Rename ConnectionRackMiddleware to RequestsRackMiddleware.

+ fix tests after metrics rename

config/initializers/8_metrics.rb

@@ -123,7 +123,7 @@ Gitlab::Metrics::UnicornSampler.initialize_instance(Settings.monitoring.unicorn_
 
 Gitlab::Application.configure do |config|
   # 0 should be Sentry to catch errors in this middleware
-  config.middleware.insert(1, Gitlab::Metrics::ConnectionRackMiddleware)
+  config.middleware.insert(1, Gitlab::Metrics::RequestsRackMiddleware)
 end
 
 if Gitlab::Metrics.enabled?

lib/gitlab/metrics/connection_rack_middleware.rb → lib/gitlab/metrics/requests_rack_middleware.rb

 module Gitlab
   module Metrics
-    class ConnectionRackMiddleware
+    class RequestsRackMiddleware
       def initialize(app)
         @app = app
       end
 
-      def self.rack_request_count
-        @rack_request_count ||= Gitlab::Metrics.counter(:http_requests_total, 'Rack request count')
+      def self.http_request_total
+        @http_request_total ||= Gitlab::Metrics.counter(:http_requests_total, 'Request count')
       end
 
       def self.rack_uncaught_errors_count
-        @rack_uncaught_errors_count ||= Gitlab::Metrics.counter(:rack_uncaught_errors_total, 'Rack connections handling uncaught errors count')
+        @rack_uncaught_errors_count ||= Gitlab::Metrics.counter(:rack_uncaught_errors_total, 'Request handling uncaught errors count')
       end
 
-      def self.rack_execution_time
-        @rack_execution_time ||= Gitlab::Metrics.histogram(:http_request_duration_seconds, 'Rack connection handling execution time',
-                                                           {}, [0.05, 0.1, 0.25, 0.5, 0.7, 1, 1.5, 2, 2.5, 3, 5, 7, 10])
+      def self.http_request_duration_seconds
+        @http_request_duration_seconds ||= Gitlab::Metrics.histogram(:http_request_duration_seconds, 'Request handling execution time',
+                                                           {}, [0.05, 0.1, 0.25, 0.5, 0.7, 1, 2.5, 5, 10, 25])
       end
 
       def call(env)
         method = env['REQUEST_METHOD'].downcase
         started = Time.now.to_f
         begin
-          ConnectionRackMiddleware.rack_request_count.increment(method: method)
+          RequestsRackMiddleware.http_request_total.increment(method: method)
 
           status, headers, body = @app.call(env)
 
+          elapsed = Time.now.to_f - started
+          RequestsRackMiddleware.http_request_duration_seconds.observe({ method: method, status: status }, elapsed)
+
           [status, headers, body]
         rescue
-          ConnectionRackMiddleware.rack_uncaught_errors_count.increment
+          RequestsRackMiddleware.rack_uncaught_errors_count.increment
           raise
-        ensure
-          elapsed = Time.now.to_f - started
-          ConnectionRackMiddleware.rack_execution_time.observe({method: method, status: status}, elapsed)
         end
       end
     end

spec/lib/gitlab/metrics/connection_rack_middleware_spec.rb → spec/lib/gitlab/metrics/requests_rack_middleware_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Metrics::ConnectionRackMiddleware do
+describe Gitlab::Metrics::RequestsRackMiddleware do
   let(:app) { double('app') }
   subject { described_class.new(app) }
 
@@ -23,7 +23,7 @@ describe Gitlab::Metrics::ConnectionRackMiddleware do
       end
 
       it 'increments requests count' do
-        expect(described_class).to receive_message_chain(:rack_request_count, :increment).with(method: 'get')
+        expect(described_class).to receive_message_chain(:http_request_total, :increment).with(method: 'get')
 
         subject.call(env)
       end
@@ -32,16 +32,22 @@ describe Gitlab::Metrics::ConnectionRackMiddleware do
         execution_time = 10
         allow(app).to receive(:call) do |*args|
           Timecop.freeze(execution_time.seconds)
+          [200, nil, nil]
         end
 
-        expect(described_class).to receive_message_chain(:rack_execution_time, :observe).with({status: 200, method: 'get'}, execution_time)
+        expect(described_class).to receive_message_chain(:http_request_duration_seconds, :observe).with({ status: 200, method: 'get' }, execution_time)
 
         subject.call(env)
       end
     end
 
     context '@app.call throws exception' do
-      let(:rack_response_count) { double('rack_response_count') }
+      let(:http_request_duration_seconds) { double('http_request_duration_seconds') }
+
+      before do
+        allow(app).to receive(:call).and_raise(StandardError)
+        allow(described_class).to receive(:http_request_duration_seconds).and_return(http_request_duration_seconds)
+      end
 
       it 'increments exceptions count' do
         expect(described_class).to receive_message_chain(:rack_uncaught_errors_count, :increment)
@@ -50,25 +56,13 @@ describe Gitlab::Metrics::ConnectionRackMiddleware do
       end
 
       it 'increments requests count' do
-        expect(described_class).to receive_message_chain(:rack_request_count, :increment).with(method: 'get')
-
-        expect { subject.call(env) }.to raise_error(StandardError)
-      end
-
-      it "does't increment response count" do
-        expect(described_class.rack_response_count).not_to receive(:increment)
+        expect(described_class).to receive_message_chain(:http_request_total, :increment).with(method: 'get')
 
         expect { subject.call(env) }.to raise_error(StandardError)
       end
 
-      it 'measures execution time' do
-        execution_time = 10
-        allow(app).to receive(:call) do |*args|
-          Timecop.freeze(execution_time.seconds)
-          raise StandardError
-        end
-
-        expect(described_class).to receive_message_chain(:rack_execution_time, :observe).with({}, execution_time)
+      it "does't measure request execution time" do
+        expect(described_class.http_request_duration_seconds).not_to receive(:increment)
 
         expect { subject.call(env) }.to raise_error(StandardError)
       end