Add Flogger to GCP proxy

This adds a dummy flogger logging statement in the GCP proxy to ensure that it
works.

TESTED=Deployed to alpha and verified that flogger works. Also passed FOSS
tests.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=196899036

java/google/registry/proxy/BUILD

@@ -31,6 +31,7 @@ java_library(
         "@com_google_auto_value",
         "@com_google_code_findbugs_jsr305",
         "@com_google_dagger",
+        "@com_google_flogger",
         "@com_google_guava",
         "@com_google_monitoring_client_metrics",
         "@com_google_monitoring_client_stackdriver",

java/google/registry/proxy/ProxyServer.java

@@ -19,6 +19,7 @@ import static google.registry.proxy.handler.RelayHandler.RELAY_CHANNEL_KEY;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.flogger.FluentLogger;
 import com.google.monitoring.metrics.MetricReporter;
 import google.registry.proxy.Protocol.BackendProtocol;
 import google.registry.proxy.Protocol.FrontendProtocol;
@@ -51,6 +52,8 @@ import javax.inject.Provider;
 public class ProxyServer implements Runnable {
 
   private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
+  // TODO (b/78466557): remove dummy flogger.
+  private static final FluentLogger flogger = FluentLogger.forEnclosingClass();
 
   /** Maximum length of the queue of incoming connections. */
   private static final int MAX_SOCKET_BACKLOG = 128;
@@ -170,7 +173,7 @@ public class ProxyServer implements Runnable {
               // Wait for binding to be established for each listening port.
               ChannelFuture serverChannelFuture = serverBootstrap.bind(port).sync();
               if (serverChannelFuture.isSuccess()) {
-                logger.infofmt(
+                flogger.atInfo().log(
                     "Start listening on port %s for %s protocol.", port, protocol.name());
                 Channel serverChannel = serverChannelFuture.channel();
                 serverChannel.attr(PROTOCOL_KEY).set(protocol);

java/google/registry/repositories.bzl

@@ -67,6 +67,7 @@ def domain_registry_repositories(
     omit_com_google_dagger_producers=False,
     omit_com_google_errorprone_error_prone_annotations=False,
     omit_com_google_errorprone_javac_shaded=False,
+    omit_com_google_flogger=False,
     omit_com_google_gdata_core=False,
     omit_com_google_googlejavaformat_google_java_format=False,
     omit_com_google_guava=False,
@@ -249,6 +250,8 @@ def domain_registry_repositories(
     com_google_errorprone_error_prone_annotations()
   if not omit_com_google_errorprone_javac_shaded:
     com_google_errorprone_javac_shaded()
+  if not omit_com_google_flogger:
+    com_google_flogger()
   if not omit_com_google_gdata_core:
     com_google_gdata_core()
   if not omit_com_google_googlejavaformat_google_java_format:
@@ -1253,6 +1256,18 @@ def com_google_errorprone_javac_shaded():
       ],
   )
 
+def com_google_flogger():
+  java_import_external(
+      name = "com_google_flogger",
+      licenses = ["notice"],  # Apache 2.0
+      jar_sha256 = "82f6d7fcafe92adabbb3e0ccc82c2b3a40c5c72343fe2a3226b34f8fa0f61bcb",
+      jar_urls = [
+          "http://repo1.maven.org/maven2/com/google/flogger/flogger/0.1/flogger-0.1.jar",
+          "http://maven.ibiblio.org/maven2/com/google/flogger/flogger/0.1/flogger-0.1.jar",
+      ],
+      deps = ["@com_google_code_findbugs_jsr305"],
+)
+
 def com_google_gdata_core():
   java_import_external(
       name = "com_google_gdata_core",