// A simplified way to declare and subscribe to an AMQP queue
func amqpSubscribe(ch *amqp.Channel, name string, log *blog.AuditLogger) (msgs <-chan amqp.Delivery, err error) {
err = ch.ExchangeDeclare(
AmqpExchange,
AmqpExchangeType,
AmqpDurable,
AmqpDeleteUnused,
AmqpInternal,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not declare exchange: %s", err))
return
}
q, err := ch.QueueDeclare(
name,
AmqpDurable,
AmqpDeleteUnused,
AmqpExclusive,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not declare queue: %s", err))
return
}
err = ch.QueueBind(
name,
name,
AmqpExchange,
false,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not bind queue: %s", err))
return
}
msgs, err = ch.Consume(
q.Name,
"",
AmqpAutoAck,
AmqpExclusive,
AmqpNoLocal,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not subscribe to queue: %s", err))
return
}
return
}
// A simplified way to declare and subscribe to an AMQP queue
func amqpSubscribe(ch *amqp.Channel, name string, consumerName string, log *blog.AuditLogger) (<-chan amqp.Delivery, error) {
var err error
_, err = ch.QueueDeclare(
name,
AmqpDurable,
AmqpDeleteUnused,
AmqpExclusive,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not declare queue: %s", err))
return nil, err
}
routingKey := name
err = ch.QueueBind(
name,
routingKey,
AmqpExchange,
false,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not bind to queue [%s]. NOTE: You may need to delete %s to re-trigger the bind attempt after fixing permissions, or manually bind the queue to %s.", name, name, routingKey))
return nil, err
}
// A consumer name is used so that the specific consumer can be cancelled later
// if signalled. If no name is used a UID is used which cannot be retrieved (as
// far as I can tell).
msgs, err := ch.Consume(
name,
consumerName,
AmqpAutoAck,
AmqpExclusive,
AmqpNoLocal,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not subscribe to queue: %s", err))
return nil, err
}
return msgs, err
}
// A simplified way to declare and subscribe to an AMQP queue
func amqpSubscribe(ch *amqp.Channel, name string, log *blog.AuditLogger) (<-chan amqp.Delivery, error) {
var err error
_, err = ch.QueueDeclare(
name,
AmqpDurable,
AmqpDeleteUnused,
AmqpExclusive,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not declare queue: %s", err))
return nil, err
}
routingKey := name
err = ch.QueueBind(
name,
routingKey,
AmqpExchange,
false,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not bind to queue [%s]. NOTE: You may need to delete %s to re-trigger the bind attempt after fixing permissions, or manually bind the queue to %s.", name, name, routingKey))
return nil, err
}
msgs, err := ch.Consume(
name,
"",
AmqpAutoAck,
AmqpExclusive,
AmqpNoLocal,
AmqpNoWait,
nil)
if err != nil {
log.Crit(fmt.Sprintf("Could not subscribe to queue: %s", err))
return nil, err
}
return msgs, err
}