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/*
* Copyright (c) 2011-2015, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "RemoteProcessorServer.h"
#include "ListeningSocket.h"
#include "FullIo.hpp"
#include <iostream>
#include <memory>
#include <assert.h>
#include <poll.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "RequestMessage.h"
#include "AnswerMessage.h"
#include "RemoteCommandHandler.h"
using std::string;
CRemoteProcessorServer::CRemoteProcessorServer(uint16_t uiPort, IRemoteCommandHandler* pCommandHandler) :
_uiPort(uiPort), _pCommandHandler(pCommandHandler), _bIsStarted(false), _pListeningSocket(NULL), _ulThreadId(0)
{
}
CRemoteProcessorServer::~CRemoteProcessorServer()
{
stop();
}
// State
bool CRemoteProcessorServer::start(string &error)
{
assert(!_bIsStarted);
if (pipe(_aiInbandPipe) == -1) {
error = "Could not create a pipe for remote processor communication: ";
error += strerror(errno);
return false;
}
// Create server socket
std::auto_ptr<CListeningSocket> pListeningSocket(new CListeningSocket);
if (!pListeningSocket->listen(_uiPort, error)) {
return false;
}
// Thread needs to access to the listning socket.
_pListeningSocket = pListeningSocket.get();
// Create thread
errno = pthread_create(&_ulThreadId, NULL, thread_func, this);
if (errno != 0) {
error = "Could not create a remote processor thread: ";
error += strerror(errno);
return false;
}
// State
_bIsStarted = true;
pListeningSocket.release();
return true;
}
void CRemoteProcessorServer::stop()
{
// Check state
if (!_bIsStarted) {
return;
}
// Cause exiting of the thread
uint8_t ucData = 0;
if (not utility::fullWrite(_aiInbandPipe[1], &ucData, sizeof(ucData))) {
std::cerr << "Could not query command processor thread to terminate: "
"fail to write on inband pipe: "
<< strerror(errno) << std::endl;
assert(false);
}
// Join thread
errno = pthread_join(_ulThreadId, NULL);
if (errno != 0) {
std::cout << "Could not join with remote processor thread: "
<< strerror(errno) << std::endl;
assert(false);
}
_bIsStarted = false;
// Remove listening socket
delete _pListeningSocket;
_pListeningSocket = NULL;
}
bool CRemoteProcessorServer::isStarted() const
{
return _bIsStarted;
}
// Thread
void* CRemoteProcessorServer::thread_func(void* pData)
{
reinterpret_cast<CRemoteProcessorServer*>(pData)->run();
return NULL;
}
void CRemoteProcessorServer::run()
{
struct pollfd _aPollFds[2];
bzero(_aPollFds, sizeof(_aPollFds));
// Build poll elements
_aPollFds[0].fd = _pListeningSocket->getFd();
_aPollFds[1].fd = _aiInbandPipe[0];
_aPollFds[0].events = POLLIN;
_aPollFds[1].events = POLLIN;
while (true) {
poll(_aPollFds, 2, -1);
if (_aPollFds[0].revents & POLLIN) {
// New incoming connection
handleNewConnection();
}
if (_aPollFds[1].revents & POLLIN) {
// Consume exit request
uint8_t ucData;
if (not utility::fullRead(_aiInbandPipe[0], &ucData, sizeof(ucData))) {
std::cerr << "Remote processor could not receive exit request"
<< strerror(errno) << std::endl;
assert(false);
}
// Exit
return;
}
}
}
// New connection
void CRemoteProcessorServer::handleNewConnection()
{
const std::auto_ptr<CSocket> clientSocket(_pListeningSocket->accept());
if (clientSocket.get() == NULL) {
return;
}
// Process all incoming requests from the client
while (true) {
// Process requests
// Create command message
CRequestMessage requestMessage;
string strError;
///// Receive command
CRequestMessage::Result res;
res = requestMessage.serialize(clientSocket.get(), false, strError);
switch (res) {
case CRequestMessage::error:
std::cout << "Error while receiving message: " << strError << std::endl;
// fall through
case CRequestMessage::peerDisconnected:
// Consider peer disconnection as normal, no log
return; // Bail out
case CRequestMessage::success:
break; // No error, continue
}
// Actually process the request
bool bSuccess;
string strResult;
if (_pCommandHandler) {
bSuccess = _pCommandHandler->remoteCommandProcess(requestMessage, strResult);
} else {
strResult = "No handler!";
bSuccess = false;
}
// Send back answer
// Create answer message
CAnswerMessage answerMessage(strResult, bSuccess);
///// Send answer
res = answerMessage.serialize(clientSocket.get(), true, strError);
switch (res) {
case CRequestMessage::peerDisconnected:
// Peer should not disconnect while waiting for an answer
// Fall through to log the error and bail out
case CRequestMessage::error:
std::cout << "Error while receiving message: " << strError << std::endl;
return; // Bail out
case CRequestMessage::success:
break; // No error, continue
}
}
}
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