jsonrpc2 0.4

WSGI Framework for JSON RPC 2.0

.. -*- restructuredtext -*-

.. image:: https://drone.io/bitbucket.org/aodag/jsonrpc2/status.png
:target: https://drone.io/bitbucket.org/aodag/jsonrpc2/latest

jsonrpc2 is WSGI Framework for JSON RPC 2.0.

JSON RPC 2.0 Spec can be seen on http://www.jsonrpc.org/specification .

.. contents::

QuickStart
==========================================

install via pip::

$ pip install jsonrpc2

write your procedures in hello.py::

def greeting(name):
return dict(message="Hello, %s!" % name)

run jsonrpc2 server::

$ runjsonrpc2 hello


Integration with Paste Script
===============================================

create project with paste script template::

$ paster create -t paster_jsonrpc2 myrpc
$ cd myrpc

run server

$ paster serve run.ini

access http://localhost:8080/


Internal
===============================

::

>>> import json
>>> from jsonrpc2 import JsonRpcApplication

sample procedure::

>>> def greeting(name="world"):
... return "Hello, %s!" % name

create rpc application::

>>> app = JsonRpcApplication(rpcs=dict(greeting=greeting))

set up for test::

>>> from webtest import TestApp
>>> testapp = TestApp(app)

call procedure::

>>> call_values = {'jsonrpc':'2.0', 'method':'greeting', 'id':'greeting'}
>>> res = testapp.post('/', params=json.dumps(call_values), content_type="application/json")

got results::

>>> res.json
{u'jsonrpc': u'2.0', u'id': u'greeting', u'result': u'Hello, world!'}


lazy loading::

>>> app.rpc.methods['sample.add'] = 'tests.sample:add'
>>> call_values = {'jsonrpc':'2.0', 'method':'sample.add', 'id':'sample.add', 'params':[1, 2]}
>>> res = testapp.post('/', params=json.dumps(call_values), content_type="application/json")
>>> res.json
{u'jsonrpc': u'2.0', u'id': u'sample.add', u'result': 3}


extra vars
==================

::

>>> from jsonrpc2 import JsonRpc
>>> rpc = JsonRpc()
>>> rpc['add'] = lambda a, b: a + b
>>> rpc({'jsonrpc': '2.0', 'method': 'add', 'id': 'rpc-1', 'params': {'a': 2}}, b=3)
{'jsonrpc': '2.0', 'id': 'rpc-1', 'result': 5}

handle errors
=================

::

>>> from jsonrpc2 import JsonRpc
>>> class MyException(Exception):
... pass
>>> def my_rpc():
... raise MyException()
>>> rpc = JsonRpc({'call': my_rpc}, {MyException: -32001})
>>> rpc({'jsonrpc': '2.0', 'method': 'call', 'id': 'rpc-1', 'params': []})
{'jsonrpc': '2.0', 'id': 'rpc-1', 'error': {'message': '', 'code': -32001, 'data': '[]'}}


JSON-RPC2 Example
=====================================================

use raw rpc processor::

>>> from jsonrpc2 import JsonRpc
>>> rpc = JsonRpc()

sample procedures::

>>> def subtract(minuend, subtrahend):
... return minuend - subtrahend
>>> def update(*args):
... pass
>>> def foobar():
... pass

register procedures with dict interface::

>>> rpc['subtract'] = subtract
>>> rpc['update'] = update
>>> rpc['foobar'] = foobar

Procedure Call with positional parameters::

>>> rpc({"jsonrpc": "2.0", "method": "subtract", "params": [42, 23], "id": 1})
{'jsonrpc': '2.0', 'id': 1, 'result': 19}

>>> rpc({"jsonrpc": "2.0", "method": "subtract", "params": [23, 42], "id": 2})
{'jsonrpc': '2.0', 'id': 2, 'result': -19}

Procedure Call with named parameters::

>>> rpc({"jsonrpc": "2.0", "method": "subtract", "params": {"subtrahend": 23, "minuend": 42}, "id": 3})
{'jsonrpc': '2.0', 'id': 3, 'result': 19}

>>> rpc({"jsonrpc": "2.0", "method": "subtract", "params": {"minuend": 42, "subtrahend": 23}, "id": 4})
{'jsonrpc': '2.0', 'id': 4, 'result': 19}

Notification::

>>> rpc({"jsonrpc": "2.0", "method": "update", "params": [1,2,3,4,5]})
>>> rpc({"jsonrpc": "2.0", "method": "foobar"})

Procedure Call of non-existent procedure::

>>> del rpc['foobar']
>>> rpc({"jsonrpc": "2.0", "method": "foobar", "id": "1"})
{'jsonrpc': '2.0', 'id': '1', 'error': {'message': 'Method Not Found', 'code': -32601}}

Procedure Call with invalid JSON-RPC::

>>> rpc([1,2,3])
{'jsonrpc': '2.0', 'id': None, 'error': {'message': 'Invalid Request', 'code': -32600}}

>>> rpc({"jsonrpc": "2.0", "method": 1, "params": "bar"})
{'jsonrpc': '2.0', 'id': None, 'error': {'message': 'Invalid Request', 'code': -32600}}


Batched Call::

>>> rpc['sum'] = lambda *args: reduce(lambda a, b: a + b, args)
>>> def get_data():
... return ["hello", 5]
>>> rpc['get_data'] = get_data
>>> result = rpc ([ {"jsonrpc": "2.0", "method": "sum", "params": [1,2,4], "id": "1"},
... {"jsonrpc": "2.0", "method": "notify_hello", "params": [7]},
... {"jsonrpc": "2.0", "method": "subtract", "params": [42,23], "id": "2"},
... {"foo": "boo"},
... {"jsonrpc": "2.0", "method": "foo.get", "params": {"name": "myself"}, "id": "5"},
... {"jsonrpc": "2.0", "method": "get_data", "id": "9"} ])
>>> from pprint import pprint
>>> pprint(result)
[{'id': '1', 'jsonrpc': '2.0', 'result': 7},
{'error': {'code': -32601, 'message': 'Method Not Found'},
'id': None,
'jsonrpc': '2.0'},
{'id': '2', 'jsonrpc': '2.0', 'result': 19},
{'error': {'code': -32600, 'message': 'Invalid Request'},
'id': None,
'jsonrpc': '2.0'},
{'error': {'code': -32601, 'message': 'Method Not Found'},
'id': '5',
'jsonrpc': '2.0'},
{'id': '9', 'jsonrpc': '2.0', 'result': ['hello', 5]}]



ChangeLog
===================================================

0.4
-----------------------------------------------
feature

- added supporting py3
- added registering application errors

fixed bugs

- Dont raise internal error for server exceptions `#13 <https://bitbucket.org/aodag/jsonrpc2/issue/13/dont-raise-internal-error-for-server>`_
- incorrect Content-type `#15 https://bitbucket.org/aodag/jsonrpc2/issue/15/incorrect-content-type`_
- internal logging configuration broken `#16 <https://bitbucket.org/aodag/jsonrpc2/issue/16/internal-logging-configuration-broken>`_

0.3
-----------------------------------------------

- fix bugs
- Paste Scripte templates
- runjsonrpc2 command

0.3.1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- fix bugs (content-type with charset)

0.3.2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- enable to pass the extra vars to procedures

0.2
-----------------------------------------------

- remove dependency to WebOb
- split procedure call class from web application class

0.2.1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- lazy loading from method name.

0.2.2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- add dict interface.

0.2.3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- fix: read body with CONTENT_LENGTH.