outgoing connections. If reach, close the old connections
|
||
maxConnections: 32,
|
||
// Maximum TCP packet size
|
||
maxPacketSize: 1 * 1024 * 1024
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* CACHERS
|
||
* http://moleculer.services/docs/cachers.html
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Memory cacher
|
||
const broker = new ServiceBroker({
|
||
cacher: "Memory"
|
||
});
|
||
// or
|
||
const broker = new ServiceBroker({
|
||
cacher: true
|
||
});
|
||
|
||
// Memory cacher with options
|
||
const broker = new ServiceBroker({
|
||
cacher: {
|
||
type: "Memory",
|
||
options: {
|
||
ttl: 30
|
||
}
|
||
}
|
||
});
|
||
|
||
// Redis cacher
|
||
const broker = new ServiceBroker({
|
||
cacher: "Redis"
|
||
});
|
||
|
||
// Redis cacher with URI
|
||
const broker = new ServiceBroker({
|
||
cacher: "redis://redis-server:6379"
|
||
});
|
||
|
||
// Redis cacher with options
|
||
const broker = new ServiceBroker({
|
||
cacher: {
|
||
type: "Redis",
|
||
options: {
|
||
prefix: "MOL",
|
||
redis: {
|
||
host: "redis",
|
||
port: 6379,
|
||
password: "1234",
|
||
db: 0
|
||
}
|
||
}
|
||
}
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* Manual caching
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Save to cache
|
||
broker.cacher.set("mykey.a", { a: 5 });
|
||
|
||
// Get from cache
|
||
const obj = await broker.cacher.get("mykey.a");
|
||
|
||
// Remove entry from cache
|
||
broker.cacher.del("mykey.a");
|
||
|
||
// Clean all 'mykey' entries
|
||
broker.cacher.clean("mykey.*");
|
||
|
||
// Clean all entries
|
||
broker.cacher.clean();
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* SERIALIZER
|
||
* http://moleculer.services/docs/serializers.html
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// JSON serializer (default)
|
||
const broker = new ServiceBroker({
|
||
serializer: "JSON"
|
||
});
|
||
|
||
// Avro serializer (need `npm i avsc`)
|
||
const broker = new ServiceBroker({
|
||
serializer: "Avro"
|
||
});
|
||
|
||
// Protocol Buffer serializer (need `npm i protobufjs`)
|
||
const broker = new ServiceBroker({
|
||
serializer: "ProtoBuf"
|
||
});
|
||
|
||
// MsgPack serializer (need `npm i msgpack5`)
|
||
const broker = new ServiceBroker({
|
||
serializer: "MsgPack"
|
||
});
|
||
|
||
|
||
/* *******************************************************************************************
|
||
* STRATEGY
|
||
* ******************************************************************************************* */
|
||
|
||
|
||
// Round-robin strategy (default)
|
||
const broker = new ServiceBroker({
|
||
registry: {
|
||
strategy: "RoundRobin"
|
||
}
|
||
});
|
||
|
||
// Random strategy
|
||
const broker = new ServiceBroker({
|
||
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);
|