moleculer.config.js

"use strict";

const HealthCheckMiddleware = require("./middlewares/healthcheck.middleware");

/**
 * Moleculer ServiceBroker configuration file
 * 
 * More info about options: 
 *     https://moleculer.services/docs/0.14/configuration.html
 * 
 * 
 * Overwriting options in production:
 * ================================ 
 * 	You can overwrite any option with environment variables. 
 * 	For example to overwrite the "logLevel" value, 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", 
 * 	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`.
 *  It will set this:
 *  {
 *    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,
	// Custom metadata store. Store here what you want. Accessing: `this.broker.metadata`
	metadata: {},

	// Enable/disable logging or use custom logger. More info: https://moleculer.services/docs/0.14/logging.html
	logger: {
		// Availabel logger types: "Console", "File", "Pino", "Winston", "Bunyan", "debug", "Log4js", "Datadog"
		type: "Console",
		options: {
			// Using colors on the output
			colors: true,
			// Print module names with different colors (like docker-compose for containers)
			moduleColors: false,
			// Line formatter. It can be "json", "short", "simple", "full", a `Function` or a template string like "{timestamp} {level} {nodeID}/{mod}: {msg}"
			formatter: "full",
			// Custom object printer. If not defined, it uses the `util.inspect` method.
			objectPrinter: null,
			// Auto-padding the module name in order to messages begin at the same column.
			autoPadding: false			
		}
	},
	// Default log level for built-in console logger. It can be overwritten in logger options above.
	// Available values: trace, debug, info, warn, error, fatal
	logLevel: "info",

	// Define transporter. 
	// More info: https://moleculer.services/docs/0.14/networking.html
	transporter: "NATS",
	
	// Define a cacher. 
	// More info: https://moleculer.services/docs/0.14/caching.html
	cacher: null,

	// Define a serializer. 
	// Available values: "JSON", "Avro", "ProtoBuf", "MsgPack", "Notepack", "Thrift". 
	// More info: https://moleculer.services/docs/0.14/networking.html#Serialization
	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/0.14/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
	},

	// 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: 10,
	// Number of seconds to wait before setting node to unavailable status.
	heartbeatTimeout: 30,

	// Cloning the params of context if enabled. High performance impact, use it with caution!
	contextParamsCloning: false,

	// Tracking requests and waiting for running requests before shutdowning. More info: https://moleculer.services/docs/0.14/context.html#Context-tracking
	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.). More info: https://moleculer.services/docs/0.14/networking.html#Disabled-balancer
	disableBalancer: false,

	// Settings of Service Registry. More info: https://moleculer.services/docs/0.14/registry.html
	registry: {
		// Define balancing strategy. More info: https://moleculer.services/docs/0.14/balancing.html
		// Available values: "RoundRobin", "Random", "CpuUsage", "Latency", "Shard"
		strategy: "RoundRobin",
		// Enable local action call preferring. Always call the local action instance if available.
		preferLocal: true
	},

	// Settings of Circuit Breaker. More info: https://moleculer.services/docs/0.14/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/0.14/fault-tolerance.html#Bulkhead
	bulkhead: {
		// Enable feature.
		enabled: false,
		// Maximum concurrent executions.
		concurrency: 10,
		// Maximum size of queue
		maxQueueSize: 100,
	},

	// Enable action & event parameter validation. More info: https://moleculer.services/docs/0.14/validating.html
	validator: true,

	errorHandler: null,

	// Enable/disable built-in metrics function. More info: https://moleculer.services/docs/0.14/metrics.html
	metrics: {
		enabled: true,
		reporter: {
			// Available built-in reporters: "Console", "CSV", "Event", "Prometheus", "Datadog", "StatsD"
			type: "Prometheus",
			options: {
				// HTTP port
				port: 3030,
				// HTTP URL path
				path: "/metrics",
				// Default labels which are appended to all metrics labels
				defaultLabels: registry => ({
					namespace: registry.broker.namespace,
					nodeID: registry.broker.nodeID
				})
			}
		}
	},

	// Enable built-in tracing function. More info: https://moleculer.services/docs/0.14/tracing.html
	tracing: {
		enabled: true,
		exporter: {
			// Available built-in exporters: "Console", "Datadog", "Event", "EventLegacy", "Jaeger", "Zipkin"
			type: "Console", // Console exporter is only for development!
			options: {
				// Custom logger
				logger: null,
				// Using colors
				colors: true,
				// Width of row
				width: 100,
				// Gauge width in the row
				gaugeWidth: 40
			}
		}
	},

	// Register custom middlewares
	middlewares: [
		HealthCheckMiddleware()
	],

	// Register custom REPL commands.
	replCommands: null,

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

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

	},

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

	}
};