/
GetStaticCommand.java
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/
GetStaticCommand.java
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package com.taobao.arthas.core.command.klass100;
import com.alibaba.arthas.deps.org.slf4j.Logger;
import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
import com.taobao.arthas.core.command.Constants;
import com.taobao.arthas.core.command.express.ExpressException;
import com.taobao.arthas.core.command.express.ExpressFactory;
import com.taobao.arthas.core.command.model.ClassVO;
import com.taobao.arthas.core.command.model.ClassLoaderVO;
import com.taobao.arthas.core.command.model.GetStaticModel;
import com.taobao.arthas.core.command.model.MessageModel;
import com.taobao.arthas.core.command.model.RowAffectModel;
import com.taobao.arthas.core.shell.command.AnnotatedCommand;
import com.taobao.arthas.core.shell.command.CommandProcess;
import com.taobao.arthas.core.shell.command.ExitStatus;
import com.taobao.arthas.core.util.ClassUtils;
import com.taobao.arthas.core.util.ClassLoaderUtils;
import com.taobao.arthas.core.util.CommandUtils;
import com.taobao.arthas.core.util.SearchUtils;
import com.taobao.arthas.core.util.StringUtils;
import com.taobao.arthas.core.util.affect.RowAffect;
import com.taobao.arthas.core.util.matcher.Matcher;
import com.taobao.arthas.core.util.matcher.RegexMatcher;
import com.taobao.arthas.core.util.matcher.WildcardMatcher;
import com.taobao.middleware.cli.annotations.Argument;
import com.taobao.middleware.cli.annotations.Description;
import com.taobao.middleware.cli.annotations.Name;
import com.taobao.middleware.cli.annotations.Option;
import com.taobao.middleware.cli.annotations.Summary;
import java.lang.instrument.Instrumentation;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.List;
import java.util.Set;
import java.util.Collection;
/**
* @author diecui1202 on 2017/9/27.
*/
@Name("getstatic")
@Summary("Show the static field of a class")
@Description(Constants.EXAMPLE +
" getstatic demo.MathGame random\n" +
" getstatic -c 39eb305e org.apache.log4j.LogManager DEFAULT_CONFIGURATION_FILE\n" +
Constants.WIKI + Constants.WIKI_HOME + "getstatic")
public class GetStaticCommand extends AnnotatedCommand {
private static final Logger logger = LoggerFactory.getLogger(GetStaticCommand.class);
private String classPattern;
private String fieldPattern;
private String express;
private String hashCode = null;
private String classLoaderClass;
private boolean isRegEx = false;
private int expand = 1;
@Argument(argName = "class-pattern", index = 0)
@Description("Class name pattern, use either '.' or '/' as separator")
public void setClassPattern(String classPattern) {
this.classPattern = classPattern;
}
@Argument(argName = "field-pattern", index = 1)
@Description("Field name pattern")
public void setFieldPattern(String fieldPattern) {
this.fieldPattern = fieldPattern;
}
@Argument(argName = "express", index = 2, required = false)
@Description("the content you want to watch, written by ognl")
public void setExpress(String express) {
this.express = express;
}
@Option(shortName = "c", longName = "classloader")
@Description("The hash code of the special class's classLoader")
public void setHashCode(String hashCode) {
this.hashCode = hashCode;
}
@Option(longName = "classLoaderClass")
@Description("The class name of the special class's classLoader.")
public void setClassLoaderClass(String classLoaderClass) {
this.classLoaderClass = classLoaderClass;
}
@Option(shortName = "E", longName = "regex", flag = true)
@Description("Enable regular expression to match (wildcard matching by default)")
public void setRegEx(boolean regEx) {
isRegEx = regEx;
}
@Option(shortName = "x", longName = "expand")
@Description("Expand level of object (1 by default)")
public void setExpand(Integer expand) {
this.expand = expand;
}
@Override
public void process(CommandProcess process) {
RowAffect affect = new RowAffect();
Instrumentation inst = process.session().getInstrumentation();
if (hashCode == null && classLoaderClass != null) {
List<ClassLoader> matchedClassLoaders = ClassLoaderUtils.getClassLoaderByClassName(inst, classLoaderClass);
if (matchedClassLoaders.size() == 1) {
hashCode = Integer.toHexString(matchedClassLoaders.get(0).hashCode());
} else if (matchedClassLoaders.size() > 1) {
Collection<ClassLoaderVO> classLoaderVOList = ClassUtils.createClassLoaderVOList(matchedClassLoaders);
GetStaticModel getStaticModel = new GetStaticModel()
.setClassLoaderClass(classLoaderClass)
.setMatchedClassLoaders(classLoaderVOList);
process.appendResult(getStaticModel);
process.end(-1, "Found more than one classloader by class name, please specify classloader with '-c <classloader hash>'");
return;
} else {
process.end(-1, "Can not find classloader by class name: " + classLoaderClass + ".");
return;
}
}
Set<Class<?>> matchedClasses = SearchUtils.searchClassOnly(inst, classPattern, isRegEx, hashCode);
try {
if (matchedClasses == null || matchedClasses.isEmpty()) {
process.end(-1, "No class found for: " + classPattern);
return;
}
ExitStatus status = null;
if (matchedClasses.size() > 1) {
status = processMatches(process, matchedClasses);
} else {
status = processExactMatch(process, affect, inst, matchedClasses);
}
process.appendResult(new RowAffectModel(affect));
CommandUtils.end(process, status);
} catch (Throwable e){
logger.error("processing error", e);
process.appendResult(new RowAffectModel(affect));
process.end(-1, "processing error");
}
}
private ExitStatus processExactMatch(CommandProcess process, RowAffect affect, Instrumentation inst,
Set<Class<?>> matchedClasses) {
Matcher<String> fieldNameMatcher = fieldNameMatcher();
Class<?> clazz = matchedClasses.iterator().next();
boolean found = false;
for (Field field : clazz.getDeclaredFields()) {
if (!Modifier.isStatic(field.getModifiers()) || !fieldNameMatcher.matching(field.getName())) {
continue;
}
if (!field.isAccessible()) {
field.setAccessible(true);
}
try {
Object value = field.get(null);
if (!StringUtils.isEmpty(express)) {
value = ExpressFactory.threadLocalExpress(value).get(express);
}
process.appendResult(new GetStaticModel(field.getName(), value, expand));
affect.rCnt(1);
} catch (IllegalAccessException e) {
logger.warn("getstatic: failed to get static value, class: {}, field: {} ", clazz, field.getName(), e);
process.appendResult(new MessageModel("Failed to get static, exception message: " + e.getMessage()
+ ", please check $HOME/logs/arthas/arthas.log for more details. "));
} catch (ExpressException e) {
logger.warn("getstatic: failed to get express value, class: {}, field: {}, express: {}", clazz, field.getName(), express, e);
process.appendResult(new MessageModel("Failed to get static, exception message: " + e.getMessage()
+ ", please check $HOME/logs/arthas/arthas.log for more details. "));
} finally {
found = true;
}
}
if (!found) {
return ExitStatus.failure(-1, "getstatic: no matched static field was found");
} else {
return ExitStatus.success();
}
}
private ExitStatus processMatches(CommandProcess process, Set<Class<?>> matchedClasses) {
// Element usage = new LabelElement("getstatic -c <hashcode> " + classPattern + " " + fieldPattern).style(
// Decoration.bold.fg(Color.blue));
// process.write("\n Found more than one class for: " + classPattern + ", Please use " + RenderUtil.render(usage, process.width()));
//TODO support message style
String usage = "getstatic -c <hashcode> " + classPattern + " " + fieldPattern;
process.appendResult(new MessageModel("Found more than one class for: " + classPattern + ", Please use: "+usage));
List<ClassVO> matchedClassVOs = ClassUtils.createClassVOList(matchedClasses);
process.appendResult(new GetStaticModel(matchedClassVOs));
return ExitStatus.failure(-1, "Found more than one class for: " + classPattern + ", Please use: "+usage);
}
private Matcher<String> fieldNameMatcher() {
return isRegEx ? new RegexMatcher(fieldPattern) : new WildcardMatcher(fieldPattern);
}
}