class MQTT::Proxy

Class for implementing a proxy to filter/mangle MQTT packets.

Attributes

local_host[R]

Address to bind listening socket to

local_port[R]

Port to bind listening socket to

logger[R]

Ruby Logger object to send informational messages to

select_timeout[R]

Time in seconds before disconnecting an idle connection

server_host[R]

Address of upstream server to send packets upstream to

server_port[R]

Port of upstream server to send packets upstream to.

Public Class Methods

new(args={}) click to toggle source

Create a new MQTT Proxy instance.

Possible argument keys:

:local_host      Address to bind listening socket to.
:local_port      Port to bind listening socket to.
:server_host     Address of upstream server to send packets upstream to.
:server_port     Port of upstream server to send packets upstream to.
:select_timeout  Time in seconds before disconnecting a connection.
:logger          Ruby Logger object to send informational messages to.

NOTE: be careful not to connect to yourself!

# File lib/mqttbridge/proxy.rb, line 33
def initialize(args={})
  @local_host = args[:local_host] || '0.0.0.0'
  @local_port = args[:local_port] || MQTT::DEFAULT_PORT
  @server_host = args[:server_host]
  @server_port = args[:server_port] || 18830
  @select_timeout = args[:select_timeout] || 60

  # Setup a logger
  @logger = args[:logger]
  if @logger.nil?
    @logger = Logger.new(STDOUT)
    @logger.level = Logger::INFO
  end

  # Default is not to have any filters
  @client_filter = nil
  @server_filter = nil

  # Create TCP server socket
  @server = TCPServer.open(@local_host,@local_port)
  @logger.info "MQTT::Proxy listening on #{@local_host}:#{@local_port}"
end

Public Instance Methods

client_filter=(proc) click to toggle source

Set a filter Proc for packets coming from the client (to the server).

# File lib/mqttbridge/proxy.rb, line 57
def client_filter=(proc)
  @client_filter = proc
end

run() click to toggle source

Start accepting connections and processing packets.

# File lib/mqttbridge/proxy.rb, line 67
def run
  loop do
    # Wait for a client to connect and then create a thread for it
    Thread.new(@server.accept) do |client_socket|
      logger.info "Accepted client: #{client_socket.peeraddr.join(':')}"
      server_socket = TCPSocket.new(@server_host,@server_port)
      begin
        process_packets(client_socket,server_socket)
      rescue Exception => exp
        logger.error exp.to_s
      end
      logger.info "Disconnected: #{client_socket.peeraddr.join(':')}"
      server_socket.close
      client_socket.close
    end
  end
end

server_filter=(proc) click to toggle source

Set a filter Proc for packets coming from the server (to the client).

# File lib/mqttbridge/proxy.rb, line 62
def server_filter=(proc)
  @server_filter = proc
end