mirror of https://gitee.com/bigwinds/arangodb
261 lines
7.3 KiB
C++
261 lines
7.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Achim Brandt
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#include "GeneralCommTask.h"
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#include "Basics/HybridLogicalClock.h"
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#include "Basics/MutexLocker.h"
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#include "Basics/StaticStrings.h"
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#include "Basics/StringBuffer.h"
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#include "GeneralServer/GeneralServer.h"
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#include "GeneralServer/GeneralServerFeature.h"
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#include "GeneralServer/RestHandler.h"
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#include "GeneralServer/RestHandlerFactory.h"
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#include "Logger/Logger.h"
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#include "Scheduler/Scheduler.h"
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#include "Scheduler/SchedulerFeature.h"
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using namespace arangodb;
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using namespace arangodb::basics;
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using namespace arangodb::rest;
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GeneralCommTask::GeneralCommTask(GeneralServer* server, TRI_socket_t socket,
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ConnectionInfo&& info, double keepAliveTimeout)
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: Task("GeneralCommTask"),
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SocketTask(socket, keepAliveTimeout),
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_server(server),
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_connectionInfo(std::move(info)) {
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LOG(TRACE) << "connection established, client "
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<< TRI_get_fd_or_handle_of_socket(socket) << ", server ip "
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<< _connectionInfo.serverAddress << ", server port "
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<< _connectionInfo.serverPort << ", client ip "
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<< _connectionInfo.clientAddress << ", client port "
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<< _connectionInfo.clientPort;
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}
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GeneralCommTask::~GeneralCommTask() {
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LOG(TRACE) << "connection closed, client "
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<< TRI_get_fd_or_handle_of_socket(_commSocket);
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for (auto& i : _writeBuffers) {
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delete i;
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}
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for (auto& i : _writeBuffersStats) {
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TRI_ReleaseRequestStatistics(i);
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}
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clearRequest();
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}
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void GeneralCommTask::signalTask(TaskData* data) {
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// data response
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if (data->_type == TaskData::TASK_DATA_RESPONSE) {
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data->RequestStatisticsAgent::transferTo(this);
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GeneralResponse* response = data->_response.get();
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if (response != nullptr) {
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processResponse(response);
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processRead();
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} else {
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handleSimpleError(GeneralResponse::ResponseCode::SERVER_ERROR);
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}
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}
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// buffer response
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else if (data->_type == TaskData::TASK_DATA_BUFFER) {
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data->RequestStatisticsAgent::transferTo(this);
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HttpResponse response(GeneralResponse::ResponseCode::OK);
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velocypack::Slice slice(data->_buffer->data());
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response.setPayload(_request, slice, true, VPackOptions::Defaults);
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processResponse(&response);
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processRead();
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}
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// data chunk
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else if (data->_type == TaskData::TASK_DATA_CHUNK) {
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handleChunk(data->_data.c_str(), data->_data.size());
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}
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// do not know, what to do - give up
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else {
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_scheduler->destroyTask(this);
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}
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}
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bool GeneralCommTask::handleRead() {
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bool res = true;
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if (!_closeRequested) {
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res = fillReadBuffer();
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// process as much data as we got; there might be more than one
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// request in the buffer
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while (processRead()) {
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if (_closeRequested) {
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break;
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}
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}
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} else {
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// if we don't close here, the scheduler thread may fall into a
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// busy wait state, consuming 100% CPU!
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_clientClosed = true;
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}
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if (_clientClosed) {
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res = false;
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} else if (!res) {
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_clientClosed = true;
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}
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return res;
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}
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void GeneralCommTask::fillWriteBuffer() {
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if (!hasWriteBuffer() && !_writeBuffers.empty()) {
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StringBuffer* buffer = _writeBuffers.front();
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_writeBuffers.pop_front();
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TRI_ASSERT(buffer != nullptr);
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TRI_request_statistics_t* statistics = _writeBuffersStats.front();
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_writeBuffersStats.pop_front();
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setWriteBuffer(buffer, statistics);
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}
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}
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void GeneralCommTask::executeRequest(GeneralRequest* request,
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GeneralResponse* response) {
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// create a handler for this request
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WorkItem::uptr<RestHandler> handler(
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GeneralServerFeature::HANDLER_FACTORY->createHandler(request, response));
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if (handler == nullptr) {
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LOG(TRACE) << "no handler is known, giving up";
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clearRequest();
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delete response;
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handleSimpleError(GeneralResponse::ResponseCode::NOT_FOUND);
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return;
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}
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handler->setTaskId(_taskId, _loop);
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// check for an async request
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bool found = false;
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std::string const& asyncExecution =
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request->header(StaticStrings::Async, found);
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// the responsibility for the request has been moved to the handler
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// TODO(fc) _request should
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_request = nullptr;
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// async execution
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bool ok = false;
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if (found && (asyncExecution == "true" || asyncExecution == "store")) {
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requestStatisticsAgentSetAsync();
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uint64_t jobId = 0;
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if (asyncExecution == "store") {
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// persist the responses
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ok = _server->handleRequestAsync(this, handler, &jobId);
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} else {
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// don't persist the responses
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ok = _server->handleRequestAsync(this, handler, nullptr);
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}
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if (ok) {
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HttpResponse response(GeneralResponse::ResponseCode::ACCEPTED);
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if (jobId > 0) {
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// return the job id we just created
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response.setHeaderNC(StaticStrings::AsyncId, StringUtils::itoa(jobId));
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}
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processResponse(&response);
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return;
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}
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}
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// synchronous request
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else {
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ok = _server->handleRequest(this, handler);
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}
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if (!ok) {
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handleSimpleError(GeneralResponse::ResponseCode::SERVER_ERROR);
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}
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}
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void GeneralCommTask::processResponse(GeneralResponse* response) {
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if (response == nullptr) {
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handleSimpleError(GeneralResponse::ResponseCode::SERVER_ERROR);
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} else {
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addResponse(response, false);
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}
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}
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void GeneralCommTask::handleSimpleError(GeneralResponse::ResponseCode code) {
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HttpResponse response(code);
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addResponse(&response, true);
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}
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void GeneralCommTask::handleSimpleError(
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GeneralResponse::ResponseCode responseCode, int errorNum,
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std::string const& errorMessage) {
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HttpResponse response(responseCode);
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VPackBuilder builder;
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builder.openObject();
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builder.add(StaticStrings::Error, VPackValue(true));
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builder.add(StaticStrings::ErrorNum, VPackValue(errorNum));
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builder.add(StaticStrings::ErrorMessage, VPackValue(errorMessage));
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builder.add(StaticStrings::Code, VPackValue((int)responseCode));
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builder.close();
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try {
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response.setPayload(_request, builder.slice(), true,
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VPackOptions::Defaults);
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clearRequest();
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processResponse(&response);
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} catch (...) {
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addResponse(&response, true);
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}
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}
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// TODO(fc) MOVE TO SOCKET TASK
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bool GeneralCommTask::handleEvent(EventToken token, EventType events) {
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// destroy this task if client is closed
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bool result = SocketTask::handleEvent(token, events);
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if (_clientClosed) {
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_scheduler->destroyTask(this);
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}
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return result;
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}
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