OpenHarmony——包管理子系统包安装模块源码解析 原创 精华

作者：李小慧

简介

包管理子系统负责应用安装包的管理，提供安装包的信息查询、安装、更新、卸载和包信息存储等能力。

包管理子系统架构如下图所示：

代码目录

foundation/appexecfwk/standard
├── kits
│   └── appkit					# Appkit实现的核心代码
├── common
│   └── log					    # 日志组件目录
├── interfaces
│   └── innerkits				# 内部接口存放目录
├── services
│   └── bundlemgr	            # 包管理服务框架代码
│   └── dbms	                # 分布式包管理服务框架代码
├── test						# 测试目录
└── tools                       # bm命令存放目录        

包安装类间关系及关键类介绍

类图

BaseBundleInstaller是安装流程中最重要的类，最终的安装、卸载功能都是在其中实现的。

IBundleMgr中定义了获取IBundleInstaller实例的方法GetBundleInstaller。

IBundleInstaller类是BundleInstallerProxy和BundleInstallerHost的基类，只是在类中声明了Install，Uninstall等函数，具体实现是在这两个子类中实现的。

BundleInstallerProxy类实现了Install，Uninstall功能，利用IPC Proxy向service层发送安装或卸载请求。

服务层Host接收到Proxy发送过来的请求处理消息，调用BundleInstallerHost类的Install功能，调用BundleInstallerManager类的创建安装任务CreateInstallTask函数，在此函数中调用BundleInstaller类的Install功能。

BundleInstaller类的基类是BaseBundleInstaller，它的Install功能实际上调用的是BaseBundleInstaller类的InstallBundle函数。

BMSEventHandler类是继承EventHandler类的，由它来处理系统应用包的安装。它调用SystemBundleInstaller类的InstallSystemBundle函数。

SystemBundleInstaller类也是BaseBundleInstaller的子类，所以最终调用的还是BaseBundleInstaller的InstallBundle功能。

关键类介绍

类名	功能简介
IBundleMgr	包管理类，声明了获取和查询APP信息、包信息等接口。
IBundleInstaller	包安装类，声明了安装、卸载等接口。
BundleInstallerProxy	interface层包安装代理类，继承了IBundleInstaller类，实现了安装、卸载等功能。
BundleInstallerHost	service层host侧包安装类，继承了IBundleInstaller类，处理来自proxy的安装、卸载信息，实现了host侧安装、卸载等功能，。
BundleInstallerManager	包安装服务类，创建安装、卸载等任务。
BundleInstaller	包安装类，实现安装、卸载第三方应用包功能。
BMSEventHandler	继承EventHandler，实现了处理系统应用包安装等功能。
SystemBundleInstaller	系统应用包安装类，实现安装、卸载系统应用包功能。
BaseBundleInstaller	包安装基类，实现安装、卸载包功能。

第三方应用包安装流程图

源码分析

由于流程较为复杂，受篇幅限制，此处摘取流程中重要的代码段进行说明。详细的代码流程需要对照OpenHarmony源码进行学习。

1. 包管理的NAPI Init()函数中注册包安装install

foundation\appexecfwk\standard\kits\appkit\napi\bundlemgr\native_module.cpp

//注册模块
extern "C" __attribute__((constructor)) void RegisterModule(void)
{
    napi_module_register(&_module);
}
//包模块描述
static napi_module _module = {
    .nm_version = 1,
    .nm_flags = 0,
    .nm_filename = nullptr,
    .nm_register_func = Init,
    .nm_modname = "bundle",
    .nm_priv = ((void *)0),
    .reserved = {0}
};
//初始化
static napi_value Init(napi_env env, napi_value exports)
{
    ...
    napi_property_descriptor properties[] = {
        DECLARE_NAPI_FUNCTION("install", Install),//调用Install流程
        DECLARE_NAPI_FUNCTION("recover", Recover),
        DECLARE_NAPI_FUNCTION("uninstall", Uninstall),
    };
    NAPI_CALL(env,
        napi_define_class(env,
            "BundleInstaller",
            NAPI_AUTO_LENGTH,
            BundleInstallerConstructor,
            nullptr,
            sizeof(properties) / sizeof(*properties),
            properties,
            &m_classBundleInstaller));
}

2. 调用 bundle_mgr.c中的 Install

foundation\appexecfwk\standard\kits\appkit\napi\bundlemgr\bundle_mgr.cpp

napi_value Install(napi_env env, napi_callback_info info)
{
   ...
    napi_create_async_work(
            env,
            nullptr,
            resourceName,
            [](napi_env env, void *data) {
                AsyncInstallCallbackInfo *asyncCallbackInfo = (AsyncInstallCallbackInfo *)data;
                if (!asyncCallbackInfo->errCode) {
                    InnerInstall(env,
                        asyncCallbackInfo->hapFiles,
                        asyncCallbackInfo->installParam,
                        asyncCallbackInfo->installResult);//调用InnerInstall
                }
            },
            ...
}

static void InnerInstall(napi_env env, const std::vector<std::string> &bundleFilePath, InstallParam &installParam,
    InstallResult &installResult)
{
    if (bundleFilePath.empty()) {
        installResult.resultCode = static_cast<int32_t>(IStatusReceiver::ERR_INSTALL_FILE_PATH_INVALID);
        return;
    }
    auto iBundleMgr = GetBundleMgr();
    if (!iBundleMgr) {
        APP_LOGE("can not get iBundleMgr");
        return;
    }
    auto iBundleInstaller = iBundleMgr->GetBundleInstaller();
    if ((iBundleInstaller == nullptr) || (iBundleInstaller->AsObject() == nullptr)) {
        APP_LOGE("can not get iBundleInstaller");
        return;
    }
    installParam.installFlag = InstallFlag::REPLACE_EXISTING;
    OHOS::sptr<InstallerCallback> callback = new InstallerCallback();
    if (!callback) {
        APP_LOGE("callback nullptr");
        return;
    }

    sptr<BundleDeathRecipient> recipient(new BundleDeathRecipient(callback));
    iBundleInstaller->AsObject()->AddDeathRecipient(recipient);
    iBundleInstaller->Install(bundleFilePath, installParam, callback);//调用IBundleInstaller的Install
    installResult.resultMsg = callback->GetResultMsg();
    APP_LOGD("InnerInstall resultMsg %{public}s", installResult.resultMsg.c_str());
    installResult.resultCode = callback->GetResultCode();
    APP_LOGD("InnerInstall resultCode %{public}d", installResult.resultCode);
}

3. IBundleInstaller的Install在继承类BundleInstallerProxy 中实现，发送安装消息

foundation\appexecfwk\standard\interfaces\innerkits\appexecfwk_core\src\bundlemgr\bundle_installer_proxy.cpp

bool BundleInstallerProxy::Install(
    const std::string &bundlePath, const InstallParam &installParam, const sptr<IStatusReceiver> &statusReceiver)
{
    BYTRACE_NAME(BYTRACE_TAG_APP, __PRETTY_FUNCTION__);
    MessageParcel data;
    MessageParcel reply;
    MessageOption option(MessageOption::TF_SYNC);

    PARCEL_WRITE_INTERFACE_TOKEN(data, GetDescriptor());
    PARCEL_WRITE(data, String16, Str8ToStr16(bundlePath));
    PARCEL_WRITE(data, Parcelable, &installParam);

    if (!statusReceiver) {
        APP_LOGE("fail to install, for statusReceiver is nullptr");
        return false;
    }
    if (!data.WriteObject<IRemoteObject>(statusReceiver->AsObject())) {
        APP_LOGE("write parcel failed");
        return false;
    }

    return SendInstallRequest(static_cast<int32_t>(IBundleInstaller::Message::INSTALL), data, reply, option);//发送安装消息
}

bool BundleInstallerProxy::SendInstallRequest(const int32_t& code, MessageParcel& data, MessageParcel& reply,
    MessageOption& option)
{
    sptr<IRemoteObject> remote = Remote();
    if (!remote) {
        APP_LOGE("fail to uninstall, for Remote() is nullptr");
        return false;
    }

    int32_t ret = remote->SendRequest(code, data, reply, option);//发送安装消息
    if (ret != NO_ERROR) {
        APP_LOGE("fail to sendRequest, for transact is failed and error code is: %{public}d", ret);
        return false;
    }
    return true;
}

4. 在service层host侧处理安装消息

foundation\appexecfwk\standard\services\bundlemgr\src\bundle_installer_host.cpp

int BundleInstallerHost::OnRemoteRequest(
    uint32_t code, MessageParcel &data, MessageParcel &reply, MessageOption &option)
{
    APP_LOGD("bundle installer host onReceived message, the message code is %{public}u", code);
    std::u16string descripter = GetDescriptor();
    std::u16string remoteDescripter = data.ReadInterfaceToken();
    if (descripter != remoteDescripter) {
        APP_LOGE("fail to write reply message in bundle mgr host due to the reply is nullptr");
        return OBJECT_NULL;
    }

    switch (code) {
        case static_cast<uint32_t>(IBundleInstaller::Message::INSTALL):
            HandleInstallMessage(data);//处理安装消息
            break;
        case static_cast<uint32_t>(IBundleInstaller::Message::INSTALL_MULTIPLE_HAPS):
            HandleInstallMultipleHapsMessage(data);
            break;
        case static_cast<uint32_t>(IBundleInstaller::Message::UNINSTALL):
            HandleUninstallMessage(data);
            break;
        case static_cast<uint32_t>(IBundleInstaller::Message::UNINSTALL_MODULE):
            HandleUninstallModuleMessage(data);
            break;
        case static_cast<uint32_t>(IBundleInstaller::Message::RECOVER):
            HandleRecoverMessage(data);
            break;
        default:
            return IPCObjectStub::OnRemoteRequest(code, data, reply, option);
    }
    return NO_ERROR;
}

void BundleInstallerHost::HandleInstallMessage(Parcel &data)
{
    APP_LOGD("handle install message");
    std::string bundlePath = Str16ToStr8(data.ReadString16());
    std::unique_ptr<InstallParam> installParam(data.ReadParcelable<InstallParam>());
    if (!installParam) {
        APP_LOGE("ReadParcelable<InstallParam> failed");
        return;
    }
    sptr<IRemoteObject> object = data.ReadObject<IRemoteObject>();
    if (object == nullptr) {
        APP_LOGE("read failed");
        return;
    }
    sptr<IStatusReceiver> statusReceiver = iface_cast<IStatusReceiver>(object);

    Install(bundlePath, *installParam, statusReceiver);//调用安装函数
    APP_LOGD("handle install message finished");
}

bool BundleInstallerHost::Install(
    const std::string &bundleFilePath, const InstallParam &installParam, const sptr<IStatusReceiver> &statusReceiver)
{
    if (!CheckBundleInstallerManager(statusReceiver)) {
        APP_LOGE("statusReceiver invalid");
        return false;
    }
    if (!BundlePermissionMgr::VerifyCallingPermission(Constants::PERMISSION_INSTALL_BUNDLE)) {
        APP_LOGE("install permission denied");
        statusReceiver->OnFinished(ERR_APPEXECFWK_INSTALL_PERMISSION_DENIED, "");
        return false;
    }

    manager_->CreateInstallTask(bundleFilePath, CheckInstallParam(installParam), statusReceiver);//创建安装任务
    return true;
}

5. 在service层bundlemgr侧创建安装任务

foundation\appexecfwk\standard\services\bundlemgr\src\bundle_installer_manager.cpp

void BundleInstallerManager::CreateInstallTask(
    const std::string &bundleFilePath, const InstallParam &installParam, const sptr<IStatusReceiver> &statusReceiver)
{
    auto installer = CreateInstaller(statusReceiver);
    if (!installer) {
        APP_LOGE("create installer failed");
        return;
    }
    auto task = [installer, bundleFilePath, installParam] {
        int timerId = HiviewDFX::XCollie::GetInstance().SetTimer(INSTALL_TASK, TIME_OUT_SECONDS,
            nullptr, nullptr, HiviewDFX::XCOLLIE_FLAG_LOG);
        installer->Install(bundleFilePath, installParam);//调用BundleInstaller的Install函数
        HiviewDFX::XCollie::GetInstance().CancelTimer(timerId);
    };
    installersPool_.AddTask(task);
}

6. 在service层bundlemgr侧安装第三方应用包

foundation\appexecfwk\standard\services\bundlemgr\src\bundle_installer.cpp

void BundleInstaller::Install(const std::string &bundleFilePath, const InstallParam &installParam)
{
    ErrCode resultCode = ERR_OK;
    if (installParam.userId == Constants::ALL_USERID) {
        auto userInstallParam = installParam;
        for (auto userId : GetExistsCommonUserIs()) {
            userInstallParam.userId = userId;
            userInstallParam.installFlag = InstallFlag::REPLACE_EXISTING;
            resultCode = InstallBundle(
                bundleFilePath, userInstallParam, Constants::AppType::THIRD_PARTY_APP);//安装第三方应用的包
            ResetInstallProperties();
        }
    } else {
        resultCode = InstallBundle(
            bundleFilePath, installParam, Constants::AppType::THIRD_PARTY_APP);//安装第三方应用的包
    }

    statusReceiver_->OnFinished(resultCode, "");
    SendRemoveEvent();
}

7. 调用BundleInstaller基类BaseBundleInstaller的InstallBundle函数

foundation\appexecfwk\standard\services\bundlemgr\src\base_bundle_installer.cpp

ErrCode BaseBundleInstaller::InstallBundle(
    const std::string &bundlePath, const InstallParam &installParam, const Constants::AppType appType)
{
    std::vector<std::string> bundlePaths { bundlePath };
    return InstallBundle(bundlePaths, installParam, appType);
}

ErrCode BaseBundleInstaller::InstallBundle(
    const std::vector<std::string> &bundlePaths, const InstallParam &installParam, const Constants::AppType appType)
{
    BYTRACE_NAME(BYTRACE_TAG_APP, __PRETTY_FUNCTION__);
    APP_LOGD("begin to process bundle install");

    PerfProfile::GetInstance().SetBundleInstallStartTime(GetTickCount());

    int32_t uid = Constants::INVALID_UID;
    ErrCode result = ProcessBundleInstall(bundlePaths, installParam, appType, uid);//处理包安装的具体流程
    if (installParam.needSendEvent && dataMgr_ && !bundleName_.empty()) {
        dataMgr_->NotifyBundleStatus(bundleName_,
            Constants::EMPTY_STRING,
            mainAbility_,
            result,
            isAppExist_ ? NotifyType::UPDATE : NotifyType::INSTALL,
            uid);//包安装完成后反馈包安装状态
    }

    PerfProfile::GetInstance().SetBundleInstallEndTime(GetTickCount());
    APP_LOGD("finish to process bundle install");
    return result;
}

系统应用包安装流程图

源码分析

限于篇幅，每个调用函数只摘抄关键语句。

1. 系统应用包安装，调用EventHandler类的继承类BMSEventHandler的ProcessEvent函数

foundation\appexecfwk\standard\services\bundlemgr\src\bundle_mgr_service_event_handler.cpp

void BMSEventHandler::ProcessEvent(const InnerEvent::Pointer &event)
{
    switch (event->GetInnerEventId()) {
        case BUNDLE_SCAN_START: {
            OnStartScanning(Constants::DEFAULT_USERID);//启动扫描
            SetAllInstallFlag();
            DelayedSingleton<BundleMgrService>::GetInstance()->RegisterService();
            break;
        }
        case BUNDLE_SCAN_FINISHED:
            break;
        case BMS_START_FINISHED:
            break;
        case BUNDLE_REBOOT_SCAN_START: {
            RebootStartScanning();
            SetAllInstallFlag();
            DelayedSingleton<BundleMgrService>::GetInstance()->RegisterService();
            break;
        }
        default:
            APP_LOGE("the eventId is not supported");
            break;
    }
}
void BMSEventHandler::OnStartScanning(int32_t userId)
{
    auto future = std::async(std::launch::async, [this, userId] {
        ProcessSystemBundleInstall(Constants::AppType::SYSTEM_APP, userId);//处理系统应用包安装
        ProcessSystemBundleInstall(Constants::AppType::THIRD_SYSTEM_APP, userId);//处理第三方系统应用包安装
    });
    future.get();
}

void BMSEventHandler::ProcessSystemBundleInstall(Constants::AppType appType, int32_t userId) const
{
    APP_LOGD("scan thread start");
    auto scanner = std::make_unique<BundleScanner>();
    if (!scanner) {
        APP_LOGE("make scanner failed");
        return;
    }

    std::string scanDir = (appType == Constants::AppType::SYSTEM_APP) ? Constants::SYSTEM_APP_SCAN_PATH
                                                                      : Constants::THIRD_SYSTEM_APP_SCAN_PATH;
    APP_LOGD("scanDir: %{public}s and userId: %{public}d", scanDir.c_str(), userId);
    std::list<std::string> bundleList = scanner->Scan(scanDir);
    auto iter = std::find(bundleList.begin(), bundleList.end(), Constants::SYSTEM_RESOURCES_APP_PATH);
    if (iter != bundleList.end()) {
        bundleList.erase(iter);
        bundleList.insert(bundleList.begin(), Constants::SYSTEM_RESOURCES_APP_PATH);
    }

    for (const auto &item : bundleList) {
        SystemBundleInstaller installer(item);
        APP_LOGD("scan item %{public}s", item.c_str());
        if (!installer.InstallSystemBundle(appType, userId)) {//调用安装系统包流程
            APP_LOGW("Install System app:%{public}s error", item.c_str());
        }
    }

    PerfProfile::GetInstance().Dump();
}

2. 调用 SystemBundleInstaller的InstallSystemBundle流程

foundation\appexecfwk\standard\services\bundlemgr\src\system_bundle_installer.cpp

bool SystemBundleInstaller::InstallSystemBundle(Constants::AppType appType, int32_t userId)
{
    InstallParam installParam;
    installParam.userId = userId;
    installParam.isPreInstallApp = true;
    installParam.noSkipsKill = false;
    installParam.needSendEvent = false;
    if (appType == Constants::AppType::SYSTEM_APP
        || appType == Constants::AppType::THIRD_SYSTEM_APP) {
        installParam.needSavePreInstallInfo = true;
    }
    ErrCode result = InstallBundle(filePath_, installParam, appType);
    if (result != ERR_OK) {
        APP_LOGE("install system bundle fail, error: %{public}d", result);
        return false;
    }
    return true;
}

3. 与第三方应用包的安装流程一样，系统应用包安装也是调用SystemBundleInstaller的基类BaseBundleInstaller的InstallBundle函数

foundation\appexecfwk\standard\services\bundlemgr\src\base_bundle_installer.cpp

ErrCode BaseBundleInstaller::InstallBundle(
    const std::string &bundlePath, const InstallParam &installParam, const Constants::AppType appType)
{
    std::vector<std::string> bundlePaths { bundlePath };
    return InstallBundle(bundlePaths, installParam, appType);
}

ErrCode BaseBundleInstaller::InstallBundle(
    const std::vector<std::string> &bundlePaths, const InstallParam &installParam, const Constants::AppType appType)
{
    BYTRACE_NAME(BYTRACE_TAG_APP, __PRETTY_FUNCTION__);
    APP_LOGD("begin to process bundle install");

    PerfProfile::GetInstance().SetBundleInstallStartTime(GetTickCount());

    int32_t uid = Constants::INVALID_UID;
    ErrCode result = ProcessBundleInstall(bundlePaths, installParam, appType, uid);//处理包安装的具体流程
    if (installParam.needSendEvent && dataMgr_ && !bundleName_.empty()) {
        dataMgr_->NotifyBundleStatus(bundleName_,
            Constants::EMPTY_STRING,
            mainAbility_,
            result,
            isAppExist_ ? NotifyType::UPDATE : NotifyType::INSTALL,
            uid);//包安装完成后反馈包安装状态
    }

    PerfProfile::GetInstance().SetBundleInstallEndTime(GetTickCount());
    APP_LOGD("finish to process bundle install");
    return result;
}

总结

本文主要介绍了包管理子系统的关键实现机制、主要类关系及重要的处理流程，为开发人员维护和扩展功能提供参考。

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