Home Explore Help
Register Sign In
J1X
/
huginn
Watch 2
Star 0
Fork 0

Browse Source
Merge pull request #368 from CloCkWeRX/add_mqtt_support

Add simple MQTT support to subscribe to, publish messages.

Andrew Cantino 11 years ago
parent
c2f7b8a041 8b089a64d0
commit
d66015c403
5 changed files with 331 additions and 0 deletions
Show Diff Stats
  1. 2 0
      Gemfile
  2. 2 0
      Gemfile.lock
  3. 138 0
      app/models/agents/mqtt_agent.rb
  4. 52 0
      spec/models/agents/mqtt_agent_spec.rb
  5. 137 0
      spec/support/fake_mqtt_server.rb

+ 2 - 0
Gemfile
View File 

@@ -74,6 +74,8 @@ gem 'slack-notifier', '~> 0.5.0'
74 74
75 75 
 gem 'therubyracer', '~> 0.12.1'
76 76
77 
+gem 'mqtt'
78 
+
77 79 
 group :development do
78 80 
   gem 'binding_of_caller'
79 81 
   gem 'better_errors'

+ 2 - 0
Gemfile.lock
View File 

@@ -160,6 +160,7 @@ GEM
160 160 
     mime-types (1.25.1)
161 161 
     mini_portile (0.5.3)
162 162 
     minitest (5.3.3)
163 
+    mqtt (0.2.0)
163 164 
     multi_json (1.9.3)
164 165 
     multi_xml (0.5.5)
165 166 
     multipart-post (2.0.0)
 
@@ -341,6 +342,7 @@ DEPENDENCIES
341 342 
   kaminari (~> 0.15.1)
342 343 
   kramdown (~> 1.3.3)
343 344 
   liquid (~> 2.6.1)
345 
+  mqtt
344 346 
   mysql2 (~> 0.3.15)
345 347 
   nokogiri (~> 1.6.1)
346 348 
   protected_attributes (~> 1.0.7)

+ 138 - 0
app/models/agents/mqtt_agent.rb
View File 

@@ -0,0 +1,138 @@
1 
+# encoding: utf-8
2 
+require "mqtt"
3 
+require "json"
4 
+
5 
+module Agents
6 
+  class MqttAgent < Agent
7 
+    description <<-MD
8 
+      The MQTT agent allows both publication and subscription to an MQTT topic.
9 
+
10 
+      MQTT is a generic transport protocol for machine to machine communication.
11 
+
12 
+      You can do things like:
13 
+
14 
+       * Publish to [RabbitMQ](http://www.rabbitmq.com/mqtt.html)
15 
+       * Run [OwnTracks, a location tracking tool](http://owntracks.org/) for iOS and Android
16 
+       * Subscribe to your home automation setup like [Ninjablocks](http://forums.ninjablocks.com/index.php?p=/discussion/661/today-i-learned-about-mqtt/p1) or [TheThingSystem](http://thethingsystem.com/dev/supported-things.html)
17 
+
18 
+      Simply choose a topic (think email subject line) to publish/listen to, and configure your service.
19 
+
20 
+      It's easy to setup your own [broker](http://jpmens.net/2013/09/01/installing-mosquitto-on-a-raspberry-pi/) or connect to a [cloud service](www.cloudmqtt.com)
21 
+
22 
+      Hints:
23 
+      Many services run mqtts (mqtt over SSL) often with a custom certificate.
24 
+
25 
+      You'll want to download their cert and install it locally, specifying the ```certificate_path``` configuration.
26 
+
27 
+
28 
+      Example configuration:
29 
+
30 
+      <pre><code>{
31 
+        'uri' => 'mqtts://user:pass@locahost:8883'
32 
+        'ssl' => :TLSv1,
33 
+        'ca_file' => './ca.pem',
34 
+        'cert_file' => './client.crt',
35 
+        'key_file' => './client.key',
36 
+        'topic' => 'huginn'
37 
+      }
38 
+      </code></pre>
39 
+
40 
+      Subscribe to CloCkWeRX's TheThingSystem instance (thethingsystem.com), where
41 
+      temperature and other events are being published.
42 
+
43 
+      <pre><code>{
44 
+        'uri' => 'mqtt://kcqlmkgx:sVNoccqwvXxE@m10.cloudmqtt.com:13858',
45 
+        'topic' => 'the_thing_system/demo'
46 
+      }
47 
+      </code></pre>
48 
+
49 
+      Subscribe to all topics
50 
+      <pre><code>{
51 
+        'uri' => 'mqtt://kcqlmkgx:sVNoccqwvXxE@m10.cloudmqtt.com:13858',
52 
+        'topic' => '/#'
53 
+      }
54 
+      </code></pre>
55 
+
56 
+      Find out more detail on [subscription wildcards](http://www.eclipse.org/paho/files/mqttdoc/Cclient/wildcard.html)
57 
+    MD
58 
+
59 
+    event_description <<-MD
60 
+      Events are simply nested MQTT payloads. For example, an MQTT payload for Owntracks
61 
+
62 
+      <pre><code>{
63 
+        "topic": "owntracks/kcqlmkgx/Dan",
64 
+        "message": {"_type": "location", "lat": "-34.8493644", "lon": "138.5218119", "tst": "1401771049", "acc": "50.0", "batt": "31", "desc": "Home", "event": "enter"},
65 
+        "time": 1401771051
66 
+      }</code></pre>
67 
+    MD
68 
+
69 
+    def validate_options
70 
+      unless options['uri'].present? &&
71 
+        options['topic'].present?
72 
+        errors.add(:base, "topic and uri are required")
73 
+      end
74 
+    end
75 
+
76 
+    def working?
77 
+      event_created_within?(options['expected_update_period_in_days']) && !recent_error_logs?
78 
+    end
79 
+
80 
+    def default_options
81 
+      {
82 
+        'uri' => 'mqtts://user:pass@locahost:8883',
83 
+        'ssl' => :TLSv1,
84 
+        'ca_file'  => './ca.pem',
85 
+        'cert_file' => './client.crt',
86 
+        'key_file' => './client.key',
87 
+        'topic' => 'huginn',
88 
+        'max_read_time' => '10'
89 
+      }
90 
+    end
91 
+
92 
+    def mqtt_client
93 
+      @client ||= MQTT::Client.new(options['uri'])
94 
+
95 
+      if options['ssl']
96 
+        @client.ssl = options['ssl'].to_sym
97 
+        @client.ca_file = options['ca_file']
98 
+        @client.cert_file = options['cert_file']
99 
+        @client.key_file = options['key_file']
100 
+      end
101 
+
102 
+      @client
103 
+    end
104 
+
105 
+    def receive(incoming_events)
106 
+      mqtt_client.connect do |c|
107 
+        incoming_events.each do |event|
108 
+          c.publish(options['topic'], payload)
109 
+        end
110 
+
111 
+        c.disconnect
112 
+      end
113 
+    end
114 
+
115 
+
116 
+    def check
117 
+      mqtt_client.connect do |c|
118 
+
119 
+        Timeout::timeout((options['max_read_time'].presence || 15).to_i) {
120 
+          c.get(options['topic']) do |topic, message|
121 
+
122 
+            # A lot of services generate JSON. Try that first
123 
+            payload = JSON.parse(message) rescue message
124 
+
125 
+            create_event :payload => {
126 
+              'topic' => topic,
127 
+              'message' => payload,
128 
+              'time' => Time.now.to_i
129 
+            }
130 
+          end
131 
+        } rescue TimeoutError
132 
+
133 
+        c.disconnect
134 
+      end
135 
+    end
136 
+
137 
+  end
138 
+end

+ 52 - 0
spec/models/agents/mqtt_agent_spec.rb
View File 

@@ -0,0 +1,52 @@
1 
+require 'spec_helper'
2 
+require 'mqtt'
3 
+require './spec/support/fake_mqtt_server'
4 
+
5 
+describe Agents::MqttAgent do
6 
+
7 
+  before :each do
8 
+    @error_log = StringIO.new
9 
+
10 
+    @server = MQTT::FakeServer.new(41234, '127.0.0.1')
11 
+    @server.just_one = true
12 
+    @server.logger = Logger.new(@error_log)
13 
+    @server.logger.level = Logger::DEBUG
14 
+    @server.start
15 
+
16 
+    @valid_params = {
17 
+      'uri' => "mqtt://#{@server.address}:#{@server.port}",
18 
+      'topic' => '/#',
19 
+      'max_read_time' => '1',
20 
+      'expected_update_period_in_days' => "2"
21 
+    }
22 
+
23 
+    @checker = Agents::MqttAgent.new(
24 
+      :name => "somename",
25 
+      :options => @valid_params,
26 
+      :schedule => "midnight",
27 
+    )
28 
+    @checker.user = users(:jane)
29 
+    @checker.save!
30 
+  end
31 
+
32 
+  after :each do
33 
+    @server.stop
34 
+  end
35 
+
36 
+  describe "#check" do
37 
+    it "should check that initial run creates an event" do
38 
+      expect { @checker.check }.to change { Event.count }.by(2)
39 
+    end
40 
+  end
41 
+
42 
+  describe "#working?" do
43 
+    it "checks if its generating events as scheduled" do
44 
+      @checker.should_not be_working
45 
+      @checker.check
46 
+      @checker.reload.should be_working
47 
+      three_days_from_now = 3.days.from_now
48 
+      stub(Time).now { three_days_from_now }
49 
+      @checker.should_not be_working
50 
+    end
51 
+  end
52 
+end

+ 137 - 0
spec/support/fake_mqtt_server.rb
View File 

@@ -0,0 +1,137 @@
1 
+#!/usr/bin/env ruby
2 
+#
3 
+# This is a 'fake' MQTT server to help with testing client implementations
4 
+#
5 
+# See https://github.com/njh/ruby-mqtt/blob/master/spec/fake_server.rb
6 
+#
7 
+# It behaves in the following ways:
8 
+#   * Responses to CONNECT with a successful CONACK
9 
+#   * Responses to PUBLISH by echoing the packet back
10 
+#   * Responses to SUBSCRIBE with SUBACK and a PUBLISH to the topic
11 
+#   * Responses to PINGREQ with PINGRESP
12 
+#   * Responses to DISCONNECT by closing the socket
13 
+#
14 
+# It has the following restrictions
15 
+#   * Doesn't deal with timeouts
16 
+#   * Only handles a single connection at a time
17 
+#
18 
+
19 
+$:.unshift File.dirname(__FILE__)+'/../lib'
20 
+
21 
+require 'logger'
22 
+require 'socket'
23 
+require 'mqtt'
24 
+
25 
+
26 
+class MQTT::FakeServer
27 
+  attr_reader :address, :port
28 
+  attr_reader :last_publish
29 
+  attr_reader :thread
30 
+  attr_reader :pings_received
31 
+  attr_accessor :just_one
32 
+  attr_accessor :logger
33 
+
34 
+  # Create a new fake MQTT server
35 
+  #
36 
+  # If no port is given, bind to a random port number
37 
+  # If no bind address is given, bind to localhost
38 
+  def initialize(port=nil, bind_address='127.0.0.1')
39 
+    @port = port
40 
+    @address = bind_address
41 
+  end
42 
+
43 
+  # Get the logger used by the server
44 
+  def logger
45 
+    @logger ||= Logger.new(STDOUT)
46 
+  end
47 
+
48 
+  # Start the thread and open the socket that will process client connections
49 
+  def start
50 
+    @socket ||= TCPServer.new(@address, @port)
51 
+    @address = @socket.addr[3]
52 
+    @port = @socket.addr[1]
53 
+    @thread ||= Thread.new do
54 
+      logger.info "Started a fake MQTT server on #{@address}:#{@port}"
55 
+      loop do
56 
+        # Wait for a client to connect
57 
+        client = @socket.accept
58 
+        @pings_received = 0
59 
+        handle_client(client)
60 
+        break if just_one
61 
+      end
62 
+    end
63 
+  end
64 
+
65 
+  # Stop the thread and close the socket
66 
+  def stop
67 
+    logger.info "Stopping fake MQTT server"
68 
+    @socket.close unless @socket.nil?
69 
+    @socket = nil
70 
+
71 
+    @thread.kill if @thread and @thread.alive?
72 
+    @thread = nil
73 
+  end
74 
+
75 
+  # Start the server thread and wait for it to finish (possibly never)
76 
+  def run
77 
+    start
78 
+    begin
79 
+      @thread.join
80 
+    rescue Interrupt
81 
+      stop
82 
+    end
83 
+  end
84 
+
85 
+
86 
+  protected
87 
+
88 
+  # Given a client socket, process MQTT packets from the client
89 
+  def handle_client(client)
90 
+    loop do
91 
+      packet = MQTT::Packet.read(client)
92 
+      logger.debug packet.inspect
93 
+
94 
+      case packet
95 
+        when MQTT::Packet::Connect
96 
+          client.write MQTT::Packet::Connack.new(:return_code => 0)
97 
+        when MQTT::Packet::Publish
98 
+          client.write packet
99 
+          @last_publish = packet
100 
+        when MQTT::Packet::Subscribe
101 
+          client.write MQTT::Packet::Suback.new(
102 
+            :message_id => packet.message_id,
103 
+            :granted_qos => 0
104 
+          )
105 
+          topic = packet.topics[0][0]
106 
+          client.write MQTT::Packet::Publish.new(
107 
+            :topic => topic,
108 
+            :payload => "hello #{topic}",
109 
+            :retain => true
110 
+          )
111 
+          client.write MQTT::Packet::Publish.new(
112 
+            :topic => topic,
113 
+            :payload => "did you know about #{topic}",
114 
+            :retain => true
115 
+          )
116 
+
117 
+        when MQTT::Packet::Pingreq
118 
+          client.write MQTT::Packet::Pingresp.new
119 
+          @pings_received += 1
120 
+        when MQTT::Packet::Disconnect
121 
+          client.close
122 
+        break
123 
+      end
124 
+    end
125 
+
126 
+    rescue MQTT::ProtocolException => e
127 
+      logger.warn "Protocol error, closing connection: #{e}"
128 
+      client.close
129 
+  end
130 
+
131 
+end
132 
+
133 
+if __FILE__ == $0
134 
+  server = MQTT::FakeServer.new(MQTT::DEFAULT_PORT)
135 
+  server.logger.level = Logger::DEBUG
136 
+  server.run
137 
+end