moleculer.config.js

"use strict";

/**
 * Moleculer ServiceBroker configuration file
 * 
 * More info about options: https://moleculer.services/docs/0.13/broker.html#Broker-options
 * 
 * Overwrite options in production:
 * ================================ 
 * 	You can overwrite any option with environment variables. 
 * 	For example to overwrite the "logLevel", use `LOGLEVEL=warn` env var.
 * 	To overwrite a nested parameter, e.g. retryPolicy.retries, use `RETRYPOLICY_RETRIES=10` env var.
 *  
 * 	To overwrite broker’s deeply nested default options, which are not presented in "moleculer.config.js", 
 * 	via environment variables, use the `MOL_` prefix and double underscore `__` for nested properties in .env file. 
 * 	For example, to set the cacher prefix to `MYCACHE`, you should declare an env var as `MOL_CACHER__OPTIONS__PREFIX=MYCACHE`.
 */
module.exports = {
	// Namespace of nodes to segment your nodes on the same network.
	namespace: "",
	// Unique node identifier. Must be unique in a namespace.
	nodeID: null,

	// Enable/disable logging or use custom logger. More info: https://moleculer.services/docs/0.13/logging.html
	logger: true,
	// Log level for built-in console logger. Available values: trace, debug, info, warn, error, fatal
	logLevel: "info",
	// Log formatter for built-in console logger. Available values: default, simple, short. It can be also a `Function`.
	logFormatter: "default",
	// Custom object & array printer for built-in console logger.
	logObjectPrinter: null,

	// Define a serializer. 
	// Available values: "JSON", "Avro", "ProtoBuf", "MsgPack", "Notepack", "Thrift". 
	// More info: https://moleculer.services/docs/0.13/networking.html
	serializer: "JSON",

	// Number of milliseconds to wait before reject a request with a RequestTimeout error. Disabled: 0
	requestTimeout: 10 * 1000,

	// Retry policy settings. More info: https://moleculer.services/docs/0.13/fault-tolerance.html#Retry
	retryPolicy: {
		// Enable feature
		enabled: false,
		// Count of retries
		retries: 5,
		// First delay in milliseconds.
		delay: 100,
		// Maximum delay in milliseconds.
		maxDelay: 1000,
		// Backoff factor for delay. 2 means exponential backoff.
		factor: 2,
		// A function to check failed requests.
		check: err => err && !!err.retryable
	},
	tracing: {
		enabled: true,
		stackTrace: true,
		sampling: {
			rate: 1.0
		},
		exporter: [{
			type: "Console"
		}]
	},
	// Limit of calling level. If it reaches the limit, broker will throw an MaxCallLevelError error. (Infinite loop protection)
	maxCallLevel: 100,

	// Number of seconds to send heartbeat packet to other nodes.
	heartbeatInterval: 5,
	// Number of seconds to wait before setting node to unavailable status.
	heartbeatTimeout: 15,

	// Tracking requests and waiting for running requests before shutdowning. More info: https://moleculer.services/docs/0.13/fault-tolerance.html
	tracking: {
		// Enable feature
		enabled: false,
		// Number of milliseconds to wait before shutdowning the process
		shutdownTimeout: 5000,
	},

	// Disable built-in request & emit balancer. (Transporter must support it, as well.)
	disableBalancer: false,

	// Settings of Service Registry. More info: https://moleculer.services/docs/0.13/registry.html
	registry: {
		// Define balancing strategy. 
		// Available values: "RoundRobin", "Random", "CpuUsage", "Latency"
		strategy: "RoundRobin",
		// Enable local action call preferring.
		preferLocal: true
	},

	// Settings of Circuit Breaker. More info: https://moleculer.services/docs/0.13/fault-tolerance.html#Circuit-Breaker
	circuitBreaker: {
		// Enable feature
		enabled: false,
		// Threshold value. 0.5 means that 50% should be failed for tripping.
		threshold: 0.5,
		// Minimum request count. Below it, CB does not trip.
		minRequestCount: 20,
		// Number of seconds for time window.
		windowTime: 60,
		// Number of milliseconds to switch from open to half-open state
		halfOpenTime: 10 * 1000,
		// A function to check failed requests.
		check: err => err && err.code >= 500
	},

	// Settings of bulkhead feature. More info: https://moleculer.services/docs/0.13/fault-tolerance.html#Bulkhead
	bulkhead: {
		// Enable feature.
		enabled: false,
		// Maximum concurrent executions.
		concurrency: 10,
		// Maximum size of queue
		maxQueueSize: 100,
	},

	// Enable parameters validation. More info: https://moleculer.services/docs/0.13/validating.html
	validation: true,
	// Custom Validator class for validation.
	validator: null,

	// Enable metrics function. More info: https://moleculer.services/docs/0.13/metrics.html
	metrics: false,
	// Rate of metrics calls. 1 means to measure every request, 0 means to measure nothing.
	metricsRate: 1,

	// Register internal services ("$node"). More info: https://moleculer.services/docs/0.13/services.html#Internal-services
	internalServices: true,
	// Register internal middlewares. More info: https://moleculer.services/docs/0.13/middlewares.html#Internal-middlewares
	internalMiddlewares: true,

	// Watch the loaded services and hot reload if they changed. You can also enable it in Moleculer Runner with `--hot` argument
	hotReload: false,

	// Register custom middlewares
	middlewares: [],

	// Called after broker created.
	created(broker) {
		
	},

	// Called after broker starte.
	started(broker) {

	},

	// Called after broker stopped.
	stopped(broker) {

	},

	// Register custom REPL commands.
	replCommands: null
};