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Copy pathothers.c
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862 lines (704 loc) · 18 KB
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#include "postgres.h"
#include <stdlib.h>
#include <locale.h>
#if PG_VERSION_NUM < 160000
#include "access/genam.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/table.h"
#endif
#include "access/htup_details.h"
#include "catalog/indexing.h"
#include "catalog/pg_extension.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/extension.h"
#include "fmgr.h"
#include "lib/stringinfo.h"
#include "nodes/nodeFuncs.h"
#include "nodes/pg_list.h"
#include "nodes/primnodes.h"
#include "parser/parse_expr.h"
#include "parser/parse_oper.h"
#include "storage/lock.h"
#include "storage/proc.h"
#include "utils/array.h"
#include "utils/arrayaccess.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/datum.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#include "utils/uuid.h"
#include "orafce.h"
#include "builtins.h"
/*
* Source code for nlssort is taken from postgresql-nls-string
* package by Jan Pazdziora
*/
static char *lc_collate_cache = NULL;
static size_t multiplication = 1;
static text *def_locale = NULL;
char *orafce_sys_guid_source;
static Oid uuid_generate_func_oid = InvalidOid;
static FmgrInfo uuid_generate_func_finfo;
/* The oid of function should be valid in oene transaction */
static LocalTransactionId uuid_generate_func_lxid = InvalidLocalTransactionId;
static char uuid_generate_func_name[30] = "";
static Datum ora_greatest_least(FunctionCallInfo fcinfo, bool greater);
#if PG_VERSION_NUM >= 170000
#define CURRENT_LXID (MyProc->vxid.lxid)
#else
#define CURRENT_LXID (MyProc->lxid)
#endif
#if PG_VERSION_NUM < 160000
static Oid
get_extension_schema(Oid ext_oid)
{
Oid result;
Relation rel;
SysScanDesc scandesc;
HeapTuple tuple;
ScanKeyData entry[1];
rel = table_open(ExtensionRelationId, AccessShareLock);
ScanKeyInit(&entry[0],
Anum_pg_extension_oid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(ext_oid));
scandesc = systable_beginscan(rel, ExtensionOidIndexId, true,
NULL, 1, entry);
tuple = systable_getnext(scandesc);
/* We assume that there can be at most one matching tuple */
if (HeapTupleIsValid(tuple))
result = ((Form_pg_extension) GETSTRUCT(tuple))->extnamespace;
else
result = InvalidOid;
systable_endscan(scandesc);
table_close(rel, AccessShareLock);
return result;
}
#endif
static Oid
get_uuid_generate_func_oid(bool *reset_fmgr)
{
Oid result = InvalidOid;
if (uuid_generate_func_lxid != CURRENT_LXID ||
uuid_generate_func_oid == InvalidOid ||
strcmp(orafce_sys_guid_source, uuid_generate_func_name) != 0)
{
if (strcmp(orafce_sys_guid_source, "gen_random_uuid") == 0)
{
/*
* generated uuid can have not nice features, but uses buildin
* functionality
*/
result = fmgr_internal_function("gen_random_uuid");
}
else
{
Oid uuid_ossp_oid = InvalidOid;
Oid uuid_ossp_namespace_oid = InvalidOid;
CatCList *catlist;
int i;
uuid_ossp_oid = get_extension_oid("uuid-ossp", true);
if (!OidIsValid(uuid_ossp_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("extension \"uuid-ossp\" is not installed"),
errhint("the extension \"uuid-ossp\" should be installed before using \"sys_guid\" function")));
uuid_ossp_namespace_oid = get_extension_schema(uuid_ossp_oid);
Assert(OidIsValid(uuid_ossp_namespace_oid));
/* Search syscache by name only */
catlist = SearchSysCacheList1(PROCNAMEARGSNSP,
CStringGetDatum(orafce_sys_guid_source));
for (i = 0; i < catlist->n_members; i++)
{
HeapTuple proctup = &catlist->members[i]->tuple;
Form_pg_proc procform = (Form_pg_proc) GETSTRUCT(proctup);
/*
* Consider only procs in specified namespace, with zero
* arguments and uuid type as result
*/
if (procform->pronamespace != uuid_ossp_namespace_oid ||
procform->pronargs != 0 || procform->prorettype != UUIDOID)
continue;
result = procform->oid;
break;
}
ReleaseSysCacheList(catlist);
}
/* should be available if extension uuid-ossp is installed */
if (!OidIsValid(result))
elog(ERROR, "function \"%s\" doesn't exist", orafce_sys_guid_source);
uuid_generate_func_lxid = CURRENT_LXID;
uuid_generate_func_oid = result;
strcpy(uuid_generate_func_name, orafce_sys_guid_source);
*reset_fmgr = true;
}
else
*reset_fmgr = false;
Assert(OidIsValid(uuid_generate_func_oid));
return uuid_generate_func_oid;
}
PG_FUNCTION_INFO_V1(ora_lnnvl);
Datum
ora_lnnvl(PG_FUNCTION_ARGS)
{
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(true);
PG_RETURN_BOOL(!PG_GETARG_BOOL(0));
}
PG_FUNCTION_INFO_V1(ora_concat);
Datum
ora_concat(PG_FUNCTION_ARGS)
{
text *t1;
text *t2;
int l1;
int l2;
text *result;
if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
PG_RETURN_NULL();
if (PG_ARGISNULL(0))
PG_RETURN_DATUM(PG_GETARG_DATUM(1));
if (PG_ARGISNULL(1))
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
t1 = PG_GETARG_TEXT_PP(0);
t2 = PG_GETARG_TEXT_PP(1);
l1 = VARSIZE_ANY_EXHDR(t1);
l2 = VARSIZE_ANY_EXHDR(t2);
result = palloc(l1 + l2 + VARHDRSZ);
memcpy(VARDATA(result), VARDATA_ANY(t1), l1);
memcpy(VARDATA(result) + l1, VARDATA_ANY(t2), l2);
SET_VARSIZE(result, l1 + l2 + VARHDRSZ);
PG_RETURN_TEXT_P(result);
}
PG_FUNCTION_INFO_V1(ora_nvl);
Datum
ora_nvl(PG_FUNCTION_ARGS)
{
if (!PG_ARGISNULL(0))
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
if (!PG_ARGISNULL(1))
PG_RETURN_DATUM(PG_GETARG_DATUM(1));
PG_RETURN_NULL();
}
PG_FUNCTION_INFO_V1(ora_nvl2);
Datum
ora_nvl2(PG_FUNCTION_ARGS)
{
if (!PG_ARGISNULL(0))
{
if (!PG_ARGISNULL(1))
PG_RETURN_DATUM(PG_GETARG_DATUM(1));
}
else
{
if (!PG_ARGISNULL(2))
PG_RETURN_DATUM(PG_GETARG_DATUM(2));
}
PG_RETURN_NULL();
}
PG_FUNCTION_INFO_V1(ora_set_nls_sort);
Datum
ora_set_nls_sort(PG_FUNCTION_ARGS)
{
text *arg = PG_GETARG_TEXT_P(0);
if (def_locale != NULL)
{
pfree(def_locale);
def_locale = NULL;
}
def_locale = (text *) MemoryContextAlloc(TopMemoryContext, VARSIZE(arg));
memcpy(def_locale, arg, VARSIZE(arg));
PG_RETURN_VOID();
}
static text *
_nls_run_strxfrm(text *string, text *locale)
{
char *string_str;
int string_len;
char *locale_str = NULL;
text *result;
char *tmp = NULL;
size_t rest = 0;
bool changed_locale = false;
/*
* Save the default, server-wide locale setting. It should not change
* during the life-span of the server so it is safe to save it only once,
* during the first invocation.
*/
if (!lc_collate_cache)
{
if ((lc_collate_cache = setlocale(LC_COLLATE, NULL)))
/* Make a copy of the locale name string. */
#ifdef _MSC_VER
lc_collate_cache = _strdup(lc_collate_cache);
#else
lc_collate_cache = strdup(lc_collate_cache);
#endif
if (!lc_collate_cache)
elog(ERROR, "failed to retrieve the default LC_COLLATE value");
}
/*
* To run strxfrm, we need a zero-terminated strings.
*/
string_len = VARSIZE_ANY_EXHDR(string);
if (string_len < 0)
return NULL;
string_str = palloc(string_len + 1);
memcpy(string_str, VARDATA_ANY(string), string_len);
*(string_str + string_len) = '\0';
if (locale)
{
int locale_len = VARSIZE_ANY_EXHDR(locale);
/*
* If different than default locale is requested, call setlocale.
*/
if (locale_len > 0
&& (strncmp(lc_collate_cache, VARDATA_ANY(locale), locale_len)
|| *(lc_collate_cache + locale_len) != '\0'))
{
locale_str = palloc(locale_len + 1);
memcpy(locale_str, VARDATA_ANY(locale), locale_len);
*(locale_str + locale_len) = '\0';
/*
* Try to set correct locales. If setlocale failed, we know the
* default stayed the same, co we can safely elog.
*/
if (!setlocale(LC_COLLATE, locale_str))
elog(ERROR, "failed to set the requested LC_COLLATE value [%s]", locale_str);
changed_locale = true;
}
}
/*
* We do TRY / CATCH / END_TRY to catch ereport / elog that might happen
* during palloc. Ereport during palloc would not be nice since it would
* leave the server with changed locales setting, resulting in bad things.
*/
PG_TRY();
{
size_t size = 0;
/*
* Text transformation. Increase the buffer until the strxfrm is able
* to fit.
*/
size = string_len * multiplication + 1;
tmp = palloc(size + VARHDRSZ);
rest = strxfrm(tmp + VARHDRSZ, string_str, size);
while (rest >= size)
{
pfree(tmp);
size = rest + 1;
tmp = palloc(size + VARHDRSZ);
rest = strxfrm(tmp + VARHDRSZ, string_str, size);
/*
* Cache the multiplication factor so that the next time we start
* with better value.
*/
if (string_len)
multiplication = (rest / string_len) + 2;
}
}
PG_CATCH();
{
if (changed_locale)
{
/*
* Set original locale
*/
if (!setlocale(LC_COLLATE, lc_collate_cache))
elog(FATAL, "failed to set back the default LC_COLLATE value [%s]", lc_collate_cache);
}
PG_RE_THROW();
}
PG_END_TRY();
if (changed_locale)
{
/*
* Set original locale
*/
if (!setlocale(LC_COLLATE, lc_collate_cache))
elog(FATAL, "failed to set back the default LC_COLLATE value [%s]", lc_collate_cache);
pfree(locale_str);
}
pfree(string_str);
/*
* If the multiplication factor went down, reset it.
*/
if (string_len && rest < string_len * multiplication / 4)
multiplication = (rest / string_len) + 1;
result = (text *) tmp;
SET_VARSIZE(result, rest + VARHDRSZ);
return result;
}
PG_FUNCTION_INFO_V1(ora_nlssort);
Datum
ora_nlssort(PG_FUNCTION_ARGS)
{
text *locale;
text *result;
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
if (PG_ARGISNULL(1))
{
if (def_locale != NULL)
locale = def_locale;
else
{
locale = palloc(VARHDRSZ);
SET_VARSIZE(locale, VARHDRSZ);
}
}
else
{
locale = PG_GETARG_TEXT_PP(1);
}
result = _nls_run_strxfrm(PG_GETARG_TEXT_PP(0), locale);
if (!result)
PG_RETURN_NULL();
PG_RETURN_BYTEA_P(result);
}
PG_FUNCTION_INFO_V1(ora_decode);
/*
* decode(lhs, [rhs, ret], ..., [default])
*/
Datum
ora_decode(PG_FUNCTION_ARGS)
{
int nargs;
int i;
int retarg;
/* default value is last arg or NULL. */
nargs = PG_NARGS();
if (nargs % 2 == 0)
{
retarg = nargs - 1;
nargs -= 1; /* ignore the last argument */
}
else
retarg = -1; /* NULL */
if (PG_ARGISNULL(0))
{
for (i = 1; i < nargs; i += 2)
{
if (PG_ARGISNULL(i))
{
retarg = i + 1;
break;
}
}
}
else
{
FmgrInfo *eq;
Oid collation = PG_GET_COLLATION();
/*
* On first call, get the input type's operator '=' and save at
* fn_extra.
*/
if (fcinfo->flinfo->fn_extra == NULL)
{
MemoryContext oldctx;
Oid typid = get_fn_expr_argtype(fcinfo->flinfo, 0);
Oid eqoid = equality_oper_funcid(typid);
oldctx = MemoryContextSwitchTo(fcinfo->flinfo->fn_mcxt);
eq = palloc(sizeof(FmgrInfo));
fmgr_info(eqoid, eq);
MemoryContextSwitchTo(oldctx);
fcinfo->flinfo->fn_extra = eq;
}
else
eq = fcinfo->flinfo->fn_extra;
for (i = 1; i < nargs; i += 2)
{
Datum result;
if (PG_ARGISNULL(i))
continue;
result = FunctionCall2Coll(eq,
collation,
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(i));
if (DatumGetBool(result))
{
retarg = i + 1;
break;
}
}
}
if (retarg < 0 || PG_ARGISNULL(retarg))
PG_RETURN_NULL();
else
PG_RETURN_DATUM(PG_GETARG_DATUM(retarg));
}
Oid
equality_oper_funcid(Oid argtype)
{
Oid eq;
get_sort_group_operators(argtype, false, true, false, NULL, &eq, NULL, NULL);
return get_opcode(eq);
}
/*
* dump(anyexpr [,format])
*
* the dump function returns a varchar2 value that includes the datatype code,
* the length in bytes, and the internal representation of the expression.
*/
PG_FUNCTION_INFO_V1(orafce_dump);
static void
appendDatum(StringInfo str, const void *ptr, size_t length, int format)
{
if (ptr)
{
const unsigned char *s = (const unsigned char *) ptr;
const char *formatstr;
size_t i;
switch (format)
{
case 8:
formatstr = "%ho";
break;
case 10:
formatstr = "%hu";
break;
case 16:
formatstr = "%hx";
break;
case 17:
formatstr = "%hc";
break;
default:
elog(ERROR, "unknown format");
formatstr = NULL; /* quite compiler */
}
/* append a byte array with the specified format */
for (i = 0; i < length; i++)
{
if (i > 0)
appendStringInfoChar(str, ',');
/* print only ANSI visible chars */
if (format == 17 && (iscntrl(s[i]) || !isascii(s[i])))
appendStringInfoChar(str, '?');
else
appendStringInfo(str, formatstr, s[i]);
}
}
else
appendStringInfoChar(str, ':');
}
Datum
orafce_dump(PG_FUNCTION_ARGS)
{
Oid valtype = get_fn_expr_argtype(fcinfo->flinfo, 0);
int16 typlen;
bool typbyval;
Size length;
Datum value;
int format;
StringInfoData str;
if (!OidIsValid(valtype))
elog(ERROR, "function is called from invalid context");
if (PG_ARGISNULL(0))
elog(ERROR, "argument is NULL");
value = PG_GETARG_DATUM(0);
format = PG_GETARG_IF_EXISTS(1, INT32, 10);
get_typlenbyval(valtype, &typlen, &typbyval);
length = datumGetSize(value, typbyval, typlen);
initStringInfo(&str);
appendStringInfo(&str, "Typ=%d Len=%d: ", valtype, (int) length);
if (!typbyval)
{
appendDatum(&str, DatumGetPointer(value), length, format);
}
else if (length <= 1)
{
char v = DatumGetChar(value);
appendDatum(&str, &v, sizeof(char), format);
}
else if (length <= 2)
{
int16 v = DatumGetInt16(value);
appendDatum(&str, &v, sizeof(int16), format);
}
else if (length <= 4)
{
int32 v = DatumGetInt32(value);
appendDatum(&str, &v, sizeof(int32), format);
}
else
{
int64 v = DatumGetInt64(value);
appendDatum(&str, &v, sizeof(int64), format);
}
PG_RETURN_TEXT_P(cstring_to_text(str.data));
}
PG_FUNCTION_INFO_V1(ora_get_major_version);
/*
* Returns current version etc, PostgreSQL 9.6, PostgreSQL 10, ..
*/
Datum
ora_get_major_version(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text(PACKAGE_STRING));
}
PG_FUNCTION_INFO_V1(ora_get_major_version_num);
/*
* Returns major version number 9.5, 9.6, 10, 11, ..
*/
Datum
ora_get_major_version_num(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text(PG_MAJORVERSION));
}
PG_FUNCTION_INFO_V1(ora_get_full_version_num);
/*
* Returns version number string - 9.5.1, 10.2, ..
*/
Datum
ora_get_full_version_num(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text(PG_VERSION));
}
PG_FUNCTION_INFO_V1(ora_get_platform);
/*
* 32bit, 64bit
*/
Datum
ora_get_platform(PG_FUNCTION_ARGS)
{
#ifdef USE_FLOAT8_BYVAL
PG_RETURN_TEXT_P(cstring_to_text("64bit"));
#else
PG_RETURN_TEXT_P(cstring_to_text("32bit"));
#endif
}
PG_FUNCTION_INFO_V1(ora_get_status);
/*
* Production | Debug
*/
Datum
ora_get_status(PG_FUNCTION_ARGS)
{
#ifdef USE_ASSERT_CHECKING
PG_RETURN_TEXT_P(cstring_to_text("Debug"));
#else
PG_RETURN_TEXT_P(cstring_to_text("Production"));
#endif
}
PG_FUNCTION_INFO_V1(ora_greatest);
/*
* ora_greatest(anyarray) returns anyelement
*/
Datum
ora_greatest(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(ora_greatest_least(fcinfo, true));
}
PG_FUNCTION_INFO_V1(ora_least);
/*
* ora_least(anyarray) returns anyelement
*/
Datum
ora_least(PG_FUNCTION_ARGS)
{
PG_RETURN_DATUM(ora_greatest_least(fcinfo, false));
}
/*
* ora_greatest_least(anyarray, bool) returns anyelement
* Boolean parameter is true for greatest and false for least.
*/
static Datum
ora_greatest_least(FunctionCallInfo fcinfo, bool greater)
{
Datum result;
Datum value;
ArrayType *array;
ArrayIterator array_iterator;
Oid element_type;
Oid collation = PG_GET_COLLATION();
ArrayMetaState *my_extra = NULL;
bool isnull;
/* caller functions are marked as strict */
Assert(!PG_ARGISNULL(0));
Assert(!PG_ARGISNULL(1));
array = PG_GETARG_ARRAYTYPE_P(1);
element_type = ARR_ELEMTYPE(array);
Assert(element_type == get_fn_expr_argtype(fcinfo->flinfo, 0));
/* fast return */
if (array_contains_nulls(array))
PG_RETURN_NULL();
my_extra = (ArrayMetaState *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL)
{
my_extra = MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
sizeof(ArrayMetaState));
my_extra->element_type = ~element_type;
fcinfo->flinfo->fn_extra = my_extra;
}
if (my_extra->element_type != element_type)
{
Oid sortop_oid;
get_typlenbyvalalign(element_type,
&my_extra->typlen,
&my_extra->typbyval,
&my_extra->typalign);
if (greater)
get_sort_group_operators(element_type, false, false, true,
NULL, NULL, &sortop_oid, NULL);
else
get_sort_group_operators(element_type, true, false, false,
&sortop_oid, NULL, NULL, NULL);
my_extra->element_type = element_type;
fmgr_info_cxt(get_opcode(sortop_oid), &my_extra->proc,
fcinfo->flinfo->fn_mcxt);
}
/* Let's return the first parameter by default */
result = PG_GETARG_DATUM(0);
array_iterator = array_create_iterator(array, 0, my_extra);
while (array_iterate(array_iterator, &value, &isnull))
{
/* not nulls, so run the operator */
if (!DatumGetBool(FunctionCall2Coll(&my_extra->proc, collation,
result, value)))
result = value;
}
result = datumCopy(result, my_extra->typbyval, my_extra->typlen);
array_free_iterator(array_iterator);
/* Avoid leaking memory when handed toasted input */
PG_FREE_IF_COPY(array, 1);
PG_RETURN_DATUM(result);
}
PG_FUNCTION_INFO_V1(orafce_sys_guid);
/*
* Implementation of sys_guid() function
*
* Oracle uses guid based on mac address. The calculation is not too
* difficult, but there are lot of depenedencies necessary for taking
* mac address. Instead to making some static dependecies orafce uses
* dynamic dependency on "uuid-ossp" extension, and calls choosed function
* from this extension.
*/
Datum
orafce_sys_guid(PG_FUNCTION_ARGS)
{
bool reset_fmgr;
Oid funcoid;
pg_uuid_t *uuid;
bytea *result;
funcoid = get_uuid_generate_func_oid(&reset_fmgr);
if (reset_fmgr)
fmgr_info_cxt(funcoid,
&uuid_generate_func_finfo,
TopTransactionContext);
uuid = DatumGetUUIDP(FunctionCall0Coll(&uuid_generate_func_finfo,
InvalidOid));
result = palloc(VARHDRSZ + UUID_LEN);
SET_VARSIZE(result, VARHDRSZ + UUID_LEN);
memcpy(VARDATA(result), uuid->data, UUID_LEN);
PG_RETURN_BYTEA_P(result);
}