/*
* 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.apache.karaf.log.command;
import java.io.PrintStream;
import org.apache.karaf.log.core.LogEventFormatter;
import org.apache.karaf.log.core.LogService;
import org.apache.karaf.shell.api.action.Action;
import org.apache.karaf.shell.api.action.Argument;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.Completion;
import org.apache.karaf.shell.api.action.Option;
import org.apache.karaf.shell.api.action.lifecycle.Reference;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.support.completers.StringsCompleter;
import org.ops4j.pax.logging.spi.PaxLoggingEvent;
/**
* Displays the last log entries
*/
@Command(scope = "log", name = "display", description = "Displays log entries.")
@Service
public class DisplayLog implements Action {
public final static int ERROR_INT = 3;
public final static int WARN_INT = 4;
public final static int INFO_INT = 6;
public final static int DEBUG_INT = 7;
@Option(name = "-n", aliases = {}, description="Number of entries to display", required = false, multiValued = false)
int entries;
@Option(name = "-p", aliases = {}, description="Pattern for formatting the output", required = false, multiValued = false)
String overridenPattern;
@Option(name = "--no-color", description="Disable syntax coloring of log events", required = false, multiValued = false)
boolean noColor;
@Option(name = "-l", aliases = { "--level" }, description = "The minimal log level to display", required = false, multiValued = false)
@Completion(value = StringsCompleter.class, values = { "TRACE", "DEBUG", "INFO", "WARN", "ERROR", "DEFAULT" })
String level;
@Argument(index = 0, name = "logger", description = "The name of the logger. This can be ROOT, ALL, or the name of a logger specified in the org.ops4j.pax.logger.cfg file.", required = false, multiValued = false)
String logger;
@Reference
LogService logService;
@Reference
LogEventFormatter formatter;
@Override
public Object execute() throws Exception {
int minLevel = getMinLevel(level);
final PrintStream out = System.out;
Iterable<PaxLoggingEvent> le = logService.getEvents(entries == 0 ? Integer.MAX_VALUE : entries);
for (PaxLoggingEvent event : le) {
printEvent(out, event, minLevel);
}
out.println();
return null;
}
protected static int getMinLevel(String levelSt) {
int minLevel = Integer.MAX_VALUE;
if (levelSt != null) {
switch (levelSt.toLowerCase()) {
case "debug": minLevel = DEBUG_INT; break;
case "info": minLevel = INFO_INT; break;
case "warn": minLevel = WARN_INT; break;
case "error": minLevel = ERROR_INT; break;
}
}
return minLevel;
}
protected boolean checkIfFromRequestedLog(PaxLoggingEvent event) {
return event.getLoggerName().contains(logger);
}
protected void printEvent(PrintStream out, PaxLoggingEvent event, int minLevel) {
try {
if (event != null) {
int sl = event.getLevel().getSyslogEquivalent();
if (sl <= minLevel) {
printEvent(out, event);
}
}
} catch (NoClassDefFoundError e) {
// KARAF-3350: Ignore NoClassDefFoundError exceptions
// Those exceptions may happen if the underlying pax-logging service
// bundle has been refreshed somehow.
}
}
protected void printEvent(final PrintStream out, PaxLoggingEvent event) {
if ((logger != null) &&
(event != null) &&
(checkIfFromRequestedLog(event))) {
out.append(formatter.format(event, overridenPattern, noColor));
} else if ((event != null) && (logger == null)) {
out.append(formatter.format(event, overridenPattern, noColor));
}
}
}