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/*
* Lua module wrapping librados::bufferlist
*/
#include <errno.h>
#include <string>
#include <sstream>
#include <math.h>
#include <lua.hpp>
#include "include/types.h"
#include "include/buffer.h"
#include "objclass/objclass.h"
#include "cls/lua/cls_lua.h"
#define LUA_BUFFERLIST "ClsLua.Bufferlist"
struct bufferlist_wrap {
bufferlist *bl;
int gc; /* do garbage collect? */
};
static inline struct bufferlist_wrap *to_blwrap(lua_State *L, int pos = 1)
{
return (bufferlist_wrap *)luaL_checkudata(L, pos, LUA_BUFFERLIST);
}
bufferlist *clslua_checkbufferlist(lua_State *L, int pos)
{
struct bufferlist_wrap *blw = to_blwrap(L, pos);
return blw->bl;
}
/*
* Pushes a new bufferlist userdata object onto the stack. If @set is non-null
* it is assumed to be a bufferlist that should not be garbage collected.
*/
bufferlist *clslua_pushbufferlist(lua_State *L, bufferlist *set)
{
bufferlist_wrap *blw = static_cast<bufferlist_wrap *>(lua_newuserdata(L, sizeof(*blw)));
blw->bl = set ? set : new bufferlist();
blw->gc = set ? 0 : 1;
luaL_getmetatable(L, LUA_BUFFERLIST);
lua_setmetatable(L, -2);
return blw->bl;
}
/*
* Create a new bufferlist
*/
static int bl_new(lua_State *L)
{
clslua_pushbufferlist(L, NULL);
return 1;
}
/*
* Convert bufferlist to Lua string
*/
static int bl_str(lua_State *L)
{
bufferlist *bl = clslua_checkbufferlist(L);
lua_pushlstring(L, bl->c_str(), bl->length());
return 1;
}
/*
* Append a Lua string to bufferlist
*/
static int bl_append(lua_State *L)
{
bufferlist *bl = clslua_checkbufferlist(L);
luaL_checktype(L, 2, LUA_TSTRING);
size_t len;
const char *data = lua_tolstring(L, 2, &len);
bl->append(data, len);
return 0;
}
/*
* Return the length in bytes of bufferlist
*/
static int bl_len(lua_State *L)
{
bufferlist *bl = clslua_checkbufferlist(L);
lua_pushinteger(L, bl->length());
return 1;
}
/*
* Perform byte-for-byte bufferlist equality test
*/
static int bl_eq(lua_State *L)
{
bufferlist *bl1 = clslua_checkbufferlist(L, 1);
bufferlist *bl2 = clslua_checkbufferlist(L, 2);
lua_pushboolean(L, *bl1 == *bl2 ? 1 : 0);
return 1;
}
/*
* Bufferlist < operator
*/
static int bl_lt(lua_State *L)
{
bufferlist *bl1 = clslua_checkbufferlist(L, 1);
bufferlist *bl2 = clslua_checkbufferlist(L, 2);
lua_pushboolean(L, *bl1 < *bl2 ? 1 : 0);
return 1;
}
/*
* Bufferlist <= operator
*/
static int bl_le(lua_State *L)
{
bufferlist *bl1 = clslua_checkbufferlist(L, 1);
bufferlist *bl2 = clslua_checkbufferlist(L, 2);
lua_pushboolean(L, *bl1 <= *bl2 ? 1 : 0);
return 1;
}
/*
* Bufferlist concatentation
*/
static int bl_concat(lua_State *L)
{
bufferlist *bl1 = clslua_checkbufferlist(L, 1);
bufferlist *bl2 = clslua_checkbufferlist(L, 2);
bufferlist *ret = clslua_pushbufferlist(L, NULL);
ret->append(bl1->c_str(), bl1->length());
ret->append(bl2->c_str(), bl2->length());
return 1;
}
/*
* Garbage collect bufferlist
*/
static int bl_gc(lua_State *L)
{
struct bufferlist_wrap *blw = to_blwrap(L);
ceph_assert(blw);
ceph_assert(blw->bl);
if (blw->gc)
delete blw->bl;
return 0;
}
static const struct luaL_Reg bufferlist_methods[] = {
{"str", bl_str},
{"append", bl_append},
{"__concat", bl_concat},
{"__len", bl_len},
{"__lt", bl_lt},
{"__le", bl_le},
{"__gc", bl_gc},
{"__eq", bl_eq},
{NULL, NULL}
};
static const struct luaL_Reg bllib_f[] = {
{"new", bl_new},
{NULL, NULL}
};
int luaopen_bufferlist(lua_State *L)
{
/* Setup bufferlist user-data type */
luaL_newmetatable(L, LUA_BUFFERLIST);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
luaL_setfuncs(L, bufferlist_methods, 0);
lua_pop(L, 1);
lua_newtable(L);
luaL_setfuncs(L, bllib_f, 0);
return 1;
}
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