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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic.pattern;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.spi.IThrowableProxy;
import ch.qos.logback.classic.spi.StackTraceElementProxy;
import ch.qos.logback.classic.spi.ThrowableProxyUtil;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.boolex.EvaluationException;
import ch.qos.logback.core.boolex.EventEvaluator;
import ch.qos.logback.core.status.ErrorStatus;
/**
* Add a stack trace in case the event contains a Throwable.
*
* @author Ceki Gülcü
*/
public class ThrowableProxyConverter extends ThrowableHandlingConverter {
protected static final int BUILDER_CAPACITY = 2048;
int lengthOption;
List> evaluatorList = null;
List ignoredStackTraceLines = null;
int errorCount = 0;
@SuppressWarnings("unchecked")
public void start() {
String lengthStr = getFirstOption();
if (lengthStr == null) {
lengthOption = Integer.MAX_VALUE;
} else {
lengthStr = lengthStr.toLowerCase();
if ("full".equals(lengthStr)) {
lengthOption = Integer.MAX_VALUE;
} else if ("short".equals(lengthStr)) {
lengthOption = 1;
} else {
try {
lengthOption = Integer.parseInt(lengthStr);
} catch (NumberFormatException nfe) {
addError("Could not parse [" + lengthStr + "] as an integer");
lengthOption = Integer.MAX_VALUE;
}
}
}
final List optionList = getOptionList();
if (optionList != null && optionList.size() > 1) {
final int optionListSize = optionList.size();
for (int i = 1; i < optionListSize; i++) {
String evaluatorOrIgnoredStackTraceLine = (String) optionList.get(i);
Context context = getContext();
Map> evaluatorMap = (Map>) context.getObject(CoreConstants.EVALUATOR_MAP);
EventEvaluator ee = (EventEvaluator) evaluatorMap.get(evaluatorOrIgnoredStackTraceLine);
if (ee != null) {
addEvaluator(ee);
} else {
addIgnoreStackTraceLine(evaluatorOrIgnoredStackTraceLine);
}
}
}
super.start();
}
private void addEvaluator(EventEvaluator ee) {
if (evaluatorList == null) {
evaluatorList = new ArrayList>();
}
evaluatorList.add(ee);
}
private void addIgnoreStackTraceLine(String ignoredStackTraceLine) {
if (ignoredStackTraceLines == null) {
ignoredStackTraceLines = new ArrayList();
}
ignoredStackTraceLines.add(ignoredStackTraceLine);
}
public void stop() {
evaluatorList = null;
super.stop();
}
protected void extraData(StringBuilder builder, StackTraceElementProxy step) {
// nop
}
public String convert(ILoggingEvent event) {
IThrowableProxy tp = event.getThrowableProxy();
if (tp == null) {
return CoreConstants.EMPTY_STRING;
}
// an evaluator match will cause stack printing to be skipped
if (evaluatorList != null) {
boolean printStack = true;
for (int i = 0; i < evaluatorList.size(); i++) {
EventEvaluator ee = evaluatorList.get(i);
try {
if (ee.evaluate(event)) {
printStack = false;
break;
}
} catch (EvaluationException eex) {
errorCount++;
if (errorCount < CoreConstants.MAX_ERROR_COUNT) {
addError("Exception thrown for evaluator named [" + ee.getName() + "]", eex);
} else if (errorCount == CoreConstants.MAX_ERROR_COUNT) {
ErrorStatus errorStatus = new ErrorStatus("Exception thrown for evaluator named [" + ee.getName() + "].", this, eex);
errorStatus.add(new ErrorStatus("This was the last warning about this evaluator's errors."
+ "We don't want the StatusManager to get flooded.", this));
addStatus(errorStatus);
}
}
}
if (!printStack) {
return CoreConstants.EMPTY_STRING;
}
}
return throwableProxyToString(tp);
}
protected String throwableProxyToString(IThrowableProxy tp) {
StringBuilder sb = new StringBuilder(BUILDER_CAPACITY);
recursiveAppend(sb, null, ThrowableProxyUtil.REGULAR_EXCEPTION_INDENT, tp);
return sb.toString();
}
private void recursiveAppend(StringBuilder sb, String prefix, int indent, IThrowableProxy tp) {
if (tp == null)
return;
subjoinFirstLine(sb, prefix, indent, tp);
sb.append(CoreConstants.LINE_SEPARATOR);
subjoinSTEPArray(sb, indent, tp);
IThrowableProxy[] suppressed = tp.getSuppressed();
if (suppressed != null) {
for (IThrowableProxy current : suppressed) {
recursiveAppend(sb, CoreConstants.SUPPRESSED, indent + ThrowableProxyUtil.SUPPRESSED_EXCEPTION_INDENT, current);
}
}
recursiveAppend(sb, CoreConstants.CAUSED_BY, indent, tp.getCause());
}
private void subjoinFirstLine(StringBuilder buf, String prefix, int indent, IThrowableProxy tp) {
ThrowableProxyUtil.indent(buf, indent - 1);
if (prefix != null) {
buf.append(prefix);
}
subjoinExceptionMessage(buf, tp);
}
private void subjoinExceptionMessage(StringBuilder buf, IThrowableProxy tp) {
buf.append(tp.getClassName()).append(": ").append(tp.getMessage());
}
protected void subjoinSTEPArray(StringBuilder buf, int indent, IThrowableProxy tp) {
StackTraceElementProxy[] stepArray = tp.getStackTraceElementProxyArray();
int commonFrames = tp.getCommonFrames();
boolean unrestrictedPrinting = lengthOption > stepArray.length;
int maxIndex = (unrestrictedPrinting) ? stepArray.length : lengthOption;
if (commonFrames > 0 && unrestrictedPrinting) {
maxIndex -= commonFrames;
}
int ignoredCount = 0;
for (int i = 0; i < maxIndex; i++) {
StackTraceElementProxy element = stepArray[i];
if (!isIgnoredStackTraceLine(element.toString())) {
ThrowableProxyUtil.indent(buf, indent);
printStackLine(buf, ignoredCount, element);
ignoredCount = 0;
buf.append(CoreConstants.LINE_SEPARATOR);
} else {
++ignoredCount;
if (maxIndex < stepArray.length) {
++maxIndex;
}
}
}
if (ignoredCount > 0) {
printIgnoredCount(buf, ignoredCount);
buf.append(CoreConstants.LINE_SEPARATOR);
}
if (commonFrames > 0 && unrestrictedPrinting) {
ThrowableProxyUtil.indent(buf, indent);
buf.append("... ").append(tp.getCommonFrames()).append(" common frames omitted").append(CoreConstants.LINE_SEPARATOR);
}
}
private void printStackLine(StringBuilder buf, int ignoredCount, StackTraceElementProxy element) {
buf.append(element);
extraData(buf, element); // allow other data to be added
if (ignoredCount > 0) {
printIgnoredCount(buf, ignoredCount);
}
}
private void printIgnoredCount(StringBuilder buf, int ignoredCount) {
buf.append(" [").append(ignoredCount).append(" skipped]");
}
private boolean isIgnoredStackTraceLine(String line) {
if (ignoredStackTraceLines != null) {
for (String ignoredStackTraceLine : ignoredStackTraceLines) {
if (line.contains(ignoredStackTraceLine)) {
return true;
}
}
}
return false;
}
}