Load gerrit.config through Guice injection

Rather than loading it in GerritServer we can load it directly through
Guice, making it available as a singleton to anyone who wants access.

Signed-off-by: Shawn O. Pearce <sop@google.com>

src/main/java/com/google/gerrit/server/GerritServer.java

@@ -21,13 +21,13 @@ import com.google.gerrit.client.reviewdb.ReviewDb;
 import com.google.gerrit.client.reviewdb.SystemConfig;
 import com.google.gerrit.client.reviewdb.SystemConfig.LoginType;
 import com.google.gerrit.client.rpc.Common;
+import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePath;
 import com.google.gerrit.server.mail.EmailException;
 import com.google.gerrit.server.patch.DiffCacheEntryFactory;
 import com.google.gerrit.server.ssh.SshKeyCacheEntryFactory;
 import com.google.gwtjsonrpc.server.SignedToken;
 import com.google.gwtjsonrpc.server.XsrfException;
-import com.google.gwtorm.client.OrmException;
 import com.google.gwtorm.jdbc.Database;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
@@ -46,20 +46,15 @@ import org.apache.commons.net.smtp.SMTPClient;
 import org.apache.commons.net.smtp.SMTPReply;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.spearce.jgit.errors.ConfigInvalidException;
 import org.spearce.jgit.errors.RepositoryNotFoundException;
 import org.spearce.jgit.lib.Config;
-import org.spearce.jgit.lib.FileBasedConfig;
 import org.spearce.jgit.lib.PersonIdent;
 import org.spearce.jgit.lib.Repository;
 import org.spearce.jgit.lib.RepositoryCache;
 import org.spearce.jgit.lib.UserConfig;
-import org.spearce.jgit.lib.WindowCache;
-import org.spearce.jgit.lib.WindowCacheConfig;
 import org.spearce.jgit.lib.RepositoryCache.FileKey;
 
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.Arrays;
 
@@ -103,7 +98,7 @@ public class GerritServer {
 
   private final Database<ReviewDb> db;
   private final File sitePath;
-  private final FileBasedConfig gerritConfigFile;
+  private final Config gerritConfigFile;
   private final int sessionAge;
   private final SignedToken xsrf;
   private final SignedToken account;
@@ -114,23 +109,12 @@ public class GerritServer {
 
   @Inject
   GerritServer(final Database<ReviewDb> database, final SystemConfig sConfig,
-      @SitePath final File path) throws OrmException, XsrfException {
+      @SitePath final File path, @GerritServerConfig final Config cfg)
+      throws XsrfException {
     db = database;
     sitePath = path;
-
-    final File cfgLoc = new File(sitePath, "gerrit.config");
-    gerritConfigFile = new FileBasedConfig(cfgLoc);
-    try {
-      gerritConfigFile.load();
-    } catch (FileNotFoundException e) {
-      log.info("No " + cfgLoc.getAbsolutePath() + "; assuming defaults");
-    } catch (ConfigInvalidException e) {
-      throw new OrmException("Cannot read " + cfgLoc.getAbsolutePath(), e);
-    } catch (IOException e) {
-      throw new OrmException("Cannot read " + cfgLoc.getAbsolutePath(), e);
-    }
-    reconfigureWindowCache();
-    sessionAge = gerritConfigFile.getInt("auth", "maxsessionage", 12 * 60) * 60;
+    gerritConfigFile = cfg;
+    sessionAge = cfg.getInt("auth", "maxsessionage", 12 * 60) * 60;
 
     xsrf = new SignedToken(getSessionAge(), sConfig.xsrfPrivateKey);
 
@@ -147,8 +131,7 @@ public class GerritServer {
     account = new SignedToken(accountCookieAge, sConfig.accountPrivateKey);
     emailReg = new SignedToken(5 * 24 * 60 * 60, sConfig.accountPrivateKey);
 
-    final String basePath =
-        getGerritConfig().getString("gerrit", null, "basepath");
+    final String basePath = cfg.getString("gerrit", null, "basepath");
     if (basePath != null) {
       File root = new File(basePath);
       if (!root.isAbsolute()) {
@@ -341,12 +324,6 @@ public class GerritServer {
     return client;
   }
 
-  private void reconfigureWindowCache() {
-    final WindowCacheConfig c = new WindowCacheConfig();
-    c.fromConfig(gerritConfigFile);
-    WindowCache.reconfigure(c);
-  }
-
   /** Time (in seconds) that user sessions stay "signed in". */
   public int getSessionAge() {
     return sessionAge;

src/main/java/com/google/gerrit/server/GerritServerModule.java

@@ -23,6 +23,8 @@ import com.google.gerrit.git.ChangeMergeQueue;
 import com.google.gerrit.git.MergeQueue;
 import com.google.gerrit.git.PushReplication;
 import com.google.gerrit.git.ReplicationQueue;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.config.GerritServerConfigProvider;
 import com.google.gerrit.server.config.SitePath;
 import com.google.gerrit.server.config.SitePathProvider;
 import com.google.gwtorm.client.SchemaFactory;
@@ -32,6 +34,8 @@ import com.google.inject.Key;
 import com.google.inject.TypeLiteral;
 import com.google.inject.name.Names;
 
+import org.spearce.jgit.lib.Config;
+
 import java.io.File;
 
 import javax.sql.DataSource;
@@ -53,6 +57,8 @@ public class GerritServerModule extends AbstractModule {
         SINGLETON);
     bind(File.class).annotatedWith(SitePath.class).toProvider(
         SitePathProvider.class);
+    bind(Config.class).annotatedWith(GerritServerConfig.class).toProvider(
+        GerritServerConfigProvider.class).in(SINGLETON);
 
     bind(GerritServer.class);
     bind(ContactStore.class).toProvider(EncryptedContactStoreProvider.class);

src/main/java/com/google/gerrit/server/config/GerritServerConfig.java

@@ -0,0 +1,32 @@
+// 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.config;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import com.google.inject.BindingAnnotation;
+
+import java.lang.annotation.Retention;
+
+/**
+ * Marker on {@link org.spearce.jgit.lib.Config} holding {@code gerrit.config} .
+ * <p>
+ * The {@code gerrit.config} file contains almost all site-wide configuration
+ * settings for the Gerrit Code Review server.
+ */
+@Retention(RUNTIME)
+@BindingAnnotation
+public @interface GerritServerConfig {
+}

src/main/java/com/google/gerrit/server/config/GerritServerConfigProvider.java

@@ -0,0 +1,68 @@
+// 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.config;
+
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.ProvisionException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.spearce.jgit.errors.ConfigInvalidException;
+import org.spearce.jgit.lib.Config;
+import org.spearce.jgit.lib.FileBasedConfig;
+import org.spearce.jgit.lib.WindowCache;
+import org.spearce.jgit.lib.WindowCacheConfig;
+
+import java.io.File;
+import java.io.IOException;
+
+/** Provides {@link Config} annotated with {@link GerritServerConfig}. */
+public class GerritServerConfigProvider implements Provider<Config> {
+  private static final Logger log =
+      LoggerFactory.getLogger(GerritServerConfigProvider.class);
+
+  private final File sitePath;
+
+  @Inject
+  GerritServerConfigProvider(@SitePath final File path) {
+    sitePath = path;
+  }
+
+  @Override
+  public Config get() {
+    final File cfgPath = new File(sitePath, "gerrit.config");
+    final FileBasedConfig cfg = new FileBasedConfig(sitePath);
+
+    if (!cfg.getFile().exists()) {
+      log.info("No " + cfgPath.getAbsolutePath() + "; assuming defaults");
+      return cfg;
+    }
+
+    try {
+      cfg.load();
+    } catch (IOException e) {
+      throw new ProvisionException(e.getMessage(), e);
+    } catch (ConfigInvalidException e) {
+      throw new ProvisionException(e.getMessage(), e);
+    }
+
+    final WindowCacheConfig c = new WindowCacheConfig();
+    c.fromConfig(cfg);
+    WindowCache.reconfigure(c);
+
+    return cfg;
+  }
+}