amqp-consume

NAME

amqp-consume — Consume messages from a queue on an AMQP server

SYNOPSIS

amqp-consume OPTION command args

Description

amqp-consume consumes messages from a queue on an AMQP server. For each message that arrives, a receiving command is run, with the message body supplied to it on standard input.

amqp-consume can consume from an existing queue, or it can create a new queue. It can optionally bind the queue to an existing exchange.

By default, messages will be consumed with explicit acknowledgements. A message will only be acknowledged if the receiving command exits successfully (i.e. with an exit code of zero). The AMQP `` no ack'' mode (a.k.a. auto-ack mode) can be enable with the -A option.

Options

-q

--queue=queue name: The name of the queue to consume messages from.

: If the --queue option is omitted, the AMQP server will assign a unique name to the queue, and that server-assigned name will be dixsplayed on stderr; this case implies that an exclusive queue should be declared.

-e

--exchange=exchange name: Specifies that an exclusive queue should be declared, and bound to the given exchange. The specified exchange should already exist unless the --exchange-type option is used to request the creation of an exchange.

-r

--routing-key=routing key: The routing key for binding. If omitted, an empty routing key is assumed.

-d

--declare: Forces an exclusive queue to be declared, even when it otherwise would not be. That is, when a queue name is specified with the --queue option, but no binding to an exchange is requested with the --exchange option. Note: this option is deprecated and may be removed in a future version, use the --exclusive option to explicitly declare an exclusive queue.

-x

--exclusive: Declared queues are non-exclusive by default, this option forces declaration of exclusive queues.

-A

--no-ack=routing key: Enable ``no ack'' mode: The AMQP server will unconditionally acknowledge each message that is delivered, regardless of whether the target command exits successfully or not.

-c

--count=limit: Stop consuming after the given number of messages have been received.

-p

--prefetch-count=limit: Request the server to only send limit messages at a time.

: If any value was passed to --count, the value passed to --prefetch-count should be smaller than that, or otherwise it will be ignored.

: If -A/--no-ack is passed, this option has no effect.

Examples

Consume messages from an existing queue: ``myqueue'', and output the message bodies on standard output via cat:" 10

$  
amqp-publish -q myqueue cat

Bind a new exclusive queue to an: exchange ``myexch'', and send each message body to the script myscript, automatically acknowledging them on the server:" 10

$  
amqp-consume -A -e myexch ./myscript