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