Tinker源码分析一

从加载流程来分析

处理下载之后的修复包：

/** 
* new patch file to install, try install them with :patch process
 * Generally you will not use it
 * 
* @param context 
* @param patchLocation 
*/
public static void onReceiveUpgradePatch(Context context, String patchLocation) {   

 Tinker.with(context).getPatchListener().onPatchReceived(patchLocation, true);

}

调用TinkerInstaller的onReceiveUpgradePatch方法，在这个方法里面初始化Tinker类，并且调用PatchListener的onPatchReceived(String path, boolean isUpgrade)方法。

private Tinker(Context context, int tinkerFlags, LoadReporter loadReporter, PatchReporter patchReporter,               PatchListener listener, File patchDirectory, File patchInfoFile,               boolean isInMainProc, boolean isPatchProcess, boolean tinkerLoadVerifyFlag) {    
    this.context = context; 
    this.listener = listener;
    this.loadReporter = loadReporter;
    this.patchReporter = patchReporter;
    this.tinkerFlags = tinkerFlags;
    this.patchDirectory = patchDirectory;
    this.patchInfoFile = patchInfoFile;
    this.isMainProcess = isInMainProc;
    this.tinkerLoadVerifyFlag = tinkerLoadVerifyFlag;
    this.isPatchProcess = isPatchProcess;
}

其中：patchDirectory是patch包的存储位置。patchInfoFile是存储Patch包版本等信息的文件。

一、对修复包的第一层验证

这是Tinker 的初始化方法，初始化了LoaderReporter、PatchReporter
PatchListener等。

值得注意的是Tinker初始化之前必须得先调用TinkerInstaller的install方法,这个后面再说。

/** 
* when we receive a patch, what would we do? 
* you can overwrite it
 * 
* @param path 
* @param isUpgrade 
* @return 
*/
@Overridepublic int onPatchReceived(String path, boolean isUpgrade) {
     int returnCode = patchCheck(path, isUpgrade);    
     if (returnCode == ShareConstants.ERROR_PATCH_OK) {  
         TinkerPatchService.runPatchService(context, path, isUpgrade);   
      } else {         
       Tinker.with(context).getLoadReporter().
       onLoadPatchListenerReceiveFail(new File(path), returnCode, isUpgrade);   
      }    
    return returnCode;
}

DefaultPatchListener中，对修复包进行检查，如果修复包ok,则开启一个单独的进程合成全量包。如果修复包不完整或者有其它问题，则调用LoadReporter的onLoadPatchListenerReceiveFail(File patchFile, int errorCode, boolean isUpgrade)方法通知。

patchCheck验证了：

Tinker开关是否开启
修复文件是否存在
是不是通过合成进程执行的操作
合成进程是否正在执行

第二、开启合成进程

public static void runPatchService(Context context, String path, boolean isUpgradePatch) {
    Intent intent = new Intent(context, TinkerPatchService.class);
    intent.putExtra(PATCH_PATH_EXTRA, path);
    intent.putExtra(PATCH_NEW_EXTRA, isUpgradePatch);
    context.startService(intent);
}

在TinkerPatchService中开启合成进程的服务。它是一个IntentSerivce，是在单独的线程中进行的操作。下面来看一下onHandleIntent中的操作。

@Overrideprotected void onHandleIntent(Intent intent) {
    final Context context = getApplicationContext();
    Tinker tinker = Tinker.with(context);
    tinker.getPatchReporter().onPatchServiceStart(intent);
    //调用patchReporter的onPatchServiceStart(Intent intent) 方法通知。
    if (intent == null) {
        TinkerLog.e(TAG, "TinkerPatchService received a null intent,
 ignoring.");
        return;
    }
    String path = getPatchPathExtra(intent);
    if (path == null) {
        TinkerLog.e(TAG, "TinkerPatchService can't get the path extra, ignoring.");
        return;
    }
    File patchFile = new File(path);
    boolean isUpgradePatch = getPatchUpgradeExtra(intent);
    long begin = SystemClock.elapsedRealtime();
    boolean result;
    long cost;
    Throwable e = null;
    increasingPriority();
    PatchResult patchResult = new PatchResult();
    try {
        if (isUpgradePatch) {
            if (upgradePatchProcessor == null) {
                throw new TinkerRuntimeException("upgradePatchProcessor is null.");
            }
            result = upgradePatchProcessor.tryPatch(context, path, patchResult);
        } else { 
           //just recover from exist patch
            if (repairPatchProcessor == null) {
                throw new TinkerRuntimeException("upgradePatchProcessor is null.");
            }
            result = repairPatchProcessor.tryPatch(context, path, patchResult);
        }
    } catch (Throwable throwable) {
        e = throwable;
        result = false;
        tinker.getPatchReporter().onPatchException(patchFile, e, isUpgradePatch);
    }
    cost = SystemClock.elapsedRealtime() - begin; 
   tinker.getPatchReporter(). 
       onPatchResult(patchFile, result, cost, isUpgradePatch); 
   patchResult.isSuccess = result;
    patchResult.isUpgradePatch = isUpgradePatch;
    patchResult.rawPatchFilePath = path;
    patchResult.costTime = cost;
    patchResult.e = e;
    AbstractResultService.runResultService(context, patchResult);
}

有几个操作需要注意的：

调用patchReporter的onPatchServiceStart(Intent intent)方法通知。
让服务置于前台服务increasingPriority。

1.startForeground(int id, Notification notification)
这个方法，可以让后台服务置于前台，就像音乐播放器的，播放服务一样，不会被系统杀死。
2.开启一个InnerService降低被杀死的概率。
TinkerInstaller调用的install方法，会初始化两个AbstractPatch，ReparePatch和UpgradePatch。在这里会调用它们的tryPatch(Context context, String tempPatchPath, PatchResult patchResult)方法来执行合并操作。并将结果返回。
如果两个AbstractPatch为空，则会捕获异常。并且调用PatchReporter的onPatchException来通知。
修复成功后调用PatchReporter的onPatchResult()来通知，有花费时间等信息。
调用AbstactResultService的runResultService(Context context, PatchResult result)方法。也是在TinkerInstaller的Install的时候赋值。也是一个IntentService。

这个Service会将补丁合成进程返回的结果返回给主进程，在单独的线程中执行。onHandleIntent中只是回调了runResultService(Context context, PatchResult result)方法。通过IntentService完成了进程间的通信。

第三、最后的合成方法
为了不至于离的太远，我们还顺着刚才的流程分析AbstractPatch的tryPatch方法。我们先看下UpgradePatch

 @Override
    public boolean tryPatch(Context context, String tempPatchPath, PatchResult patchResult) {
        Tinker manager = Tinker.with(context);
        final File patchFile = new File(tempPatchPath);
        if (!manager.isTinkerEnabled() || !ShareTinkerInternals.isTinkerEnableWithSharedPreferences(context)) {
            TinkerLog.e(TAG, "UpgradePatch tryPatch:patch is disabled, just return");
            return false;
        }
        if (!patchFile.isFile() || !patchFile.exists()) {
            TinkerLog.e(TAG, "UpgradePatch tryPatch:patch file is not found, just return");
            return false; 
       }
        //check the signature, we should create a new checker
        ShareSecurityCheck signatureCheck = new ShareSecurityCheck(context);
        int returnCode = ShareTinkerInternals.checkTinkerPackage(context, manager.getTinkerFlags(), patchFile, signatureCheck);
        if (returnCode != ShareConstants.ERROR_PACKAGE_CHECK_OK) {            TinkerLog.e(TAG, "UpgradePatch tryPatch:onPatchPackageCheckFail");
            manager.getPatchReporter().onPatchPackageCheckFail(patchFile, true, returnCode);
            return false;
        }
        patchResult.patchTinkerID = signatureCheck.getNewTinkerID();
        patchResult.baseTinkerID = signatureCheck.getTinkerID();
        //it is a new patch, so we should not find a exist
        SharePatchInfo oldInfo = manager.getTinkerLoadResultIfPresent().patchInfo;
        String patchMd5 = SharePatchFileUtil.getMD5(patchFile);
        if (patchMd5 == null) {
            TinkerLog.e(TAG, "UpgradePatch tryPatch:patch md5 is null, just return");
            return false;
        }
        //use md5 as version
        patchResult.patchVersion = patchMd5;
        SharePatchInfo newInfo;
        //already have patch
        if (oldInfo != null) { 
           if (oldInfo.oldVersion == null || oldInfo.newVersion == null) {
                TinkerLog.e(TAG, "UpgradePatch tryPatch:onPatchInfoCorrupted");
                manager.getPatchReporter().onPatchInfoCorrupted(patchFile, oldInfo.oldVersion, oldInfo.newVersion, true);
                return false;
            }
            if (oldInfo.oldVersion.equals(patchMd5) || oldInfo.newVersion.equals(patchMd5)) {
                TinkerLog.e(TAG, "UpgradePatch tryPatch:onPatchVersionCheckFail");
                manager.getPatchReporter().onPatchVersionCheckFail(patchFile, oldInfo, patchMd5, true); 
               return false;
            }
            newInfo = new SharePatchInfo(oldInfo.oldVersion, patchMd5);        } else {
            newInfo = new SharePatchInfo("", patchMd5);
        }
        //check ok, we can real recover a new patch
        final String patchDirectory = manager.getPatchDirectory().getAbsolutePath();
        TinkerLog.i(TAG, "UpgradePatch tryPatch:dexDiffMd5:%s", patchMd5);
        final String patchName = SharePatchFileUtil.getPatchVersionDirectory(patchMd5); 
       final String patchVersionDirectory = patchDirectory + "/" + patchName; 
       TinkerLog.i(TAG, "UpgradePatch tryPatch:patchVersionDirectory:%s", patchVersionDirectory);
        //it is a new patch, we first delete if there is any files
        //don't delete dir for faster retry//
        SharePatchFileUtil.deleteDir(patchVersionDirectory); 
       //copy file 
       File destPatchFile = new File(patchVersionDirectory + "/" + SharePatchFileUtil.getPatchVersionFile(patchMd5));
        try {
            SharePatchFileUtil.copyFileUsingStream(patchFile, destPatchFile);            TinkerLog.w(TAG, "UpgradePatch after %s size:%d, %s size:%d", patchFile.getAbsolutePath(), patchFile.length(),                destPatchFile.getAbsolutePath(), destPatchFile.length());
        } catch (IOException e) {
//            e.printStackTrace();
            TinkerLog.e(TAG, "UpgradePatch tryPatch:copy patch file fail from %s to %s", patchFile.getPath(), destPatchFile.getPath());
            manager.getPatchReporter().onPatchTypeExtractFail(patchFile, destPatchFile, patchFile.getName(), ShareConstants.TYPE_PATCH_FILE, true);
            return false;
        }
        //we use destPatchFile instead of patchFile, because patchFile may be deleted during the patch process
        if (!DexDiffPatchInternal.tryRecoverDexFiles(manager, signatureCheck, context, patchVersionDirectory, destPatchFile, true)) {            TinkerLog.e(TAG, "UpgradePatch tryPatch:new patch recover, try patch dex failed");
            return false;
        }
        if (!BsDiffPatchInternal.tryRecoverLibraryFiles(manager, signatureCheck, context, patchVersionDirectory, destPatchFile, true)) {            TinkerLog.e(TAG, "UpgradePatch tryPatch:new patch recover, try patch library failed"); 
           return false;
        }
        if (!ResDiffPatchInternal.tryRecoverResourceFiles(manager, signatureCheck, context, patchVersionDirectory, destPatchFile, true)) {            TinkerLog.e(TAG, "UpgradePatch tryPatch:new patch recover, try patch resource failed");
            return false; 
       } 
       final File patchInfoFile = manager.getPatchInfoFile();
        if (!SharePatchInfo.rewritePatchInfoFileWithLock(patchInfoFile, newInfo, SharePatchFileUtil.getPatchInfoLockFile(patchDirectory))) {            TinkerLog.e(TAG, "UpgradePatch tryPatch:new patch recover, rewrite patch info failed"); 
           manager.getPatchReporter().onPatchInfoCorrupted(patchFile, newInfo.oldVersion, newInfo.newVersion, true); 
           return false;
        }
        TinkerLog.w(TAG, "UpgradePatch tryPatch: done, it is ok");        return true; 
   }

方法有点长，我们一步一步分析，里面有几个点需要注意。

ShareSecurityCheck是检查签名的类，里面封闭了签名检查的方法
ShareTinkerInternals的静态方法checkTinkerPackage(Context context, int tinkerFlag, File patchFile, ShareSecurityCheck securityCheck)传入了ShareSecurityCheck,它代理了：
1.签名检查
2.TinkerId检查
3.Tinker开关检查，dex、resource、libriry 的meta信息检查。
如果检查失败通过PatchReporter抛出onPatchPackageCheckFail
-SharePatchInfo,存储了修复包的版本信息，有oldVersion和newVersion。newVersion是修复包的md5值。
4.什么时候oldInfo会存在呢？加载成功过一次，也修复成功了。再次执行合成的时候。如果下载的包还是之前的包，则会报告onPatchVersionCheckFail。如果是新的修复包，则会把 oldVersion赋值给 SharePatchInfo(String oldVer, String newVew)中的ondVer。
拷贝修复包到data/data目录
DexDiff合成dex、BsDiff合成library、BsDiff合成res。
拷贝SharePatchInfo到PatchInfoFile中，PatchInfoFile在TinkerInstaller的install方法中初始化。

稍后再分别分析patch包的资源合成操作。先分析一下最早调用的TinkerInstaller的install方法。

四、安装方法
TinkerInstaller类中有两个安装方法一个是默认的，一个是自定义属性的。

/**
 * install tinker with default config, you must install tinker before you use their api
 * or you can just use {@link TinkerApplicationHelper}'s api 
* 
* @param applicationLike 
*/
public static void install(ApplicationLike applicationLike) {
    Tinker tinker = new Tinker.Builder(applicationLike.getApplication()).build();
    Tinker.create(tinker);
    tinker.install(applicationLike.getTinkerResultIntent());
}

这个是默认的方法，自定义方法只不过install的参数传入了自己自定义的一些类。

/**
 * install tinker with custom config, you must install tinker before you use their api
 * or you can just use {@link TinkerApplicationHelper}'s api *
 * @param applicationLike 
* @param loadReporter
 * @param patchReporter 
* @param listener
 * @param resultServiceClass 
* @param upgradePatchProcessor 
* @param repairPatchProcessor
 */
public static void install(ApplicationLike applicationLike, LoadReporter loadReporter, PatchReporter patchReporter,                           PatchListener listener, Class resultServiceClass,                           AbstractPatch upgradePatchProcessor, AbstractPatch repairPatchProcessor) {
    Tinker tinker = new Tinker.Builder(applicationLike.getApplication())        .tinkerFlags(applicationLike.getTinkerFlags())
        .loadReport(loadReporter)
        .listener(listener)
        .patchReporter(patchReporter) 
       .tinkerLoadVerifyFlag(applicationLike.getTinkerLoadVerifyFlag()).build();
    Tinker.create(tinker);
    tinker.install(applicationLike.getTinkerResultIntent(), resultServiceClass,
 upgradePatchProcessor, repairPatchProcessor);
}

传入的参数有：

ApplicationLike应用的代理application
LoadReporter加载合成的包的报告类
PatchReporter打修复包过程中的报告类
PatchListener对修复包最开始的检查
ResultService 从合成进程取合成结果
UpgradePatchProcessor 生成一个新的patch合成包
ReparePatchProcessor修复上一次合成失败的修复包

下面看一下Tinker中核心的install方法

/**
 * you must install tinker first!! 
*
 * @param intentResult 
* @param serviceClass 
* @param upgradePatch
 * @param repairPatch 
*/public void install(Intent intentResult, Class serviceClass,
                    AbstractPatch upgradePatch, AbstractPatch repairPatch) {
    sInstalled = true;
    AbstractResultService.setResultServiceClass(serviceClass);
    TinkerPatchService.setPatchProcessor(upgradePatch, repairPatch);
    if (!isTinkerEnabled()) {
        TinkerLog.e(TAG, "tinker is disabled");
        return;
    }
    if (intentResult == null) {
        throw new TinkerRuntimeException("intentResult must not be null.");
    }
    tinkerLoadResult = new TinkerLoadResult(); 
   tinkerLoadResult.parseTinkerResult(getContext(), intentResult);
    //after load code set
    loadReporter.onLoadResult(patchDirectory, tinkerLoadResult.loadCode, tinkerLoadResult.costTime);
    if (!loaded) {
        TinkerLog.w(TAG, "tinker load fail!");
    }}

设置自定义的ResultService
设置自定义的UpgradePatch和ReparePatch
创建TinkerLoadResult调用parseTinkerResult(Context context, Intent intentResult)解析上次合成之后的信息：花费时间，返回值等。
调用LoaderReporter的onLoadResult方法，通知，加载结果。

分析到些结束，下一篇将分析一下具体的合成过程。

Tinker源码分析一

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