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plluaapi.c
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plluaapi.c
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/*
* plluaapi.c: PL/Lua API
* Author: Luis Carvalho <lexcarvalho at gmail.com>
* Please check copyright notice at the bottom of pllua.h
*/
#include "pllua.h"
#include "rowstamp.h"
#include "lua_int64.h"
#include "rtupdescstk.h"
#include "pllua_pgfunc.h"
#include "pllua_subxact.h"
#include "pllua_errors.h"
/*
* [[ Uses of REGISTRY ]]
* [general]
* REG[light(L)] = memcontext
* [type]
* REG[oid(type)] = typeinfo
* REG[PLLUA_TYPEINFO] = typeinfo_MT
* REG[PLLUA_DATUM] = datum_MT
* [trigger]
* REG[rel_id] = desc_table
* REG[relname] = rel_table
* [call handler]
* REG[light(info)] = func
* REG[oid(func)] = info
* REG[light(thread)] = thread
*/
/* extended function info */
typedef struct luaP_Info {
RTupDescStack funcxt_wp; /* weak if init_weak used */
bool code_storage;
int oid;
int vararg;
Oid result;
bool result_isset;
struct RowStamp stamp; /* detect pg_proc row changes */
lua_State *L; /* thread for SETOF iterator */
Oid arg[1];
} luaP_Info;
/* extended type info */
typedef struct luaP_Typeinfo {
int oid;
int16 len;
char type;
char align;
bool byval;
Oid elem;
FmgrInfo input;
FmgrInfo output;
TupleDesc tupdesc;
} luaP_Typeinfo;
/* raw datum */
typedef struct luaP_Datum {
int issaved;
Datum datum;
luaP_Typeinfo *ti;
} luaP_Datum;
static const char PLLUA_TYPEINFO[] = "typeinfo";
static const char PLLUA_DATUM[] = "datum";
#define PLLUA_LOCALVAR "_U"
#define PLLUA_SHAREDVAR "shared"
#define PLLUA_SPIVAR "server"
#define PLLUA_TRIGGERVAR "trigger"
#define PLLUA_CHUNKNAME "pllua chunk"
#define PLLUA_INIT_EXIST \
"select 1 from pg_catalog.pg_tables where schemaname='pllua'" \
"and tablename='init'"
#define PLLUA_INIT_LIST "select module from pllua.init"
#define MaxArraySize ((Size) (MaxAllocSize / sizeof(Datum)))
/* back compatibility to 8.2 */
#if PG_VERSION_NUM < 80300
#define SET_VARSIZE(ptr, len) VARATT_SIZEP(ptr) = len
#define att_addlength_pointer(len, typ, ptr) \
att_addlength(len, typ, PointerGetDatum(ptr))
#define att_align_nominal(len, typ) att_align(len, typ)
#endif
#define info(msg) ereport(INFO, (errmsg("%s", msg)))
#define argerror(type) \
elog(ERROR, "[pllua]: type '%s' (%d) not supported as argument", \
format_type_be(type), (type))
#define resulterror(type) \
elog(ERROR, "[pllua]: type '%s' (%d) not supported as result", \
format_type_be(type), (type))
#define datum2string(d, f) \
DatumGetCString(DirectFunctionCall1((f), (d)))
#define text2string(d) datum2string((d), textout)
static int luaP_panic(lua_State *L){
(void)L;
ereport(FATAL, (errmsg("pllua unhandled exception")));
return 0;
}
/* string2text is simpler, so we implement it here with allocation in upper
* memory context */
static Datum string2text (const char *str) {
int l = strlen(str);
text *dat = (text *) SPI_palloc(l + VARHDRSZ); /* in upper context */
SET_VARSIZE(dat, l + VARHDRSZ);
memcpy(VARDATA(dat), str, l);
return PointerGetDatum(dat);
}
/* copy dat to upper memory context */
static Datum datumcopy (Datum dat, luaP_Typeinfo *ti) {
if (!ti->byval) { /* by reference? */
Size l = datumGetSize(dat, false, ti->len);
void *copy = SPI_palloc(l);
memcpy(copy, DatumGetPointer(dat), l);
return PointerGetDatum(copy);
}
return dat;
}
/* ======= Type ======= */
static int luaP_typeinfogc (lua_State *L) {
luaP_Typeinfo *ti = lua_touserdata(L, 1);
if (ti->tupdesc) FreeTupleDesc(ti->tupdesc);
return 0;
}
static luaP_Typeinfo *luaP_gettypeinfo (lua_State *L, int oid) {
luaP_Typeinfo *ti;
lua_push_oidstring(L, oid);
lua_rawget(L, LUA_REGISTRYINDEX);
if (lua_isnil(L, -1)) { /* not cached? */
HeapTuple type;
Form_pg_type typeinfo;
MemoryContext mcxt = luaP_getmemctxt(L);
/* query system */
type = SearchSysCache(TYPEOID, ObjectIdGetDatum(oid), 0, 0, 0);
if (!HeapTupleIsValid(type))
elog(ERROR, "[pllua]: cache lookup failed for type %u", oid);
typeinfo = (Form_pg_type) GETSTRUCT(type);
/* cache */
ti = lua_newuserdata(L, sizeof(luaP_Typeinfo));
ti->len = typeinfo->typlen;
ti->type = typeinfo->typtype;
ti->align = typeinfo->typalign;
ti->byval = typeinfo->typbyval;
ti->elem = typeinfo->typelem;
fmgr_info_cxt(typeinfo->typinput, &ti->input, mcxt);
fmgr_info_cxt(typeinfo->typoutput, &ti->output, mcxt);
ti->tupdesc = NULL;
if (ti->type == TYPTYPE_COMPOSITE) {
TupleDesc td = lookup_rowtype_tupdesc(oid, typeinfo->typtypmod);
MemoryContext m = MemoryContextSwitchTo(mcxt);
ti->tupdesc = CreateTupleDescCopyConstr(td);
MemoryContextSwitchTo(m);
BlessTupleDesc(ti->tupdesc);
ReleaseTupleDesc(td);
}
ReleaseSysCache(type);
lua_pushlightuserdata(L, (void *) PLLUA_TYPEINFO);
lua_rawget(L, LUA_REGISTRYINDEX); /* Typeinfo_MT */
lua_setmetatable(L, -2);
lua_push_oidstring(L, oid);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX); /* REG[oid] = typeinfo */
lua_pop(L, 2); /* nil and typeinfo */
}
else {
ti = lua_touserdata(L, -1);
lua_pop(L, 1);
}
return ti;
}
/* ======= Datum ======= */
static int luaP_datumtostring (lua_State *L) {
luaP_Datum *d = lua_touserdata(L, 1);
lua_pushstring(L, OutputFunctionCall(&d->ti->output, d->datum));
return 1;
}
static int luaP_datumgc (lua_State *L) {
luaP_Datum *d = lua_touserdata(L, 1);
if (d->issaved) pfree(DatumGetPointer(d->datum));
return 0;
}
static int luaP_datumsave (lua_State *L) {
luaP_Datum *d = luaP_toudata(L, 1, PLLUA_DATUM);
if (d == NULL) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
PLLUA_DATUM, luaL_typename(L, 1));
luaL_argerror(L, 1, msg);
}
if (!d->ti->byval) { /* by reference? */
Size l = datumGetSize(d->datum, false, d->ti->len);
MemoryContext mcxt = luaP_getmemctxt(L);
MemoryContext m = MemoryContextSwitchTo(mcxt);
Pointer copy = palloc(l);
Pointer dp = DatumGetPointer(d->datum);
memcpy(copy, dp, l);
MemoryContextSwitchTo(m);
pfree(dp);
d->issaved = 1;
d->datum = PointerGetDatum(copy);
}
return 1;
}
static luaP_Datum *luaP_pushrawdatum (lua_State *L, Datum dat,
luaP_Typeinfo *ti) {
luaP_Datum *d = lua_newuserdata(L, sizeof(luaP_Datum));
d->issaved = 0;
d->datum = dat;
d->ti = ti;
lua_pushlightuserdata(L, (void *) PLLUA_DATUM);
lua_rawget(L, LUA_REGISTRYINDEX); /* Datum_MT */
lua_setmetatable(L, -2);
return d;
}
/* ======= Trigger ======= */
static void luaP_preptrigger (lua_State *L, TriggerData *tdata) {
const char *relname;
char *namespace;
lua_pushglobaltable(L);
lua_pushstring(L, PLLUA_TRIGGERVAR);
lua_newtable(L);
/* when */
if (TRIGGER_FIRED_BEFORE(tdata->tg_event))
lua_pushstring(L, "before");
else if (TRIGGER_FIRED_AFTER(tdata->tg_event))
lua_pushstring(L, "after");
else
elog(ERROR, "[pllua]: unknown trigger 'when' event");
lua_setfield(L, -2, "when");
/* level */
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
lua_pushstring(L, "row");
else if (TRIGGER_FIRED_FOR_STATEMENT(tdata->tg_event))
lua_pushstring(L, "statement");
else
elog(ERROR, "[pllua]: unknown trigger 'level' event");
lua_setfield(L, -2, "level");
/* operation */
if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event))
lua_pushstring(L, "insert");
else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event))
lua_pushstring(L, "update");
else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event))
lua_pushstring(L, "delete");
#if PG_VERSION_NUM >= 80400
else if (TRIGGER_FIRED_BY_TRUNCATE(tdata->tg_event))
lua_pushstring(L, "truncate");
#endif
else
elog(ERROR, "[pllua]: unknown trigger 'operation' event");
lua_setfield(L, -2, "operation");
/* relation */
relname = NameStr(tdata->tg_relation->rd_rel->relname);
namespace = get_namespace_name(tdata->tg_relation->rd_rel->relnamespace);
lua_createtable(L, 0, 3);
lua_pushstring(L, relname);
lua_setfield(L, -2, "name");
luaP_pushdesctable(L, tdata->tg_relation->rd_att);
lua_push_oidstring(L, (int) tdata->tg_relation->rd_id);
lua_pushvalue(L, -2); /* attribute table */
lua_rawset(L, LUA_REGISTRYINDEX); /* cache desc */
lua_setfield(L, -2, "attributes");
lua_pushinteger(L, (int) tdata->tg_relation->rd_id);
lua_setfield(L, -2, "oid");
lua_pushstring(L, namespace);
lua_setfield(L, -2, "namespace");
lua_setfield(L, -2, "relation");
/* row */
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event)) {
if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event)) {
luaP_pushtuple_trg(L, tdata->tg_relation->rd_att, tdata->tg_newtuple,
tdata->tg_relation->rd_id, 0);
lua_setfield(L, -2, "row"); /* new row */
luaP_pushtuple_trg(L, tdata->tg_relation->rd_att, tdata->tg_trigtuple,
tdata->tg_relation->rd_id, 1);
lua_setfield(L, -2, "old"); /* old row */
}
else { /* insert or delete */
luaP_pushtuple_trg(L, tdata->tg_relation->rd_att, tdata->tg_trigtuple,
tdata->tg_relation->rd_id, 0);
lua_setfield(L, -2, "row"); /* old row */
}
}
/* trigger name */
lua_pushstring(L, tdata->tg_trigger->tgname);
lua_setfield(L, -2, "name");
/* done setting up trigger; now set global */
lua_rawset(L, -3); /* _G[PLLUA_TRIGGERVAR] = table */
lua_pop(L, 1); /* _G */
}
static Datum luaP_gettriggerresult (lua_State *L) {
HeapTuple tuple;
lua_getglobal(L, PLLUA_TRIGGERVAR);
lua_getfield(L, -1, "row");
tuple = luaP_totuple(L);
lua_pop(L, 2);
return PointerGetDatum(tuple);
}
static void luaP_cleantrigger (lua_State *L) {
rtds_tryclean(rtds_get_current()); //fi->functx;
lua_pushglobaltable(L);
lua_pushstring(L, PLLUA_TRIGGERVAR);
lua_pushnil(L);
lua_rawset(L, -3);
lua_pop(L, 1); /* _G */
}
/* ======= luaP_newstate: create a new Lua VM ======= */
static int luaP_modinit (lua_State *L) {
int status;
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "[pllua]: could not connect to SPI manager");
status = SPI_execute(PLLUA_INIT_EXIST, 1, 0);
if (status < 0)
lua_pushfstring(L, "[pllua]: error reading pllua.init: %d", status);
if (SPI_processed == 0) /* pllua.init does not exist? */
status = 0;
else {
status = SPI_execute(PLLUA_INIT_LIST, 1, 0);
if (status < 0)
lua_pushfstring(L, "[pllua]: error loading modules from pllua.init: %d",
status);
else {
status = 0;
if (SPI_processed > 0) { /* any rows? */
unsigned int i;
for (i = 0; i < SPI_processed; i++) {
bool isnull;
/* push module name */
lua_pushstring(L, text2string(heap_getattr(SPI_tuptable->vals[i],
1, SPI_tuptable->tupdesc, &isnull))); /* first column */
lua_getglobal(L, "require");
lua_pushvalue(L, -2); /* module name */
status = lua_pcall(L, 1, 1, 0);
if (status) break; /* error? */
if (!lua_isnil(L, -1)) { /* make sure global table is set? */
lua_pushglobaltable(L);
lua_pushvalue(L, -3); /* key */
lua_pushvalue(L, -3); /* value */
lua_rawset(L, -3); /* _G[key] = value */
lua_pop(L, 1); /* _G */
}
else
lua_pop(L, 1); /* module name */
}
}
}
}
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "[pllua]: could not disconnect from SPI manager");
return status;
}
static int luaP_globalnewindex (lua_State *L) {
return luaL_error(L, "attempt to set global var '%s'",
lua_tostring(L, -2));
}
static int luaP_setshared (lua_State *L) {
luaL_checkstring(L, 1);
if (lua_gettop(L) == 1) lua_pushboolean(L, 1);
lua_settop(L, 2); /* key, value */
lua_pushvalue(L, -1);
lua_insert(L, -3);
lua_pushglobaltable(L);
lua_insert(L, -3);
lua_rawset(L, -3);
lua_pop(L, 1); /* global table */
return 1;
}
static int luaP_print (lua_State *L) {
int i, n = lua_gettop(L); /* nargs */
const char *s;
luaL_Buffer b;
luaL_buffinit(L, &b);
lua_getglobal(L, "tostring");
for (i = 1; i <= n; i++) {
lua_pushvalue(L, -1); /* tostring */
lua_pushvalue(L, i); /* arg */
lua_call(L, 1, 1);
s = lua_tostring(L, -1);
if (s == NULL)
return luaL_error(L, "cannot convert to string");
if (i > 1) luaL_addchar(&b, '\t');
luaL_addlstring(&b, s, strlen(s));
lua_pop(L, 1);
}
luaL_pushresult(&b);
s = lua_tostring(L, -1);
info(s);
lua_pop(L, 1);
return 0;
}
#define PLLUA_REPORT(elevel) do{\
if (lua_type(L, 1)== LUA_TTABLE){\
luatable_report(L, elevel);\
return 0;\
}\
luaL_checkstring(L, 1);\
ereport(elevel, (errmsg("%s", lua_tostring(L, 1))));\
return 0;\
}while(0)
static int luaP_info (lua_State *L) {
PLLUA_REPORT(INFO);
}
static int luaP_log (lua_State *L) {
PLLUA_REPORT(LOG);
}
static int luaP_notice (lua_State *L) {
PLLUA_REPORT(NOTICE);
}
static int luaP_warning (lua_State *L) {
PLLUA_REPORT(WARNING);
}
#undef PLLUA_REPORT
static int luaP_fromstring (lua_State *L) {
const char *type_name = luaL_checkstring(L, 1);
Oid oid = pg_to_regtype(type_name);
if (oid == InvalidOid) {
return luaL_error(L,"type \"%s\" does not exist",type_name);
} else {
const char *s = luaL_checkstring(L, 2);
luaP_Typeinfo *ti = luaP_gettypeinfo(L, oid);
Oid inoid = oid;
Datum v;
/* from getTypeIOParam in lsyscache.c */
if (ti->type == TYPTYPE_BASE && OidIsValid(ti->elem)) inoid = ti->elem;
v = InputFunctionCall(&ti->input, (char *) s, inoid, 0); /* typmod = 0 */
luaP_pushdatum(L, v, oid);
}
return 1;
}
#ifdef PLLUA_DEBUG
static int
luaP_memstat(lua_State *L)
{
(void)L;
MemoryContextStats(TopMemoryContext);
return 0;
}
#endif
static const luaL_Reg luaP_funcs[] = {
{"assert", luaB_assert},
{"error", luaB_error},
{"fromstring", luaP_fromstring},
{"info", luaP_info},
{"log", luaP_log},
#ifdef PLLUA_DEBUG
{"memstat", luaP_memstat},
#endif
{"notice", luaP_notice},
{"pcall", subt_luaB_pcall},
{"pgfunc", get_pgfunc},
{"print", luaP_print},
{"setshared", luaP_setshared},
{"subtransaction", use_subtransaction},
{"warning", luaP_warning},
{"xpcall", subt_luaB_xpcall},
{NULL, NULL}
};
void luaP_close (lua_State *L) {
MemoryContext mcxt = luaP_getmemctxt(L);
MemoryContextDelete(mcxt);
lua_close(L);
}
lua_State *luaP_newstate (int trusted) {
int status;
MemoryContext mcxt = pg_create_context("PL/Lua context");
lua_State *L = luaL_newstate();
lua_atpanic(L, luaP_panic);
/* version */
lua_pushliteral(L, PLLUA_VERSION);
lua_setglobal(L, "_PLVERSION");
/* memory context */
lua_pushlightuserdata(L, p_lua_mem_cxt);
lua_pushlightuserdata(L, (void *) mcxt);
lua_rawset(L, LUA_REGISTRYINDEX);
lua_pushlightuserdata(L, p_lua_master_state);
lua_pushlightuserdata(L, (void *) L);
lua_rawset(L, LUA_REGISTRYINDEX);
/* core libs */
if (trusted) {
const luaL_Reg luaP_trusted_libs[] = {
#if LUA_VERSION_NUM <= 501
{"", luaopen_base},
#else
{"_G", luaopen_base},
{LUA_COLIBNAME, luaopen_coroutine},
#if LUA_VERSION_NUM < 503
{LUA_BITLIBNAME, luaopen_bit32},
#endif
#endif
{LUA_TABLIBNAME, luaopen_table},
{LUA_STRLIBNAME, luaopen_string},
{LUA_MATHLIBNAME, luaopen_math},
#ifdef LUA_JITLIBNAME
{LUA_JITLIBNAME, luaopen_jit},
#endif
{LUA_OSLIBNAME, luaopen_os}, /* restricted */
{LUA_LOADLIBNAME, luaopen_package}, /* just for pllua.init modules */
{NULL, NULL}
};
const char *os_funcs[] = {"date", "clock", "time", "difftime", NULL};
const luaL_Reg *reg = luaP_trusted_libs;
const char **s = os_funcs;
for (; reg->func; reg++) {
#if LUA_VERSION_NUM <= 501
lua_pushcfunction(L, reg->func);
lua_pushstring(L, reg->name);
lua_call(L, 1, 0);
#else
luaL_requiref(L, reg->name, reg->func, 1); /* set in global table */
lua_pop(L, 1); /* remove lib */
#endif
}
/* restricted os lib */
lua_getglobal(L, LUA_OSLIBNAME);
lua_newtable(L); /* new os */
for (; *s; s++) {
lua_getfield(L, -2, *s);
lua_setfield(L, -2, *s);
}
lua_setglobal(L, LUA_OSLIBNAME);
lua_pop(L, 1);
}
else
luaL_openlibs(L);
register_error_mt(L);
register_funcinfo_mt(L);
register_int64(L);
/* setup typeinfo and raw datum MTs */
lua_pushlightuserdata(L, (void *) PLLUA_TYPEINFO);
lua_newtable(L); /* luaP_Typeinfo MT */
lua_pushcfunction(L, luaP_typeinfogc);
lua_setfield(L, -2, "__gc");
lua_rawset(L, LUA_REGISTRYINDEX);
lua_pushlightuserdata(L, (void *) PLLUA_DATUM);
lua_newtable(L); /* luaP_Datum MT */
lua_pushcfunction(L, luaP_datumtostring);
lua_setfield(L, -2, "__tostring");
lua_pushcfunction(L, luaP_datumgc);
lua_setfield(L, -2, "__gc");
lua_createtable(L, 0, 1);
lua_pushcfunction(L, luaP_datumsave);
lua_setfield(L, -2, "save");
lua_setfield(L, -2, "__index");
lua_rawset(L, LUA_REGISTRYINDEX);
/* load pllua.init modules */
status = luaP_modinit(L);
if (status != 0) /* SPI or module loading error? */
elog(ERROR, "%s", lua_tostring(L, -1));
/* set alias for _G */
lua_pushglobaltable(L);
lua_setglobal(L, PLLUA_SHAREDVAR); /* _G.shared = _G */
/* globals */
lua_pushglobaltable(L);
luaP_register(L, luaP_funcs);
lua_pop(L, 1);
/* SPI */
luaP_registerspi(L);
lua_setglobal(L, PLLUA_SPIVAR);
if (trusted) {
const char *package_keys[] = { /* to be removed */
"preload", "loadlib", "loaders", "seeall", NULL};
const char *global_keys[] = { /* to be removed */
"require", "module", "dofile", "loadfile", "jit", NULL};
const char **s;
/* clean package module */
lua_getglobal(L, "package");
for (s = package_keys; *s; s++) {
lua_pushnil(L);
lua_setfield(L, -2, *s);
}
lua_pop(L, 1); /* package table */
/* clean global table */
for (s = global_keys; *s; s++) {
lua_pushnil(L);
lua_setglobal(L, *s);
}
/* set _G as read-only */
lua_pushglobaltable(L);
lua_createtable(L, 0, 1);
lua_pushcfunction(L, luaP_globalnewindex);
lua_setfield(L, -2, "__newindex");
lua_pushvalue(L, -1); /* metatable */
lua_setfield(L, -2, "__metatable");
lua_setmetatable(L, -2);
lua_pop(L, 1); /* _G */
}
return L;
}
/* ======= luaP_pushfunction ======= */
static luaP_Info *luaP_newinfo (lua_State *L, int nargs, int oid,
Form_pg_proc procst) {
Oid *argtype = procst->proargtypes.values;
Oid rettype = procst->prorettype;
bool isset = procst->proretset;
luaP_Info *fi;
int i;
luaP_Typeinfo *ti;
bool code_storage = ((nargs == 1)
&&(argtype[0] == INTERNALOID)
&&(rettype == INTERNALOID));
fi = lua_newuserdata(L, sizeof(luaP_Info) + nargs * sizeof(Oid));
fi->funcxt_wp = NULL;
fi->oid = oid;
fi->code_storage = code_storage;
if(!code_storage){
/* read arg types */
for (i = 0; i < nargs; i++) {
ti = luaP_gettypeinfo(L, argtype[i]);
if (ti->type == TYPTYPE_PSEUDO)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("[pllua]: functions cannot take type '%s'",
format_type_be(argtype[i]))));
fi->arg[i] = argtype[i];
}
/* read result type */
ti = luaP_gettypeinfo(L, rettype);
if (ti->type == TYPTYPE_PSEUDO && rettype != VOIDOID && rettype != TRIGGEROID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("[pllua]: functions cannot return type '%s'",
format_type_be(rettype))));
}else{
fi->arg[0] = INTERNALOID;
}
fi->vararg = rettype == TRIGGEROID; /* triggers are vararg */
fi->result = rettype;
fi->result_isset = isset;
fi->L = NULL;
return fi;
}
/* test argument and return types, compile function, store it at registry,
* and return info at the top of stack */
static void luaP_newfunction (lua_State *L, int oid, HeapTuple proc,
luaP_Info **fi) {
int nargs; /* fcinfo->nargs */
Form_pg_proc procst;
bool isnull;
Datum prosrc, *argname;
const char *source, *fname;
text *t;
luaL_Buffer b;
int init = (*fi == NULL); /* not initialized? */
const char *chunk_name = NULL;//PLLUA_CHUNKNAME;
/* read proc info */
procst = (Form_pg_proc) GETSTRUCT(proc);
prosrc = SysCacheGetAttr(PROCOID, proc, Anum_pg_proc_prosrc, &isnull);
if (isnull) elog(ERROR, "[pllua]: null prosrc");
nargs = procst->pronargs;
/* get info userdata */
if (init) {
lua_push_oidstring(L, oid);
*fi = luaP_newinfo(L, nargs, oid, procst);
}
lua_pushlightuserdata(L, (void *) *fi);
/* check #argnames */
if ((nargs > 0)&&((*fi)->code_storage == 0)) {
int nnames;
Datum argnames = SysCacheGetAttr(PROCOID, proc,
Anum_pg_proc_proargnames, &isnull);
if (!isnull)
deconstruct_array(DatumGetArrayTypeP(argnames), TEXTOID, -1, false,
'i', &argname, NULL, &nnames);
if (nnames != nargs)
(*fi)->vararg = 1;
else { /* check empty names */
int i;
for (i = 0; i < nnames && !(*fi)->vararg; i++) {
if (VARSIZE(DatumGetTextP(argname[i])) == VARHDRSZ) /* empty? */
(*fi)->vararg = 1;
}
}
}
/* prepare buffer */
luaL_buffinit(L, &b);
/* read func name */
fname = NameStr(procst->proname);
/* prepare header: "local upvalue,f f=function(" */
luaL_addlstring(&b, "local " PLLUA_LOCALVAR ",",
6 + sizeof(PLLUA_LOCALVAR));
luaL_addlstring(&b, fname, strlen(fname));
luaL_addchar(&b, ' ');
luaL_addlstring(&b, fname, strlen(fname));
luaL_addlstring(&b, "=function(", 10);
/* read arg names */
if((*fi)->code_storage == 0){
if ((*fi)->vararg) luaL_addlstring(&b, "...", 3);
else {
int i;
for (i = 0; i < nargs; i++) {
if (i > 0) luaL_addchar(&b, ',');
t = DatumGetTextP(argname[i]);
luaL_addlstring(&b, VARDATA(t), VARSIZE(t) - VARHDRSZ);
}
}
}
luaL_addlstring(&b, ") ", 2);
/* read source */
t = DatumGetTextP(prosrc);
luaL_addlstring(&b, VARDATA(t), VARSIZE(t) - VARHDRSZ);
/* prepare footer: " end return f" */
luaL_addlstring(&b, " end return ", 12);
luaL_addlstring(&b, fname, strlen(fname));
/* create function */
luaL_pushresult(&b);
source = lua_tostring(L, -1);
#if defined(PLLUA_DEBUG)
chunk_name = source;
#else
chunk_name = fname;
#endif
if (luaL_loadbuffer(L, source, strlen(source), chunk_name))
luapg_error(L, "compile");
lua_remove(L, -2); /* source */
if (lua_pcall(L, 0, 1, 0)) luapg_error(L, "call");
rowstamp_set(&(*fi)->stamp, proc); /* row-stamp info */
lua_pushvalue(L, -1); /* func */
if (init) {
lua_insert(L, -5);
lua_rawset(L, LUA_REGISTRYINDEX); /* REG[light_info] = func */
lua_rawset(L, LUA_REGISTRYINDEX); /* REG[oid] = info */
}
else {
lua_insert(L, -3);
lua_rawset(L, LUA_REGISTRYINDEX); /* REG[light_info] = func */
}
}
/* leaves function info (fi) for oid in stack */
static luaP_Info *luaP_pushfunction (lua_State *L, int oid) {
luaP_Info *fi = NULL;
HeapTuple proc;
proc = SearchSysCache(PROCOID, ObjectIdGetDatum((Oid) oid), 0, 0, 0);
if (!HeapTupleIsValid(proc))
elog(ERROR, "[pllua]: cache lookup failed for function %u", (Oid) oid);
lua_push_oidstring(L, oid);
lua_rawget(L, LUA_REGISTRYINDEX);
if (lua_isnil(L, -1)) { /* not interned? */
lua_pop(L, 1); /* nil */
luaP_newfunction(L, oid, proc, &fi);
}
else {
fi = lua_touserdata(L, -1);
lua_pop(L, 1); /* info udata */
lua_pushlightuserdata(L, (void *) fi);
if (rowstamp_check(&fi->stamp, proc)) /* not replaced? */
lua_rawget(L, LUA_REGISTRYINDEX);
else {
lua_pushnil(L);
lua_rawset(L, LUA_REGISTRYINDEX); /* REG[old_light_info] = nil */
luaP_newfunction(L, oid, proc, &fi);
}
}
ReleaseSysCache(proc);
return fi;
}
/* ======= luaP_pushargs ======= */
static void luaP_pusharray (lua_State *L, char **p, int ndims,
int *dims, int *lb, bits8 **bitmap, int *bitmask,
luaP_Typeinfo *ti, Oid typeelem) {
int i;
lua_newtable(L);
if (ndims == 1) { /* vector? */
for (i = 0; i < (*dims); i++) {
if (*bitmap == NULL || ((**bitmap) & (*bitmask)) != 0) { /* not NULL? */
luaP_pushdatum(L, fetch_att(*p, ti->byval, ti->len), typeelem);
lua_rawseti(L, -2, (*lb) + i);
*p = att_addlength_pointer(*p, ti->len, *p);
*p = (char *) att_align_nominal(*p, ti->align);
}
if (*bitmap) { /* advance bitmap pointer? */
*bitmask <<= 1;
if (*bitmask == 0x100) {
(*bitmap)++;
*bitmask = 1;
}
}
}
}
else { /* multidimensional array */
for (i = 0; i < (*dims); i++) {
luaP_pusharray(L, p, ndims - 1, dims + 1, lb + 1, bitmap, bitmask,
ti, typeelem);
lua_rawseti(L, -2, (*lb) + i);
}
}
}
void luaP_pushdatum (lua_State *L, Datum dat, Oid type) {
switch (type) {
/* base and domain types */
case BOOLOID:
lua_pushboolean(L, (int) (dat != 0));
break;
case FLOAT4OID:
lua_pushnumber(L, (lua_Number) DatumGetFloat4(dat));
break;
case FLOAT8OID:
lua_pushnumber(L, (lua_Number) DatumGetFloat8(dat));
break;
case INT2OID:
lua_pushinteger(L, (lua_Integer) DatumGetInt16(dat));
break;
case INT4OID:
lua_pushinteger(L, (lua_Integer) DatumGetInt32(dat));
break;
case INT8OID:
setInt64lua(L,(DatumGetInt64(dat)));
break;
case TEXTOID:
lua_pushstring(L, text2string(dat));
break;
case BPCHAROID:
lua_pushstring(L, datum2string(dat, bpcharout));
break;
case VARCHAROID:
lua_pushstring(L, datum2string(dat, varcharout));
break;
case REFCURSOROID: {
Portal cursor = SPI_cursor_find(text2string(dat));
if (cursor != NULL) luaP_pushcursor(L, cursor);
else lua_pushnil(L);
break;
}
case RECORDOID:
luaP_pushrecord(L, dat);
break;
default: {
luaP_Typeinfo *ti;
ti = luaP_gettypeinfo(L, type);
switch (ti->type) {
case TYPTYPE_COMPOSITE: {
HeapTupleHeader tup = DatumGetHeapTupleHeader(dat);
int i;
const char *key;
bool isnull;
Datum value;
lua_createtable(L, 0, ti->tupdesc->natts);
for (i = 0; i < ti->tupdesc->natts; i++) {
key = NameStr(TupleDescAttr(ti->tupdesc, i)->attname);
value = GetAttributeByNum(tup, TupleDescAttr(ti->tupdesc, i)->attnum, &isnull);
if (!isnull) {
luaP_pushdatum(L, value, TupleDescAttr(ti->tupdesc, i)->atttypid);
lua_setfield(L, -2, key);
}
}
break;
}
case TYPTYPE_PSEUDO:
if (type != VOIDOID) argerror(type);
break;
case TYPTYPE_BASE:
case TYPTYPE_DOMAIN:
if (ti->elem != 0 && ti->len == -1) { /* array? */
ArrayType *arr = DatumGetArrayTypeP(dat);
char *p = ARR_DATA_PTR(arr);
bits8 *bitmap = ARR_NULLBITMAP(arr);
int bitmask = 1;
luaP_Typeinfo *te = luaP_gettypeinfo(L, ti->elem);
luaP_pusharray(L, &p, ARR_NDIM(arr), ARR_DIMS(arr), ARR_LBOUND(arr),
&bitmap, &bitmask, te, ti->elem);
}
else
luaP_pushrawdatum(L, dat, ti);
break;
#if PG_VERSION_NUM >= 80300
case TYPTYPE_ENUM:
lua_pushinteger(L, (lua_Integer) DatumGetInt32(dat)); /* 4-byte long */
break;
#endif
default:
argerror(type);
}
}
}
}
static void luaP_pushargs (lua_State *L, FunctionCallInfo fcinfo,
luaP_Info *fi) {
int i;
for (i = 0; i < fcinfo->nargs; i++) {
if (fcinfo->argnull[i]) lua_pushnil(L);
else luaP_pushdatum(L, fcinfo->arg[i], fi->arg[i]);
}
}
/* ======= luaP_getresult ======= */
/* assume table is in top, returns size */
static int luaP_getarraydims (lua_State *L, int *ndims, int *dims,
int *lb, luaP_Typeinfo *ti, Oid typeelem, int typmod, bool *hasnulls) {
int size = 0;
int nitems = 0;
*ndims = -1;
*hasnulls = false;
lua_pushnil(L);
while (lua_next(L, -2)) {
if (lua_isnumber(L, -2)) {
int n;
int k = lua_tointeger(L, -2);
/* set dims and lb */
if (*ndims < 0) { /* first visit? */
*lb = k;
*dims = 1;
}
else {
if (*lb > k) {
*dims += *lb - k;
*lb = k;
}
if (*dims - 1 + *lb < k) /* max < k? */
*dims = k - *lb + 1;
}
/* set ndims */
if (lua_type(L, -1) == LUA_TTABLE) {
int d = -1, l = -1;
if (*ndims == MAXDIM)
elog(ERROR, "[pllua]: table exceeds max number of dimensions");
if (*ndims > 1) {
d = dims[1]; l = lb[1];
}
size += luaP_getarraydims(L, &n, dims + 1, lb + 1, ti, typeelem,
typmod, hasnulls);
if (*ndims > 1) { /* update dims and bounds? */
if (l < lb[1]) {
lb[1] = l;
*hasnulls = true;
}
if (d + l > dims[1] + lb[1]) {
dims[1] = d + l - lb[1];
*hasnulls = true;
}