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 static int luaevent_base_gc(lua_State* L) {
  33         le_base *base = event_base_get(L, 1);
  34         if(base->base) {
  35                 event_base_free(base->base);
  36                 base->base = NULL;
  37         }
  38         return 0;
  39 }
  40
  41 int getSocketFd(lua_State* L, int idx) {
  42         int fd;
  43         luaL_checktype(L, idx, LUA_TUSERDATA);
  44         lua_getfield(L, idx, "getfd");
  45         if(lua_isnil(L, -1))
  46                 return luaL_error(L, "Socket type missing 'getfd' method");
  47         lua_pushvalue(L, idx);
  48         lua_call(L, 1, 1);
  49         fd = lua_tointeger(L, -1);
  50         lua_pop(L, 1);
  51         return fd;
  52 }
  53
  54 void load_timeval(double time, struct timeval *tv) {
  55         tv->tv_sec = (int)time;
  56         tv->tv_usec = (int)(time * 1000000) % 1000000;
  57 }
  58
  59 /* sock, event, callback, timeout */
  60 static int luaevent_addevent(lua_State* L) {
  61         int fd, event;
  62         le_callback* arg = event_callback_push(L, 1, 4);
  63         struct timeval *tv = &arg->timeout;
  64         if(lua_isnil(L, 2) && lua_isnumber(L, 5)) {
  65                 fd = -1; /* Per event_timer_set.... */
  66         } else {
  67                 fd = getSocketFd(L, 2);
  68         }
  69         event = luaL_checkinteger(L, 3);
  70         if(lua_isnumber(L, 5)) {
  71                 double time = lua_tonumber(L, 5);
  72                 load_timeval(time, tv);
  73         } else {
  74                 tv = NULL;
  75         }
  76
  77         /* Setup event... */
  78         event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg);
  79         event_base_set(arg->base->base, &arg->ev);
  80         event_add(&arg->ev, tv);
  81         return 1;
  82 }
  83
  84 static int luaevent_loop(lua_State* L) {
  85         le_base *base = event_base_get(L, 1);
  86         base->loop_L = L;
  87         int ret = event_base_loop(base->base, 0);
  88         lua_pushinteger(L, ret);
  89         return 1;
  90 }
  91
  92 static luaL_Reg base_funcs[] = {
  93         { "addevent", luaevent_addevent },
  94         { "loop", luaevent_loop },
  95         { NULL, NULL }
  96 };
  97
  98 static luaL_Reg funcs[] = {
  99         { "new", luaevent_newbase },
 100         { NULL, NULL }
 101 };
 102
 103 typedef struct {
 104         const char* name;
 105         int value;
 106 } namedInteger;
 107
 108 static namedInteger consts[] = {
 109         {"LEAVE", -1},
 110         {"EV_READ", EV_READ},
 111         {"EV_WRITE", EV_WRITE},
 112         {"EV_TIMEOUT", EV_TIMEOUT},
 113         {"EV_SIGNAL", EV_SIGNAL},
 114         {"EV_PERSIST", EV_PERSIST},
 115         /* bufferevent */
 116         {"EVBUFFER_READ", EVBUFFER_READ},
 117         {"EVBUFFER_WRITE", EVBUFFER_WRITE},
 118         {"EVBUFFER_EOF", EVBUFFER_EOF},
 119         {"EVBUFFER_ERROR", EVBUFFER_ERROR},
 120         {"EVBUFFER_TIMEOUT", EVBUFFER_TIMEOUT},
 121         {NULL, 0}
 122 };
 123
 124 void setNamedIntegers(lua_State* L, namedInteger* p) {
 125         while(p->name) {
 126                 lua_pushinteger(L, p->value);
 127                 lua_setfield(L, -2, p->name);
 128                 p++;
 129         }
 130 }
 131
 132 /* Verified ok */
 133 int luaopen_luaevent_core(lua_State* L) {
 134 #ifdef _WIN32
 135         WORD wVersionRequested = MAKEWORD(2, 2);
 136         WSADATA wsaData;
 137         WSAStartup(wVersionRequested, &wsaData);
 138 #endif
 139         event_init( );
 140         /* Register external items */
 141         event_callback_register(L);
 142         event_buffer_register(L);
 143         buffer_event_register(L);
 144         lua_settop(L, 0);
 145         /* Setup metatable */
 146         luaL_newmetatable(L, EVENT_BASE_MT);
 147         lua_newtable(L);
 148         luaL_register(L, NULL, base_funcs);
 149         lua_setfield(L, -2, "__index");
 150         lua_pushcfunction(L, luaevent_base_gc);
 151         lua_setfield(L, -2, "__gc");
 152         lua_pop(L, 1);
 153
 154         luaL_register(L, "luaevent.core", funcs);
 155         setNamedIntegers(L, consts);
 156         return 1;
 157 }
 158