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#include <iostream>
#include <thread>
#include <mutex>
#include <vector>
#include <queue>
#include <functional>
#include <sys/socket.h>
#include <sys/un.h>
#include <poll.h>
#include <fcntl.h>
#include <unistd.h>
#include <cstring>
#ifdef __APPLE__
#define SOCKET_PATH_MAX 104
#else
#define SOCKET_PATH_MAX 108
#endif
class UnixSocketServer {
public:
using MessageHandler = std::function<void(const std::string&)>;
UnixSocketServer(const std::string& path) :
socket_path_(path.substr(0, SOCKET_PATH_MAX - 1)),
running_(false) {}
~UnixSocketServer() { stop(); }
void start(MessageHandler handler) {
if (running_) return;
server_fd_ = create_socket();
setup_socket();
running_ = true;
server_thread_ = std::thread(&UnixSocketServer::event_loop, this, handler);
}
void stop() {
running_ = false;
if (server_thread_.joinable()) {
server_thread_.join();
}
cleanup();
}
void send(const std::string& message) {
std::lock_guard<std::mutex> lock(clients_mutex_);
for (auto& client : clients_) {
queue_message(client.fd, message);
}
}
private:
struct Client {
int fd;
std::queue<std::string> write_queue;
};
int create_socket() {
int fd = ::socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1) throw std::runtime_error("::socket() failed");
return fd;
}
void setup_socket() {
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, socket_path_.c_str(), sizeof(addr.sun_path) - 1);
unlink(socket_path_.c_str());
if (bind(server_fd_, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
close(server_fd_);
throw std::runtime_error("bind() failed");
}
if (listen(server_fd_, 5) == -1) {
close(server_fd_);
throw std::runtime_error("listen() failed");
}
set_nonblocking(server_fd_);
}
void set_nonblocking(int fd) {
int flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
void event_loop(MessageHandler handler) {
std::vector<struct pollfd> fds;
fds.push_back({server_fd_, POLLIN, 0});
while (running_) {
int ready = ::poll(fds.data(), fds.size(), 250);
if (ready == -1) break;
for (size_t i = 0; i < fds.size(); ++i) {
if (fds[i].revents & POLLIN) {
if (fds[i].fd == server_fd_) {
accept_new_connection(fds);
} else {
handle_client_input(fds[i].fd, handler);
}
}
if (fds[i].revents & POLLOUT) {
handle_client_output(fds[i].fd);
}
}
}
}
void accept_new_connection(std::vector<struct pollfd>& fds) {
int client_fd = accept(server_fd_, nullptr, nullptr);
if (client_fd == -1) return;
set_nonblocking(client_fd);
fds.push_back({client_fd, POLLIN | POLLOUT, 0});
std::lock_guard<std::mutex> lock(clients_mutex_);
clients_.push_back({client_fd, {}});
}
void handle_client_input(int fd, MessageHandler handler) {
char buffer[4096];
ssize_t count = recv(fd, buffer, sizeof(buffer), 0);
if (count > 0) {
handler(std::string(buffer, count));
} else {
remove_client(fd);
}
}
void handle_client_output(int fd) {
std::lock_guard<std::mutex> lock(clients_mutex_);
for (auto& client : clients_) {
if (client.fd == fd && !client.write_queue.empty()) {
const std::string& msg = client.write_queue.front();
ssize_t sent = ::send(fd, msg.data(), msg.size(), 0);
if (sent > 0) {
client.write_queue.pop();
}
}
}
}
void queue_message(int fd, const std::string& message) {
std::lock_guard<std::mutex> lock(clients_mutex_);
for (auto& client : clients_) {
if (client.fd == fd) {
client.write_queue.push(message);
return;
}
}
}
void remove_client(int fd) {
std::lock_guard<std::mutex> lock(clients_mutex_);
clients_.erase(
std::remove_if(clients_.begin(), clients_.end(),
[fd](const Client& c) { return c.fd == fd; }),
clients_.end()
);
close(fd);
}
void cleanup() {
close(server_fd_);
unlink(socket_path_.c_str());
}
std::string socket_path_;
int server_fd_ = -1;
std::atomic<bool> running_;
std::thread server_thread_;
std::mutex clients_mutex_;
std::vector<Client> clients_;
};
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