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aiomas – A library for multi-agent systems and RPC based on asyncio =================================================================== .. image:: https://gitlab.com/sscherfke/aiomas/badges/master/pipeline.svg :height: 20px :alt: pipeline status :target: https://gitlab.com/sscherfke/aiomas/commits/master .. image:: https://gitlab.com/sscherfke/aiomas/badges/master/coverage.svg :height: 20px :alt: coverage report :target: https://gitlab.com/sscherfke/aiomas/commits/master *aiomas* is an easy-to-use library for *request-reply channels*, *remote procedure calls (RPC)* and *multi-agent systems (MAS)*. It’s written in pure Python on top of asyncio__. Here are three simple examples that show the different layers of aiomas and what they add on top of each other: The *request-reply channel* has the lowest level of abstraction (but already offers more then vanilla asyncio): .. code-block:: python3 >>> import aiomas >>> >>> >>> async def handle_client(channel): ... """Handle a client connection.""" ... req = await channel.recv() ... print(req.content) ... await req.reply('cya') ... await channel.close() >>> >>> >>> async def client(): ... """Client coroutine: Send a greeting to the server and wait for a ... reply.""" ... channel = await aiomas.channel.open_connection(('localhost', 5555)) ... rep = await channel.send('ohai') ... print(rep) ... await channel.close() >>> >>> >>> server = aiomas.run(aiomas.channel.start_server(('localhost', 5555), handle_client)) >>> aiomas.run(client()) ohai cya >>> server.close() >>> aiomas.run(server.wait_closed()) The *RPC layer* adds remote procedure calls on top of it: .. code-block:: python3 >>> import aiomas >>> >>> >>> class MathServer: ... router = aiomas.rpc.Service() ... ... @router.expose ... def add(self, a, b): ... return a + b ... >>> >>> async def client(): ... """Client coroutine: Call the server's "add()" method.""" ... rpc_con = await aiomas.rpc.open_connection(('localhost', 5555)) ... rep = await rpc_con.remote.add(3, 4) ... print('What’s 3 + 4?', rep) ... await rpc_con.close() >>> >>> server = aiomas.run(aiomas.rpc.start_server(('localhost', 5555), MathServer())) >>> aiomas.run(client()) What’s 3 + 4? 7 >>> server.close() >>> aiomas.run(server.wait_closed()) Finally, the *agent layer* hides some of the boilerplate code required to setup the sockets and allows agent instances to easily talk with each other: .. code-block:: python3 >>> import aiomas >>> >>> class TestAgent(aiomas.Agent): ... def __init__(self, container): ... super().__init__(container) ... print('Ohai, I am %s' % self) ... ... async def run(self, addr): ... remote_agent = await self.container.connect(addr) ... ret = await remote_agent.service(42) ... print('%s got %s from %s' % (self, ret, remote_agent)) ... ... @aiomas.expose ... def service(self, value): ... return value >>> >>> c = aiomas.Container.create(('localhost', 5555)) >>> agents = [TestAgent(c) for i in range(2)] Ohai, I am TestAgent('tcp://localhost:5555/0') Ohai, I am TestAgent('tcp://localhost:5555/1') >>> aiomas.run(until=agents[0].run(agents[1].addr)) TestAgent('tcp://localhost:5555/0') got 42 from TestAgentProxy('tcp://localhost:5555/1') >>> c.shutdown() *aiomas* is released under the MIT license. It requires Python 3.4 and above and runs on Linux, OS X, and Windows. __ https://docs.python.org/3/library/asyncio.html Installation ------------ *aiomas* requires Python >= 3.6 (or PyPy3 >= 5.10.0). It uses the *JSON* codec by default and only has pure Python dependencies. Install *aiomas* via pip__ by running: .. code-block:: bash $ pip install aiomas You can enable the optional MsgPack__ codec or its Blosc__ compressed version by installing the corresponding features (note, that you need a C compiler to install them): .. code-block:: bash $ pip install aiomas[mp] # Enables the MsgPack codec $ pip install aiomas[mpb] # Enables the MsgPack and MsgPackBlosc codecs __ https://pip.pypa.io/ __ https://pypi.python.org/pypi/msgpack-python/ __ https://pypi.python.org/pypi/blosc/ Features -------- *aiomas* just puts three layers of abstraction around raw TCP / unix domain sockets provided by *asyncio*: Agents and agent containers: The top-layer provides a simple base class for your own agents. All agents live in a container. Containers take care of creating agent instances and performing the communication between them. The container provides a *clock* for the agents. This clock can either be synchronized with the real (wall-clock) time or be set by an external process (e.g., other simulators). RPC: The *rpc* layer implements remote procedure calls which let you call methods on remote objects nearly as if they were normal objects: Instead of ``ret = obj.meth(arg)`` you write ``ret = await obj.meth(arg)``. Request-reply channel: The *channel* layer is the basis for the *rpc* layer. It sends JSON__ or MsgPack__ encoded byte strings over TCP or unix domain sockets. It also maps replies (of success or failure) to their corresponding request. Other features: - TLS support for authorization and encrypted communication. - Interchangeable and extensible codecs: JSON and MsgPack (the latter optionally compressed with Blosc) are built-in. You can add custom codecs or write (de)serializers for your own objects to extend a codec. - Deterministic, emulated sockets: A *LocalQueue* transport lets you send and receive message in a deterministic and reproducible order within a single process. This helps testing and debugging distributed algorithms. __ http://www.json.org/ __ http://msgpack.org/ Planned features ^^^^^^^^^^^^^^^^ Some ideas for future releases: - Optional automatic re-connect after connection loss Contribute ---------- - Issue Tracker: https://gitlab.com/sscherfke/aiomas/issues - Source Code: https://gitlab.com/sscherfke/aiomas Set-up a development environment with: .. code-block:: bash $ virtualenv -p `which python3` aiomas $ pip install -r requirements-setup.txt Run the tests with: .. code-block:: bash $ pytest $ # or $ tox Support ------- - Documentation: https://aiomas.readthedocs.io/en/latest/ - Mailing list: https://groups.google.com/forum/#!forum/python-tulip - Stack Overflow: http://stackoverflow.com/questions/tagged/aiomas - IRC: #asyncio License ------- The project is licensed under the MIT license.

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