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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// $Id$
package com.yahoo.log;
import com.yahoo.log.event.Event;
import com.yahoo.log.impl.LogUtils;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This class implements a log formatter which takes care of
* formatting messages according to the VESPA common log format.
*
* @author Bjorn Borud
* @author arnej27959
*
*/
class VespaFormatter extends SimpleFormatter {
private static final Pattern backSlash = Pattern.compile("\\\\");
// other way around
private static final Pattern backSlashN = Pattern.compile("\\\\n");
private static final Pattern backSlashT = Pattern.compile("\\\\t");
private static final Pattern backSlash2 = Pattern.compile("\\\\\\\\");
private static final String hostname;
private static final String processID;
public static final String serviceNameUnsetValue = "-";
static {
hostname = LogUtils.getHostName();
processID = LogUtils.getPID();
}
private String serviceName;
private final String componentPrefix;
/**
* Default constructor
*/
public VespaFormatter() {
this.serviceName = serviceNameUnsetValue;
this.componentPrefix = null;
}
/**
* @param serviceName The VESPA service name.
* @param componentPrefix The application name.
*/
public VespaFormatter(String serviceName, String componentPrefix) {
if (serviceName == null) {
this.serviceName = serviceNameUnsetValue;
} else {
this.serviceName = serviceName;
}
this.componentPrefix = componentPrefix;
}
/**
* Un-escapes previously escaped string.
* note: look at com.yahoo.config.StringNode.unescapeQuotedString()
*
* @param s String that might need un-escaping
* @return Returns un-escaped string
*/
public static String unEscape(String s) {
Matcher m = backSlash.matcher(s);
if (! m.find()) {
return s;
}
m = backSlashN.matcher(s);
if (m.find()) {
s = m.replaceAll("\n");
}
m = backSlashT.matcher(s);
if (m.find()) {
s = m.replaceAll("\t");
}
m = backSlash2.matcher(s);
if (m.find()) {
s = m.replaceAll("\\\\");
}
return s;
}
@SuppressWarnings("deprecation")
public String format(LogRecord r) {
StringBuilder sbuf = new StringBuilder(300); // initial guess
String levelName = LogLevel.getVespaLogLevel(r.getLevel()).toString().toLowerCase();
String component = r.getLoggerName();
// format the time
sbuf.append(VespaFormat.formatTime(r.getInstant()));
sbuf.append("\t");
sbuf.append(hostname).append("\t")
.append(processID).append("/")
.append(r.getThreadID()).append("\t")
.append(serviceName).append("\t");
if (component == null && componentPrefix == null) {
sbuf.append("-");
} else if (component == null) {
sbuf.append(componentPrefix);
} else if (componentPrefix == null) {
sbuf.append(".").append(component);
} else {
sbuf.append(componentPrefix).append(".").append(component);
}
sbuf.append("\t").append(levelName).append("\t");
// for events, there is no ordinary message string;
// instead we render a string represantion of the event object:
if (r.getLevel() == LogLevel.EVENT) {
Event event = (Event) r.getParameters()[0];
sbuf.append(VespaFormat.escape(event.toString()));
} else {
// otherwise, run standard java text formatting on the message
sbuf.append(VespaFormat.escape(formatMessage(r)));
}
appendException(r.getThrown(), sbuf);
sbuf.append("\n");
return sbuf.toString();
}
private void appendException(Throwable throwable, StringBuilder builder) {
if (throwable == null)
return;
String escapedStackTrace = VespaFormat.escape(stackTrace(throwable));
builder.append("\\n").append("exception=").append("\\n").append(escapedStackTrace);
}
private String stackTrace(Throwable throwable) {
StringWriter writer = new StringWriter();
PrintWriter wrappedWriter = new PrintWriter(writer);
throwable.printStackTrace(wrappedWriter);
wrappedWriter.close();
return writer.toString();
}
/**
* Set the service name (usually the VESPA config-id) of this
* formatter.
*
* @param serviceName The service name
*/
public void setServiceName (String serviceName) {
this.serviceName = serviceName;
}
/**
* Get the service name for this formatter.
*
* @return Returns the service name.
*/
public String getServiceName () {
return serviceName;
}
public static String toMessageString(Throwable t) {
StringBuilder b = new StringBuilder();
String lastMessage = null;
String message;
for (; t != null; t = t.getCause()) {
message = getMessage(t);
if (message == null) continue;
if (message.equals(lastMessage)) continue;
if (b.length() > 0) {
b.append(": ");
}
b.append(message);
lastMessage = message;
}
return b.toString();
}
/** Returns a useful message from *this* exception, or null if there is nothing useful to return */
private static String getMessage(Throwable t) {
String message = t.getMessage();
if (t.getCause() == null) {
if (message == null) return t.getClass().getSimpleName();
}
return message;
}
}
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