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