amqp_channel_open and amqp_channel_close needs called in every operation, likes in amqp_exchange_declare, amqp_queue_declare and so on about rabbitmq-c

[alanxz]

Does amqp_channel_open and amqp_channel_close need called in every operation, likes in amqp_exchange_declare, amqp_queue_declare, amqp_queue_bind, amqp_queue_unbind, amqp_queue_delete,amqp_basic_publish,amqp_basic_consume?

amqp_exchange_declare (and friends) need an open channel, that channel may be reused between different calls, so there is no reason to close the channel after each call. A channel may be closed by the server if one of those calls fails. If the server indicates that the channel is closed, you'll need to open a new channel before calling any new functions that require a channel.

Does amqp_basic_publish have rpc reply from rabbitmq server? I am not find in example

By default amqp_basic_publish does not get an rpc-reply from the server. You can enable publisher confirms, in which the server will send a basic.ack method when back to the client after it has successfully processed a message. https://github.com/alanxz/rabbitmq-c/blob/master/examples/amqp_producer.c has a small example where publisher confirms are not enabled

If amqp_queue_bind return NULL，i find two proccess, below . Does amqp_get_rpc_reply realy get something from rabbitmq server when amqp_queue_bind returns NULL?

If amqp_queue_bind returns NULL, you will need to use amqp_get_rpc_reply to understand why it failed, this may be due to the server returning an error.

[kongxa]

Thank you very much.

By default amqp_basic_publish does not get an rpc-reply from the server. You can enable publisher confirms, in which the server will send a basic.ack method when back to the client after it has successfully processed a message. https://github.com/alanxz/rabbitmq-c/blob/master/examples/amqp_producer.c has a small example where publisher confirms are not enabled

If publisher confirms are not enabled, amqp_basic_publish does not get an rpc-reply from the server, amqp_get_rpc_reply was called anyway. Will the process be blocked by this call？

If amqp_queue_bind returns NULL, you will need to use amqp_get_rpc_reply to understand why it failed, this may be due to the server returning an error.

If amqp_queue_bind return success, do i need to call amqp_get_rpc_reply? I have known the result, but if i no need to call amqp_get_rpc_reply，will some rpc reply be left in rabbitmq client or connection？

[alanxz]

If amqp_queue_bind return success, do i need to call amqp_get_rpc_reply?

No, you only need to call it when amqp_queue_bind returns NULL.