home_data/gatherer/connections.go

117 lines
2.2 KiB
Go

package main
import (
"log"
"os"
"time"
amqp "github.com/rabbitmq/amqp091-go"
)
type AMQPConnection struct {
conn *amqp.Connection
channel *amqp.Channel
error_channel chan *amqp.Error
observers []chan<- bool
}
func (amqpConn *AMQPConnection) Init() {
amqpConn.error_channel = make(chan *amqp.Error)
}
func (amqpConn *AMQPConnection) Connect() error {
amqpConn.Close()
amqp_url := os.Getenv("AMQP_URL")
for {
conn, err := amqp.Dial(amqp_url)
if err != nil {
log.Printf("Failed to connect to RabbitMQ: %s", err)
time.Sleep(5 * time.Second)
} else {
amqpConn.conn = conn
break
}
}
ch, err := amqpConn.conn.Channel()
if err != nil {
return err
}
amqpConn.channel = ch
amqpConn.channel.NotifyClose(amqpConn.error_channel)
go func() {
for err := range amqpConn.error_channel {
log.Printf("AMQP error: %s", err)
amqpConn.Connect()
log.Println("Reconnected to RabbitMQ")
for _, observer := range amqpConn.observers {
observer <- true
log.Println("Notified observer")
}
}
}()
return nil
}
func (amqpConn *AMQPConnection) ConnectToQueue(name string, routing_key string) (<-chan amqp.Delivery, error) {
q, err := amqpConn.channel.QueueDeclare(
name, // name
false, // durable
false, // delete when unused
true, // exclusive
false, // no-wait
nil, // arguments
)
if err != nil {
return nil, err
}
err = amqpConn.channel.QueueBind(
q.Name, // queue name
routing_key, // routing key
"amq.topic", // exchange
false,
nil,
)
if err != nil {
return nil, err
}
msgs, err := amqpConn.channel.Consume(
q.Name, // queue
"", // consumer
true, // auto ack
false, // exclusive
false, // no local
false, // no wait
nil, // args
)
if err != nil {
return nil, err
}
return msgs, nil
}
func (amqpConn *AMQPConnection) NotifyError() <-chan bool {
notify := make(chan bool)
amqpConn.observers = append(amqpConn.observers, notify)
return notify
}
func (amqpConn *AMQPConnection) Close() {
if amqpConn.channel != nil {
amqpConn.channel.Close()
}
if amqpConn.conn != nil {
amqpConn.conn.Close()
}
amqpConn.channel = nil
amqpConn.conn = nil
}