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Add ChangeDetectorAgent, test

New agent will watch the property of an inbound event stream. When that
property changes, it will emit the inbound event.

Michael Cramm 11 年之前
父节点
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当前提交
22bee753cd
共有 2 个文件被更改，包括 175 次插入 和 0 次删除
显示文件统计
  1. 76 0
      app/models/agents/change_detector_agent.rb
  2. 99 0
      spec/models/agents/change_detector_agent_spec.rb

+ 76 - 0
app/models/agents/change_detector_agent.rb
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+module Agents
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+  class ChangeDetectorAgent < Agent
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+    cannot_be_scheduled!
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+
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+    description <<-MD
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+      The ChangeDetectorAgent receives a stream of events and emits a new event when a property of the received event changes.
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+
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+      `property` specifies the property to be watched.
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+
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+      `expected_update_period_in_days` is used to determine if the Agent is working.
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+
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+      The resulting event will be a copy of the received event.
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+    MD
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+
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+    event_description <<-MD
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+    This will change based on the source event. If you were event from the ShellCommandAgent, your outbound event might look like:
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+
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+      {
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+        'command' => 'pwd',
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+        'path' => '/home/Huginn',
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+        'exit_status' => '0',
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+        'errors' => '',
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+        'output' => '/home/Huginn'
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+      }
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+    MD
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+
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+    def default_options
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+      {
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+          'property' => 'output',
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+          'expected_update_period_in_days' => 1
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+      }
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+    end
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+
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+    def validate_options
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+      unless options['property'].present? && options['expected_update_period_in_days'].present?
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+        errors.add(:base, "The property and expected_update_period_in_days fields are all required.")
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+      end
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+    end
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+
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+    def working?
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+      event_created_within?(interpolated['expected_update_period_in_days']) && !recent_error_logs?
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+    end
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+
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+    def receive(incoming_events)
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+      incoming_events.each do |event|
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+        handle(interpolated(event), event)
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+      end
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+    end
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+
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+    private
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+
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+    def handle(opts, event = nil)
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+      property = opts['property']
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+      if has_changed?(property)
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+        created_event = create_event :payload => event.payload
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+
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+        log("Propagating new event as property has changed to #{property} from #{last_property}", :outbound_event => created_event, :inbound_event => event )
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+        update_memory(property)
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+      else
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+        log("Not propagating as incoming event has not changed from #{last_property}.", :inbound_event => event )
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+      end
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+    end
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+
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+    def has_changed?(property)
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+      property != last_property
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+    end
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+
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+    def last_property
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+      self.memory['last_property']
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+    end
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+
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+    def update_memory(property)
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+      self.memory['last_property'] = property
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+    end
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+  end
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+end

+ 99 - 0
spec/models/agents/change_detector_agent_spec.rb
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+require 'spec_helper'
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+
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+describe Agents::ChangeDetectorAgent do
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+  def create_event(output=nil)
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+    event = Event.new
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+    event.agent = agents(:jane_weather_agent)
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+    event.payload = {
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+      :command => 'some-command',
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+      :output => output
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+    }
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+    event.save!
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+
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+    event
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+  end
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+
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+  before do
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+    @valid_params = {
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+        :property  => "{{output}}",
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+        :expected_update_period_in_days => "1",
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+      }
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+
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+    @checker = Agents::ChangeDetectorAgent.new(:name => "somename", :options => @valid_params)
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+    @checker.user = users(:jane)
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+    @checker.save!
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+  end
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+
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+  describe "validation" do
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+    before do
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+      @checker.should be_valid
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+    end
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+
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+    it "should validate presence of property" do
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+      @checker.options[:property] = nil
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+      @checker.should_not be_valid
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+    end
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+
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+    it "should validate presence of property" do
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+      @checker.options[:expected_update_period_in_days] = nil
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+      @checker.should_not be_valid
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+    end
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+  end
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+
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+  describe "#working?" do
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+    before :each do
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+      # Need to create an event otherwise event_created_within? returns nil
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+      event = create_event
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+      @checker.receive([event])
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+    end
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+
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+    it "is when event created within :expected_update_period_in_days" do
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+      @checker.options[:expected_update_period_in_days] = 2
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+      three_days_from_now = 1.days.from_now
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+      @checker.should be_working
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+    end
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+
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+    it "isnt when event created outside :expected_update_period_in_days" do
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+      @checker.options[:expected_update_period_in_days] = 2
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+      three_days_from_now = 2.days.from_now
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+      stub(Time).now { three_days_from_now }
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+
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+      @checker.should_not be_working
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+    end
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+  end
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+
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+  describe "#receive" do
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+    before :each do
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+      @event = create_event("2014-07-01")
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+    end
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+
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+    it "creates events when memory is empty" do
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+      @event.payload[:output] = "2014-07-01"
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+      expect {
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+        @checker.receive([@event])
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+      }.to change(Event, :count).by(1)
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+      Event.last.payload[:command].should == @event.payload[:command]
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+      Event.last.payload[:output].should == @event.payload[:output]
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+    end
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+
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+    it "creates events when new event changed" do
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+      @event.payload[:output] = "2014-07-01"
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+      @checker.receive([@event])
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+
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+      event = create_event("2014-08-01")
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+
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+      expect {
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+        @checker.receive([event])
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+      }.to change(Event, :count).by(1)
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+    end
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+
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+    it "does not create event when no change" do
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+      @event.payload[:output] = "2014-07-01"
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+      @checker.receive([@event])
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+
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+      expect {
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+        @checker.receive([@event])
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+      }.to change(Event, :count).by(0)
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+    end
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+  end
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+end