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#include "plop.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <lauxlib.h>
#include <lua.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;
}
/// Loads a file in path, executes it, then puts first result into package.loaded table and into global table.
/// \param L Lua state to load the handler into
/// \param path Path the script that returns handle is located at
/// \param LUA_OK if successful, appropriate Lua error otherwise
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;
}
/// Handles client events.
/// \param L Server's Lua state
/// \param event Event for client
/// \return -1 if an error occured
int handle_client(lua_State * L, struct epoll_event * event)
{
// TODO: Temporary shenanigans to avoid too much changes.
struct request * r = (struct request *) event->data.ptr;
struct request ** request = &r;
if (-1 == parse_request(L, (*request)->fd, request))
{
lua_newtable((*request)->lua);
lua_pushstring((*request)->lua, "status");
lua_pushinteger((*request)->lua, 400); // TODO: How about a function that generates error responses?
lua_rawset((*request)->lua, -3);
}
else // TODO: 0 may mean EAGAIN, stuff will be bad very soon from here.
{
// 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);
}
int result = response_send((*request)->lua, (*request)->fd);
close((*request)->fd);
if (NULL != *request)
{
free_request(L, *request);
*request = NULL;
}
return result;
}
/// Accepts awaiting connections if any.
/// \param L Server's Lua state
/// \param efd File descriptor for epoll's context
/// \param server File descriptor for server socket
/// \return -1 if an error occured
int handle_server(lua_State * L, const int efd, const int server)
{
struct epoll_event e;
e.events = EPOLLIN; // TODO: Add EPOLLOUT?
const int client = accept(server, NULL, NULL);
if (-1 == client)
{
return -1; // TODO: Consider not crashing entire server because of one accept.
}
// TODO: Request is not the enitre state of the client. Make them distinct along with responses.
struct request * request = new_request(L);
if (NULL == request)
{
return -1;
}
request->fd = client;
e.data.ptr = request;
if (-1 == epoll_ctl(efd, EPOLL_CTL_ADD, client, &e))
{
return -1;
}
return 0;
}
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