dataShare/src/async_call.cpp

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "async_call.h"

#include "datashare_log.h"
#include "napi_common_data.h"

namespace OHOS::DataShare {
AsyncCall::AsyncCall(napi_env env, napi_callback_info info, std::shared_ptr<Context> context)
    : env_(env)
{
    context_ = new AsyncContext();
    size_t argc = ARGS_MAX_COUNT;
    napi_value self = nullptr;
    napi_value argv[ARGS_MAX_COUNT] = {nullptr};
    NAPI_CALL_RETURN_VOID(env, napi_get_cb_info(env, info, &argc, argv, &self, nullptr));
    napi_valuetype valueType = napi_undefined;
    napi_typeof(env, argv[argc - 1], &valueType);
    if (valueType == napi_function) {
        napi_create_reference(env, argv[argc - 1], 1, &context_->callback);
        argc = argc - 1;
    }
    napi_status status = (*context)(env, argc, argv, self);
    NAPI_ASSERT_ERRCODE(env, status == napi_ok, context->error);
    context_->ctx = std::move(context);
    napi_create_reference(env, self, 1, &context_->self);
}

AsyncCall::~AsyncCall()
{
    if (context_ == nullptr) {
        return;
    }

    DeleteContext(env_, context_);
    context_ = nullptr;
}

napi_value AsyncCall::Call(napi_env env, Context::ExecAction exec)
{
    if ((context_ == nullptr) || (context_->ctx == nullptr)) {
        LOG_DEBUG("context_ or context_->ctx is null");
        return nullptr;
    }
    LOG_DEBUG("async call exec");
    context_->ctx->exec_ = std::move(exec);
    napi_value promise = nullptr;
    if (context_->callback == nullptr) {
        napi_create_promise(env, &context_->defer, &promise);
    } else {
        napi_get_undefined(env, &promise);
    }
    napi_async_work work = context_->work;
    napi_value resource = nullptr;
    napi_create_string_utf8(env, "AsyncCall", NAPI_AUTO_LENGTH, &resource);
    napi_create_async_work(env, nullptr, resource, AsyncCall::OnExecute, AsyncCall::OnComplete, context_, &work);
    context_->work = work;
    context_ = nullptr;
    napi_queue_async_work(env, work);
    LOG_DEBUG("async call exec");
    return promise;
}

napi_value AsyncCall::SyncCall(napi_env env, AsyncCall::Context::ExecAction exec)
{
    if ((context_ == nullptr) || (context_->ctx == nullptr)) {
        LOG_DEBUG("context_ or context_->ctx is null");
        return nullptr;
    }
    context_->ctx->exec_ = std::move(exec);
    napi_value promise = nullptr;
    if (context_->callback == nullptr) {
        napi_create_promise(env, &context_->defer, &promise);
    } else {
        napi_get_undefined(env, &promise);
    }
    AsyncCall::OnExecute(env, context_);
    AsyncCall::OnComplete(env, napi_ok, context_);
    return promise;
}

void AsyncCall::OnExecute(napi_env env, void *data)
{
    LOG_DEBUG("run the async runnable");
    AsyncContext *context = reinterpret_cast<AsyncContext *>(data);
    context->ctx->Exec();
}

void SetBusinessError(napi_env env, napi_value *businessError, std::shared_ptr<Error> error)
{
    napi_create_object(env, businessError);
    if (error->GetCode() != EXCEPTION_INNER) {
        napi_value code = nullptr;
        napi_value msg = nullptr;
        napi_create_int32(env, error->GetCode(), &code);
        napi_create_string_utf8(env, error->GetMessage().c_str(), NAPI_AUTO_LENGTH, &msg);
        napi_set_named_property(env, *businessError, "code", code);
        napi_set_named_property(env, *businessError, "message", msg);
    }
}

void AsyncCall::OnComplete(napi_env env, napi_status status, void *data)
{
    LOG_DEBUG("run the js callback function");
    AsyncContext *context = reinterpret_cast<AsyncContext *>(data);
    napi_value output = nullptr;
    napi_status runStatus = (*context->ctx)(env, &output);
    napi_value result[ARG_BUTT] = { 0 };
    if (status == napi_ok && runStatus == napi_ok) {
        napi_get_undefined(env, &result[ARG_ERROR]);
        if (output != nullptr) {
            result[ARG_DATA] = output;
        } else {
            napi_get_undefined(env, &result[ARG_DATA]);
        }
    } else {
        napi_value businessError = nullptr;
        SetBusinessError(env, &businessError, context->ctx->error);
        result[ARG_ERROR] = businessError;
        napi_get_undefined(env, &result[ARG_DATA]);
    }
    if (context->defer != nullptr) {
        // promise
        if (status == napi_ok && runStatus == napi_ok) {
            napi_resolve_deferred(env, context->defer, result[ARG_DATA]);
        } else {
            napi_reject_deferred(env, context->defer, result[ARG_ERROR]);
        }
    } else {
        // callback
        napi_value callback = nullptr;
        napi_get_reference_value(env, context->callback, &callback);
        napi_value returnValue;
        napi_call_function(env, nullptr, callback, ARG_BUTT, result, &returnValue);
    }
    DeleteContext(env, context);
}

void AsyncCall::DeleteContext(napi_env env, AsyncContext *context)
{
    if (env != nullptr) {
        napi_delete_reference(env, context->callback);
        napi_delete_reference(env, context->self);
        napi_delete_async_work(env, context->work);
    }
    if (context != nullptr && context->ctx != nullptr) {
        context->ctx->exec_ = nullptr;
        context->ctx->input_ = nullptr;
        context->ctx->output_ = nullptr;
        context->ctx = nullptr;
    }
    delete context;
}
}