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package amqp
import (
"fmt"
"github.com/cenkalti/backoff/v4"
"github.com/spiral/errors"
"github.com/streadway/amqp"
)
// redialer used to redial to the rabbitmq in case of the connection interrupts
func (j *JobsConsumer) redialer() { //nolint:gocognit
go func() {
const op = errors.Op("rabbitmq_redial")
for err := range j.conn.NotifyClose(make(chan *amqp.Error)) {
if err != nil {
j.Lock()
j.logger.Error("connection closed, reconnecting", "error", err)
expb := backoff.NewExponentialBackOff()
// set the retry timeout (minutes)
expb.MaxElapsedTime = j.retryTimeout
op := func() error {
j.logger.Warn("rabbitmq reconnecting, caused by", "error", err)
var dialErr error
j.conn, dialErr = amqp.Dial(j.connStr)
if dialErr != nil {
return fmt.Errorf("fail to dial server endpoint: %v", dialErr)
}
j.logger.Info("rabbitmq dial succeed. trying to redeclare queues and subscribers")
// re-init connection
errInit := j.initRabbitMQ()
if errInit != nil {
j.logger.Error("error while redialing", "error", errInit)
return errInit
}
// redeclare consume channel
var errConnCh error
j.consumeChan, errConnCh = j.conn.Channel()
if errConnCh != nil {
return errors.E(op, errConnCh)
}
// redeclare publish channel
var errPubCh error
j.publishChan, errPubCh = j.conn.Channel()
if errPubCh != nil {
return errors.E(op, errPubCh)
}
// start reading messages from the channel
deliv, err := j.consumeChan.Consume(
j.queue,
j.consumeID,
false,
false,
false,
false,
nil,
)
if err != nil {
return errors.E(op, err)
}
// restart listener
j.listener(deliv)
j.logger.Info("queues and subscribers redeclare succeed")
return nil
}
retryErr := backoff.Retry(op, expb)
if retryErr != nil {
j.Unlock()
j.logger.Error("backoff failed", "error", retryErr)
return
}
j.Unlock()
}
}
}()
}
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