Distributed component model for Python.
Project description
PyCOM is simple and easy-to-use distributed component model written in Python. PyCOM makes different parts of your network application isolated and independent, while allowing easy and straightforward interaction between them. PyCOM may be seen as an easy and lightweight web services replacement.
Ideology highlights:
Non-intrusive design without black magic and lots of auto-generated code
Effective, easy-to-implement and portable protocol
Support for binary attachments of any size
Support for stateful services via HTTP-alike sessions
Low level enough to build your own frameworks
… and still simple enough to be used as is
Python 2 and Python 3 support out-of-box
Technical highlights:
Pluggable protocol support (default is JSON over ZeroMQ aka zerojson)
Easily extensible core library
Does not required special “container” software
Introspection support for services
Comprehensive test suite and documentation
Free software (new BSD license)
There is ongoing effort to create a C++ client library for PyCOM: https://bitbucket.org/divius/libpycom
Main concepts
With PyCOM you build your application as a number of services, each running in it’s own process (or even on it’s own computer). You maintain a PyCOM nameserver for finding services by their names (by the way, nameserver itself is a service).
Services provide interfaces, i.e. a named way of interacting with service. They are somewhat similar to interfaces in e.g. Java, but note that PyCOM does not perform any checks on interfaces. Interface usually has some amount of methods.
Services are identified by path with parts separated by slashes, e.g. /com/foo/group/service.
Interfaces are identified by name with parts separated by dots, e.g. com.foo.my-interface.
Examples
Service example (module service1.module1):
import pycom @pycom.interface("com.foo.example") class Query(pycom.Service): @pycom.method("create") def method_create(self, request): return {"field1" : request.args} pycom.main()
Example command line for running this service (provided nameserver is running on 192.168.10.1:2012):
python -m pycom -a tcp://192.168.10.2:2013 -n tcp://192.168.10.1:2012 service1.module1
Example client code for this service:
import pycom pycom.configure(nameserver="192.168.10.1:2012") query = pycom.locate("com.foo.example") print query.invoke("create", 42) # Prints {"field1" : 42} print query.introspect() # Prints a lot of introspection information
Quick start
To test (logs will be saved in test.log):
$ python test.py
To build HTML documentation (requires Sphinx):
$ python setup.py build_sphinx $ <your-browser> build/sphinx/html/index.html
To install:
$ python setup.py install
or via pip:
$ pip install pycom
Do not forget to read about known issues in the current version: http://packages.python.org/pycom/status.html#known-issues
Support
PyCOM repository and issue tracker are hosted on BitBucket.
Download releases: http://pypi.python.org/pypi/pycom#downloads
Latest source code: https://bitbucket.org/divius/pycom/overview
Report bugs: https://bitbucket.org/divius/pycom/issues
Read documentation: http://www.pycom.org
Enjoy =)
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