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Implement dropbox directory diff. Very naive.

Guilherme J. Tramontina 10 ans auparavant
Parent
74fa4e2308
Commettre
9dea1fb864
2 fichiers modifiés avec 76 ajouts et 0 suppressions
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  1. 30 0
      app/models/agents/dropbox_watch_agent.rb
  2. 46 0
      spec/models/agents/dropbox_watch_agent_spec.rb

+ 30 - 0
app/models/agents/dropbox_watch_agent.rb
Voir le fichier 

@@ -72,6 +72,36 @@ module Agents
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     class DropboxDirDiff
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       def initialize(previous, current)
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+        @previous, @current = [previous, current]
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+      end
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+
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+      def empty?
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+        (@previous == @current)
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+      end
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+
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+      def to_hash
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+        calculate_diff
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+        { added: @added, removed: @removed, updated: @updated }
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+      end
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+
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+      private
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+
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+      def calculate_diff
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+        @updated = @current.select do |current_entry|
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+          previous_entry = find_by_path(@previous, current_entry[:path])
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+          (current_entry != previous_entry) && !previous_entry.nil?
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+        end
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+
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+        updated_entries = @updated + @previous.select do |previous_entry|
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+          find_by_path(@updated, previous_entry[:path])
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+        end
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+
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+        @added = @current - @previous - updated_entries
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+        @removed = @previous - @current - updated_entries
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+      end
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+
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+      def find_by_path(array, path)
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+        array.find { |entry| entry[:path] == path }
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       end
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     end
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+ 46 - 0
spec/models/agents/dropbox_watch_agent_spec.rb
Voir le fichier 

@@ -110,4 +110,50 @@ describe Agents::DropboxWatchAgent do
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     end
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   end
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+  describe Agents::DropboxWatchAgent::DropboxDirDiff do
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+
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+    let(:previous) { [
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+      { path: '1.json', rev: '1' },
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+      { path: '2.json', rev: '1' },
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+      { path: '3.json', rev: '1' }
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+    ] }
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+
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+    let(:current) { [
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+      { path: '1.json', rev: '2' },
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+      { path: '3.json', rev: '1' },
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+      { path: '4.json', rev: '1' }
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+    ] }
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+
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+    describe '#empty?' do
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+
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+      it 'is true when no differences are detected' do
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+        diff = Agents::DropboxWatchAgent::DropboxDirDiff.new(previous, previous)
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+        expect(diff.empty?).to eq true
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+      end
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+
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+      it 'is false when differences were detected' do
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+        diff = Agents::DropboxWatchAgent::DropboxDirDiff.new(previous, current)
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+        expect(diff.empty?).to eq false
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+      end
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+
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+    end
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+
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+    describe '#to_hash' do
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+
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+      subject(:diff_hash) { Agents::DropboxWatchAgent::DropboxDirDiff.new(previous, current).to_hash }
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+
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+      it 'detects additions' do
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+        expect(diff_hash[:added]).to eq [{ path: '4.json', rev: '1' }]
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+      end
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+
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+      it 'detects removals' do
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+        expect(diff_hash[:removed]).to eq [ { path: '2.json', rev: '1' } ]
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+      end
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+
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+      it 'detects updates' do
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+        expect(diff_hash[:updated]).to eq [ { path: '1.json', rev: '2' } ]
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+      end
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+
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+    end
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+  end
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 end