Add extension point to register JGit PostUploadHooks

Plugins may register PostUploadHook instances in order to get notified
after JGit is done uploading a pack.

Now that PostUploadHook can be registered using the DynamicSet, use that
mechanism to register UploadPackMetricsHook.

Change-Id: If848bddc85ca8923a5d55f7dd448ac218c910e1c

Documentation/dev-plugins.txt

@@ -498,6 +498,12 @@ notified when JGit is about to upload a pack. This may be useful
 for those plugins which would like to monitor usage in Git
 repositories.
 
+[[post-upload-hook]]
+== Post Upload-Pack Hooks
+
+Plugins may register PostUploadHook instances in order to get notified after
+JGit is done uploading a pack.
+
 [[ssh]]
 == SSH Commands
 

gerrit-httpd/src/main/java/com/google/gerrit/httpd/GitOverHttpServlet.java

@@ -31,7 +31,6 @@ import com.google.gerrit.server.git.ReceiveCommits;
 import com.google.gerrit.server.git.SearchingChangeCacheImpl;
 import com.google.gerrit.server.git.TagCache;
 import com.google.gerrit.server.git.TransferConfig;
-import com.google.gerrit.server.git.UploadPackMetricsHook;
 import com.google.gerrit.server.git.VisibleRefFilter;
 import com.google.gerrit.server.git.validators.UploadValidators;
 import com.google.gerrit.server.notedb.ChangeNotes;
@@ -51,6 +50,8 @@ import org.eclipse.jgit.http.server.ServletUtils;
 import org.eclipse.jgit.http.server.resolver.AsIsFileService;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.transport.PostUploadHook;
+import org.eclipse.jgit.transport.PostUploadHookChain;
 import org.eclipse.jgit.transport.PreUploadHook;
 import org.eclipse.jgit.transport.PreUploadHookChain;
 import org.eclipse.jgit.transport.ReceivePack;
@@ -198,16 +199,16 @@ public class GitOverHttpServlet extends GitServlet {
 
   static class UploadFactory implements UploadPackFactory<HttpServletRequest> {
     private final TransferConfig config;
-    private final UploadPackMetricsHook uploadMetrics;
     private final DynamicSet<PreUploadHook> preUploadHooks;
+    private final DynamicSet<PostUploadHook> postUploadHooks;
 
     @Inject
     UploadFactory(TransferConfig tc,
-        UploadPackMetricsHook uploadMetrics,
+        DynamicSet<PreUploadHook> preUploadHooks,
-        DynamicSet<PreUploadHook> preUploadHooks) {
+        DynamicSet<PostUploadHook> postUploadHooks) {
       this.config = tc;
-      this.uploadMetrics = uploadMetrics;
       this.preUploadHooks = preUploadHooks;
+      this.postUploadHooks = postUploadHooks;
     }
 
     @Override
@@ -217,7 +218,8 @@ public class GitOverHttpServlet extends GitServlet {
       up.setTimeout(config.getTimeout());
       up.setPreUploadHook(PreUploadHookChain.newChain(
           Lists.newArrayList(preUploadHooks)));
-      up.setPostUploadHook(uploadMetrics);
+      up.setPostUploadHook(
+          PostUploadHookChain.newChain(Lists.newArrayList(postUploadHooks)));
       return up;
     }
   }

gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java

@@ -173,6 +173,7 @@ import com.google.inject.internal.UniqueAnnotations;
 import org.apache.velocity.runtime.RuntimeInstance;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.transport.PostReceiveHook;
+import org.eclipse.jgit.transport.PostUploadHook;
 import org.eclipse.jgit.transport.PreUploadHook;
 
 import java.util.List;
@@ -314,6 +315,7 @@ public class GerritGlobalModule extends FactoryModule {
     DynamicSet.setOf(binder(), ReceivePackInitializer.class);
     DynamicSet.setOf(binder(), PostReceiveHook.class);
     DynamicSet.setOf(binder(), PreUploadHook.class);
+    DynamicSet.setOf(binder(), PostUploadHook.class);
     DynamicSet.setOf(binder(), ChangeIndexedListener.class);
     DynamicSet.setOf(binder(), NewProjectCreatedListener.class);
     DynamicSet.setOf(binder(), ProjectDeletedListener.class);

gerrit-server/src/main/java/com/google/gerrit/server/git/GitModule.java

@@ -15,6 +15,9 @@
 package com.google.gerrit.server.git;
 
 import com.google.gerrit.extensions.config.FactoryModule;
+import com.google.gerrit.extensions.registration.DynamicSet;
+
+import org.eclipse.jgit.transport.PostUploadHook;
 
 /** Configures the Git support. */
 public class GitModule extends FactoryModule {
@@ -24,5 +27,7 @@ public class GitModule extends FactoryModule {
     factory(MetaDataUpdate.InternalFactory.class);
     bind(MetaDataUpdate.Server.class);
     bind(ReceiveConfig.class);
+    DynamicSet.bind(binder(), PostUploadHook.class)
+        .to(UploadPackMetricsHook.class);
   }
 }

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/Upload.java

@@ -21,7 +21,6 @@ import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.git.SearchingChangeCacheImpl;
 import com.google.gerrit.server.git.TagCache;
 import com.google.gerrit.server.git.TransferConfig;
-import com.google.gerrit.server.git.UploadPackMetricsHook;
 import com.google.gerrit.server.git.VisibleRefFilter;
 import com.google.gerrit.server.git.validators.UploadValidationException;
 import com.google.gerrit.server.git.validators.UploadValidators;
@@ -30,6 +29,8 @@ import com.google.gerrit.sshd.AbstractGitCommand;
 import com.google.gerrit.sshd.SshSession;
 import com.google.inject.Inject;
 
+import org.eclipse.jgit.transport.PostUploadHook;
+import org.eclipse.jgit.transport.PostUploadHookChain;
 import org.eclipse.jgit.transport.PreUploadHook;
 import org.eclipse.jgit.transport.PreUploadHookChain;
 import org.eclipse.jgit.transport.UploadPack;
@@ -58,15 +59,15 @@ final class Upload extends AbstractGitCommand {
   @Inject
   private DynamicSet<PreUploadHook> preUploadHooks;
 
+  @Inject
+  private DynamicSet<PostUploadHook> postUploadHooks;
+
   @Inject
   private UploadValidators.Factory uploadValidatorsFactory;
 
   @Inject
   private SshSession session;
 
-  @Inject
-  private UploadPackMetricsHook uploadMetrics;
-
   @Override
   protected void runImpl() throws IOException, Failure {
     if (!projectControl.canRunUploadPack()) {
@@ -80,7 +81,8 @@ final class Upload extends AbstractGitCommand {
             true));
     up.setPackConfig(config.getPackConfig());
     up.setTimeout(config.getTimeout());
-    up.setPostUploadHook(uploadMetrics);
+    up.setPostUploadHook(
+        PostUploadHookChain.newChain(Lists.newArrayList(postUploadHooks)));
 
     List<PreUploadHook> allPreUploadHooks = Lists.newArrayList(preUploadHooks);
     allPreUploadHooks.add(uploadValidatorsFactory.create(project, repo,