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json-rpc client

JSON-RPC 2.0 TCP implementation with persistent connections using promises - very fast and without dependencies

Installation

npm install json-rpc-client

Example usage

Native promise

var jsonrpc = require('json-rpc-client')

// create client and connect
var client = new jsonrpc({ port: 7070, host: '127.0.0.1'})
client.connect().then(function()
{
    // send json rpc
    client.send('add', [1,2]).then(function(reply)
    {
        // print complete reply
        console.log(reply)
    },
    //transport errors
    function(error)
    {
        console.error(error)
    })
},
function(error)
{
    console.error(error)
})

Generators (using co)

var jsonrpc = require('json-rpc-client')
var co = require('co')

// create client and connect
var client = new jsonrpc({ port: 7070, host: '127.0.0.1'})

co(function*()
{
    try
    {
        yield client.connect()

        // send json rpc
        var reply = yield client.send('add', [1,2])

        // print complete reply
        console.log(reply)
    }
    catch(error)
    {
        console.error(error)
    }
})

API

var jsonrpc = require('./jsonrpc')

jsonrpc (options)

Creates a new RPC connection object.

Options:

• host: Host the client should connect to. Defaults to '127.0.0.1'.
• port: Port the client should connect to. Defaults to '7070'.
• keepalive [optional]: if set, keepalive will set using net-keepalive

connect

Returns promise which resolves after the connection to the specified host is ready

send (methodName, parameters, notification)

Sends json data through persisted tcp connection.

methodName: string

parameters: Object/Array with parameters

notification: true/false to make notification request (no reply)

• Promise - object containing reply data along with error

close

Closes RPC connection and returns promise afterwards.

Event 'error'

• 'Error Object'

Emitted when an error occurs.

Event: 'close'

• 'had_error' 'Boolean' true if the socket had a transmission error

Emitted once the RPC connection socket is fully closed. The argument 'had_error' is a boolean which says if there was an error.