src/luaevent.c

   1 /* LuaEvent - Copyright (C) 2007 Thomas Harning <harningt@gmail.com>
   2  * Licensed as LGPL - See doc/COPYING for details */
   3
   4 #include "luaevent.h"
   5 #include "event_callback.h"
   6 #include "event_buffer.h"
   7
   8 #include <lua.h>
   9 #include <lauxlib.h>
  10 #include <assert.h>
  11
  12 #define EVENT_BASE_MT "EVENT_BASE_MT"
  13
  14 #ifdef _WIN32
  15 #include <winsock2.h>
  16 #endif
  17
  18 le_base* event_base_get(lua_State* L, int idx) {
  19         return (le_base*)luaL_checkudata(L, idx, EVENT_BASE_MT);
  20 }
  21
  22 int luaevent_newbase(lua_State* L) {
  23         le_base *base = (le_base*)lua_newuserdata(L, sizeof(le_base));
  24         base->loop_L = NULL; /* No running loop */
  25         base->base = event_init();
  26         luaL_getmetatable(L, EVENT_BASE_MT);
  27         lua_setmetatable(L, -2);
  28         return 1;
  29 }
  30
  31 static int luaevent_base_gc(lua_State* L) {
  32         le_base *base = event_base_get(L, 1);
  33         if(base->base) {
  34                 event_base_free(base->base);
  35                 base->base = NULL;
  36         }
  37         return 0;
  38 }
  39
  40 int getSocketFd(lua_State* L, int idx) {
  41         int fd;
  42         luaL_checktype(L, idx, LUA_TUSERDATA);
  43         lua_getfield(L, idx, "getfd");
  44         if(lua_isnil(L, -1))
  45                 return luaL_error(L, "Socket type missing 'getfd' method");
  46         lua_pushvalue(L, idx);
  47         lua_call(L, 1, 1);
  48         fd = lua_tointeger(L, -1);
  49         lua_pop(L, 1);
  50         return fd;
  51 }
  52
  53 void load_timeval(double time, struct timeval *tv) {
  54         tv->tv_sec = (int)time;
  55         tv->tv_usec = (int)(time * 1000000) % 1000000;
  56 }
  57
  58 /* sock, event, callback, timeout */
  59 static int luaevent_addevent(lua_State* L) {
  60         int fd, event;
  61         le_callback* arg = event_callback_push(L, 1, 4);
  62         struct timeval *tv = &arg->timeout;
  63         if(lua_isnil(L, 2) && lua_isnumber(L, 5)) {
  64                 fd = -1; /* Per event_timer_set.... */
  65         } else {
  66                 fd = getSocketFd(L, 2);
  67         }
  68         event = luaL_checkinteger(L, 3);
  69         if(lua_isnumber(L, 5)) {
  70                 double time = lua_tonumber(L, 5);
  71                 load_timeval(time, tv);
  72         } else {
  73                 tv = NULL;
  74         }
  75
  76         /* Setup event... */
  77         event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg);
  78         event_base_set(arg->base->base, &arg->ev);
  79         event_add(&arg->ev, tv);
  80         return 1;
  81 }
  82
  83 static int luaevent_loop(lua_State* L) {
  84         le_base *base = event_base_get(L, 1);
  85         base->loop_L = L;
  86         int ret = event_base_loop(base->base, 0);
  87         lua_pushinteger(L, ret);
  88         return 1;
  89 }
  90
  91 static luaL_Reg base_funcs[] = {
  92         { "addevent", luaevent_addevent },
  93         { "loop", luaevent_loop },
  94         { NULL, NULL }
  95 };
  96
  97 static luaL_Reg funcs[] = {
  98         { "new", luaevent_newbase },
  99         { NULL, NULL }
 100 };
 101
 102 typedef struct {
 103         const char* name;
 104         int value;
 105 } namedInteger;
 106
 107 static namedInteger consts[] = {
 108         {"LEAVE", -1},
 109         {"EV_READ", EV_READ},
 110         {"EV_WRITE", EV_WRITE},
 111         {"EV_TIMEOUT", EV_TIMEOUT},
 112         {NULL, 0}
 113 };
 114
 115 void setNamedIntegers(lua_State* L, namedInteger* p) {
 116         while(p->name) {
 117                 lua_pushinteger(L, p->value);
 118                 lua_setfield(L, -2, p->name);
 119                 p++;
 120         }
 121 }
 122
 123 /* Verified ok */
 124 int luaopen_luaevent_core(lua_State* L) {
 125 #ifdef _WIN32
 126         WORD wVersionRequested = MAKEWORD(2, 2);
 127         WSADATA wsaData;
 128         WSAStartup(wVersionRequested, &wsaData);
 129 #endif
 130         event_init( );
 131         /* Register external items */
 132         event_callback_register(L);
 133         event_buffer_register(L);
 134         /* Setup metatable */
 135         luaL_newmetatable(L, EVENT_BASE_MT);
 136         lua_newtable(L);
 137         luaL_register(L, NULL, base_funcs);
 138         lua_setfield(L, -2, "__index");
 139         lua_pushcfunction(L, luaevent_base_gc);
 140         lua_setfield(L, -2, "__gc");
 141         lua_pop(L, 1);
 142
 143         luaL_register(L, "luaevent.core", funcs);
 144         setNamedIntegers(L, consts);
 145         return 1;
 146 }
 147