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#pragma once
#include <poll.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <sstream>
#include <string>
#include <libshm/alloc_info.h>
#include <libshm/err.h>
class Socket {
public:
int socket_fd;
protected:
Socket() {
SYSCHECK_ERR_RETURN_NEG1(socket_fd = socket(AF_UNIX, SOCK_STREAM, 0));
}
Socket(const Socket& other) = delete;
Socket(Socket&& other) noexcept : socket_fd(other.socket_fd) {
other.socket_fd = -1;
};
explicit Socket(int fd) : socket_fd(fd) {}
virtual ~Socket() {
if (socket_fd != -1)
close(socket_fd);
}
struct sockaddr_un prepare_address(const char* path) {
struct sockaddr_un address;
address.sun_family = AF_UNIX;
strcpy(address.sun_path, path);
return address;
}
// Implemented based on https://man7.org/linux/man-pages/man7/unix.7.html
size_t address_length(struct sockaddr_un address) {
return offsetof(sockaddr_un, sun_path) + strlen(address.sun_path) + 1;
}
void recv(void* _buffer, size_t num_bytes) {
char* buffer = (char*)_buffer;
size_t bytes_received = 0;
ssize_t step_received;
struct pollfd pfd = {0};
pfd.fd = socket_fd;
pfd.events = POLLIN;
while (bytes_received < num_bytes) {
SYSCHECK_ERR_RETURN_NEG1(poll(&pfd, 1, 1000));
if (pfd.revents & POLLIN) {
SYSCHECK_ERR_RETURN_NEG1(
step_received =
::read(socket_fd, buffer, num_bytes - bytes_received));
if (step_received == 0)
throw std::runtime_error("Other end has closed the connection");
bytes_received += step_received;
buffer += step_received;
} else if (pfd.revents & (POLLERR | POLLHUP)) {
throw std::runtime_error(
"An error occurred while waiting for the data");
} else {
throw std::runtime_error(
"Shared memory manager connection has timed out");
}
}
}
void send(const void* _buffer, size_t num_bytes) {
const char* buffer = (const char*)_buffer;
size_t bytes_sent = 0;
ssize_t step_sent;
while (bytes_sent < num_bytes) {
SYSCHECK_ERR_RETURN_NEG1(
step_sent = ::write(socket_fd, buffer, num_bytes));
bytes_sent += step_sent;
buffer += step_sent;
}
}
};
class ManagerSocket : public Socket {
public:
explicit ManagerSocket(int fd) : Socket(fd) {}
AllocInfo receive() {
AllocInfo info;
recv(&info, sizeof(info));
return info;
}
void confirm() {
send("OK", 2);
}
};
class ManagerServerSocket : public Socket {
public:
explicit ManagerServerSocket(const std::string& path) {
socket_path = path;
try {
struct sockaddr_un address = prepare_address(path.c_str());
size_t len = address_length(address);
SYSCHECK_ERR_RETURN_NEG1(
bind(socket_fd, (struct sockaddr*)&address, len));
SYSCHECK_ERR_RETURN_NEG1(listen(socket_fd, 10));
} catch (std::exception& e) {
SYSCHECK_ERR_RETURN_NEG1(close(socket_fd));
throw;
}
}
void remove() {
struct stat file_stat;
if (fstat(socket_fd, &file_stat) == 0)
SYSCHECK_ERR_RETURN_NEG1(unlink(socket_path.c_str()));
}
virtual ~ManagerServerSocket() {
unlink(socket_path.c_str());
}
ManagerSocket accept() {
int client_fd;
struct sockaddr_un addr;
socklen_t addr_len = sizeof(addr);
SYSCHECK_ERR_RETURN_NEG1(
client_fd = ::accept(socket_fd, (struct sockaddr*)&addr, &addr_len));
return ManagerSocket(client_fd);
}
std::string socket_path;
};
class ClientSocket : public Socket {
public:
explicit ClientSocket(const std::string& path) {
try {
struct sockaddr_un address = prepare_address(path.c_str());
size_t len = address_length(address);
SYSCHECK_ERR_RETURN_NEG1(
connect(socket_fd, (struct sockaddr*)&address, len));
} catch (std::exception& e) {
SYSCHECK_ERR_RETURN_NEG1(close(socket_fd));
throw;
}
}
void register_allocation(AllocInfo& info) {
char buffer[3] = {0, 0, 0};
send(&info, sizeof(info));
recv(buffer, 2);
if (strcmp(buffer, "OK") != 0)
throw std::runtime_error(
"Shared memory manager didn't respond with an OK");
}
void register_deallocation(AllocInfo& info) {
send(&info, sizeof(info));
}
};
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