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README.md
Apache-2.0

samgr_lite

Introduction

Due to limited platform resources, a unified system ability framework is provided to harmonize differences of hardware architectures (for example, RISC-V, Cortex-M, and Cortex-A), platform resources, and running modes. Two types of hardware platforms (M- and A-core) are defined.

  • M-core: hardware platforms with Cortex-M or equivalent processing capabilities. The system memory is generally less than 512 KB. There is only a lightweight file system that can be used in limited scenarios, or no file system at all. M-core platforms comply with the Cortex Microcontroller Software Interface Standard (CMSIS).
  • A-core: hardware platforms with Cortex-A or equivalent processing capabilities. The system memory is greater than 512 KB. There is a comprehensive file system for storing a large amount of data. A-core platforms comply with the Portable Operating System Interface (POSIX) specifications.

This service-oriented system ability framework enables you to develop services, features, and external APIs, and implement multi-service process sharing and service invoking for inter-process communication (IPC). Where:

  • M core provides services, features, external APIs, and multi-service process sharing development.
  • In addition to the capabilities provided by M-core, A-core provides capabilities such as IPC service invoking, permission control for IPC service invoking, and IPC service API development.

System Architecture

Figure 1 Service-oriented architecture

  • Provider: a service provider that provides capabilities (external APIs) for the system.
  • Consumer: a service consumer that invokes the features (external APIs) provided by the service.
  • Samgr: an agency that manages capabilities provided by providers and helps consumers discover providers' capabilities.

Figure 2 Main objects of the system ability framework

  • SamgrLite: provides service registration and discovery.
  • Service: implements lifecycle APIs of the service during service development.
  • Feature: implements lifecycle APIs of the feature during feature development.
  • IUnknown: implements external APIs for services or features based on IUnknown.
  • IClientProxy: implements the consumer's proxy to send messages during IPC invoking.
  • IServerProxy: implements the provider's proxy during IPC invoking, which needs to be implemented by developers.

Directory Structure

Figure 1 Structure of the source code directory of the system ability framework

Name Description
interfaces/kits/samgr_lite/samgr External APIs of the M- and A-core system ability frameworks.
interfaces/kits/samgr_lite/registry External APIs for service invocation between A-core processes.
interfaces/kits/samgr_lite/communication/broadcast External APIs of the event broadcast service within M- and A-core processes.
services/samgr_lite/samgr/adapter POSIX and CMSIS interface adaptation layer, which is used to harmonize the differences between the APIs of M- and A-core.
services/samgr_lite/samgr/registry Stub functions for M-core service registration and discovery.
services/samgr_lite/samgr/source Basic code for the M- and A-core system ability frameworks.
services/samgr_lite/samgr_client Registration and discovery for service invocation between A-core processes.
services/samgr_lite/samgr_server IPC address management and access control for service invocation between A-core processes.
services/samgr_lite/samgr_endpoint Packet Rx/Tx management for A-core IPC.
services/samgr_lite/communication/broadcast Event broadcast service for M- and A-core processes.

Constraints

  • The system ability framework is developed using the C programming language.
  • Services in the same process use IUnknown for invoking. Messages are passed to the service through IUnknown.
  • The service name and feature name must be constant strings and the length must be less than 16 bytes.
  • More-core depends on the Bootstrap service and calls the OHOS_SystemInit() function in the system startup function.
  • A-core depends on the Samgr library and calls the SAMGR_Bootstrap() function in the main function.

Developing a Service

  • Inherit and redefine a service.

    typedef struct ExampleService {
        INHERIT_SERVICE;
        INHERIT_IUNKNOWNENTRY(DefaultFeatureApi);
        Identity identity;
    } ExampleService;
  • Implement the lifecycle function of the service.

    static const char *GetName(Service *service)
    {
        return EXAMPLE_SERVICE;
    }
    
    static BOOL Initialize(Service *service, Identity identity)
    {
        ExampleService *example = (ExampleService *)service;
        // Save the unique ID of the service, which is used when IUnknown is used to send messages to the service.
        example->identity = identity;
        return TRUE;
    }
    static BOOL MessageHandle(Service *service, Request *msg)
    {
        ExampleService *example = (ExampleService *)service;
        switch (msg->msgId) {
            case MSG_SYNC:
                // Process the service.
                break;
            default:break;
        }
        return FALSE;
    }
    static TaskConfig GetTaskConfig(Service *service)
    {
        TaskConfig config = {LEVEL_HIGH, PRI_BELOW_NORMAL,
                             0x800, 20, SHARED_TASK};
        return config;
    }
  • Create a service object.

    static ExampleService g_example = {
        .GetName = GetName,
        .Initialize = Initialize,
        .MessageHandle = MessageHandle,
        .GetTaskConfig = GetTaskConfig,
        SERVER_IPROXY_IMPL_BEGIN,
            .Invoke = NULL,
            .SyncCall = SyncCall,
        IPROXY_END,
    };
  • Register the service and API with Samgr.

    static void Init(void)
    {
        SAMGR_GetInstance()->RegisterService((Service *)&g_example);
        SAMGR_GetInstance()->RegisterDefaultFeatureApi(EXAMPLE_SERVICE, GET_IUNKNOWN(g_example));
    }
  • Define the initializer of the service.

    SYSEX_SERVICE_INIT(Init);
    

Developing a Feature of a Service

  • Inherit and redefine a feature.

    typedef struct DemoFeature {
        INHERIT_FEATURE;
        INHERIT_IUNKNOWNENTRY(DemoApi);
        Identity identity;
        Service *parent;
    } DemoFeature;
  • Implement the lifecycle function of the feature.

    static const char *FEATURE_GetName(Feature *feature)
    {
        return EXAMPLE_FEATURE;
    }
    
    static void FEATURE_OnInitialize(Feature *feature, Service *parent, Identity identity)
    {
        DemoFeature *demoFeature = (DemoFeature *)feature;
        demoFeature->identity = identity;
        demoFeature->parent = parent;
    }
    
    static void FEATURE_OnStop(Feature *feature, Identity identity)
    {
        g_example.identity.queueId = NULL;
        g_example.identity.featureId = -1;
        g_example.identity.serviceId = -1;
    }
    
    static BOOL FEATURE_OnMessage(Feature *feature, Request *request)
    {
        if (request->msgId == MSG_PROC) {
            Response response = {.data = "Yes, you did!", .len = 0};
            SAMGR_SendResponse(request, &response);
            return TRUE;
        } else {
            if (request->msgId == MSG_TIME_PROC) {
                LOS_Msleep(WAIT_FEATURE_PROC * 10);
                if (request->msgValue) {
                    SAMGR_PrintServices();
                } else {
                    SAMGR_PrintOperations();
                }
                AsyncTimeCall(GET_IUNKNOWN(g_example));
                return FALSE;
            }
        }
        return FALSE;
    }
  • Create a feature object.

    static DemoFeature g_example = {
        .GetName = FEATURE_GetName,
        .OnInitialize = FEATURE_OnInitialize,
        .OnStop = FEATURE_OnStop,
        .OnMessage = FEATURE_OnMessage,
        DEFAULT_IUNKNOWN_ENTRY_BEGIN,
            .AsyncCall = AsyncCall,
            .AsyncTimeCall = AsyncTimeCall,
            .SyncCall = SyncCall,
            .AsyncCallBack = AsyncCallBack,
        DEFAULT_IUNKNOWN_ENTRY_END,
        .identity = {-1, -1, NULL},
    };
  • Register the feature and API with Samgr.

    static void Init(void){
        SAMGR_GetInstance()->RegisterFeature(EXAMPLE_SERVICE, (Feature *)&g_example);
        SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(g_example));
    }
  • Define the initializer of the feature.

    SYSEX_FEATURE_INIT(Init);
    

Developing an External API for Intra-Process Communication

  • Define the IUnknown API.

    typedef struct DemoApi {
        INHERIT_IUNKNOWN;
        BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
        BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
        BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
        BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, Handler handler);
    } DemoApi;
  • Define the reference object of IUnknown.

    typedef struct DemoRefApi {
        INHERIT_IUNKNOWNENTRY(DemoApi);
    } DemoRefApi;
  • Initialize the object of IUnknown.

    static DemoRefApi api = {
        DEFAULT_IUNKNOWN_ENTRY_BEGIN,
            .AsyncCall = AsyncCall,
            .AsyncTimeCall = AsyncTimeCall,
            .SyncCall = SyncCall,
            .AsyncCallBack = AsyncCallBack,
        DEFAULT_IUNKNOWN_ENTRY_END,
    };
  • Register the feature API.

    SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(api));
    

Invoking a Service in the Same Process

  • Obtain the external API of the service.

    DemoApi *demoApi = NULL;
    IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
    if (iUnknown == NULL) {
        return NULL;
    }
    int result = iUnknown->QueryInterface(iUnknown, DEFAULT_VERSION, (void **)&demoApi);
    if (result != 0 || demoApi == NULL) {
        return NULL;
    }
  • Call the API.

    if (demoApi->AsyncCallBack == NULL) {
        return NULL;
    }
    demoApi->AsyncCallBack((IUnknown *)demoApi, "I wanna async call callback good result!", AsyncHandler);
  • Release the API.

    int32 ref = demoApi->Release((IUnknown *)demoApi);
    

Developing an External API for IPC

  • Inherit IServerProxy to replace IUnknown: INHERIT_SERVER_IPROXY

    typedef struct DemoFeatureApi {
        INHERIT_SERVER_IPROXY;
        BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
        BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
        BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
        BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler);
    } DemoFeatureApi;
  • Initialize the IServerProxy object.

    static DemoFeature g_example = {
        SERVER_IPROXY_IMPL_BEGIN,
        .Invoke = Invoke,
        .AsyncCall = AsyncCall,
        .AsyncTimeCall = AsyncTimeCall,
        .SyncCall = SyncCall,
        .AsyncCallBack = AsyncCallBack,
        IPROXY_END,
    };
  • Implement the Invoke function to process IPC messages.

    static int32 Invoke(IServerProxy *iProxy, int funcId, void *origin, IpcIo *req, IpcIo *reply)
    {
        DemoFeatureApi *api = (DemoFeatureApi *)iProxy;
        BOOL ret;
        size_t len = 0;
        switch (funcId) {
            case ID_ASYNCALL:
                ret = api->AsyncCall((IUnknown *)iProxy, (char *)IpcIoPopString(req, &len));
                IpcIoPushBool(reply, ret);
                break;
            case ID_ASYNTIMECALL:
                ret = api->AsyncTimeCall((IUnknown *)iProxy);
                IpcIoPushBool(reply, ret);
                break;
            case ID_SYNCCALL: {
                struct Payload payload;
                payload.id = IpcIoPopInt32(req);
                payload.value = IpcIoPopInt32(req);
                payload.name = (char *)IpcIoPopString(req, &len);
                ret = api->SyncCall((IUnknown *)iProxy, &payload);
                IpcIoPushString(reply, ret ? "TRUE" : "FALSE");
            }
                break;
            case ID_ASYNCCALLBACK: { // convert to sync proxy
                IpcIoPushString(reply, "Yes, you did!");
                IpcIoPushBool(reply, TRUE);
            }
                break;
            default:
                IpcIoPushBool(reply, FALSE);
                break;
        }
        return EC_SUCCESS;
    }
  • Register the API. This step is same as the API registration for intra-process communication.

    SAMGR_GetInstance()->RegisterFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE, GET_IUNKNOWN(g_example));
    

Invoking a Service in Another Process

  • Obtain the external API of the service in another process.

    IClientProxy *demoApi = NULL;
    IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
    if (iUnknown == NULL) {
        return NULL;
    }
    int result = iUnknown->QueryInterface(iUnknown, CLIENT_PROXY_VER, (void **)&demoApi);
    if (result != 0 || demoApi == NULL) {
        return NULL;
    }
  • Invoke the API for sending IPC messages.

    IpcIo request;char data[250];
    IpcIoInit(&request, data, sizeof(data), 0);
    demoApi->Invoke(demoApi, 0, &request, NULL, NULL);
  • Release the API.

    int32 ref = demoApi->Release((IUnknown *)demoApi);
    

Developing a Client Proxy for Inter-Process Service Invocation

  • Define a client proxy for the IPC API.

    typedef struct DemoClientProxy {
        INHERIT_CLIENT_IPROXY;
        BOOL (*AsyncCall)(IUnknown *iUnknown, const char *buff);
        BOOL (*AsyncTimeCall)(IUnknown *iUnknown);
        BOOL (*SyncCall)(IUnknown *iUnknown, struct Payload *payload);
        BOOL (*AsyncCallBack)(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler);
    } DemoClientProxy;
    typedef struct DemoClientEntry {
        INHERIT_IUNKNOWNENTRY(DemoClientProxy);
    } DemoClientEntry;
  • Enable the client proxy to encapsulate the IPC message API.

    static BOOL AsyncCall(IUnknown *iUnknown, const char *buff)
    {
        DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
        IpcIo request;
        char data[MAX_DATA_LEN];
        IpcIoInit(&request, data, MAX_DATA_LEN, 0);
        IpcIoPushString(&request, buff);
        int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNCALL, &request, NULL, NULL);
        return ret == EC_SUCCESS;
    }
    
    static BOOL AsyncTimeCall(IUnknown *iUnknown)
    {
        DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
        IpcIo request;
        char data[MAX_DATA_LEN];
        IpcIoInit(&request, data, MAX_DATA_LEN, 0);
        int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNTIMECALL, &request, NULL, NULL);
        return ret == EC_SUCCESS;
    }
    
    static int Callback(IOwner owner, int code, IpcIo *reply)
    {
        size_t len = 0;
        return strcpy_s(owner, MAX_DATA_LEN, (char *)IpcIoPopString(reply, &len));
    }
    
    static BOOL SyncCall(IUnknown *iUnknown, struct Payload *payload)
    {
        DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
        IpcIo request;
        char data[MAX_DATA_LEN];
        IpcIoInit(&request, data, MAX_DATA_LEN, 0);
        IpcIoPushInt32(&request, payload->id);
        IpcIoPushInt32(&request, payload->value);
        IpcIoPushString(&request, payload->name);
        int ret = proxy->Invoke((IClientProxy *)proxy, ID_SYNCCALL, &request, data, Callback);
        data[MAX_DATA_LEN - 1] = 0;
        HILOG_INFO(HILOG_MODULE_APP, "[TID:0x%lx]Remote response is %s!", pthread_self(), data);
        return ret == EC_SUCCESS;
    }
    
    struct CurrentNotify {
        IOwner notify;
        INotifyFunc handler;
    };
    
    static int CurrentCallback(IOwner owner, int code, IpcIo *reply)
    {
        struct CurrentNotify *notify = (struct CurrentNotify *)owner;
        size_t len = 0;
        char *response = (char *)IpcIoPopString(reply, &len);
        HILOG_INFO(HILOG_MODULE_APP, "[TID:0x%lx]Notify Remote response is %s!", pthread_self(), response);
        notify->handler(notify->notify, response);
        return EC_SUCCESS;
    }
    
    static BOOL AsyncCallBack(IUnknown *iUnknown, const char *buff, IOwner notify, INotifyFunc handler)
    {
        struct CurrentNotify owner = {notify, handler};
        DemoClientProxy *proxy = (DemoClientProxy *)iUnknown;
        IpcIo request;
        char data[MAX_DATA_LEN];
        IpcIoInit(&request, data, MAX_DATA_LEN, 0);
        IpcIoPushString(&request, buff);
        int ret = proxy->Invoke((IClientProxy *)proxy, ID_ASYNCCALLBACK, &request, &owner, CurrentCallback);
        return ret == EC_SUCCESS;
    }
  • Implement the factory method for creating the client proxy.

    void *DEMO_CreatClient(const char *service, const char *feature, uint32 size)
    {
        (void)service;
        (void)feature;
        uint32 len = size + sizeof(DemoClientEntry);
        uint8 *client = malloc(len);
        (void)memset_s(client, len, 0, len);
        DemoClientEntry *entry = (DemoClientEntry *)&client[size];
        entry->ver = ((uint16)CLIENT_PROXY_VER | (uint16)DEFAULT_VERSION);
        entry->ref = 1;
        entry->iUnknown.QueryInterface = IUNKNOWN_QueryInterface;
        entry->iUnknown.AddRef = IUNKNOWN_AddRef;
        entry->iUnknown.Release = IUNKNOWN_Release;
        entry->iUnknown.Invoke = NULL;
        entry->iUnknown.AsyncCall = AsyncCall;
        entry->iUnknown.AsyncTimeCall = AsyncTimeCall;
        entry->iUnknown.SyncCall = SyncCall;
        entry->iUnknown.AsyncCallBack = AsyncCallBack;
        return client;
    }
    void DEMO_DestroyClient(const char *service, const char *feature, void *iproxy)
    {
        free(iproxy);
    }
  • Register the factory method of the client proxy with Samgr.

    SAMGR_RegisterFactory(EXAMPLE_SERVICE, EXAMPLE_FEATURE, DEMO_CreatClient, DEMO_DestroyClient);
  • Obtain the external API of the service in another process.

    DemoClientProxy *demoApi = NULL;
    IUnknown *iUnknown = SAMGR_GetInstance()->GetFeatureApi(EXAMPLE_SERVICE, EXAMPLE_FEATURE);
    if (iUnknown == NULL) {
        return NULL;
    }
    int result = iUnknown->QueryInterface(iUnknown, DEFAULT_VERSION, (void **)&demoApi);
    if (result != 0 || demoApi == NULL) {
        return NULL;
    }
  • Invoke the client proxy API of the service in another process.

    if (demoApi->AsyncCallBack == NULL) {
        return NULL;
    }
    demoApi->AsyncCallBack((IUnknown *)demoApi,
                           "I wanna async call callback good result!", NULL, AsyncHandler);
  • Release the API.

    int32 ref = demoApi->Release((IUnknown *)demoApi);

Repositories Involved

Samgr

systemabilitymgr_samgr_lite

systemabilitymgr_samgr

systemabilitymgr_safwk

systemabilitymgr_safwk_lite

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