/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.jooby.crash;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Properties;
import java.util.ServiceLoader;
import java.util.Set;
import org.crsh.plugin.CRaSHPlugin;
import org.crsh.plugin.PluginContext;
import org.jooby.Env;
import org.jooby.Jooby.Module;
import org.jooby.Registry;
import org.jooby.Route;
import org.jooby.WebSocket;
import org.slf4j.bridge.SLF4JBridgeHandler;
import com.google.common.collect.Sets;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.multibindings.Multibinder;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import javaslang.concurrent.Promise;
/**
* <h1>crash</h1>
* <p>
* Connect, monitor or use virtual machine resources via SSH, telnet or HTTP with
* <a href="http://www.crashub.org">CRaSH remote shell.</a>
* </p>
*
* <h2>usage</h2>
*
* <pre>{@code
* import org.jooby.crash;
*
* {
* use(new Crash());
* }
* }</pre>
*
* <p>
* That's all you need to get <a href="http://www.crashub.org">CRaSH</a> up and running!!!
* </p>
* <p>
* Now is time to see how to connect and interact with the <a href="http://www.crashub.org">CRaSH
* shell</a>
* </p>
*
* <h2>commands</h2>
* <p>
* You can write additional shell commands using Groovy or Java, see the
* <a href="http://www.crashub.org/1.3/reference.html#developping_commands">CRaSH documentation for
* details</a>. CRaSH search for commands in the <code>cmd</code> folder.
* </p>
* <p>
* Here is a simple ‘hello’ command that could be loaded from <code>cmd/hello.groovy</code> folder:
* </p>
* <pre>{@code
* package commands
*
* import org.crsh.cli.Command
* import org.crsh.cli.Usage
* import org.crsh.command.InvocationContext
*
* class hello {
*
* @Usage("Say Hello")
* @Command
* def main(InvocationContext context) {
* return "Hello"
* }
*
* }
* }</pre>
*
* <p>
* Jooby adds some additional attributes and commands to InvocationContext that you can access from
* your command:
* </p>
*
* <ul>
* <li>registry: Access to {@link Registry}.</li>
* <li>conf: Access to {@link Config}.</li>
* </ul>
*
* <h3>routes command</h3>
* <p>
* The <code>routes</code> print all the application routes.
* </p>
*
* <h3>conf command</h3>
* <p>
* The <code>conf tree</code> print the application configuration tree (configuration precedence).
* </p>
*
* <p>
* The <code>conf props [path]</code> print all the application properties, sub-tree or a single
* property if <code>path</code> argument is present.
* </p>
*
* <h2>connectors</h2>
*
* <h3>HTTP connector</h3>
* <p>
* The HTTP connector is a simple yet powerful collection of HTTP endpoints where you can
* run
* <a href="http://www.crashub.org/1.3/reference.html#developping_commands">CRaSH
* command</a>:
* </p>
*
* <pre>{@code
*
* {
* use(new Crash()
* .plugin(HttpShellPlugin.class)
* );
* }
* }</pre>
*
* <p>
* Try it:
* </p>
*
* <pre>
* GET /api/shell/thread/ls
* </pre>
*
* <p>
* OR:
* </p>
*
* <pre>
* GET /api/shell/thread ls
* </pre>
*
* <p>
* The connector listen at <code>/api/shell</code>. If you want to mount the connector some
* where
* else just set the property: <code>crash.httpshell.path</code>.
* </p>
*
* <h3>SSH connector</h3>
* <p>
* Just add the <a href=
* "https://mvnrepository.com/artifact/org.crashub/crash.connectors.ssh">crash.connectors.ssh</a>
* dependency to your project.
* </p>
*
* <p>
* Try it:
* </p>
*
* <pre>
* ssh -p 2000 admin@localhost
* </pre>
*
* <p>
* Default user and password is: <code>admin</code>. See how to provide a custom
* <a href="http://www.crashub.org/1.3/reference.html#pluggable_auth">authentication
* plugin</a>.
* </p>
*
* <h3>telnet connector</h3>
* <p>
* Just add the <a href=
* "https://mvnrepository.com/artifact/org.crashub/crash.connectors.telnet">crash.connectors.telnet</a>
* dependency to your project.
* </p>
*
* <p>
* Try it:
* </p>
*
* <pre>
* telnet localhost 5000
* </pre>
*
* <p>
* Checkout complete
* <a href="http://www.crashub.org/1.3/reference.html#_telnet_connector">telnet
* connector</a> configuration.
* </p>
*
* <h3>web connector</h3>
* <p>
* Just add the <a href=
* "https://mvnrepository.com/artifact/org.crashub/crash.connectors.web">crash.connectors.web</a>
* dependency to your project.
* </p>
*
* <p>
* Try it:
* </p>
*
* <pre>
* GET /shell
* </pre>
*
* <p>
* A web shell console will be ready to go at <code>/shell</code>. If you want to mount the
* connector some where else just set the property: <code>crash.webshell.path</code>.
* </p>
*
* @author edgar
* @since 1.0.0
*/
@SuppressWarnings({"unchecked", "rawtypes" })
public class Crash implements Module {
static {
if (!SLF4JBridgeHandler.isInstalled()) {
SLF4JBridgeHandler.removeHandlersForRootLogger();
SLF4JBridgeHandler.install();
}
}
private static final Key<Set<CRaSHPlugin>> PLUGINS = Key
.get(new TypeLiteral<Set<CRaSHPlugin>>() {
});
private final Set<Class> plugins = new HashSet<>();
private final ClassLoader loader;
/**
* Creates a new {@link Crash} module.
*
* @param loader Class loader to use or <code>null</code>.
*/
public Crash(final ClassLoader loader) {
this.loader = Optional.ofNullable(loader).orElse(getClass().getClassLoader());
}
/**
* Creates a new {@link Crash} module.
*/
public Crash() {
this(null);
}
/**
* Add a custom plugin to CRaSH.
*
* @param plugin Plugin class.
* @return This module.
*/
public Crash plugin(final Class<? extends CRaSHPlugin> plugin) {
plugins.add(plugin);
return this;
}
@Override
public void configure(final Env env, final Config conf, final Binder binder) {
Properties props = new Properties();
if (conf.hasPath("crash")) {
conf.getConfig("crash").entrySet().forEach(
e -> props.setProperty("crash." + e.getKey(), e.getValue().unwrapped().toString()));
}
Map<String, Object> attributes = new HashMap<>();
attributes.put("conf", conf);
// connectors.web on classpath?
boolean webShell = loader.getResource("META-INF/resources/js/crash.js") != null;
if (webShell) {
plugins.add(WebShellPlugin.class);
WebShellPlugin.install(env, conf);
}
if (plugins.contains(HttpShellPlugin.class)) {
HttpShellPlugin.install(env, conf);
}
Multibinder<CRaSHPlugin> mb = Multibinder.newSetBinder(binder, CRaSHPlugin.class);
plugins.forEach(it -> mb.addBinding().to(it));
CrashBootstrap crash = new CrashBootstrap();
Promise<PluginContext> promise = Promise.make();
binder.bind(PluginContext.class).toProvider(promise.future()::get);
env.onStart(r -> {
Set<Route.Definition> routes = r.require(Route.KEY);
Set<WebSocket.Definition> sockets = r.require(WebSocket.KEY);
attributes.put("registry", r);
attributes.put("routes", routes);
attributes.put("websockets", sockets);
attributes.put("env", env);
Set plugins = Sets.newHashSet(r.require(PLUGINS));
ServiceLoader.load(CRaSHPlugin.class, this.loader).forEach(plugins::add);
promise.success(crash.start(loader, props, attributes, plugins));
});
env.onStop(crash::stop);
}
@Override
public Config config() {
return ConfigFactory.parseResources(getClass(), "crash.conf");
}
}