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Send events when the Dropbox Watch Agent detects any difference on the directory listing provided by the Dropbox API.

Guilherme J. Tramontina 11 年之前
父节点
32b5650ece
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74fa4e2308
共有 2 个文件被更改，包括 91 次插入 和 1 次删除
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  1. 31 0
      app/models/agents/dropbox_watch_agent.rb
  2. 60 1
      spec/models/agents/dropbox_watch_agent_spec.rb

+ 31 - 0
app/models/agents/dropbox_watch_agent.rb
查看文件 

@@ -37,6 +37,16 @@ module Agents
37 37 
       event_created_within?(interpolated[:expected_update_period_in_days]) && !received_event_without_error?
38 38 
     end
39 39
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+    def check
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+      api = DropboxAPI.new(interpolated[:access_token])
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+      current_contents = api.dir(interpolated[:dir_to_watch])
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+
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+      diff = DropboxDirDiff.new(previous_contents, current_contents)
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+      create_event(payload: diff.to_hash) unless previous_contents.nil? || diff.empty?
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+
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+      remember(current_contents)
48 
+    end
49 
+
40 50 
     private
41 51
42 52 
     def is_positive_integer?(value)
 
@@ -45,5 +55,26 @@ module Agents
45 55 
       false
46 56 
     end
47 57
58 
+    def previous_contents
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+      self.memory['contents']
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+    end
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+
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+    def remember(contents)
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+      self.memory['contents'] = contents
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+    end
65 
+
66 
+    # == Auxiliary classes ==
67 
+
68 
+    class DropboxAPI
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+      def initialize(access_token)
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+      end
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+    end
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+
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+    class DropboxDirDiff
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+      def initialize(previous, current)
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+      end
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+    end
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+
48 78 
   end
79 
+
49 80 
 end

+ 60 - 1
spec/models/agents/dropbox_watch_agent_spec.rb
查看文件 

@@ -11,6 +11,7 @@ describe Agents::DropboxWatchAgent do
11 11 
       }
12 12 
     )
13 13 
     @agent.user = users(:bob)
14 
+    @agent.save!
14 15 
   end
15 16
16 17 
   it 'cannot receive events' do
 
@@ -26,7 +27,7 @@ describe Agents::DropboxWatchAgent do
26 27 
   end
27 28
28 29 
   describe '#valid?' do
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-    before { expect(@agent.valid?).to eq true }
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+    before(:each) { expect(@agent.valid?).to eq true }
30 31
31 32 
     it 'requires the "access_token"' do
32 33 
       @agent.options[:access_token] = nil
 
@@ -51,4 +52,62 @@ describe Agents::DropboxWatchAgent do
51 52 
     end
52 53 
   end
53 54
55 
+  describe '#check' do
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+
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+    let(:first_result) { 'first_result' }
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+
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+    before(:each) do
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+      stub.proxy(Agents::DropboxWatchAgent::DropboxAPI).new('70k3n') do |api|
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+        stub(api).dir('/my/dropbox/dir') { first_result }
62 
+      end
63 
+    end
64 
+
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+    it 'saves the directory listing in its memory' do
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+      @agent.check
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+      expect(@agent.memory).to eq 'contents' => first_result
68 
+    end
69 
+
70 
+    context 'first time' do
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+
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+      before(:each) { @agent.memory = {} }
73 
+
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+      it 'does not send any events' do
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+        expect { @agent.check }.to_not change(Event, :count)
76 
+      end
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+
78 
+    end
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+
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+    context 'subsequent calls' do
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+
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+      let(:second_result) { 'second_result' }
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+
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+      before(:each) do
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+        @agent.memory = { 'contents' => 'not_empty' }
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+
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+        stub.proxy(Agents::DropboxWatchAgent::DropboxAPI).new('70k3n') do |api|
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+          stub(api).dir('/my/dropbox/dir') { second_result }
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+        end
90 
+      end
91 
+
92 
+      it 'sends an event upon a different directory listing' do
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+        payload = { 'diff' => 'object as hash' }
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+        stub.proxy(Agents::DropboxWatchAgent::DropboxDirDiff).new(@agent.memory['contents'], second_result) do |diff|
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+          stub(diff).empty? { false }
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+          stub(diff).to_hash { payload }
97 
+        end
98 
+        expect { @agent.check }.to change(Event, :count).by(1)
99 
+        expect(Event.last.payload).to eq(payload)
100 
+      end
101 
+
102 
+      it 'does not sent any events when there is no difference on the directory listing' do
103 
+        stub.proxy(Agents::DropboxWatchAgent::DropboxDirDiff).new(@agent.memory['contents'], second_result) do |diff|
104 
+          stub(diff).empty? { true }
105 
+        end
106 
+
107 
+        expect { @agent.check }.to_not change(Event, :count)
108 
+      end
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+
110 
+    end
111 
+  end
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+
54 113 
 end