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com.google.gerrit.server.plugins.ServerPlugin Maven / Gradle / Ivy
// Copyright (C) 2012 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.plugins;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.registration.RegistrationHandle;
import com.google.gerrit.extensions.registration.ReloadableRegistrationHandle;
import com.google.gerrit.lifecycle.LifecycleManager;
import com.google.gerrit.server.PluginUser;
import com.google.gerrit.server.util.RequestContext;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import java.io.IOException;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import org.eclipse.jgit.internal.storage.file.FileSnapshot;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ServerPlugin extends Plugin {
private static final Logger log = LoggerFactory.getLogger(ServerPlugin.class);
private final Manifest manifest;
private final PluginContentScanner scanner;
private final Path dataDir;
private final String pluginCanonicalWebUrl;
private final ClassLoader classLoader;
private final String metricsPrefix;
protected Class sysModule;
protected Class sshModule;
protected Class httpModule;
private Injector sysInjector;
private Injector sshInjector;
private Injector httpInjector;
private LifecycleManager serverManager;
private List> reloadableHandles;
public ServerPlugin(
String name,
String pluginCanonicalWebUrl,
PluginUser pluginUser,
Path srcJar,
FileSnapshot snapshot,
PluginContentScanner scanner,
Path dataDir,
ClassLoader classLoader,
String metricsPrefix)
throws InvalidPluginException {
super(
name,
srcJar,
pluginUser,
snapshot,
scanner == null ? ApiType.PLUGIN : Plugin.getApiType(getPluginManifest(scanner)));
this.pluginCanonicalWebUrl = pluginCanonicalWebUrl;
this.scanner = scanner;
this.dataDir = dataDir;
this.classLoader = classLoader;
this.manifest = scanner == null ? null : getPluginManifest(scanner);
this.metricsPrefix = metricsPrefix;
if (manifest != null) {
loadGuiceModules(manifest, classLoader);
}
}
public ServerPlugin(
String name,
String pluginCanonicalWebUrl,
PluginUser pluginUser,
Path srcJar,
FileSnapshot snapshot,
PluginContentScanner scanner,
Path dataDir,
ClassLoader classLoader)
throws InvalidPluginException {
this(
name,
pluginCanonicalWebUrl,
pluginUser,
srcJar,
snapshot,
scanner,
dataDir,
classLoader,
null);
}
private void loadGuiceModules(Manifest manifest, ClassLoader classLoader)
throws InvalidPluginException {
Attributes main = manifest.getMainAttributes();
String sysName = main.getValue("Gerrit-Module");
String sshName = main.getValue("Gerrit-SshModule");
String httpName = main.getValue("Gerrit-HttpModule");
if (!Strings.isNullOrEmpty(sshName) && getApiType() != Plugin.ApiType.PLUGIN) {
throw new InvalidPluginException(
String.format(
"Using Gerrit-SshModule requires Gerrit-ApiType: %s", Plugin.ApiType.PLUGIN));
}
try {
this.sysModule = load(sysName, classLoader);
this.sshModule = load(sshName, classLoader);
this.httpModule = load(httpName, classLoader);
} catch (ClassNotFoundException e) {
throw new InvalidPluginException("Unable to load plugin Guice Modules", e);
}
}
@SuppressWarnings("unchecked")
protected static Class load(String name, ClassLoader pluginLoader)
throws ClassNotFoundException {
if (Strings.isNullOrEmpty(name)) {
return null;
}
Class clazz = Class.forName(name, false, pluginLoader);
if (!Module.class.isAssignableFrom(clazz)) {
throw new ClassCastException(
String.format("Class %s does not implement %s", name, Module.class.getName()));
}
return (Class) clazz;
}
Path getDataDir() {
return dataDir;
}
String getPluginCanonicalWebUrl() {
return pluginCanonicalWebUrl;
}
String getMetricsPrefix() {
return metricsPrefix;
}
private static Manifest getPluginManifest(PluginContentScanner scanner)
throws InvalidPluginException {
try {
return scanner.getManifest();
} catch (IOException e) {
throw new InvalidPluginException("Cannot get plugin manifest", e);
}
}
@Override
@Nullable
public String getVersion() {
Attributes main = manifest.getMainAttributes();
return main.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
}
@Override
protected boolean canReload() {
Attributes main = manifest.getMainAttributes();
String v = main.getValue("Gerrit-ReloadMode");
if (Strings.isNullOrEmpty(v) || "reload".equalsIgnoreCase(v)) {
return true;
} else if ("restart".equalsIgnoreCase(v)) {
return false;
} else {
log.warn("Plugin {} has invalid Gerrit-ReloadMode {}; assuming restart", getName(), v);
return false;
}
}
@Override
protected void start(PluginGuiceEnvironment env) throws Exception {
RequestContext oldContext = env.enter(this);
try {
startPlugin(env);
} finally {
env.exit(oldContext);
}
}
private void startPlugin(PluginGuiceEnvironment env) throws Exception {
Injector root = newRootInjector(env);
serverManager = new LifecycleManager();
serverManager.add(root);
AutoRegisterModules auto = null;
if (sysModule == null && sshModule == null && httpModule == null) {
auto = new AutoRegisterModules(getName(), env, scanner, classLoader);
auto.discover();
}
if (sysModule != null) {
sysInjector = root.createChildInjector(root.getInstance(sysModule));
serverManager.add(sysInjector);
} else if (auto != null && auto.sysModule != null) {
sysInjector = root.createChildInjector(auto.sysModule);
serverManager.add(sysInjector);
} else {
sysInjector = root;
}
if (env.hasSshModule()) {
List modules = new ArrayList<>();
if (getApiType() == ApiType.PLUGIN) {
modules.add(env.getSshModule());
}
if (sshModule != null) {
modules.add(sysInjector.getInstance(sshModule));
sshInjector = sysInjector.createChildInjector(modules);
serverManager.add(sshInjector);
} else if (auto != null && auto.sshModule != null) {
modules.add(auto.sshModule);
sshInjector = sysInjector.createChildInjector(modules);
serverManager.add(sshInjector);
}
}
if (env.hasHttpModule()) {
List modules = new ArrayList<>();
if (getApiType() == ApiType.PLUGIN) {
modules.add(env.getHttpModule());
}
if (httpModule != null) {
modules.add(sysInjector.getInstance(httpModule));
httpInjector = sysInjector.createChildInjector(modules);
serverManager.add(httpInjector);
} else if (auto != null && auto.httpModule != null) {
modules.add(auto.httpModule);
httpInjector = sysInjector.createChildInjector(modules);
serverManager.add(httpInjector);
}
}
serverManager.start();
}
private Injector newRootInjector(final PluginGuiceEnvironment env) {
List modules = Lists.newArrayListWithCapacity(2);
if (getApiType() == ApiType.PLUGIN) {
modules.add(env.getSysModule());
}
modules.add(new ServerPluginInfoModule(this, env.getServerMetrics()));
return Guice.createInjector(modules);
}
@Override
protected void stop(PluginGuiceEnvironment env) {
if (serverManager != null) {
RequestContext oldContext = env.enter(this);
try {
serverManager.stop();
} finally {
env.exit(oldContext);
}
serverManager = null;
sysInjector = null;
sshInjector = null;
httpInjector = null;
}
}
@Override
public Injector getSysInjector() {
return sysInjector;
}
@Override
@Nullable
public Injector getSshInjector() {
return sshInjector;
}
@Override
@Nullable
public Injector getHttpInjector() {
return httpInjector;
}
@Override
public void add(RegistrationHandle handle) {
if (serverManager != null) {
if (handle instanceof ReloadableRegistrationHandle) {
if (reloadableHandles == null) {
reloadableHandles = new ArrayList<>();
}
reloadableHandles.add((ReloadableRegistrationHandle) handle);
}
serverManager.add(handle);
}
}
@Override
public PluginContentScanner getContentScanner() {
return scanner;
}
}
