robust原理解析

robust原理解析
接上一篇
robust使用

打基础包的时候，每个类都会被添加

public static ChangeQuickRedirect u;静态成员变量

查看这个类的源码发现这个是一个接口

public interface ChangeQuickRedirect {Object accessDispatch(String methodName, Object[] paramArrayOfObject);boolean isSupport(String methodName, Object[] paramArrayOfObject);
}

反编译基本包能看到每个方法当中都被添加了这个判断

 public static PatchProxyResult proxy(Object[] paramsArray, Object current, ChangeQuickRedirect changeQuickRedirect, boolean isStatic, int methodNumber, Class[] paramsClassTypes, Class returnType) {PatchProxyResult patchProxyResult = new PatchProxyResult();if (PatchProxy.isSupport(paramsArray, current, changeQuickRedirect, isStatic, methodNumber, paramsClassTypes, returnType)) {patchProxyResult.isSupported = true;patchProxyResult.result = PatchProxy.accessDispatch(paramsArray, current, changeQuickRedirect, isStatic, methodNumber, paramsClassTypes, returnType);}return patchProxyResult;}public static boolean isSupport(Object[] paramsArray, Object current, ChangeQuickRedirect changeQuickRedirect, boolean isStatic, int methodNumber, Class[] paramsClassTypes, Class returnType) {//Robust补丁优先执行，其他功能靠后if (changeQuickRedirect == null) {//不执行补丁，轮询其他监听者if (registerExtensionList == null || registerExtensionList.isEmpty()) {return false;}for (RobustExtension robustExtension : registerExtensionList) {if (robustExtension.isSupport(new RobustArguments(paramsArray, current, isStatic, methodNumber, paramsClassTypes, returnType))) {robustExtensionThreadLocal.set(robustExtension);return true;}}return false;}String classMethod = getClassMethod(isStatic, methodNumber);if (TextUtils.isEmpty(classMethod)) {return false;}Object[] objects = getObjects(paramsArray, current, isStatic);try {return changeQuickRedirect.isSupport(classMethod, objects);} catch (Throwable t) {return false;}}

如果PatchProxy.isSupport返回true

就执行PatchProxy.accessDispatch

查看源码

public static Object accessDispatch(Object[] paramsArray, Object current, ChangeQuickRedirect changeQuickRedirect, boolean isStatic, int methodNumber, Class[] paramsClassTypes, Class returnType) {if (changeQuickRedirect == null) {RobustExtension robustExtension = robustExtensionThreadLocal.get();robustExtensionThreadLocal.remove();if (robustExtension != null) {notify(robustExtension.describeSelfFunction());return robustExtension.accessDispatch(new RobustArguments(paramsArray, current, isStatic, methodNumber, paramsClassTypes, returnType));}return null;}String classMethod = getClassMethod(isStatic, methodNumber);if (TextUtils.isEmpty(classMethod)) {return null;}notify(Constants.PATCH_EXECUTE);Object[] objects = getObjects(paramsArray, current, isStatic);return changeQuickRedirect.accessDispatch(classMethod, objects);}

最后调用的就是changeQuickRedirect的accessDispatch

那实际调用的就是这个接口的实现类的方法

接下来看补丁文件

PatchesInfoImpl

根据我的上篇使用文章，我反编译出patchesinfoimpl的代码为

public class PatchesInfoImpl implements PatchesInfo {public List getPatchedClassesInfo() {ArrayList<PatchedClassInfo> arrayList = new ArrayList();arrayList.add(new PatchedClassInfo("com.freebrio.robustdemo.MainActivity", "com.freebrio.robustdemo.MainActivityPatchControl"));EnhancedRobustUtils.isThrowable = false;return arrayList;}
}

里面列出了我修改的类和对应的修改方法

MainActivity ->MainActivityPatchControl

打开这个类

package com.freebrio.robustdemo;import android.view.View;
import com.meituan.robust.ChangeQuickRedirect;
import java.util.Map;
import java.util.WeakHashMap;public class MainActivityPatchControl implements ChangeQuickRedirect {public static final String MATCH_ALL_PARAMETER = "(\\w*\\.)*\\w*";private static final Map<Object, Object> keyToValueRelation = new WeakHashMap<Object, Object>();private static Object fixObj(Object paramObject) {Object object = paramObject;if (paramObject instanceof Byte) {boolean bool;if (((Byte)paramObject).byteValue() != 0) {bool = true;} else {bool = false;} object = new Boolean(bool);} return object;}public Object accessDispatch(String paramString, Object[] paramArrayOfObject) {try {MainActivityPatch mainActivityPatch;if (paramString.split(":")[2].equals("false")) {if (keyToValueRelation.get(paramArrayOfObject[paramArrayOfObject.length - 1]) == null) {mainActivityPatch = new MainActivityPatch(paramArrayOfObject[paramArrayOfObject.length - 1]);keyToValueRelation.put(paramArrayOfObject[paramArrayOfObject.length - 1], null);} else {mainActivityPatch = (MainActivityPatch)keyToValueRelation.get(paramArrayOfObject[paramArrayOfObject.length - 1]);} } else {mainActivityPatch = new MainActivityPatch(null);} if ("5".equals(paramString.split(":")[3])) {mainActivityPatch.setTV((View)paramArrayOfObject[0]);return null;} } catch (Throwable throwable) {throwable.printStackTrace();return null;} return null;}public Object getRealParameter(Object paramObject) {Object object = paramObject;if (paramObject instanceof MainActivity)object = new MainActivityPatch(paramObject); return object;}public boolean isSupport(String paramString, Object[] paramArrayOfObject) {paramString = paramString.split(":")[3];return ":5:".contains(":" + paramString + ":");}
}

他实现的就是ChangeQuickRedirect

也就是说如果ChangeQuickRedirect不等于null那就会执行MainActivityPatchControl中的accessDispatch

可以看到这一行关键代码

if ("5".equals(paramString.split(":")[3])) {mainActivityPatch.setTV((View)paramArrayOfObject[0]);return null;}

在mainactivitypatch的settv方法中

public final void setTV(View paramView) {MainActivityPatch mainActivityPatch;MainActivity mainActivity1;CharSequence charSequence;MainActivity mainActivity2;new IntrinsicsInLinePatch(getRealParameter(new Object[] { null })[0]);EnhancedRobustUtils.invokeReflectStaticMethod("checkParameterIsNotNull", IntrinsicsInLinePatch.class, getRealParameter(new Object[] { paramView, "view" }, ), new Class[] { Object.class, String.class });if (this instanceof MainActivityPatch) {mainActivity1 = this.originClass;} else {mainActivityPatch = this;} TextView textView2 = (TextView)EnhancedRobustUtils.getFieldValue("q", mainActivityPatch, MainActivity.class);if (textView2 == null) {new IntrinsicsInLinePatch(getRealParameter(new Object[] { null })[0]);EnhancedRobustUtils.invokeReflectStaticMethod("throwUninitializedPropertyAccessException", IntrinsicsInLinePatch.class, getRealParameter(new Object[] { "textView" }, ), new Class[] { String.class });} String str = (String)EnhancedRobustUtils.invokeReflectMethod("getString1", new MainActivityInLinePatch(getRealParameter(new Object[] { this }, )[0]), getRealParameter(new Object[0]), null, null);if (str == this) {mainActivity1 = ((MainActivityPatch)str).originClass;} else {charSequence = (CharSequence)mainActivity1;} TextView textView1 = textView2;if (textView2 == this)mainActivity2 = ((MainActivityPatch)textView2).originClass; EnhancedRobustUtils.invokeReflectMethod("setText", mainActivity2, getRealParameter(new Object[] { charSequence }, ), new Class[] { CharSequence.class }, TextView.class);}

可以看到这一行关键代码

String str = (String)EnhancedRobustUtils.invokeReflectMethod("getString1", new MainActivityInLinePatch(getRealParameter(new Object[] { this }, )[0]), getRealParameter(new Object[0]), null, null);

最后调用的是我修改后的getString1方法，达到了修复的目的

接下来看一下加载过程

new PatchExecutor(getApplicationContext(), new PatchManipulateImp(),  new Callback()).start();

在PatchExecutor的patch方法中


ClassLoader classLoader = null;try {File dexOutputDir = getPatchCacheDirPath(context, patch.getName() + patch.getMd5());classLoader = new DexClassLoader(patch.getTempPath(), dexOutputDir.getAbsolutePath(),null, PatchExecutor.class.getClassLoader());} catch (Throwable throwable) {throwable.printStackTrace();}if (null == classLoader) {return false;}try {Log.d("robust", "patch patch_info_name:" + patch.getPatchesInfoImplClassFullName());patchesInfoClass = classLoader.loadClass(patch.getPatchesInfoImplClassFullName());patchesInfo = (PatchesInfo) patchesInfoClass.newInstance();} catch (Throwable t) {Log.e("robust", "patch failed 188 ", t);}Field[] fields = sourceClass.getDeclaredFields();Log.d("robust", "oldClass :" + sourceClass + "     fields " + fields.length);Field changeQuickRedirectField = null;for (Field field : fields) {if (TextUtils.equals(field.getType().getCanonicalName(), ChangeQuickRedirect.class.getCanonicalName()) && TextUtils.equals(field.getDeclaringClass().getCanonicalName(), sourceClass.getCanonicalName())) {changeQuickRedirectField = field;break;}}

创建了DexClassLoader，根据dexclassloader去加载dex文件，

classLoader.loadClass(patch.getPatchesInfoImplClassFullName())

getPatchesInfoImplClassFullName就是PatchesInfoImpl类，里面记录了修改的类的信息

加载完类之后

changeQuickRedirectField = field;将这个静态变量赋值接下来就走上面的步骤了

插件代码

https://github.com/Meituan-Dianping/Robust/tree/master/gradle-plugin

用AsmInsertImpl和JavaAssistInsertImpl

插桩核心代码

createInsertCode

位于https://github.com/Meituan-Dianping/Robust/blob/master/gradle-plugin/src/main/groovy/robust/gradle/plugin/asm/RobustAsmUtils.java

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