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pllua_pgfunc.c
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pllua_pgfunc.c
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#include "pllua_pgfunc.h"
#include "plluacommon.h"
#include "pllua.h"
#include "pllua_xact_cleanup.h"
#include <catalog/pg_language.h>
#include <lib/stringinfo.h>
static const char pg_func_type_name[] = "pg_func";
static Oid find_lang_oids(const char* lang){
HeapTuple tuple;
tuple = SearchSysCache(LANGNAME, CStringGetDatum(lang), 0, 0, 0);
if (HeapTupleIsValid(tuple))
{
Oid langtupoid = HeapTupleGetOid(tuple);
ReleaseSysCache(tuple);
return langtupoid;
}
return 0;
}
static Oid pllua_oid = 0;
static Oid plluau_oid = 0;
static Oid get_pllua_oid(){
if (pllua_oid !=0)
return pllua_oid;
return find_lang_oids("pllua");
}
static Oid get_plluau_oid(){
if (plluau_oid !=0)
return plluau_oid;
return find_lang_oids("plluau");
}
typedef struct{
Oid funcid;
int numargs;
Oid *argtypes;
char **argnames;
char *argmodes;
lua_CFunction callfunc;
Oid prorettype;
} PgFuncInfo, Lua_pgfunc;
#define freeandnil(p) do{ if (p){\
pfree(p);\
p = NULL;\
}}while(0)
static void clean_pgfuncinfo(Lua_pgfunc *data){
freeandnil (data->argtypes);
freeandnil (data->argnames);
freeandnil (data->argmodes);
}
static int call_0(lua_State *L){
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
luaP_pushdatum(L, OidFunctionCall0(fi->funcid), fi->prorettype);
return 1;
}
#define g_datum(v) luaP_todatum(L, fi->argtypes[v], 0, &isnull, v+1)
static int call_1(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall1(fi->funcid,
g_datum(0)), fi->prorettype);
return 1;
}
static int call_2(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall2(fi->funcid,
g_datum(0),
g_datum(1)), fi->prorettype);
return 1;
}
static int call_3(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall3(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2)), fi->prorettype);
return 1;
}
static int call_4(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall4(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3)), fi->prorettype);
return 1;
}
static int call_5(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall5(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3),
g_datum(4)), fi->prorettype);
return 1;
}
static int call_6(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall6(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3),
g_datum(4),
g_datum(5)), fi->prorettype);
return 1;
}
static int call_7(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall7(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3),
g_datum(4),
g_datum(5),
g_datum(6)), fi->prorettype);
return 1;
}
static int call_8(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall8(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3),
g_datum(4),
g_datum(5),
g_datum(6),
g_datum(7)), fi->prorettype);
return 1;
}
static int call_9(lua_State *L)
{
Lua_pgfunc *fi = (Lua_pgfunc *) lua_touserdata(L, lua_upvalueindex(1));
bool isnull;
luaP_pushdatum(L, OidFunctionCall9(fi->funcid,
g_datum(0),
g_datum(1),
g_datum(2),
g_datum(3),
g_datum(4),
g_datum(5),
g_datum(6),
g_datum(7),
g_datum(8)), fi->prorettype);
return 1;
}
#undef g_datum
static lua_CFunction pg_callable_funcs[] =
{
call_0,
call_1,
call_2,
call_3,
call_4,
call_5,
call_6,
call_7,
call_8,
call_9,
NULL
};
#define luaP_getfield(L, s) \
lua_pushlightuserdata((L), (void *)(s)); \
lua_rawget((L), LUA_REGISTRYINDEX)
int get_pgfunc(lua_State *L)
{
Lua_pgfunc *lf;
MemoryContext mcxt;
MemoryContext m;
const char* reg_name;
HeapTuple proctup;
Form_pg_proc proc;
const char* reg_error = NULL;
int i;
int luasrc = 0;
Oid funcid = 0;
BEGINLUA;
if (lua_gettop(L) != 1){
return luaL_error(L, "pgfunc(text): wrong arguments");
}
if(lua_type(L, 1) == LUA_TSTRING){
reg_name = luaL_checkstring(L, 1);
PG_TRY();
{
funcid = DatumGetObjectId(DirectFunctionCall1(regprocedurein, CStringGetDatum(reg_name)));
}
PG_CATCH();{}
PG_END_TRY();
}else if (lua_type(L, 1) == LUA_TNUMBER){
funcid = luaL_checkinteger(L, 1);
}
if (!OidIsValid(funcid)){
return luaL_error(L,"failed to register %s", reg_name);
}
proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(proctup)){
return luaL_error(L,"cache lookup failed for function %d", funcid);
}
proc = (Form_pg_proc) GETSTRUCT(proctup);
luasrc = ((proc->prolang == get_pllua_oid())
|| (proc->prolang == get_plluau_oid()));
if ( (proc->prolang != INTERNALlanguageId)
&&(proc->prolang != SQLlanguageId)
&&(proc->prolang != ClanguageId)
&&(!luasrc) ){
ReleaseSysCache(proctup);
return luaL_error(L, "supported only SQL/internal functions");
}
lf = (Lua_pgfunc *)lua_newuserdata(L, sizeof(Lua_pgfunc));
//make it g/collected
luaP_getfield(L, pg_func_type_name);
lua_setmetatable(L, -2);
lf->prorettype = proc->prorettype;
lf->funcid = funcid;
mcxt = get_common_ctx();
m = MemoryContextSwitchTo(mcxt);
lf->numargs = get_func_arg_info(proctup,
&lf->argtypes, &lf->argnames, &lf->argmodes);
m = MemoryContextSwitchTo(m);
if (luasrc){
bool isnull;
text *t;
const char *s;
luaL_Buffer b;
int pcall_result;
Datum prosrc;
if((lf->numargs != 1)
|| (lf->argtypes[0] != INTERNALOID)
|| (lf->prorettype != INTERNALOID)){
luaL_error(L, "pgfunc accepts only 'internal' pllua/u functions with internal argument");
}
prosrc = SysCacheGetAttr(PROCOID, proctup, Anum_pg_proc_prosrc, &isnull);
if (isnull) elog(ERROR, "[pgfunc]: null lua prosrc");
luaL_buffinit(L, &b);
luaL_addstring(&b,"do ");
t = DatumGetTextP(prosrc);
luaL_addlstring(&b, VARDATA(t), VARSIZE(t) - VARHDRSZ);
luaL_addstring(&b, " end");
luaL_pushresult(&b);
s = lua_tostring(L, -1);
ReleaseSysCache(proctup);
clean_pgfuncinfo(lf);
if (luaL_loadbuffer(L, s, strlen(s), "pgfunc chunk"))
luaL_error(L, "compile");
lua_remove(L, -2); /*delete source element*/
pcall_result = lua_pcall(L, 0, 1, 0);
lua_remove(L, -2); /*delete chunk*/
if(pcall_result == 0){
ENDLUAV(1);
return 1;
}
if( pcall_result == LUA_ERRRUN)
luaL_error(L,"%s %s","Runtime error:",lua_tostring(L, -1));
else if(pcall_result == LUA_ERRMEM)
luaL_error(L,"%s %s","Memory error:",lua_tostring(L, -1));
else if(pcall_result == LUA_ERRERR)
luaL_error(L,"%s %s","Error:",lua_tostring(L, -1));
return luaL_error(L, "pgfunc unknown error");
}
if (lf->numargs >9){
reg_error = "not supported function with more than 9 arguments";
}else {
for (i = 0; i < lf->numargs; i++){
char argmode = lf->argmodes ? lf->argmodes[i] : PROARGMODE_IN;
if (argmode != PROARGMODE_IN){
reg_error = "only input parameters supported";
break;
}
}
}
if (reg_error){
ReleaseSysCache(proctup);
clean_pgfuncinfo(lf);
return luaL_error(L, "pgfunc error: %s",reg_error);
}
lua_pushcclosure(L, pg_callable_funcs[lf->numargs], 1);
ReleaseSysCache(proctup);
ENDLUAV(1);
return 1;
}
static void __newmetatable (lua_State *L, const char *tname)
{
lua_newtable(L);
lua_pushlightuserdata(L, (void *) tname);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX);
}
static int gc_pg_func(lua_State *L)
{
Lua_pgfunc *lf = lua_touserdata(L, 1);
clean_pgfuncinfo(lf);
return 0;
}
static luaL_Reg regs[] =
{
{"__gc", gc_pg_func},
{ NULL, NULL }
};
void register_funcinfo_mt(lua_State *L)
{
__newmetatable(L, pg_func_type_name);
luaP_register(L, regs);
lua_pop(L, 1);
}