qaap-barge v2.0.1

qaap-barge

(deprecated - please use rpc-websockets)

Barge wraps the "websockets/ws" library providing JSON RPC 2.0 support on top.

Installation

npm install qaap-barge

Examples

var Barge = require('qaap-barge')

// instantiate Barge and connect to an RPC server
var ws = new Barge('ws://localhost:8080/rpc/1.0')

ws.on('open', function() {
  // call an RPC method with parameters
  ws.call('sum', [5, 3]).then(function(result) {
    require('assert').equal(result, 8)
  })

  // send a notification to an RPC server
  ws.notify('openedNewsModule')

  // subscribe to receive an event
  ws.subscribe('feedUpdated')

  ws.on('feedUpdated', function() {
    updateLogic()
  })

  // unsubscribe from an event
  ws.unsubscribe('feedUpdated')

  // close a websocket connection
  ws.close()
})

API

var Barge = require('qaap-barge')
var ws = new Barge('ws://localhost:8080/rpc/1.0')

new Barge(address, options) -> Barge

Instantiate a Barge client.

Parameters:

• address {String}: The URL of the WebSocket server. Defaults to 'ws://localhost:8080/rpc/1.0'.
• options {Object}: Client options that are also forwarded to ws.
  • autoconnect {Boolean}: Client autoconnect upon Barge class instantiation. Defaults to true.
  • reconnect {Boolean}: Whether client should reconnect automatically once the connection is down. Defaults to true.
  • reconnect_interval {Number}: Time between adjacent reconnects. Defaults to 1000.
  • max_reconnects {Number}: Maximum number of times the client should try to reconnect. Defaults to 5.

ws.call(method, params) -> Promise

Calls a registered RPC method on server. Resolves once the response is ready. Throws if an RPC error was received.

Parameters:

• method {String}: An RPC method name to run on server-side.
• params {Object|Array}: Optional parameter(s) to be sent along the request.

ws.notify(method, params)

Sends a JSON-RPC 2.0 notification to server.

Parameters:

• method {String}: An RPC method name to run on server-side.
• params {Object|Array}: Optional parameter(s) to be sent along the request.

ws.subscribe(event) -> Promise

Subscribes for a defined event.

Parameters:

• event {String}: Event name.

ws.unsubscribe(event) -> Promise

Unsubscribes from a defined event.

Parameters:

• event {String}: Event name.

ws.close([code, data])

Closes a WebSocket connection gracefully.

Parameters:

• code {Number}: Socket close code.
• data {String}: Optional data to be sent to socket before closing.

Event: 'open'

Emits when the connection is opened and ready for use.

Event: 'error'

• <Error>

Emits when a socket error is raised.

Event: 'close'

Emits when the connection is closed.

Event: <Notification>

• <Object>

Emits a notification event a client has subscribed to once the server sends it.

Example:

ws.subscribe('feedUpdated')

ws.on('feedUpdated', handlerFunction)