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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.test;
import org.apache.lucene.util.Constants;
import org.apache.lucene.util.NamedThreadFactory;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.SuppressForbidden;
import org.elasticsearch.common.io.PathUtils;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.ESLoggerFactory;
import org.elasticsearch.common.logging.support.LoggerMessageFormat;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.frame.DelimiterBasedFrameDecoder;
import org.jboss.netty.handler.codec.frame.Delimiters;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.util.CharsetUtil;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import static java.lang.Thread.sleep;
import static java.util.Collections.unmodifiableMap;
/**
* Service that forks and manages Elasticsearch instances. This should be
* started before any backwards compatibility tests. Its a separate service to
* keep all forking out of the tests so they can continue to run under seccomp.
*
* The service takes single lines of the format "$command $arg $arg $arg\n". It
* replies over to the command with any number of lines and signals that it is
* done with the request by terminating the connection. Its up to the client to
* interpret the reply lines as informational or status.
*/
public class ExternalNodeService {
public static final int DEFAULT_PORT = 9871;
public static final String SHUTDOWN_MESSAGE = "shutting down";
static {
// Stick this as early as possible to make sure the any Elasticsearch logs get the right prefix.
System.setProperty("es.logger.prefix", "");
}
private static final ESLogger logger = ESLoggerFactory.getLogger("external-node-service");
public static void main(String[] args) throws IOException, InterruptedException {
int arg = 0;
int port = Integer.parseInt(System.getProperty("ens.port", Integer.toString(DEFAULT_PORT)));
if (args[arg].equals("shutdown")) {
sendShutdown(port);
return;
}
if (args[arg].equals("kill")) {
killAllBackwardsNodes();
return;
}
Path elasticsearchStable = getPath(args[arg++]);
boolean block = true;
if (arg < args.length) {
block = !"noblock".equals(args[arg++]);
}
killAllBackwardsNodes();
Map elasticsearches = new HashMap<>();
logger.info("Scanning for elasticsearches...");
try (DirectoryStream directoryStream = Files.newDirectoryStream(elasticsearchStable)) {
for (Path subdir : directoryStream) {
if (!Files.isDirectory(subdir)) {
continue;
}
String dirname = subdir.getFileName().toString();
if (!dirname.startsWith("elasticsearch-")) {
continue;
}
String version = dirname.substring("elasticsearch-".length());
logger.info("Found " + version);
elasticsearches.put(version, subdir);
}
}
if (elasticsearches.isEmpty()) {
throw new IllegalArgumentException("Couldn't find any elasticsearch installations in " + elasticsearchStable.toAbsolutePath());
}
ExternalNodeService service = new ExternalNodeService(port, unmodifiableMap(elasticsearches));
service.start();
if (block) {
/*
* If run from the command line we want to block. If run from maven
* we don't want to block. Instead we just let the main thread
* terminate here so that maven continues with the next steps and
* the daemon threads handle the connections.
*/
try {
while (true) {
sleep(1000);
}
} catch (InterruptedException e) {
// This is just ctrl-c. Its cool.
}
}
}
@SuppressForbidden(reason = "we don't have an environment to read from")
private static Path getPath(String location) {
return PathUtils.get(location);
}
private static void sendShutdown(int port) {
new ExternalNodeServiceClient(port).shutdownService();
}
/**
* Running elasticsearch instances indexed by port.
*/
private final ConcurrentMap runningElasticsearches = new ConcurrentHashMap<>();
/**
* Port on which the daemon should listen.
*/
private final int port;
/**
* Map from version to root of the untarred distribution.
*/
private final Map elasticsearchDistributions;
/**
* Is this service shutting down?
*/
private final AtomicBoolean shuttingDown = new AtomicBoolean(false);
private Thread shutdownHook;
private ServerBootstrap server;
public ExternalNodeService(int port, Map elasticsearches) throws IOException {
this.port = port;
this.elasticsearchDistributions = elasticsearches;
}
public void start() {
shutdownHook = new Thread(new ShutdownHandler());
Runtime.getRuntime().addShutdownHook(shutdownHook);
ChannelFactory factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(new DaemonizedThreadFactory("ens-boss")),
Executors.newCachedThreadPool(new DaemonizedThreadFactory("ens-worker")));
ServerBootstrap server = new ServerBootstrap(factory);
server.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
SimpleChannelHandler handler = new SimpleChannelHandler() {
AtomicBoolean sendingError = new AtomicBoolean(false);
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
String line = (String) e.getMessage();
logger.debug("Client sent [{}]", line);
Deque commandLine = new LinkedList<>();
Collections.addAll(commandLine, line.split(" "));
new Handler(e, commandLine).handle();
e.getChannel().close();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
if (e.getChannel().isOpen()) {
if (sendingError.compareAndSet(false, true)) {
e.getChannel().write(ChannelBuffers.copiedBuffer(
"Error processing request: " + e.getCause().getMessage() + '\n', StandardCharsets.UTF_8));
sendingError.set(false);
}
e.getChannel().close();
}
logger.error("Error", e.getCause());
}
};
return Channels.pipeline(new DelimiterBasedFrameDecoder(80960, Delimiters.lineDelimiter()),
new StringDecoder(CharsetUtil.UTF_8), handler);
}
});
server.setOption("child.tcpNoDelay", true);
server.setOption("child.keepAlive", true);
logger.debug("Binding localhost:" + port + "...");
try {
server.bind(new InetSocketAddress(InetAddress.getByName("localhost"), port));
} catch (UnknownHostException e) {
throw new RuntimeException("Couldn't find localhost!", e);
}
this.server = server;
logger.info("Bound localhost:" + port);
}
/**
* Called on startup to make sure that all backwards compatibility nodes
* that might have been created by previous runs of this are dead, dead,
* dead.
*/
private static void killAllBackwardsNodes() throws IOException, InterruptedException {
// This method is 1000% hacks and non-portable workarounds.
List commandLine = new ArrayList<>();
String bwcPathPart = "backwards";
String esPattern = "bootstrap.Elasticsearch";
if (Constants.WINDOWS) {
commandLine.add("wmic");
commandLine.add("process");
commandLine.add("where");
commandLine.add("Name like 'java%%.exe' and CommandLine like '%%" + bwcPathPart + "%%' and CommandLine like '%%"
+ esPattern + "%%'");
commandLine.add("get");
commandLine.add("ProcessId");
} else {
commandLine.add("bash");
commandLine.add("-c");
commandLine.add("ps aux | grep java | grep -v grep | grep " + bwcPathPart + " | grep " + esPattern
+ " | awk '{print $2}'");
}
ProcessBuilder builder = new ProcessBuilder(commandLine);
builder.redirectErrorStream(true);
Process process = null;
BufferedReader stdout = null;
List lines = new ArrayList<>();
List pids = new ArrayList<>();
try {
process = builder.start();
stdout = new BufferedReader(new InputStreamReader(process.getInputStream(), StandardCharsets.UTF_8));
if (Constants.WINDOWS) {
// In windows the first line is a heading or blank line
lines.add(stdout.readLine());
}
String line;
while ((line = stdout.readLine()) != null) {
lines.add(line);
if (line.isEmpty()) {
// Windows outputs a bunch of empty lines
continue;
}
pids.add(line.trim());
}
process.waitFor();
logger.debug("Process list: [{}]", lines);
if (process.exitValue() != 0) {
logger.error("Getting pids of backwards nodes failed with output [{}]", lines);
throw new RuntimeException("Getting pids of backwards nodes failed with exit code: [" + process.exitValue() + ']');
}
} finally {
if (stdout != null) {
stdout.close();
}
if (process != null) {
process.destroy();
}
}
if (pids.isEmpty() == false) {
logger.info("Killing backwards nodes running at [{}]", pids);
}
for (String pid : pids) {
new ProcessInfo(null, pid).stop();
}
}
private class Handler {
private final MessageEvent e;
private final Deque commandLine;
public Handler(MessageEvent e, Deque commandLine) {
this.e = e;
this.commandLine = commandLine;
}
private void handle() throws IOException {
String command = commandLine.pop();
switch (command) {
case "start":
start(commandLine);
return;
case "stop":
stop(commandLine);
return;
case "shutdown":
message(SHUTDOWN_MESSAGE);
// Can't run shutdown directly because netty complains that it could cause a deadlock.
shutdownHook.start();
return;
default:
message("unknown command: " + command);
return;
}
}
private void start(Deque commandLine) throws IOException {
if (commandLine.isEmpty()) {
message("No version sent!");
return;
}
String version = commandLine.pop();
Path versionRoot = elasticsearchDistributions.get(version);
if (versionRoot == null) {
message("Version not found: " + version);
return;
}
String pidFile = getPidFile(commandLine);
message("starting elasticsearch " + version + "...");
List command = buildStartCommand(versionRoot.toAbsolutePath().normalize(), commandLine);
StringBuilder startReproduction = new StringBuilder();
boolean first = true;
for (String c : command) {
if (first) {
first = false;
} else {
startReproduction.append(' ');
}
startReproduction.append(c);
}
logger.debug("Starting elasticsearch with {}", startReproduction);
ProcessBuilder builder = new ProcessBuilder(command);
builder.environment().put("ES_HEAP_SIZE", "256m");
builder.inheritIO();
Process process = null;
String pid = null;
try {
// we have to delete the pid file which might be leftover from previous tests in the same suite
// otherwise the ExternalNodeService reads the old pid file and later tries to stop the wrong process
Files.deleteIfExists(getPath(pidFile));
process = builder.start();
pid = getPid(pidFile);
message("process forked");
runningElasticsearches.put(pid, new ProcessInfo(process, pid));
message("pid [" + pid + "]");
message("started");
} finally {
if (pid == null) {
logger.error("It looks like we failed to launch elasticsearch.");
logger.error("We tried to start it like this: {}", startReproduction);
if (process != null) {
// In Java 1.8 this should be destroyForcibly
process.destroy();
}
}
}
}
private String getPid(String pidFile) throws IOException {
Path pidPath = getPath(pidFile);
long maxTimeInMillis = 10000;
long startTime = System.currentTimeMillis();
while (System.currentTimeMillis() - startTime < maxTimeInMillis) {
if (Files.exists(pidPath)) {
BufferedReader reader = Files.newBufferedReader(pidPath, StandardCharsets.UTF_8);
String pid = reader.readLine();
reader.close();
if (pid != null) {
return pid;
}
}
try {
sleep(500);
} catch (InterruptedException e) {
logger.info("Interrupted while waiting for pid file of external node.", e);
break;
}
}
throw new ElasticsearchException("Could not start external node, pid was not found.");
}
public String getPidFile(Deque commandLine) {
for (String param: commandLine) {
if (param.contains("pidfile")) {
return param.substring("-Des.pidfile=".length(), param.length());
}
}
throw new ElasticsearchException("Cannot start external node. pidfile parameter missing.");
}
private void stop(Deque commandLine) {
if (commandLine.isEmpty()) {
message("no pid sent!");
return;
}
String pid = commandLine.pop();
ProcessInfo elasticsearch = runningElasticsearches.remove(pid);
if (elasticsearch == null) {
message("couldn't find elasticsearch with pid " + pid + "!");
return;
}
message("killing elasticsearch with pid " + pid);
try {
elasticsearch.stop();
} catch (InterruptedException e) {
message("timed out waiting for elasticsearch to stop!");
runningElasticsearches.put(pid, elasticsearch);
return;
} catch (IOException e) {
message("error waiting for elasticsearch to stop: [" + e.getMessage() + "]");
logger.warn("Error waiting for elasticsearch to stop", e);
runningElasticsearches.put(pid, elasticsearch);
return;
}
message("killed");
}
private void message(String message) {
logger.debug("Sending [{}] to client", message);
e.getChannel().write(ChannelBuffers.copiedBuffer(message + '\n', StandardCharsets.UTF_8));
}
private List buildStartCommand(Path versionRoot, Deque commandLine) {
String executable = Constants.WINDOWS ? "elasticsearch.bat" : "elasticsearch";
List command = new ArrayList<>();
command.add(versionRoot.resolve("bin").resolve(executable).toString());
while (!commandLine.isEmpty()) {
String arg = commandLine.pop();
arg = arg.replace("${PATH}", versionRoot.toString());
command.add(arg);
}
// We need at least INFO in http and node
command.add("-Des.logger.transport=INFO");
command.add("-Des.logger.node=INFO");
// It'd be nice to conditionally apply these but that can wait.
return command;
}
}
/**
* Catches shutdown and shuts down
*/
private class ShutdownHandler implements Runnable {
@Override
public void run() {
if (!shuttingDown.compareAndSet(false, true)) {
logger.debug("Shutting down twice. Weird but ok.");
return;
}
logger.info("Shutting down");
if (shutdownHook != null) {
// The hook may be null if we never started
try {
Runtime.getRuntime().removeShutdownHook(shutdownHook);
} catch (IllegalStateException e) {
// Its cool - this is caused by trying to remove the hook
// during shutdown
}
}
for (Map.Entry elasticsearch : runningElasticsearches.entrySet()) {
logger.debug("Kill -9ing elasticsearch running at localhost:{}", elasticsearch.getKey());
// In Java 1.8 this should be destroyForcibly.
try {
elasticsearch.getValue().stop();
} catch (IOException | InterruptedException e) {
logger.error("Error stopping elasticsearch", e);
}
}
if (server != null) {
logger.debug("Shutting down server");
server.shutdown();
}
}
}
/**
* Daemonized ThreadFactory used so this won't block in maven.
*/
private static class DaemonizedThreadFactory extends NamedThreadFactory {
public DaemonizedThreadFactory(String threadNamePrefix) {
super(threadNamePrefix);
}
@Override
public Thread newThread(Runnable r) {
Thread t = super.newThread(r);
t.setDaemon(true);
return t;
}
}
private static class ProcessInfo {
private final Process process;
private final String pid;
public ProcessInfo(@Nullable Process process, String pid) {
this.process = process;
this.pid = pid;
}
public void stop() throws IOException, InterruptedException {
/*
* process.destroy doesn't work properly on windows and sometimes we
* want to kill by pid so we just go with the super aggressive
* option every time.....
*/
List commandLine = new ArrayList<>();
if (Constants.WINDOWS) {
commandLine.add("taskkill");
commandLine.add("/F"); // Force
commandLine.add("/PID");
commandLine.add(pid);
} else {
commandLine.add("kill");
commandLine.add("-9"); // Force
commandLine.add(pid);
}
ProcessBuilder builder = new ProcessBuilder(commandLine);
Process killProcess = null;
try {
logger.debug("Killing [{}]", pid);
killProcess = builder.start();
killProcess.waitFor();
if (killProcess.exitValue() != 0) {
throw new RuntimeException(
LoggerMessageFormat.format("Killing [{}] failed with exit code [{}]", pid, killProcess.exitValue()));
}
} finally {
if (killProcess != null) {
killProcess.destroy();
}
}
if (process != null) {
process.waitFor();
}
}
}
}
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