jsonrpc-websocket 0.3

A JSON-RPC websocket client library for asyncio

This is a compact and simple JSON-RPC websocket client implementation for asyncio python code. This code is forked from https://github.com/gciotta/jsonrpc-requests

Main Features

• Python 3.4 & 3.5 compatible

• Supports nested namespaces (eg. app.users.getUsers())

• 100% test coverage

Usage

It is recommended to manage the aiohttp ClientSession object externally and pass it to the Server constructor. (See the aiohttp documentation.) If not passed to Server, a ClientSession object will be created automatically.

Execute remote JSON-RPC functions

import asyncio
from jsonrpc_websocket import Server

@asyncio.coroutine
def routine():
    server = Server('ws://localhost:9090')
    try:
        yield from server.ws_connect()

        yield from server.foo(1, 2)
        yield from server.foo(bar=1, baz=2)
        yield from server.foo({'foo': 'bar'})
        yield from server.foo.bar(baz=1, qux=2)
    finally:
        yield from server.close()
        yield from server.session.close()

asyncio.get_event_loop().run_until_complete(routine())

A notification

import asyncio
from jsonrpc_websocket import Server

@asyncio.coroutine
def routine():
    server = Server('ws://localhost:9090')
    try:
        yield from server.ws_connect()

        yield from server.foo(bar=1, _notification=True)
    finally:
        yield from server.close()
        yield from server.session.close()

asyncio.get_event_loop().run_until_complete(routine())

Handle requests from server to client

import asyncio
from jsonrpc_websocket import Server

def client_method(arg1, arg2):
    return arg1 + arg2

@asyncio.coroutine
def routine():
    server = Server('ws://localhost:9090')
    # client_method is called when server requests method 'namespace.client_method'
    server.namespace.client_method = client_method
    try:
        yield from server.ws_connect()
    finally:
        yield from server.close()
        yield from server.session.close()

asyncio.get_event_loop().run_until_complete(routine())

Pass through arguments to aiohttp (see also aiohttp documentation)

import asyncio
import aiohttp
from jsonrpc_websocket import Server

@asyncio.coroutine
def routine():
    server = Server(
        'ws://localhost:9090',
        auth=aiohttp.BasicAuth('user', 'pass'),
        headers={'x-test2': 'true'})
    try:
        yield from server.ws_connect()

        yield from server.foo()
    finally:
        yield from server.close()
        yield from server.session.close()

asyncio.get_event_loop().run_until_complete(routine())

Pass through aiohttp exceptions

import asyncio
import aiohttp
from jsonrpc_websocket import Server

@asyncio.coroutine
def routine():
    server = Server('ws://unknown-host')
    try:
        yield from server.ws_connect()

        yield from server.foo()
    except TransportError as transport_error:
        print(transport_error.args[1]) # this will hold a aiohttp exception instance
    finally:
        yield from server.close()
        yield from server.session.close()

asyncio.get_event_loop().run_until_complete(routine())

Tests

Install the Python tox package and run tox, it’ll test this package with various versions of Python.

Credits

@gciotta for creating the base project jsonrpc-requests.

@mbroadst for providing full support for nested method calls, JSON-RPC RFC compliance and other improvements.

@vaab for providing api and tests improvements, better RFC compliance.