// 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.httpd;
import static com.google.inject.Scopes.SINGLETON;
import static com.google.inject.Stage.PRODUCTION;
import com.google.gerrit.lifecycle.LifecycleManager;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.server.config.AuthConfigModule;
import com.google.gerrit.server.config.CanonicalWebUrlModule;
import com.google.gerrit.server.config.GerritGlobalModule;
import com.google.gerrit.server.config.GerritServerConfigModule;
import com.google.gerrit.server.config.MasterNodeStartup;
import com.google.gerrit.server.config.SitePath;
import com.google.gerrit.server.config.SitePathFromSystemConfigProvider;
import com.google.gerrit.server.schema.DataSourceProvider;
import com.google.gerrit.server.schema.DatabaseModule;
import com.google.gerrit.sshd.SshModule;
import com.google.gerrit.sshd.commands.MasterCommandModule;
import com.google.inject.AbstractModule;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.name.Names;
import com.google.inject.servlet.GuiceServletContextListener;
import com.google.inject.spi.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.servlet.ServletContextEvent;
import javax.servlet.http.HttpServletRequest;
import javax.sql.DataSource;
/** Configures the web application environment for Gerrit Code Review. */
public class WebAppInitializer extends GuiceServletContextListener {
private static final Logger log =
LoggerFactory.getLogger(WebAppInitializer.class);
private File sitePath;
private Injector dbInjector;
private Injector cfgInjector;
private Injector sysInjector;
private Injector webInjector;
private Injector sshInjector;
private LifecycleManager manager;
private synchronized void init() {
if (manager == null) {
final String path = System.getProperty("gerrit.site_path");
if (path != null) {
sitePath = new File(path);
}
try {
dbInjector = createDbInjector();
} catch (CreationException ce) {
final Message first = ce.getErrorMessages().iterator().next();
final StringBuilder buf = new StringBuilder();
buf.append(first.getMessage());
Throwable why = first.getCause();
while (why != null) {
buf.append("\n caused by ");
buf.append(why.toString());
why = why.getCause();
}
if (first.getCause() != null) {
buf.append("\n");
buf.append("\nResolve above errors before continuing.");
buf.append("\nComplete stack trace follows:");
}
log.error(buf.toString(), first.getCause());
throw new CreationException(Collections.singleton(first));
}
cfgInjector = createCfgInjector();
sysInjector = createSysInjector();
sshInjector = createSshInjector();
webInjector = createWebInjector();
// Push the Provider<HttpServletRequest> down into the canonical
// URL provider. Its optional for that provider, but since we can
// supply one we should do so, in case the administrator has not
// setup the canonical URL in the configuration file.
//
// Note we have to do this manually as Guice failed to do the
// injection here because the HTTP environment is not visible
// to the core server modules.
//
sysInjector.getInstance(HttpCanonicalWebUrlProvider.class)
.setHttpServletRequest(
webInjector.getProvider(HttpServletRequest.class));
manager = new LifecycleManager();
manager.add(dbInjector);
manager.add(sysInjector);
manager.add(sshInjector);
manager.add(webInjector);
}
}
private Injector createDbInjector() {
final List<Module> modules = new ArrayList<Module>();
if (sitePath != null) {
modules.add(new LifecycleModule() {
@Override
protected void configure() {
bind(File.class).annotatedWith(SitePath.class).toInstance(sitePath);
bind(DataSourceProvider.Context.class).toInstance(
DataSourceProvider.Context.MULTI_USER);
bind(Key.get(DataSource.class, Names.named("ReviewDb"))).toProvider(
DataSourceProvider.class).in(SINGLETON);
listener().to(DataSourceProvider.class);
}
});
modules.add(new GerritServerConfigModule());
} else {
modules.add(new LifecycleModule() {
@Override
protected void configure() {
bind(Key.get(DataSource.class, Names.named("ReviewDb"))).toProvider(
ReviewDbDataSourceProvider.class).in(SINGLETON);
listener().to(ReviewDbDataSourceProvider.class);
}
});
}
modules.add(new DatabaseModule());
return Guice.createInjector(PRODUCTION, modules);
}
private Injector createCfgInjector() {
final List<Module> modules = new ArrayList<Module>();
if (sitePath == null) {
// If we didn't get the site path from the system property
// we need to get it from the database, as that's our old
// method of locating the site path on disk.
//
modules.add(new AbstractModule() {
@Override
protected void configure() {
bind(File.class).annotatedWith(SitePath.class).toProvider(
SitePathFromSystemConfigProvider.class).in(SINGLETON);
}
});
modules.add(new GerritServerConfigModule());
}
modules.add(new AuthConfigModule());
return dbInjector.createChildInjector(modules);
}
private Injector createSysInjector() {
final List<Module> modules = new ArrayList<Module>();
modules.add(cfgInjector.getInstance(GerritGlobalModule.class));
modules.add(new CanonicalWebUrlModule() {
@Override
protected Class<? extends Provider<String>> provider() {
return HttpCanonicalWebUrlProvider.class;
}
});
modules.add(new MasterNodeStartup());
return cfgInjector.createChildInjector(modules);
}
private Injector createSshInjector() {
final List<Module> modules = new ArrayList<Module>();
modules.add(new SshModule());
modules.add(new MasterCommandModule());
return sysInjector.createChildInjector(modules);
}
private Injector createWebInjector() {
final List<Module> modules = new ArrayList<Module>();
modules.add(sshInjector.getInstance(WebModule.class));
return sysInjector.createChildInjector(modules);
}
@Override
protected Injector getInjector() {
init();
return webInjector;
}
@Override
public void contextInitialized(final ServletContextEvent event) {
super.contextInitialized(event);
init();
manager.start();
}
@Override
public void contextDestroyed(final ServletContextEvent event) {
if (manager != null) {
manager.stop();
manager = null;
}
super.contextDestroyed(event);
}
}