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 #include "buffer_event.h"
   8
   9 #include <lua.h>
  10 #include <lauxlib.h>
  11 #include <assert.h>
  12
  13 #define EVENT_BASE_MT "EVENT_BASE_MT"
  14
  15 #ifdef _WIN32
  16 #include <winsock2.h>
  17 #endif
  18
  19 le_base* event_base_get(lua_State* L, int idx) {
  20         return (le_base*)luaL_checkudata(L, idx, EVENT_BASE_MT);
  21 }
  22
  23 int luaevent_newbase(lua_State* L) {
  24         le_base *base = (le_base*)lua_newuserdata(L, sizeof(le_base));
  25         base->loop_L = NULL; /* No running loop */
  26         base->base = event_init();
  27         luaL_getmetatable(L, EVENT_BASE_MT);
  28         lua_setmetatable(L, -2);
  29         return 1;
  30 }
  31
  32 int luaevent_libevent_version(lua_State* L) {
  33         lua_pushstring(L, event_get_version());
  34         return 1;
  35 }
  36
  37 static int luaevent_base_gc(lua_State* L) {
  38         le_base *base = event_base_get(L, 1);
  39         if(base->base) {
  40                 event_base_free(base->base);
  41                 base->base = NULL;
  42         }
  43         return 0;
  44 }
  45
  46 int getSocketFd(lua_State* L, int idx) {
  47         int fd;
  48         if(lua_isnumber(L, idx)) {
  49                 fd = lua_tonumber(L, idx);
  50         } else {
  51                 luaL_checktype(L, idx, LUA_TUSERDATA);
  52                 lua_getfield(L, idx, "getfd");
  53                 if(lua_isnil(L, -1))
  54                         return luaL_error(L, "Socket type missing 'getfd' method");
  55                 lua_pushvalue(L, idx);
  56                 lua_call(L, 1, 1);
  57                 fd = lua_tointeger(L, -1);
  58                 lua_pop(L, 1);
  59         }
  60         return fd;
  61 }
  62
  63 void load_timeval(double time, struct timeval *tv) {
  64         tv->tv_sec = (int)time;
  65         tv->tv_usec = (int)(time * 1000000) % 1000000;
  66 }
  67
  68 /* sock, event, callback, timeout */
  69 static int luaevent_addevent(lua_State* L) {
  70         int fd, event;
  71         le_callback* arg = event_callback_push(L, 1, 4);
  72         struct timeval *tv = &arg->timeout;
  73         if(lua_isnil(L, 2) && lua_isnumber(L, 5)) {
  74                 fd = -1; /* Per event_timer_set.... */
  75         } else {
  76                 fd = getSocketFd(L, 2);
  77         }
  78         event = luaL_checkinteger(L, 3);
  79         if(lua_isnumber(L, 5)) {
  80                 double time = lua_tonumber(L, 5);
  81                 load_timeval(time, tv);
  82         } else {
  83                 tv = NULL;
  84         }
  85
  86         /* Setup event... */
  87         event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg);
  88         event_base_set(arg->base->base, &arg->ev);
  89         event_add(&arg->ev, tv);
  90         return 1;
  91 }
  92
  93 static int luaevent_loop(lua_State* L) {
  94         le_base *base = event_base_get(L, 1);
  95         base->loop_L = L;
  96         int ret = event_base_loop(base->base, 0);
  97         lua_pushinteger(L, ret);
  98         return 1;
  99 }
 100
 101 static int luaevent_loopexit(lua_State*L) {
 102         le_base *base = event_base_get(L, 1);
 103         struct timeval tv = { 0, 0 };
 104         if(lua_gettop(L) >= 2) /* Optional timeout before exiting the loop */
 105                 load_timeval(luaL_checknumber(L, 2), &tv);
 106         int ret = event_base_loopexit(base->base, &tv);
 107         lua_pushinteger(L, ret);
 108         return 1;
 109 }
 110
 111 static int luaevent_method(lua_State* L) {
 112         le_base *base = event_base_get(L, 1);
 113         lua_pushstring(L, event_base_get_method(base->base));
 114         return 1;
 115 }
 116
 117 static luaL_Reg base_funcs[] = {
 118         { "addevent", luaevent_addevent },
 119         { "loop", luaevent_loop },
 120         { "loopexit", luaevent_loopexit },
 121         { "method", luaevent_method },
 122         { NULL, NULL }
 123 };
 124
 125 static luaL_Reg funcs[] = {
 126         { "new", luaevent_newbase },
 127         { "libevent_version", luaevent_libevent_version },
 128         { NULL, NULL }
 129 };
 130
 131 typedef struct {
 132         const char* name;
 133         int value;
 134 } namedInteger;
 135
 136 static namedInteger consts[] = {
 137         {"LEAVE", -1},
 138         {"EV_READ", EV_READ},
 139         {"EV_WRITE", EV_WRITE},
 140         {"EV_TIMEOUT", EV_TIMEOUT},
 141         {"EV_SIGNAL", EV_SIGNAL},
 142         {"EV_PERSIST", EV_PERSIST},
 143         /* bufferevent */
 144         {"EVBUFFER_READ", EVBUFFER_READ},
 145         {"EVBUFFER_WRITE", EVBUFFER_WRITE},
 146         {"EVBUFFER_EOF", EVBUFFER_EOF},
 147         {"EVBUFFER_ERROR", EVBUFFER_ERROR},
 148         {"EVBUFFER_TIMEOUT", EVBUFFER_TIMEOUT},
 149         {NULL, 0}
 150 };
 151
 152 void setNamedIntegers(lua_State* L, namedInteger* p) {
 153         while(p->name) {
 154                 lua_pushinteger(L, p->value);
 155                 lua_setfield(L, -2, p->name);
 156                 p++;
 157         }
 158 }
 159
 160 /* Verified ok */
 161 int luaopen_luaevent_core(lua_State* L) {
 162 #ifdef _WIN32
 163         WORD wVersionRequested = MAKEWORD(2, 2);
 164         WSADATA wsaData;
 165         WSAStartup(wVersionRequested, &wsaData);
 166 #endif
 167         event_init( );
 168         /* Register external items */
 169         event_callback_register(L);
 170         event_buffer_register(L);
 171         buffer_event_register(L);
 172         lua_settop(L, 0);
 173         /* Setup metatable */
 174         luaL_newmetatable(L, EVENT_BASE_MT);
 175         lua_newtable(L);
 176         luaL_register(L, NULL, base_funcs);
 177         lua_setfield(L, -2, "__index");
 178         lua_pushcfunction(L, luaevent_base_gc);
 179         lua_setfield(L, -2, "__gc");
 180         lua_pop(L, 1);
 181
 182         luaL_register(L, "luaevent.core", funcs);
 183         setNamedIntegers(L, consts);
 184         return 1;
 185 }
 186