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README.md

socketcluster-client-ruby

A Ruby client for socketcluster.io

In lib/socketclusterclient, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file . To experiment with that code, run bin/console for an interactive prompt.

Refer below examples for more details.

Overview

This client provides following functionality

  • Easy to setup and use
  • Support for emitting and listening to remote events
  • Automatic reconnection
  • Pub/sub
  • Authentication (JWT)
  • Can be used for extensive unit-testing of all server side functions
  • Support for ruby >= 2.2.0

Installation

Add this line to your application's Gemfile:

gem 'socketclusterclient'

And then execute:

$ bundle

Or install it yourself as:

$ gem install socketclusterclient

Usage

Create instance of Socket class by passing url of socketcluster-server end-point

    # Create a socket instance
    socket = ScClient.new('ws://localhost:8000/socketcluster/')

Important Note : Default url to socketcluster end-point is always ws://somedomainname.com/socketcluster/.

Registering basic listeners

  • Different functions are given as an argument to register listeners
    require 'socketclusterclient'
    require 'logger'

    logger = Logger.new(STDOUT)
    logger.level = Logger::WARN

    on_connect = -> { logger.info('on connect got called') }

    on_disconnect = -> { logger.info('on disconnect got called') }

    on_connect_error = -> { logger.info('on connect error got called') }

    on_set_authentication = lambda do |socket, token|
      logger.info("Token received #{token}")
      socket.set_auth_token(token)
    end

    on_authentication = lambda do |socket, is_authenticated|
      logger.info("Authenticated is #{is_authenticated}")
    end

    socket = ScClient.new('ws://localhost:8000/socketcluster/')
    socket.set_basic_listener(on_connect, on_disconnect, on_connect_error)
    socket.set_authentication_listener(on_set_authentication, on_authentication)
    socket.connect

Connecting to server

  • For connecting to server
    # This will send websocket handshake request to socketcluster-server
    socket.connect
  • By default reconnection to server is disabled, so to enable automatic reconnection
    # This will set automatic-reconnection to socketcluster-server repeat it infinitely
    socket.set_reconnection(true)
  • To set delay of reconnecting to server
    # This will set automatic-reconnection to socketcluster-server with delay of 2 seconds and repeat it infinitely
    socket.set_delay(2)
    socket.connect
  • To disable automatic reconnection to server
    # This will disable reconnection to socketcluster-server
    socket.set_reconnection(false)
  • For reconnection to the server you need to set reconnection strategy
    # This will set the reconnection strategy
    socket.set_reconnection_listener(reconnect_interval, max_reconnect_interval, max_attempts)

    # default reconnection strategy
    socket.set_reconnection_listener(2000, 30_000, nil)

For example,

    socket.set_reconnection_listener(3000, 30_000, 10)  # (reconnect_inverval, max_reconnect_interval, max_attempts)
    socket.set_reconnection_listener(3000, 30_000)  # (reconnect_inverval, max_reconnect_interval)
  • You can set reconnect_interval, max_reconnect_interval and max_attempts directly as well
    socket.reconnect_interval = 2000
    socket.max_reconnect_interval = 20_000
    socket.max_attempts = 10
  • To allow reconnection to server, you need to reconnect
    # This will set automatic-reconnection to socketcluster-server with delay of 2 seconds and repeat it till the maximum attempts are finished
    socket.connect

Emitting and listening to events

Event emitter

  • To emit a specified event on the corresponding socketcluster-server. The object sent can be String, Boolean, Long or JSONObject.
    # Emit an event
    socket.emit(event_name, message);

    socket.emit("chat", "Hi")
  • To emit a specified event with acknowledgement on the corresponding socketcluster-server. The object sent can be String, Boolean, Long or JSONObject.
    # Emit an event with acknowledgment
    socket.emitack(event_name, message, ack_emit)

    socket.emitack('chat', 'Hello', ack_emit)

    ack_emit = lambda do |key, error, object|
      puts "Got ack data => #{object} and error => #{error} and key => #{key}"
    end

Event Listener

  • To listen an event from the corresponding socketcluster-server. The object received can be String, Boolean, Long or JSONObject.
    # Receive an event
    socket.on(event, message)

    socket.on('ping', message)

    message = lambda do |key, object|
      puts "Got data => #{object} from key => #{key}"
    end
  • To listen an event from the corresponding socketcluster-server and send the acknowledgment back. The object received can be String, Boolean, Long or JSONObject.
    # Receive an event and send the acknowledgement back
    socket.onack(event, message_with_acknowledgment)

    socket.onack('ping', ack_message)

    ack_message = lambda do |key, object, block_ack_message|
      puts "Got ack data => #{object} from key => #{key}"
      block_ack_message.call('error lorem', 'data ipsum')
    end

Implementing Pub-Sub via channels

Creating a channel

  • For creating and subscribing to channels
    # Subscribe to channel
    socket.subscribe('yell')

    # Subscribe to channel with acknowledgement
    socket.subscribeack('yell', ack_subscribe)

    ack_subscribe = lambda do |channel, error, _object|
      puts "Subscribed successfully to channel => #{channel}" if error == ''
    end
  • For getting list of created channels
    # Get all subscribed channel
    channels = socket.subscribed_channels

Publishing an event on channel

  • For publishing an event
    # Publish to a channel
    socket.publish('yell', 'Hi')

    # Publish to a channel with acknowledgment
    socket.publishack('yell', 'Hi', ack_publish)

    ack_publish = lambda do |channel, error, _object|
      puts "Publish sent successfully to channel => #{channel}" if error == ''
    end

Listening to channel

  • For listening to a channel event
    # Listen to a channel
    socket.onchannel('yell', channel_message)

    channel_message = lambda do |key, object|
      puts "Got data => #{object} from key => #{key}"
    end

Un-subscribing to channel

  • For unsubscribing to a channel
    # Unsubscribe to a channel
    socket.unsubscribe('yell')

    # Unsubscribe to a channel with acknowledgement
    socket.unsubscribeack('yell', ack_unsubscribe)

    ack_unsubscribe = lambda do |channel, error, _object|
      puts "Unsubscribed to channel => #{channel}" if error == ''
    end

Logger

Disabling logger

  • To get logger for logging of events
    socket.logger.info("Some information")
    socket.logger.warn("Some warning")
  • To disable logging of events
    socket.disable_logging
  • To enable logging of events
    socket.enable_logging

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/opensocket/socketcluster-client-ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

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