postgres-insert-gridcell/rabbit.go at master · ttnmapper/postgres-insert-gridcell · GitHub

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package main

import (
	"github.com/streadway/amqp"
	"log"
)

var (
	newDataChannel      = make(chan amqp.Delivery)
	gatewayMovedChannel = make(chan amqp.Delivery)
)

func subscribeToRabbitNewData() {
	// Start thread that listens for new amqp messages
	conn, err := amqp.Dial("amqp://" + myConfiguration.AmqpUser + ":" + myConfiguration.AmqpPassword + "@" + myConfiguration.AmqpHost + ":" + myConfiguration.AmqpPort + "/")
	failOnError(err, "Failed to connect to RabbitMQ")
	defer conn.Close()

	// Create a channel for errors
	notify := conn.NotifyClose(make(chan *amqp.Error)) //error channel

	ch, err := conn.Channel()
	failOnError(err, "Failed to open a channel")
	defer ch.Close()

	err = ch.ExchangeDeclare(
		myConfiguration.AmqpExchangeInsertedData, // name
		"fanout",                                 // type
		true,                                     // durable
		false,                                    // auto-deleted
		false,                                    // internal
		false,                                    // no-wait
		nil,                                      // arguments
	)
	failOnError(err, "Failed to declare an exchange")

	q, err := ch.QueueDeclare(
		myConfiguration.AmqpQueueInsertedData, // name
		false,                                 // durable
		false,                                 // delete when unused
		false,                                 // exclusive
		false,                                 // no-wait
		nil,                                   // arguments
	)
	failOnError(err, "Failed to declare a queue")

	err = ch.Qos(
		10,    // prefetch count
		0,     // prefetch size
		false, // global
	)
	failOnError(err, "Failed to set queue QoS")

	err = ch.QueueBind(
		q.Name,                                   // queue name
		"",                                       // routing key
		myConfiguration.AmqpExchangeInsertedData, // exchange
		false,
		nil)
	failOnError(err, "Failed to bind a queue")

	msgs, err := ch.Consume(
		q.Name, // queue
		"",     // consumer
		true,   // auto-ack
		false,  // exclusive
		false,  // no-local
		false,  // no-wait
		nil,    // args
	)
	failOnError(err, "Failed to register a consumer")

	log.Println("AMQP new data started")

waitForMessages:
	for {
		select {
		case err := <-notify:
			if err != nil {
				log.Println(err.Error())
			}
			break waitForMessages
		case d := <-msgs:
			log.Printf(" [a] New data received")
			newDataChannel <- d
		}
	}

	log.Fatal("New data subscribe channel closed")
}

func subscribeToRabbitMovedGateway() {
	// Start thread that listens for new amqp messages
	conn, err := amqp.Dial("amqp://" + myConfiguration.AmqpUser + ":" + myConfiguration.AmqpPassword + "@" + myConfiguration.AmqpHost + ":" + myConfiguration.AmqpPort + "/")
	failOnError(err, "Failed to connect to RabbitMQ")
	defer conn.Close()

	// Create a channel for errors
	notify := conn.NotifyClose(make(chan *amqp.Error)) //error channel

	ch, err := conn.Channel()
	failOnError(err, "Failed to open a channel")
	defer ch.Close()

	err = ch.ExchangeDeclare(
		myConfiguration.AmqpExchangeGatewayMoved, // name
		"fanout",                                 // type
		true,                                     // durable
		false,                                    // auto-deleted
		false,                                    // internal
		false,                                    // no-wait
		nil,                                      // arguments
	)
	failOnError(err, "Failed to declare an exchange")

	q, err := ch.QueueDeclare(
		myConfiguration.AmqpQueueGatewayMoved, // name
		false,                                 // durable
		false,                                 // delete when unused
		false,                                 // exclusive
		false,                                 // no-wait
		nil,                                   // arguments
	)
	failOnError(err, "Failed to declare a queue")

	err = ch.Qos(
		10,    // prefetch count
		0,     // prefetch size
		false, // global
	)
	failOnError(err, "Failed to set queue QoS")

	err = ch.QueueBind(
		q.Name,                                   // queue name
		"",                                       // routing key
		myConfiguration.AmqpExchangeGatewayMoved, // exchange
		false,
		nil)
	failOnError(err, "Failed to bind a queue")

	msgs, err := ch.Consume(
		q.Name, // queue
		"",     // consumer
		true,   // auto-ack
		false,  // exclusive
		false,  // no-local
		false,  // no-wait
		nil,    // args
	)
	failOnError(err, "Failed to register a consumer")

	log.Println("AMQP gateway moved started")

waitForMessages:
	for {
		select {
		case err := <-notify:
			if err != nil {
				log.Println(err.Error())
			}
			break waitForMessages
		case d := <-msgs:
			log.Printf(" [a] Gateway move received")
			gatewayMovedChannel <- d
		}
	}

	log.Fatal("Gateway moved subscribe channel closed")

}