SimpleSendDataRequest.cc

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/*****************************************************************************
 *                                                                           *
 *  Copyright 2018 Rice University                                           *
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 *  Licensed under the Apache License, Version 2.0 (the "License");          *
 *  you may not use this file except in compliance with the License.         *
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 *      http://www.apache.org/licenses/LICENSE-2.0                           *
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 *  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.                                           *
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#ifndef SIMPLE_SEND_DATA_REQUEST_CC
#define SIMPLE_SEND_DATA_REQUEST_CC

#include "InterfaceFunctions.h"
#include "UseTemporaryAllocationBlock.h"

#ifndef MAX_RETRIES
#define MAX_RETRIES 5
#endif
#ifndef HEADER_SIZE
#define HEADER_SIZE 20
#endif

namespace pdb {

template <class RequestType,
          class DataType,
          class ResponseType,
          class ReturnType,
          class... RequestTypeParams>
ReturnType simpleSendDataRequest(PDBLoggerPtr myLogger,
                                 int port,
                                 std::string address,
                                 ReturnType onErr,
                                 size_t bytesForRequest,
                                 function<ReturnType(Handle<ResponseType>)> processResponse,
                                 Handle<Vector<DataType>> dataToSend,
                                 RequestTypeParams&&... args) {

    int retries = 0;

    while (retries <= MAX_RETRIES) {

        PDBCommunicator temp;
        string errMsg;
        bool success;

        if (temp.connectToInternetServer(myLogger, port, address, errMsg)) {
            myLogger->error(errMsg);
            myLogger->error("simpleSendDataRequest: not able to connect to server.\n");
            std::cout << "ERROR: can't connect to remote server with port =" << port
                      << " and address =" << address << std::endl;
            return onErr;
        }

        // build the request
        if (bytesForRequest < HEADER_SIZE) {
            std::cout << "ERROR: block size is too small" << std::endl;
            return onErr;
        }
        const UseTemporaryAllocationBlock tempBlock{bytesForRequest};
        Handle<RequestType> request = makeObject<RequestType>(args...);
        if (!temp.sendObject(request, errMsg)) {
            myLogger->error(errMsg);
            myLogger->error("simpleSendDataRequest: not able to send request to server.\n");
            if (retries < MAX_RETRIES) {
                retries++;
                continue;
            } else {
                return onErr;
            }
        }
        // now, send the data
        if (!temp.sendObject(dataToSend, errMsg)) {
            myLogger->error(errMsg);
            myLogger->error("simpleSendDataRequest: not able to send data to server.\n");
            if (retries < MAX_RETRIES) {
                retries++;
                continue;
            } else {
                return onErr;
            }
        }

        // get the response and process it
        size_t objectSize = temp.getSizeOfNextObject();
        if (objectSize == 0) {
            myLogger->error("simpleRequest: not able to get next object size");
            std::cout << "simpleRequest: not able to get next object size" << std::endl;
            if (retries < MAX_RETRIES) {
                retries++;
                continue;
            } else {
                return onErr;
            }
        }
        void* memory = malloc(objectSize);
        if (memory == nullptr) {
            myLogger->error(std::string("FATAL ERROR: not able to allocate memory with size=") +
                            std::to_string(objectSize));
            std::cout << "FATAL ERROR: not able to allocate memory" << std::endl;
            exit(-1);
        }
        ReturnType finalResult;
        {
            Handle<ResponseType> result = temp.getNextObject<ResponseType>(memory, success, errMsg);
            if (!success) {
                myLogger->error(errMsg);
                myLogger->error("simpleRequest: not able to get next object over the wire.\n");
                // JiaNote: we need free memory here!!!
                free(memory);
                if (retries < MAX_RETRIES) {
                    retries++;
                    continue;
                } else {
                    return onErr;
                }
            }

            finalResult = processResponse(result);
        }

        free(memory);
        return finalResult;
    }
    return onErr;
}
}
#endif