Wire in MetricsReporter to FrontendServlet

This work is identical to the work done for BackendServlet in
[]

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132100448

java/google/registry/module/frontend/BUILD

@@ -20,6 +20,8 @@ java_library(
         "//java/google/registry/config",
         "//java/google/registry/flows",
         "//java/google/registry/keyring/api",
+        "//java/google/registry/monitoring/metrics",
+        "//java/google/registry/monitoring/whitebox",
         "//java/google/registry/rdap",
         "//java/google/registry/request",
         "//java/google/registry/request:modules",

java/google/registry/module/frontend/FrontendComponent.java

@@ -19,6 +19,13 @@ import google.registry.braintree.BraintreeModule;
 import google.registry.config.ConfigModule;
 import google.registry.keyring.api.KeyModule;
 import google.registry.keyring.api.VoidKeyringModule;
+import google.registry.monitoring.metrics.MetricReporter;
+import google.registry.monitoring.whitebox.StackdriverModule;
+import google.registry.request.Modules.AppIdentityCredentialModule;
+import google.registry.request.Modules.Jackson2Module;
+import google.registry.request.Modules.ModulesServiceModule;
+import google.registry.request.Modules.UrlFetchTransportModule;
+import google.registry.request.Modules.UseAppIdentityCredentialForGoogleApisModule;
 import google.registry.request.Modules.UserServiceModule;
 import google.registry.request.RequestModule;
 import google.registry.ui.ConsoleConfigModule;
@@ -29,14 +36,22 @@ import javax.inject.Singleton;
 @Singleton
 @Component(
     modules = {
+        AppIdentityCredentialModule.class,
         BraintreeModule.class,
         ConfigModule.class,
         ConsoleConfigModule.class,
+        FrontendMetricsModule.class,
+        Jackson2Module.class,
         KeyModule.class,
+        ModulesServiceModule.class,
+        StackdriverModule.class,
         SystemClockModule.class,
+        UrlFetchTransportModule.class,
+        UseAppIdentityCredentialForGoogleApisModule.class,
         UserServiceModule.class,
         VoidKeyringModule.class,
     })
 interface FrontendComponent {
   FrontendRequestComponent startRequest(RequestModule requestModule);
+  MetricReporter metricReporter();
 }

java/google/registry/module/frontend/FrontendMetricsModule.java

@@ -0,0 +1,25 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.module.frontend;
+
+import dagger.Module;
+import javax.inject.Singleton;
+
+/**
+ * Dagger module for injecting metrics. All metrics should have {@link Singleton} scope to avoid
+ * being recreated per-request, as the metrics generally track cumulative values.
+ */
+@Module
+public class FrontendMetricsModule {}

java/google/registry/module/frontend/FrontendServlet.java

@@ -18,11 +18,15 @@ import static java.util.Arrays.asList;
 
 import com.google.common.base.Function;
 import com.google.common.collect.FluentIterable;
+import google.registry.monitoring.metrics.MetricReporter;
 import google.registry.request.RequestHandler;
 import google.registry.request.RequestModule;
+import google.registry.util.FormattingLogger;
 import java.io.IOException;
 import java.lang.reflect.Method;
 import java.security.Security;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -32,6 +36,8 @@ import org.bouncycastle.jce.provider.BouncyCastleProvider;
 public final class FrontendServlet extends HttpServlet {
 
   private static final FrontendComponent component = DaggerFrontendComponent.create();
+  private static final MetricReporter metricReporter = component.metricReporter();
+  private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
 
   private static final RequestHandler<FrontendRequestComponent> requestHandler =
       RequestHandler.create(FrontendRequestComponent.class, FluentIterable
@@ -46,6 +52,23 @@ public final class FrontendServlet extends HttpServlet {
   @Override
   public void init() {
     Security.addProvider(new BouncyCastleProvider());
+
+    try {
+      metricReporter.startAsync().awaitRunning(10, TimeUnit.SECONDS);
+      logger.info("Started up MetricReporter");
+    } catch (TimeoutException timeoutException) {
+      logger.severefmt("Failed to initialize MetricReporter: %s", timeoutException);
+    }
+  }
+
+  @Override
+  public void destroy() {
+    try {
+      metricReporter.stopAsync().awaitTerminated(10, TimeUnit.SECONDS);
+      logger.info("Shut down MetricReporter");
+    } catch (TimeoutException timeoutException) {
+      logger.severefmt("Failed to stop MetricReporter: %s", timeoutException);
+    }
   }
 
   @Override

javatests/google/registry/module/frontend/BUILD

@@ -20,6 +20,7 @@ java_library(
         "//third_party/java/servlet/servlet_api",
         "//third_party/java/truth",
         "//java/google/registry/module/frontend",
+        "//javatests/google/registry/testing",
     ],
 )
 

javatests/google/registry/module/frontend/FrontendServletTest.java

@@ -18,8 +18,10 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import google.registry.testing.AppEngineRule;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -28,6 +30,10 @@ import org.junit.runners.JUnit4;
 @RunWith(JUnit4.class)
 public class FrontendServletTest {
 
+  @Rule
+  public final AppEngineRule appEngine =
+      AppEngineRule.builder().withDatastore().withLocalModules().build();
+
   private final HttpServletRequest req = mock(HttpServletRequest.class);
   private final HttpServletResponse rsp = mock(HttpServletResponse.class);