udemy-go-microservices/listener-service/main.go

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package main
import (
"fmt"
"listener/event"
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"log"
"math"
"os"
"time"
amqp "github.com/rabbitmq/amqp091-go"
)
func main() {
// try to connect to rabbitmq
rabbitConn, err := connect()
if err != nil {
log.Println(err)
os.Exit(1)
}
defer rabbitConn.Close()
log.Println("Connected to RabbitMQ")
// start listening for messages
log.Println("Listening for and consuming RabbitMQ messages...")
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// create consumer
consumer, err := event.NewConsumer(rabbitConn)
if err != nil {
log.Panic(err)
}
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// watch the queue and consume events
err = consumer.Listen([]string{"log.INFO", "log.WARNING", "log.ERROR"})
if err != nil {
log.Println(err)
}
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}
func connect() (*amqp.Connection, error) {
var counts int64
var connection *amqp.Connection
// don't continue until rabbit is ready
for {
c, err := amqp.Dial("amqp://guest:guest@rabbitmq") // XXX: credentials
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if err != nil {
fmt.Println("RabbitMQ not yet ready...")
counts++
} else {
connection = c
break
}
if counts > 5 {
fmt.Println(err)
return nil, err
}
backOff := time.Duration(math.Pow(float64(counts), 2) * float64(time.Second))
log.Println("backing off...")
time.Sleep(backOff)
}
return connection, nil
}