feature: add channel for each queue for zabbix

https://jira.railsc.ru/browse/SG-5633

app/controllers/resque/queues/status_controller.rb

@@ -13,6 +13,8 @@ def show
             Resque.queues_info.threshold_size(params.fetch('queue'))
           when 'threshold_age'
             Resque.queues_info.threshold_age(params.fetch('queue'))
+          when 'channel'
+            Resque.queues_info.channel(params.fetch('queue'))
           else
             0
           end.to_s

lib/resque/integration/queues_info.rb

@@ -35,6 +35,10 @@ def threshold_age(queue)
         @config.max_age(queue)
       end
 
+      def channel(queue)
+        @config.channel(queue)
+      end
+
       def data
         @config.data
       end

lib/resque/integration/queues_info/config.rb

@@ -16,6 +16,10 @@ def max_size(queue)
           threshold(queue, 'max_size')
         end
 
+        def channel(queue)
+          Array.wrap((@queues[queue] || @defaults)['channel']).join(' ')
+        end
+
         def data
           @data ||= @queues.map do |k, v|
             {

spec/fixtures/resque_queues.yml

@@ -1,8 +1,13 @@
 defaults:
   max_age: 10
   max_size: 10
+  channel: default
 
 queues:
   first:
     max_age: 20
     max_size: 100
+    channel: first
+
+  second_queue:
+    channel: [first, second]

spec/resque/integration/queues_info_spec.rb

@@ -253,4 +253,30 @@
       end
     end
   end
+
+  describe '#channel' do
+    context 'when queue defined in config' do
+      context 'when returns the one channel' do
+        let(:queue_name) { 'first' }
+
+        it { expect(queue_info.channel(queue_name)).to eq 'first' }
+      end
+
+      context 'when returns several channels' do
+        let(:queue_name) { 'second_queue' }
+
+        it do
+          expect(queue_info.channel(queue_name)).to eq 'first second'
+        end
+      end
+    end
+
+    context 'when queue not defined in config' do
+      let(:queue_name) { 'other_queue' }
+
+      it 'returns channel' do
+        expect(queue_info.channel(queue_name)).to eq 'default'
+      end
+    end
+  end
 end