Fix server startup when replication.config exists

The addition of the per-request RefControl cache broke push
replication as the PushOp "request" could not locate a Guice
binding for the cache.

Use the same trick we do with MergeOp to setup a per-operation
"request" scope for Guice.

Change-Id: I0cecbad4809493f43cb2fec3624b1a53e38fb48f

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

@@ -22,16 +22,13 @@ import com.google.gerrit.reviewdb.Project;
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.RemotePeer;
-import com.google.gerrit.server.RequestCleanup;
 import com.google.gerrit.server.config.GerritRequestModule;
 import com.google.gerrit.server.ssh.SshInfo;
 import com.google.inject.AbstractModule;
 import com.google.inject.Inject;
 import com.google.inject.Injector;
-import com.google.inject.Key;
 import com.google.inject.OutOfScopeException;
 import com.google.inject.Provider;
-import com.google.inject.Scope;
 import com.google.inject.servlet.RequestScoped;
 
 import com.jcraft.jsch.HostKey;
@@ -65,7 +62,7 @@ public class ChangeMergeQueue implements MergeQueue {
     Injector child = parent.createChildInjector(new AbstractModule() {
       @Override
       protected void configure() {
-        bindScope(RequestScoped.class, MyScope.REQUEST);
+        bindScope(RequestScoped.class, PerThreadRequestScope.REQUEST);
         install(new GerritRequestModule());
 
         bind(CurrentUser.class).to(IdentifiedUser.class);
@@ -186,8 +183,8 @@ public class ChangeMergeQueue implements MergeQueue {
 
   private void mergeImpl(Branch.NameKey branch) {
     try {
-      MyScope ctx = new MyScope();
-      MyScope old = MyScope.set(ctx);
+      PerThreadRequestScope ctx = new PerThreadRequestScope();
+      PerThreadRequestScope old = PerThreadRequestScope.set(ctx);
       try {
         try {
           bgFactory.get().create(branch).merge();
@@ -195,7 +192,7 @@ public class ChangeMergeQueue implements MergeQueue {
           ctx.cleanup.run();
         }
       } finally {
-        MyScope.set(old);
+        PerThreadRequestScope.set(old);
       }
     } catch (Throwable e) {
       log.error("Merge attempt for " + branch + " failed", e);
@@ -261,65 +258,4 @@ public class ChangeMergeQueue implements MergeQueue {
       return "recheck " + project.get() + " " + dest.getShortName();
     }
   }
-
-  private static class MyScope {
-    private static final ThreadLocal<MyScope> current =
-        new ThreadLocal<MyScope>();
-
-    private static MyScope getContext() {
-      final MyScope ctx = current.get();
-      if (ctx == null) {
-        throw new OutOfScopeException("Not in command/request");
-      }
-      return ctx;
-    }
-
-    static MyScope set(MyScope ctx) {
-      MyScope old = current.get();
-      current.set(ctx);
-      return old;
-    }
-
-    static final Scope REQUEST = new Scope() {
-      public <T> Provider<T> scope(final Key<T> key, final Provider<T> creator) {
-        return new Provider<T>() {
-          public T get() {
-            return getContext().get(key, creator);
-          }
-
-          @Override
-          public String toString() {
-            return String.format("%s[%s]", creator, REQUEST);
-          }
-        };
-      }
-
-      @Override
-      public String toString() {
-        return "MergeQueue.REQUEST";
-      }
-    };
-
-    private static final Key<RequestCleanup> RC_KEY =
-        Key.get(RequestCleanup.class);
-
-    private final RequestCleanup cleanup;
-    private final Map<Key<?>, Object> map;
-
-    MyScope() {
-      cleanup = new RequestCleanup();
-      map = new HashMap<Key<?>, Object>();
-      map.put(RC_KEY, cleanup);
-    }
-
-    synchronized <T> T get(Key<T> key, Provider<T> creator) {
-      @SuppressWarnings("unchecked")
-      T t = (T) map.get(key);
-      if (t == null) {
-        t = creator.get();
-        map.put(key, t);
-      }
-      return t;
-    }
-  }
 }

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

@@ -0,0 +1,85 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// 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 com.google.gerrit.server.git;
+
+import com.google.gerrit.server.RequestCleanup;
+import com.google.inject.Key;
+import com.google.inject.OutOfScopeException;
+import com.google.inject.Provider;
+import com.google.inject.Scope;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class PerThreadRequestScope {
+  private static final ThreadLocal<PerThreadRequestScope> current =
+      new ThreadLocal<PerThreadRequestScope>();
+
+  private static PerThreadRequestScope getContext() {
+    final PerThreadRequestScope ctx = current.get();
+    if (ctx == null) {
+      throw new OutOfScopeException("Not in command/request");
+    }
+    return ctx;
+  }
+
+  static PerThreadRequestScope set(PerThreadRequestScope ctx) {
+    PerThreadRequestScope old = current.get();
+    current.set(ctx);
+    return old;
+  }
+
+  static final Scope REQUEST = new Scope() {
+    public <T> Provider<T> scope(final Key<T> key, final Provider<T> creator) {
+      return new Provider<T>() {
+        public T get() {
+          return getContext().get(key, creator);
+        }
+
+        @Override
+        public String toString() {
+          return String.format("%s[%s]", creator, REQUEST);
+        }
+      };
+    }
+
+    @Override
+    public String toString() {
+      return "PerThreadRequestScope.REQUEST";
+    }
+  };
+
+  private static final Key<RequestCleanup> RC_KEY =
+      Key.get(RequestCleanup.class);
+
+  final RequestCleanup cleanup;
+  private final Map<Key<?>, Object> map;
+
+  PerThreadRequestScope() {
+    cleanup = new RequestCleanup();
+    map = new HashMap<Key<?>, Object>();
+    map.put(RC_KEY, cleanup);
+  }
+
+  synchronized <T> T get(Key<T> key, Provider<T> creator) {
+    @SuppressWarnings("unchecked")
+    T t = (T) map.get(key);
+    if (t == null) {
+      t = creator.get();
+      map.put(key, t);
+    }
+    return t;
+  }
+}

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

@@ -155,6 +155,16 @@ class PushOp implements ProjectRunnable {
   }
 
   public void run() {
+    PerThreadRequestScope ctx = new PerThreadRequestScope();
+    PerThreadRequestScope old = PerThreadRequestScope.set(ctx);
+    try {
+      runPushOperation();
+    } finally {
+      PerThreadRequestScope.set(old);
+    }
+  }
+
+  private void runPushOperation() {
     // Lock the queue, and remove ourselves, so we can't be modified once
     // we start replication (instead a new instance, with the same URI, is
     // created and scheduled for a future point in time.)

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

@@ -22,6 +22,7 @@ import com.google.gerrit.server.ReplicationUser;
 import com.google.gerrit.server.config.ConfigUtil;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.project.NoSuchProjectException;
+import com.google.gerrit.server.project.PerRequestProjectControlCache;
 import com.google.gerrit.server.project.ProjectControl;
 import com.google.gwtorm.client.SchemaFactory;
 import com.google.inject.AbstractModule;
@@ -29,6 +30,7 @@ import com.google.inject.Inject;
 import com.google.inject.Injector;
 import com.google.inject.Singleton;
 import com.google.inject.assistedinject.FactoryProvider;
+import com.google.inject.servlet.RequestScoped;
 
 import com.jcraft.jsch.Session;
 
@@ -373,6 +375,8 @@ public class PushReplication implements ReplicationQueue {
           injector.createChildInjector(new AbstractModule() {
             @Override
             protected void configure() {
+              bindScope(RequestScoped.class, PerThreadRequestScope.REQUEST);
+              bind(PerRequestProjectControlCache.class).in(RequestScoped.class);
               bind(CurrentUser.class).toInstance(remoteUser);
             }
           }).getInstance(ProjectControl.Factory.class);
@@ -396,6 +400,9 @@ public class PushReplication implements ReplicationQueue {
 
     void schedule(final Project.NameKey project, final String ref,
         final URIish uri) {
+      PerThreadRequestScope ctx = new PerThreadRequestScope();
+      PerThreadRequestScope old = PerThreadRequestScope.set(ctx);
+      try {
         try {
           if (!controlFor(project).isVisible()) {
             return;
@@ -405,6 +412,10 @@ public class PushReplication implements ReplicationQueue {
               + " not found during replication");
           return;
         }
+      } finally {
+        PerThreadRequestScope.set(old);
+      }
+
       synchronized (pending) {
         PushOp e = pending.get(uri);
         if (e == null) {
@@ -443,16 +454,6 @@ public class PushReplication implements ReplicationQueue {
      * @param pushOp The PushOp instance to be scheduled.
      */
     void reschedule(final PushOp pushOp) {
-      try {
-        if (!controlFor(pushOp.getProjectNameKey()).isVisible()) {
-          return;
-        }
-      } catch (NoSuchProjectException e1) {
-        log.error("Internal error: project " + pushOp.getProjectNameKey()
-            + " not found during replication");
-        return;
-      }
-
       // It locks access to pending variable.
       synchronized (pending) {
         URIish uri = pushOp.getURI();