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/*
This file is part of GNUnet.
(C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.util;
import org.apache.log4j.*;
import org.gnunet.util.getopt.Option;
import org.gnunet.util.getopt.OptionAction;
import org.gnunet.util.getopt.Parser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
/**
* Program is the entry point class for everything that uses gnunet services or APIs.
*
* @see Service
*/
public abstract class Program {
private static final Logger logger = LoggerFactory
.getLogger(Program.class);
protected final Configuration cfg = new Configuration();
@Option(shortname = "c", longname = "config",
description = "Path of the configuration file",
argumentName = "FILENAME",
action = OptionAction.STORE_STRING)
public String cfgFileName;
@Option(shortname = "h", longname = "help",
description = "print this help message",
action = OptionAction.SET)
public boolean printHelp;
@Option(shortname = "v", longname = "version",
description = "print version",
action = OptionAction.SET)
public boolean showVersion;
@Option(shortname = "L", longname = "log",
description = "configure logging to use LOGLEVEL",
argumentName = "LOGLEVEL",
action = OptionAction.STORE_STRING)
public String logLevel;
@Option(shortname = "l", longname = "logfile",
description = "configure logging to write logs to LOGFILE",
argumentName = "LOGFILE",
action = OptionAction.STORE_STRING)
public String logFile;
protected String[] unprocessedArgs;
private final String[] args;
/**
* A program with the desired environment for a gnunet utility.
* While executing the scheduler is guaranteed to run, command arguments are parsed,
* the default configuration is loaded and the DNS Resolver is initialized.
*
* @param args array of command line arguments to parse. used to automatically load additional settings
* and configure log levels.
*/
public Program(String... args) {
this.args = args;
/*
* Remember: We can't parse command line arguments here, as java's initialization order
* dictates that member variables of subclasses are initialized *after* the superclass constructor (here).
*/
}
public static void configureLogging(String logLevel, String logFile) {
org.apache.log4j.Logger rootLogger = LogManager.getRootLogger();
rootLogger.removeAllAppenders();
// %c{2}: category 2 levels
Layout layout = new PatternLayout("%d{dd MMM yyyy HH:mm:ss-SSS} %c{2} %p: %m%n");
if (logFile == null) {
rootLogger.addAppender(new ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT));
} else {
Appender appender = null;
try {
appender = new FileAppender(layout, logFile);
} catch (IOException e) {
logger.warn("could not open log file {}", logFile);
}
if (appender!= null) {
rootLogger.removeAllAppenders();
rootLogger.addAppender(appender);
}
}
if (logLevel == null) {
rootLogger.setLevel(Level.INFO);
} else if (logLevel.equalsIgnoreCase("debug")) {
rootLogger.setLevel(Level.DEBUG);
} else if (logLevel.equalsIgnoreCase("info")) {
rootLogger.setLevel(Level.INFO);
} else if (logLevel.equalsIgnoreCase("warn") || logLevel.equalsIgnoreCase("warning")) {
rootLogger.setLevel(Level.WARN);
} else if (logLevel.equalsIgnoreCase("error")) {
rootLogger.setLevel(Level.ERROR);
} else if (logLevel.equalsIgnoreCase("off")) {
rootLogger.setLevel(Level.OFF);
} else {
rootLogger.setLevel(Level.INFO);
logger.info("unknown log level '{}'; defaulting to INFO", logLevel);
}
}
/**
* Override to display a different help text on "-h/--help"
*
* @return the help text
*/
protected String makeHelpText() {
return "gnunet-java tool";
}
/**
* Override to display a different version description on "-h/--help"
*
* @return version description
*/
protected String makeVersionDescription() {
return "development version of gnunet-java";
}
/**
* Start the Program as the initial task of the Scheduler.
*/
public void start() {
Parser optParser = new Parser(this);
unprocessedArgs = optParser.parse(args);
configureLogging(logLevel, logFile);
cfg.loadDefaults();
if (cfgFileName != null) {
cfg.parse(cfgFileName);
}
Resolver.getInstance().setConfiguration(cfg);
if (showVersion) {
System.out.println(makeVersionDescription());
} else if (printHelp) {
System.out.println(makeHelpText());
System.out.print(optParser.getHelp());
} else {
Scheduler.run(new Scheduler.Task() {
public void run(Scheduler.RunContext c) {
Program.this.run();
}
});
}
}
/**
* Override to implement the behavior of the Program.
*/
public abstract void run();
public final Configuration getConfiguration() {
return cfg;
}
}
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