Golang Channel.ExchangeDeclarePassive Examples

Example #1

File: amqp-rpc.go Project: jcjones/boulder

// AMQPDeclareExchange attempts to declare the configured AMQP exchange,
// returning silently if already declared, erroring if nonexistant and
// unable to create.
func amqpDeclareExchange(conn *amqp.Connection) error {
	var err error
	var ch *amqp.Channel
	log := blog.GetAuditLogger()

	ch, err = conn.Channel()
	if err != nil {
		log.Crit(fmt.Sprintf("Could not connect Channel: %s", err))
		return err
	}

	err = ch.ExchangeDeclarePassive(
		AmqpExchange,
		AmqpExchangeType,
		AmqpDurable,
		AmqpDeleteUnused,
		AmqpInternal,
		AmqpNoWait,
		nil)
	if err != nil {
		log.Info(fmt.Sprintf("Exchange %s does not exist on AMQP server, creating.", AmqpExchange))

		// Channel is invalid at this point, so recreate
		ch.Close()
		ch, err = conn.Channel()
		if err != nil {
			log.Crit(fmt.Sprintf("Could not connect Channel: %s", err))
			return err
		}

		err = ch.ExchangeDeclare(
			AmqpExchange,
			AmqpExchangeType,
			AmqpDurable,
			AmqpDeleteUnused,
			AmqpInternal,
			AmqpNoWait,
			nil)
		if err != nil {
			log.Crit(fmt.Sprintf("Could not declare exchange: %s", err))
			ch.Close()
			return err
		}
		log.Info(fmt.Sprintf("Created exchange %s.", AmqpExchange))
	}

	ch.Close()
	return err
}