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/* LanguageTool, a natural language style checker
* Copyright (C) 2012 Daniel Naber (http://www.danielnaber.de)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/
package org.languagetool.server;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.sun.net.httpserver.HttpServer;
import org.jetbrains.annotations.Nullable;
import org.languagetool.JLanguageTool;
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import static org.languagetool.server.HTTPServerConfig.DEFAULT_PORT;
/**
* Super class for HTTP and HTTPS server.
*
* @since 2.0
*/
abstract class Server {
protected abstract String getProtocol();
protected static final Set DEFAULT_ALLOWED_IPS = new HashSet<>(Arrays.asList(
"0:0:0:0:0:0:0:1", // Suse Linux IPv6 stuff
"0:0:0:0:0:0:0:1%0", // some(?) Mac OS X
"127.0.0.1"
));
protected int port;
protected String host;
protected HttpServer server;
protected LanguageToolHttpHandler httpHandler;
private boolean isRunning;
/**
* Start the server.
*/
public void run() {
String hostName = host != null ? host : "localhost";
ServerTools.print("Starting LanguageTool " + JLanguageTool.VERSION +
" (build date: " + JLanguageTool.BUILD_DATE + ", " + JLanguageTool.GIT_SHORT_ID + ") server on " + getProtocol() + "://" + hostName + ":" + port + "...");
server.start();
isRunning = true;
ServerTools.print("Server started");
}
/**
* Stop the server. Once stopped, a server cannot be used again.
*/
public void stop() {
if (httpHandler != null) {
httpHandler.shutdown();
}
if (server != null) {
ServerTools.print("Stopping server...");
server.stop(5);
isRunning = false;
ServerTools.print("Server stopped");
}
}
/**
* @return whether the server is running
* @since 2.0
*/
public boolean isRunning() {
return isRunning;
}
@Nullable
protected RequestLimiter getRequestLimiterOrNull(HTTPServerConfig config) {
int requestLimit = config.getRequestLimit();
int requestLimitInBytes = config.getRequestLimitInBytes();
int requestLimitPeriodInSeconds = config.getRequestLimitPeriodInSeconds();
int ipFingerprintFactor = config.getIpFingerprintFactor(); // can be <= 0, means fingerprinting is disabled
List requestLimitWhitelistUsers = config.getRequestLimitWhitelistUsers();
int requestLimitWhitelistLimit = config.getRequestLimitWhitelistLimit();
if ((requestLimit > 0 || requestLimitInBytes > 0) && requestLimitPeriodInSeconds > 0) {
return new RequestLimiter(requestLimit, requestLimitInBytes, requestLimitPeriodInSeconds, ipFingerprintFactor,
requestLimitWhitelistUsers, requestLimitWhitelistLimit);
}
return null;
}
@Nullable
protected ErrorRequestLimiter getErrorRequestLimiterOrNull(HTTPServerConfig config) {
int requestLimit = config.getTimeoutRequestLimit();
int requestLimitPeriodInSeconds = config.getRequestLimitPeriodInSeconds();
if (requestLimit > 0 && requestLimitPeriodInSeconds > 0) {
return new ErrorRequestLimiter(requestLimit, requestLimitPeriodInSeconds);
}
return null;
}
protected static boolean usageRequested(String[] args) {
return args.length == 1 && (args[0].equals("-h") || args[0].equals("--help"));
}
protected static void printCommonConfigFileOptions() {
System.out.println(" 'maxTextLength' - maximum text length, longer texts will cause an error (optional)");
System.out.println(" 'maxTextHardLength' - maximum text length, applies even to users with a special secret 'token' parameter (optional)");
System.out.println(" 'secretTokenKey' - secret JWT token key, if set by user and valid, maxTextLength can be increased by the user (optional)");
System.out.println(" 'maxCheckTimeMillis' - maximum time in milliseconds allowed per check (optional)");
System.out.println(" 'maxErrorsPerWordRate' - checking will stop with error if there are more rules matches per word (optional)");
System.out.println(" 'maxSpellingSuggestions' - only this many spelling errors will have suggestions for performance reasons (optional,\n" +
" affects Hunspell-based languages only)");
System.out.println(" 'maxCheckThreads' - maximum number of threads working in parallel (optional)");
System.out.println(" 'cacheSize' - size of internal cache in number of sentences (optional, default: 0)");
System.out.println(" 'cacheTTLSeconds' - how many seconds sentences are kept in cache (optional, default: 300 if 'cacheSize' is set)");
System.out.println(" 'requestLimit' - maximum number of requests per requestLimitPeriodInSeconds (optional)");
System.out.println(" 'requestLimitInBytes' - maximum aggregated size of requests per requestLimitPeriodInSeconds (optional)");
System.out.println(" 'timeoutRequestLimit' - maximum number of timeout request (optional)");
System.out.println(" 'requestLimitPeriodInSeconds' - time period to which requestLimit and timeoutRequestLimit applies (optional)");
System.out.println(" 'languageModel' - a directory with '1grams', '2grams', '3grams' sub directories which contain a Lucene index");
System.out.println(" each with ngram occurrence counts; activates the confusion rule if supported (optional)");
System.out.println(" 'word2vecModel' - a directory with word2vec data (optional), see");
System.out.println(" https://github.com/languagetool-org/languagetool/blob/master/languagetool-standalone/CHANGES.md#word2vec");
System.out.println(" 'fasttextModel' - a model file for better language detection (optional), see");
System.out.println(" https://fasttext.cc/docs/en/language-identification.html");
System.out.println(" 'fasttextBinary' - compiled fasttext executable for language detection (optional), see");
System.out.println(" https://fasttext.cc/docs/en/support.html");
System.out.println(" 'maxWorkQueueSize' - reject request if request queue gets larger than this (optional)");
System.out.println(" 'rulesFile' - a file containing rules configuration, such as .langugagetool.cfg (optional)");
System.out.println(" 'warmUp' - set to 'true' to warm up server at start, i.e. run a short check with all languages (optional)");
System.out.println(" 'blockedReferrers' - a comma-separated list of HTTP referrers (and 'Origin' headers) that are blocked and will not be served (optional)");
System.out.println(" 'disabledRuleIds' - a comma-separated list of rule ids that are turned off for this server (optional)");
System.out.println(" Spellcheck-only languages: You can add simple spellcheck-only support for languages that LT doesn't");
System.out.println(" support by defining two optional properties:");
System.out.println(" 'lang-xx' - set name of the language, use language code instead of 'xx', e.g. lang-tr=Turkish");
System.out.println(" 'lang-xx-dictPath' - absolute path to the hunspell .dic file, use language code instead of 'xx', e.g.");
System.out.println(" lang-tr-dictPath=/path/to/tr.dic. Note that the same directory also needs to");
System.out.println(" contain a common_words.txt file with the most common 10,000 words (used for better language detection)");
}
protected static void printCommonOptions() {
System.out.println(" --port, -p PRT port to bind to, defaults to " + DEFAULT_PORT + " if not specified");
System.out.println(" --public allow this server process to be connected from anywhere; if not set,");
System.out.println(" it can only be connected from the computer it was started on");
System.out.println(" --allow-origin ORIGIN set the Access-Control-Allow-Origin header in the HTTP response,");
System.out.println(" used for direct (non-proxy) JavaScript-based access from browsers;");
System.out.println(" example: --allow-origin \"*\"");
System.out.println(" --verbose, -v in case of exceptions, log the input text (up to 500 characters)");
System.out.println(" --languageModel a directory with '1grams', '2grams', '3grams' sub directories (per language)");
System.out.println(" which contain a Lucene index (optional, overwrites 'languageModel'");
System.out.println(" parameter in properties files)");
System.out.println(" --word2vecModel a directory with word2vec data (optional), see");
System.out.println(" https://github.com/languagetool-org/languagetool/blob/master/languagetool-standalone/CHANGES.md#word2vec");
}
protected static void checkForNonRootUser() {
if ("root".equals(System.getProperty("user.name"))) {
ServerTools.print("****************************************************************************************************");
ServerTools.print("*** WARNING: this process is running as root - please do not run it as root for security reasons ***");
ServerTools.print("****************************************************************************************************");
}
}
protected ThreadPoolExecutor getExecutorService(LinkedBlockingQueue workQueue, HTTPServerConfig config) {
int threadPoolSize = config.getMaxCheckThreads();
ServerTools.print("Setting up thread pool with " + threadPoolSize + " threads");
return new StoppingThreadPoolExecutor(threadPoolSize, workQueue);
}
static class StoppingThreadPoolExecutor extends ThreadPoolExecutor {
StoppingThreadPoolExecutor(int threadPoolSize, LinkedBlockingQueue workQueue) {
super(threadPoolSize, threadPoolSize, 0L, TimeUnit.MILLISECONDS, workQueue,
new ThreadFactoryBuilder().setNameFormat("lt-server-thread-%d").build());
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
if (t != null && t instanceof OutOfMemoryError) {
// we prefer to stop instead of being in an unstable state:
//noinspection CallToPrintStackTrace
t.printStackTrace();
System.exit(1);
}
}
}
}
