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//
// Created by Gyuhwan Park on 2022/05/24.
//
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <cassert>
#include <fcntl.h>
#include <poll.h>
extern "C" {
#include "parse.h"
#include "defines.h"
}
#include "IPCConnection.hpp"
IPCConnection::IPCConnection(std::string socketPath):
_socket(socketPath),
_isWorkerTerminated(false),
_messageId(0),
_ackId(0)
{
}
void IPCConnection::connect() {
_socket.connect();
// enable non-blocking io
auto flags = fcntl(_socket.descriptor(), F_GETFL, 0);
if (fcntl(_socket.descriptor(), F_SETFL, flags | O_NONBLOCK)) {
throw SystemCallException(errno, "fcntl");
}
_workerThread = std::thread(&IPCConnection::workerLoop, this);
}
void IPCConnection::disconnect() {
_isWorkerTerminated = true;
if (_workerThread.joinable()) {
_workerThread.join();
}
_socket.close();
}
std::unique_ptr<ULIPCHeader, IPCConnection::MallocFreeDeleter> IPCConnection::nextHeader() {
return std::move(read<ULIPCHeader>(sizeof(ULIPCHeader)));
}
void IPCConnection::write(const void *pointer, size_t size) {
assert(pointer != nullptr);
assert(size > 0);
std::scoped_lock<std::mutex> scopedWriteTasksLock(_writeTasksLock);
std::unique_ptr<uint8_t, MallocFreeDeleter> data(
(uint8_t *) malloc(size),
free
);
std::memcpy(data.get(), pointer, size);
_writeTasks.emplace(size, std::move(data));
}
void IPCConnection::workerLoop() {
const size_t MAX_READ_SIZE = 8192;
size_t readPos = 0;
std::unique_ptr<uint8_t> readBuffer;
pollfd pollFd {
_socket.descriptor(),
POLLIN | POLLOUT,
0
};
while (!_isWorkerTerminated) {
if (poll(&pollFd, 1, 1) < 0) {
throw SystemCallException(errno, "poll");
}
bool canRead = (pollFd.revents & POLLIN) > 0;
bool canWrite = (pollFd.revents & POLLOUT) > 0;
if (canWrite && !_writeTasks.empty()) {
auto &writeTask = _writeTasks.front();
if (_socket.write(writeTask.second.get(), writeTask.first) < 0) {
if (errno == EAGAIN) {
continue;
}
LOG(LOG_LEVEL_ERROR, "write() failed (errno=%d)", errno);
continue;
}
{
std::scoped_lock<std::mutex> scopedWriteTasksLock(_writeTasksLock);
_writeTasks.pop();
}
}
if (canRead && !_readTasks.empty()) {
auto &readTask = _readTasks.front();
auto &contentLength = readTask.first;
auto &promise = readTask.second;
if (readBuffer == nullptr) {
readPos = 0;
readBuffer = std::unique_ptr<uint8_t>(new uint8_t[contentLength]);
}
int readForBytes = std::min(
(size_t) MAX_READ_SIZE,
contentLength - readPos
);
size_t retval = _socket.read(readBuffer.get() + readPos, readForBytes);
if (retval < 0) {
if (errno == EAGAIN) {
continue;
} else {
throw SystemCallException(errno, "read");
}
}
readPos += retval;
if (readPos >= contentLength) {
promise.set_value(std::move(readBuffer));
{
std::scoped_lock<std::mutex> scopedReadTasksLock(_readTasksLock);
_readTasks.pop();
}
readBuffer = nullptr;
readPos = 0;
}
}
if (pollFd.revents & POLLHUP) {
LOG(LOG_LEVEL_WARNING, "POLLHUP bit set");
}
if (pollFd.revents & POLLERR) {
LOG(LOG_LEVEL_ERROR, "POLLERR bit set; closing connection");
break;
}
}
}
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