automatic reconnect to database
This commit is contained in:
Wolfgang Hottgenroth
parent
724f60354c
commit
19ea878a59
220
src/main.ts
220
src/main.ts
@ -1,5 +1,6 @@
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import * as Mqtt from 'mqtt'
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import * as Mongo from 'mongodb'
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import * as Events from 'events'
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import * as Queue from './queue'
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import * as MqttMessage from './mqtt_message'
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@ -22,112 +23,139 @@ options
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.parse(process.argv)
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class MqttMongo extends Events.EventEmitter {
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var dbHandle : Mongo.Db;
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var dbReady : boolean = false;
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private options : any
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Mongo.MongoClient.connect(options['database'],
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{
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'server': {
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'reconnectTries': 5,
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'reconnectInterval': 1000,
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'socketOptions': {
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'autoReconnect': false
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}
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}
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})
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.then(
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(tmpDbHandle: Mongo.Db) => {
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dbHandle = tmpDbHandle
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dbReady = true;
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console.info("Connected to database")
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dbHandle.on('reconnectFailed', (err : any) => { console.warn(`Error on database ${err}`) })
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dbHandle.on('reconnect', () => {
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console.info("Reconnect on database")
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dbReady = true
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queue.knock()
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})
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dbHandle.on('timeout', () => { console.warn("Timeout on database") })
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dbHandle.on('close', () => {
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console.info("Close on database")
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dbReady = false
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})
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},
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(err: String) => {
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console.error("Unable to connect to database: %s", err)
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process.exit(1)
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}
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)
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var queue = new Queue.Queue<MqttMessage.MqttMessage>()
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queue.on('data', () => {
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if (dbReady) {
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while (! queue.isEmpty()) {
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var msg : MqttMessage.MqttMessage = queue.deq()
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console.info(`Something in the queue: ${JSON.stringify(msg)}`)
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var coll = dbHandle.collection(options['collection'])
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coll.insertOne(msg.getMessage())
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.then(
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(r) => {
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console.success(`Successfully inserted into database ${JSON.stringify(msg.getMessage())}`)
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},
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(err) => {
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console.error(`Error when trying to insert into database ${err}`)
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if (! dbReady) {
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console.info("Error occured while database connection is lost, re-enqueue msg.")
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queue.reenq(msg)
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} else {
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console.error(`Message ${JSON.stringify(msg.getMessage())} is lost`)
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}
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}
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)
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}
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} else {
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// console.info("Database currently not available, not reading from stream")
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constructor(options : any) {
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super()
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this.options = options
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this.on('reconnectDatabase', this.connectToDatabase)
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}
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})
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private dbHandle : Mongo.Db;
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private dbReady : boolean = false;
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private queue : Queue.Queue<MqttMessage.MqttMessage> = new Queue.Queue<MqttMessage.MqttMessage>()
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private mqttClient : Mqtt.Client
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private heartbeatTimer : NodeJS.Timer
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private uptime : number = 0
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var mqttClient = Mqtt.connect(options['broker'])
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mqttClient.on('offline', () => { console.warn("MQTT client is offline") })
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mqttClient.on('reconnect', () => { console.warn("MQTT client is reconnecting") })
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mqttClient.on('close', () => { console.warn("MQTT connection closed") })
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connectToDatabase() {
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console.info("About to connect to database")
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Mongo.MongoClient.connect(this.options['database'],
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{
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// 'server': {
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// 'reconnectTries': 5,
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// 'reconnectInterval': 1000,
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// 'socketOptions': {
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// 'autoReconnect': false
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// }
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// }
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})
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.then(
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(tmpDbHandle: Mongo.Db) => {
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this.dbHandle = tmpDbHandle
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this.dbReady = true;
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console.info("Connected to database")
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this.dbHandle.on('reconnectFailed', (err : any) => { console.warn(`Error on database ${err}`) })
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this.dbHandle.on('reconnect', () => {
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console.info("Reconnect on database")
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this.dbReady = true
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this.queue.knock()
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})
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this.dbHandle.on('timeout', () => { console.warn("Timeout on database") })
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this.dbHandle.on('close', () => {
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console.info("Close on database")
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this.dbReady = false
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})
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},
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(err: String) => {
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console.error(`Unable to connect to database: ${err}`)
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this.dbReady = false
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}
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)
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}
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mqttClient.on('connect', () => {
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console.info("Connected to MQTT broker")
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mqttClient.subscribe(options['topic'])
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mqttClient.subscribe('MqttMongo/Command')
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mqttClient.publish('MqttMongo/Status', 'hello, started up')
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})
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connectToBroker() {
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this.queue.on('data', () => {
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if (this.dbReady || true) {
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while (! this.queue.isEmpty()) {
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var msg : MqttMessage.MqttMessage = this.queue.deq()
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console.info(`Something in the queue: ${JSON.stringify(msg)}`)
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var coll = this.dbHandle.collection(options['collection'])
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coll.insertOne(msg.getMessage())
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.then(
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(r) => {
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console.success(`Successfully inserted into database ${JSON.stringify(msg.getMessage())}`)
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},
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(err) => {
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console.error(`Error when trying to insert into database ${err}`)
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if (! this.dbReady) {
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console.info("Error occured while database connection is lost, re-enqueue msg.")
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this.queue.reenq(msg)
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this.emit('reconnectDatabase')
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} else {
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console.error(`Message ${JSON.stringify(msg.getMessage())} is lost`)
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}
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}
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)
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}
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} else {
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// console.info("Database currently not available, not reading from stream")
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}
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})
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this.mqttClient = Mqtt.connect(options['broker'])
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this.mqttClient.on('offline', () => { console.warn("MQTT client is offline") })
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this.mqttClient.on('reconnect', () => { console.warn("MQTT client is reconnecting") })
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this.mqttClient.on('close', () => { console.warn("MQTT connection closed") })
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var msgCnt : number = 0
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mqttClient.on('message', (topic : string, message : string) => {
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msgCnt++;
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console.info(`Message received ${msgCnt}, topic ${topic}, payload ${message}`)
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this.mqttClient.on('connect', () => {
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console.info("Connected to MQTT broker")
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this.mqttClient.subscribe(options['topic'])
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this.mqttClient.subscribe('MqttMongo/Command')
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this.mqttClient.publish('MqttMongo/Status', 'hello, started up')
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})
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if (topic == "MqttMongo/Command" && message == "shutdown") {
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var msgCnt : number = 0
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this.mqttClient.on('message', (topic : string, message : string) => {
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msgCnt++;
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console.info(`Message received ${msgCnt}, topic ${topic}, payload ${message}`)
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if (topic == "MqttMongo/Command" && message == "shutdown") {
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this.shutdown()
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} else {
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try {
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var mqttMessage = new MqttMessage.MqttMessage(topic, message)
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this.queue.enq(mqttMessage)
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} catch (e) {
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console.error(`Error while parsing Mqtt message, topic '${topic}', message '${message}' , ${e.toString()}`)
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}
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}
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})
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}
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setupHeartbeat() {
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this.heartbeatTimer = setInterval(() => {
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this.uptime++
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this.mqttClient.publish('MqttMongo/Status', `{'Uptime': ${this.uptime}}`)
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if (! this.dbReady) {
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this.emit("reconnectDatabase")
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}
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}, 1000)
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}
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shutdown() {
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console.info("Shutting down MqttMongo")
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clearInterval(uptimeInterval)
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mqttClient.end()
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dbHandle.close()
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} else {
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try {
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var mqttMessage = new MqttMessage.MqttMessage(topic, message)
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queue.enq(mqttMessage)
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} catch (e) {
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console.error(`Error while parsing Mqtt message, topic '${topic}', message '${message}' , ${e.toString()}`)
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}
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clearInterval(this.heartbeatTimer)
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this.mqttClient.end()
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this.dbHandle.close()
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}
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})
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var uptime : number = 0
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var uptimeInterval = setInterval(() => {
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uptime++
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mqttClient.publish('MqttMongo/Status', `{'Uptime': ${uptime}}`)
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}, 1000)
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}
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var mqttMongo : MqttMongo = new MqttMongo(options)
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mqttMongo.connectToDatabase()
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mqttMongo.connectToBroker()
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mqttMongo.setupHeartbeat()
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console.info("MqttMongo started")
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