Query.cpp

/*
    Copyright (c) 2020 TOSHIBA Digital Solutions Corporation.

    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 "Query.h"

namespace griddb {

Napi::FunctionReference Query::constructor;

Napi::Object Query::init(Napi::Env env, Napi::Object exports) {
    Napi::HandleScope scope(env);

    Napi::Function func = DefineClass(env, "Query",
            { InstanceMethod("fetch", &Query::fetch),
              InstanceMethod("setFetchOptions", &Query::setFetchOptions),
              InstanceMethod("getRowSet", &Query::getRowSet),
            });

    constructor = Napi::Persistent(func);
    constructor.SuppressDestruct();
    exports.Set("Query", func);
    return exports;
}

Query::Query(const Napi::CallbackInfo &info) :
        Napi::ObjectWrap<Query>(info) {
    Napi::Env env = info.Env();
    Napi::HandleScope scope(env);
    if (info.Length() != 3 || !info[0].IsExternal() || !info[1].IsExternal()
            || !info[2].IsExternal()) {
        // Throw error
        THROW_EXCEPTION_WITH_STR(env, "Wrong arguments", NULL)
        return;
    }
    this->mQuery = info[0].As<Napi::External<GSQuery>>().Data();
    this->mContainerInfo = info[1].As<Napi::External<GSContainerInfo>>().Data();
    this->mRow = info[2].As<Napi::External<GSRow>>().Data();
}

Napi::Value Query::fetch(const Napi::CallbackInfo &info) {
    Napi::Env env = info.Env();
    Napi::Promise::Deferred deferred = Napi::Promise::Deferred::New(env);
    GSRowSet *gsRowSet;
    // Call method from C-Api.
    GSBool gsForUpdate = GS_FALSE;
    GSResult ret = gsFetch(mQuery, gsForUpdate, &gsRowSet);

    // Check ret, if error, throw exception
    if (!GS_SUCCEEDED(ret)) {
        PROMISE_REJECT_WITH_ERROR_CODE(deferred, env, ret, mQuery)
    }

    // Create new RowSet object
    Napi::EscapableHandleScope scope(env);
    auto rowsetPtr = Napi::External<GSRowSet>::New(env, gsRowSet);
    auto gsContainerInfoPtr =
            Napi::External<GSContainerInfo>::New(env, mContainerInfo);
    auto gsRowPtr = Napi::External<GSRow>::New(env, mRow);
    Napi::Value rowsetWrapper = scope.Escape(RowSet::constructor.New({
            rowsetPtr, gsContainerInfoPtr, gsRowPtr })).ToObject();
    deferred.Resolve(rowsetWrapper);
    return deferred.Promise();
}

Query::~Query() {
    if (mQuery) {
        gsCloseQuery(&mQuery);
        mQuery = NULL;
    }
}

void Query::setFetchOptions(const Napi::CallbackInfo &info) {
    Napi::Env env = info.Env();

    if (info.Length() > 1 || !info[0].IsObject()) {
        THROW_EXCEPTION_WITH_STR(env, "Wrong arguments", mQuery)
        return;
    }
    Napi::Object input = info[0].As<Napi::Object>();

    int limit = 0;
    if (input.Has("limit")) {
        limit = input.Get("limit").As<Napi::Number>().Int32Value();
    }

    GSResult ret;
    ret = gsSetFetchOption(mQuery, GS_FETCH_LIMIT, &limit, GS_TYPE_INTEGER);
    if (!GS_SUCCEEDED(ret)) {
        THROW_EXCEPTION_WITH_CODE(env, ret, mQuery)
        return;
    }
#if GS_COMPATIBILITY_SUPPORT_4_0
    bool partial = true;  // default value rowKey = true
    if (input.Has("partial")) {
        partial = input.Get("partial").As<Napi::Boolean>().ToBoolean();
    }
    // Need to call gsSetFetchOption as many as the number of options
    ret = gsSetFetchOption(mQuery, GS_FETCH_PARTIAL_EXECUTION, &partial,
            GS_TYPE_BOOL);
    if (!GS_SUCCEEDED(ret)) {
        THROW_EXCEPTION_WITH_CODE(env, ret, mQuery)
        return;
    }
#endif
}

Napi::Value Query::getRowSet(const Napi::CallbackInfo &info) {
    Napi::Env env = info.Env();
    Napi::Promise::Deferred deferred = Napi::Promise::Deferred::New(env);
    GSRowSet *gsRowSet;
    GSResult ret = gsGetRowSet(mQuery, &gsRowSet);

    // Check ret, if error, throw exception
    if (!GS_SUCCEEDED(ret)) {
        PROMISE_REJECT_WITH_ERROR_CODE(deferred, env, ret, mQuery)
    }
    auto rowset_ptr = Napi::External<GSRowSet>::New(env, gsRowSet);
    Napi::EscapableHandleScope scope(env);
    Napi::Value rowset_wrapper = scope.Escape(RowSet::constructor.New({
            rowset_ptr })).ToObject();
    deferred.Resolve(rowset_wrapper);
    return deferred.Promise();
}

}  // namespace griddb