We are writing C++ code which needs messaging. Is there a free/open-source and stable AMQP server available that has equally stable C++ client library with it. We also need to provide Python interface of our code to users (idea is to do maximum stuff in C++ and expose the API in Python).
What can be best way to achieve this.
AMQP can be quite complex to understand -- I suggest Using Protocol Buffers to code your communication layer, it generates both python and C++. if your needs are too complicated I would suggest ICE as it supports every programming language you can think of, and I believe it also handles the protocol buffers format.
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If you are going to use AMQP, you should look at Zero MQ. It has a C++ implementation of AMQP. However they are porting it to a pure-C implementation.
Apache QPid seems to be relevant here. There's a C++ broker/client library here.
Note that since you're programming to a protocol (AMQP), your broker/client don't have to be in the same language. e.g. I'm using Scala and C# clients talking to RabbitMQ (an Erlang broker).
For future reference, take a look at Apache Qpid - it has a C++ client library and is very good. The problem for your use-case is that Rabbit implements AMQP 0-8 and the Qpid C++ client talks AMQP 0-10.