agent_zmq

Agent framework designed for testing ZeroMQ Applications

Usage

Agent Types

The agent types correspond to underlying ZMQ Socket type under test

ZMQ_SUB

Connects or Binds to local address
Includes message caching for inspection

ZMQ_PUB

Connects or Binds to local address
Publishes

ZMQ_REQ

Connects or Binds to local address
Publishes request, returns response

ZMQ_REP

Connects or Binds to local address
Listens for request, sends response

Configuration

Inside of your project, declare your agents inside of config/zmq_agents.rb like this:

require 'agent_zmq'

AgentZMQ.define_ZMQ_SUB :my_sub_agent do |a|
  a.socket_opts << {ZMQ::SUBSCRIBE=>'com.connamara.BODPosition'}
  a.end_point_type=:bind
  a.end_point='tcp://*:5556'
end

AgentZMQ.define_ZMQ_PUB :my_pub_agent do |a|
  a.end_point_type=:connect
  a.end_point='tcp://127.0.0.1:5558'
end

AgentZMQ.define_ZMQ_REQ :my_req_agent do |a|
  a.end_point_type=:connect
  a.end_point='tcp://127.0.0.1:5552'
end

AgentZMQ.define_ZMQ_REP :my_rep_agent do |a|
  a.reply = Proc.new {|msg| "ok"}
  a.end_point_type=:bind
  a.end_point='tcp://*:5552'
end

Starting, Stopping and Resetting

require 'agent_zmq'
AgentZMQ.start
at_exit { AgentZMQ.stop }

You may want to reset the agent states between tests without stopping and starting. This may be done with AgentZMQ.reset

Getting your agent

Grab the agent by the name given in the config file

my_agent = AgentZMQ.agents_hash[:my_sub_agent]

Agent Interfaces

ZMQ_SUB

This agent provides a message cache

all_messages_received = my_sub_agent.messages_received

# returns and removes the last message received from the cache
last_message_received = my_sub_agent.pop

On reset, the sub agent cache is cleared

ZMQ_PUB

The publish method takes a single message of one or more parts

my_pub_agent.publish "single part message"
my_pub_agent.publish ["part 1", "part 2"]

ZMQ_REQ

The publish method takes a single message of one or more parts. The agent blocks until a response is received and returned as an array of message parts

response = my_req_agent.publish "single part message"
response = my_pub_agent.publish ["part 1", "part 2"]

ZMQ_REP

Like the ZMQ_SUB agent, ZMQ_REP provides a message cache

all_messages_received = my_rep_agent.messages_received

# returns and removes the last message received from the cache
last_message_received = my_rep_agent.pop

When receiving requests, the agent will reply with the output of the reply Proc. The return value of this proc may be in the form of a multi-part message.

Cucumber

There is some support for cucumber. See features for example usage.

Check out specs and features to see all the ways you can use agent_zmq.

Install

gem install agent_zmq

or add the following to Gemfile:

gem 'agent_zmq'

and run bundle install from your shell.

More Information

Contributing

Please see the contribution guidelines.

Credits

Contributers:

Chris Busbey
Brad Haan

agent_zmq is maintained and funded by Connamara Systems, llc.

The names and logos for Connamara Systems are trademarks of Connamara Systems, llc.

Licensing

This software is available under the GPL and a commercial license. Please see the LICENSE file for the terms specified by the GPL license. The commercial license offers more flexible licensing terms compared to the GPL, and includes support services. Contact us for more information on the Connamara commercial license, what it enables, and how you can start developing with it.