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#include "plop.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <lauxlib.h>
#include <lua.h>
#include "http.h"
#include "request.h"
#include "response.h"
/// Tries to create, bind and start listening on INET server socket.
/// \param node Hostname
/// \param service Port
/// \return File descriptor of the socket or -1 in case of an error
/// \see getaddrinfo(3)
// TODO: Handle UNIX sockets
int make_server(const char * node, const char * service)
{
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_PASSIVE,
};
struct addrinfo * result;
struct addrinfo * it;
if (0 != getaddrinfo(node, service, &hints, &result))
{
return -1; // TODO: Handle errors properly
}
int server;
int optval = 1;
for (it = result; it != NULL; it = it->ai_next)
{
server = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (-1 == server)
continue;
if (-1 == setsockopt(server, SOL_SOCKET, SO_REUSEADDR, (char *) &optval, sizeof(optval)))
{
close(server);
continue;
}
if (-1 == fcntl(server, F_SETFL, (fcntl(server, F_GETFL, 0) | O_NONBLOCK)))
{
close(server);
continue;
}
if (0 == bind(server, it->ai_addr,it->ai_addrlen))
break;
close(server);
}
if (it == NULL)
{
server = -1; // TODO: Handle errors properly
}
freeaddrinfo(result);
if (-1 == server || -1 == listen(server, 5))
{
return -1; // TODO: Handle errors properly
}
return server;
}
// TODO: Write documentation for load_handler
int load_handler(lua_State * L, const char * path)
{
lua_getglobal(L, "package");
lua_pushstring(L, "loaded");
int result = lua_rawget(L, -2);
if (LUA_TTABLE != result)
{
lua_pop(L, 2);
return LUA_ERRRUN;
}
result = luaL_loadfile(L, path) || lua_pcall(L, 0, 1, 0);
if (LUA_OK != result)
{
lua_pop(L, 3);
return result;
}
lua_pushstring(L, "handler");
lua_pushvalue(L, -2);
lua_rawset(L, -4);
lua_setglobal(L, "handler");
lua_pop(L, 1);
return LUA_OK;
}
/// Progresses the connection for a client and shifts it back in the array.
/// `pfd` must be at least `shift_by + 1`-th element of the array.
/// \param L Server's Lua state
/// \param pfd Element in array processed by poll
/// \param request Pointer to request context associated with current client
/// \param shift_by Element will be moved by in array this many indices
/// \return Shift value for next handler
/// \see poll(2)
int handle_client(lua_State * L, struct pollfd * pfd, struct request ** request, const int shift_by)
{
if (0 == pfd->revents)
{
return shift_by;
}
if (~(POLLIN | POLLOUT) & pfd->revents)
{
return -1; // TODO: Handle errors properly
}
if (-1 == parse_request(L, pfd->fd, request))
{
respond_only_status(pfd->fd, STATUS_BAD_REQUEST);
return -1; // TODO: Handle errors properly
}
// TODO: Push the handler to stack earlier to avoid shifting it.
lua_getglobal((*request)->lua, "handler");
lua_insert((*request)->lua, 1);
lua_call((*request)->lua, 5, 1);
size_t length;
const char * body = lua_tolstring((*request)->lua, -1, &length);
if (NULL != body)
{
respond_with_body(pfd->fd, STATUS_OK, body, (int) length);
}
else
{
respond_only_status(pfd->fd, STATUS_INTERNAL_SERVER_ERROR);
}
close(pfd->fd);
(pfd - shift_by)->fd = -1;
(pfd - shift_by)->events = pfd->events;
if (NULL != *request)
{
free_request(L, *request);
*request = NULL;
}
return shift_by + 1;
}
/// Accepts awaiting connections if any.
/// \param fdv Array of descriptors for poll
/// \param fdc Number of valid descriptors in the array including the server
/// \param size Size limit for the array
/// \return Number of valid descriptors in the array or -1 if an error occurred.
/// \see poll(2)
int handle_server(struct pollfd * fdv, int fdc, const int size)
{
if (0 == fdv[0].revents)
{
return fdc;
}
while (size > fdc + 1 && -1 != (fdv[fdc].fd = accept(fdv[0].fd, NULL, NULL)))
{
fdv[fdc].events = POLLIN | POLLOUT;
fdc++;
}
if (EWOULDBLOCK != errno && EAGAIN != errno)
{
return -1;
}
return fdc;
}
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