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fake_mqtt_server.rb 4.0KB

    #!/usr/bin/env ruby # # This is a 'fake' MQTT server to help with testing client implementations # # See https://github.com/njh/ruby-mqtt/blob/master/spec/fake_server.rb # # It behaves in the following ways: # * Responses to CONNECT with a successful CONACK # * Responses to PUBLISH by echoing the packet back # * Responses to SUBSCRIBE with SUBACK and a PUBLISH to the topic # * Responses to PINGREQ with PINGRESP # * Responses to DISCONNECT by closing the socket # # It has the following restrictions # * Doesn't deal with timeouts # * Only handles a single connection at a time # $:.unshift File.dirname(__FILE__)+'/../lib' require 'logger' require 'socket' require 'mqtt' class MQTT::FakeServer attr_reader :address, :port attr_reader :last_publish attr_reader :thread attr_reader :pings_received attr_accessor :just_one attr_accessor :logger # Create a new fake MQTT server # # If no port is given, bind to a random port number # If no bind address is given, bind to localhost def initialize(bind_address='127.0.0.1') @address = bind_address end # Get the logger used by the server def logger @logger ||= Logger.new(STDOUT) end # Start the thread and open the socket that will process client connections def start @socket ||= TCPServer.new(@address, 0) @address = @socket.addr[3] @port = @socket.addr[1] @thread ||= Thread.new do logger.info "Started a fake MQTT server on #{@address}:#{@port}" @times = 0 loop do @times += 1 # Wait for a client to connect client = @socket.accept @pings_received = 0 handle_client(client) break if just_one end end end # Stop the thread and close the socket def stop logger.info "Stopping fake MQTT server" @socket.close unless @socket.nil? @socket = nil @thread.kill if @thread and @thread.alive? @thread = nil end # Start the server thread and wait for it to finish (possibly never) def run start begin @thread.join rescue Interrupt stop end end protected # Given a client socket, process MQTT packets from the client def handle_client(client) loop do packet = MQTT::Packet.read(client) logger.debug packet.inspect case packet when MQTT::Packet::Connect client.write MQTT::Packet::Connack.new(:return_code => 0) when MQTT::Packet::Publish client.write packet @last_publish = packet when MQTT::Packet::Subscribe client.write MQTT::Packet::Suback.new( :message_id => packet.message_id, :granted_qos => 0 ) topic = packet.topics[0][0] case @times when 1, ->x { x >= 3 } # Deliver retained messages client.write MQTT::Packet::Publish.new( :topic => topic, :payload => "did you know about #{topic}", :retain => true ) client.write MQTT::Packet::Publish.new( :topic => topic, :payload => "hello #{topic}", :retain => true ) when 2 # Deliver a still retained message client.write MQTT::Packet::Publish.new( :topic => topic, :payload => "hello #{topic}", :retain => true ) # Deliver a fresh message client.write MQTT::Packet::Publish.new( :topic => topic, :payload => "did you know about #{topic}", :retain => false ) end when MQTT::Packet::Pingreq client.write MQTT::Packet::Pingresp.new @pings_received += 1 when MQTT::Packet::Disconnect client.close break end end rescue MQTT::ProtocolException => e logger.warn "Protocol error, closing connection: #{e}" client.close end end if __FILE__ == $0 server = MQTT::FakeServer.new(MQTT::DEFAULT_PORT) server.logger.level = Logger::DEBUG server.run end