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pg_variables.c
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pg_variables.c
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/*-------------------------------------------------------------------------
*
* pg_variables.c
* Functions, which get or set variables values
*
* Copyright (c) 2015-2016, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "parser/scansup.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/timestamp.h"
#include "utils/typcache.h"
#include "pg_variables.h"
PG_MODULE_MAGIC;
/* Functions to work with records */
PG_FUNCTION_INFO_V1(variable_insert);
PG_FUNCTION_INFO_V1(variable_update);
PG_FUNCTION_INFO_V1(variable_delete);
PG_FUNCTION_INFO_V1(variable_select);
PG_FUNCTION_INFO_V1(variable_select_by_value);
PG_FUNCTION_INFO_V1(variable_select_by_values);
/* Functions to work with packages */
PG_FUNCTION_INFO_V1(variable_exists);
PG_FUNCTION_INFO_V1(package_exists);
PG_FUNCTION_INFO_V1(remove_variable);
PG_FUNCTION_INFO_V1(remove_package);
PG_FUNCTION_INFO_V1(remove_packages);
PG_FUNCTION_INFO_V1(get_packages_and_variables);
PG_FUNCTION_INFO_V1(get_packages_stats);
extern void _PG_init(void);
extern void _PG_fini(void);
static void ensurePackagesHashExists(void);
static void getKeyFromName(text *name, char *key);
static Package *getPackage(text *name, bool strict);
static Package *createPackage(text *name, bool is_trans);
static Variable *getVariableInternal(Package *package, text *name,
Oid typid, bool is_record, bool strict);
static Variable *createVariableInternal(Package *package, text *name, Oid typid,
bool is_record, bool is_transactional);
static void removePackageInternal(Package *package);
static void resetVariablesCache(bool with_package);
/* Functions to work with transactional objects */
static void createSavepoint(TransObject *object, TransObjectType type);
static void releaseSavepoint(TransObject *object, TransObjectType type);
static void rollbackSavepoint(TransObject *object, TransObjectType type);
static void copyValue(VarState *src, VarState *dest, Variable *destVar);
static void freeValue(VarState *varstate, bool is_record);
static void removeState(TransObject *object, TransObjectType type,
TransState *stateToDelete);
static bool isObjectChangedInCurrentTrans(TransObject *object);
static bool isObjectChangedInUpperTrans(TransObject *object);
static void addToChangesStack(TransObject *object, TransObjectType type);
static void pushChangesStack(void);
/* Constructors */
static void makePackHTAB(Package *package, bool is_trans);
static inline ChangedObject *makeChangedObject(TransObject *object,
MemoryContext ctx);
/* Hook functions */
static void variable_ExecutorEnd(QueryDesc *queryDesc);
#define CHECK_ARGS_FOR_NULL() \
do { \
if (fcinfo->argnull[0]) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("package name can not be NULL"))); \
if (fcinfo->argnull[1]) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("variable name can not be NULL"))); \
} while(0)
static HTAB *packagesHash = NULL;
static MemoryContext ModuleContext = NULL;
/* Recent package */
static Package *LastPackage = NULL;
/* Recent variable */
static Variable *LastVariable = NULL;
/* Recent row type id */
static Oid LastTypeId = InvalidOid;
/*
* Cache sequentially search through hash table status. It is necessary for
* clean up if hash_seq_term() wasn't called or if we didn't scan the whole
* table. In this case we need to manually call hash_seq_term() within
* variable_ExecutorEnd().
*/
static HASH_SEQ_STATUS *LastHSeqStatus = NULL;
/* Saved hook values for recall */
static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
/* This stack contains lists of changed variables and packages per each subxact level */
static dlist_head *changesStack = NULL;
static MemoryContext changesStackContext = NULL;
/* Returns a lists of packages and variables changed at current subxact level */
#define get_actual_changes_list() \
( \
AssertMacro(changesStack != NULL), \
(dlist_head_element(ChangesStackNode, node, changesStack)) \
)
#define pack_hctx(pack, is_trans) \
(is_trans ? pack->hctxTransact : pack->hctxRegular)
#define pack_htab(pack, is_trans) \
(is_trans ? pack->varHashTransact : pack->varHashRegular)
#define PGV_MCXT_MAIN "pg_variables: main memory context"
#define PGV_MCXT_VARS "pg_variables: variables hash"
#define PGV_MCXT_STACK "pg_variables: changesStack"
#define PGV_MCXT_STACK_NODE "pg_variables: changesStackNode"
#ifndef ALLOCSET_DEFAULT_SIZES
#define ALLOCSET_DEFAULT_SIZES \
ALLOCSET_DEFAULT_MINSIZE, ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE
#endif
#ifndef ALLOCSET_START_SMALL_SIZES
#define ALLOCSET_START_SMALL_SIZES \
ALLOCSET_SMALL_MINSIZE, ALLOCSET_SMALL_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE
#endif
/*
* Set value of variable, typlen could be 0 if typbyval == true
*/
static void
variable_set(text *package_name, text *var_name,
Oid typid, Datum value, bool is_null, bool is_transactional)
{
Package *package;
Variable *variable;
ScalarVar *scalar;
package = createPackage(package_name, is_transactional);
variable = createVariableInternal(package, var_name, typid, false,
is_transactional);
scalar = &(GetActualValue(variable).scalar);
/* Release memory for variable */
if (scalar->typbyval == false && scalar->is_null == false)
pfree(DatumGetPointer(scalar->value));
scalar->is_null = is_null;
if (!scalar->is_null)
{
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(pack_hctx(package, is_transactional));
scalar->value = datumCopy(value, scalar->typbyval, scalar->typlen);
MemoryContextSwitchTo(oldcxt);
}
else
scalar->value = 0;
}
static Datum
variable_get(text *package_name, text *var_name,
Oid typid, bool *is_null, bool strict)
{
Package *package;
Variable *variable;
ScalarVar *scalar;
package = getPackage(package_name, strict);
if (package == NULL)
{
*is_null = true;
return 0;
}
variable = getVariableInternal(package, var_name, typid, false, strict);
if (variable == NULL)
{
*is_null = true;
return 0;
}
scalar = &(GetActualValue(variable).scalar);
*is_null = scalar->is_null;
return scalar->value;
}
#define VARIABLE_GET_TEMPLATE(pkg_arg, var_arg, strict_arg, type, typid) \
PG_FUNCTION_INFO_V1(variable_get_##type); \
Datum \
variable_get_##type(PG_FUNCTION_ARGS) \
{ \
text *package_name; \
text *var_name; \
bool strict; \
bool isnull; \
Datum value; \
\
CHECK_ARGS_FOR_NULL(); \
\
package_name = PG_GETARG_TEXT_PP(pkg_arg); \
var_name = PG_GETARG_TEXT_PP(var_arg); \
strict = PG_GETARG_BOOL(strict_arg); \
\
value = variable_get(package_name, var_name, \
(typid), &isnull, strict); \
\
PG_FREE_IF_COPY(package_name, pkg_arg); \
PG_FREE_IF_COPY(var_name, var_arg); \
\
if (!isnull) \
PG_RETURN_DATUM(value); \
else \
PG_RETURN_NULL(); \
}
/* deprecated functions */
VARIABLE_GET_TEMPLATE(0, 1, 2, int, INT4OID)
VARIABLE_GET_TEMPLATE(0, 1, 2, text, TEXTOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, numeric, NUMERICOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, timestamp, TIMESTAMPOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, timestamptz, TIMESTAMPTZOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, date, DATEOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, jsonb, JSONBOID)
/* current API */
VARIABLE_GET_TEMPLATE(0, 1, 3, any, get_fn_expr_argtype(fcinfo->flinfo, 2))
VARIABLE_GET_TEMPLATE(0, 1, 3, array, get_fn_expr_argtype(fcinfo->flinfo, 2))
#define VARIABLE_SET_TEMPLATE(type, typid) \
PG_FUNCTION_INFO_V1(variable_set_##type); \
Datum \
variable_set_##type(PG_FUNCTION_ARGS) \
{ \
text *package_name; \
text *var_name; \
bool is_transactional; \
\
CHECK_ARGS_FOR_NULL(); \
\
package_name = PG_GETARG_TEXT_PP(0); \
var_name = PG_GETARG_TEXT_PP(1); \
is_transactional = PG_GETARG_BOOL(3); \
\
variable_set(package_name, var_name, (typid), \
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2), \
PG_ARGISNULL(2), is_transactional); \
\
PG_FREE_IF_COPY(package_name, 0); \
PG_FREE_IF_COPY(var_name, 1); \
PG_RETURN_VOID(); \
}
/* deprecated functions */
VARIABLE_SET_TEMPLATE(int, INT4OID)
VARIABLE_SET_TEMPLATE(text, TEXTOID)
VARIABLE_SET_TEMPLATE(numeric, NUMERICOID)
VARIABLE_SET_TEMPLATE(timestamp, TIMESTAMPOID)
VARIABLE_SET_TEMPLATE(timestamptz, TIMESTAMPTZOID)
VARIABLE_SET_TEMPLATE(date, DATEOID)
VARIABLE_SET_TEMPLATE(jsonb, JSONBOID)
/* current API */
VARIABLE_SET_TEMPLATE(any, get_fn_expr_argtype(fcinfo->flinfo, 2))
VARIABLE_SET_TEMPLATE(array, get_fn_expr_argtype(fcinfo->flinfo, 2))
Datum
variable_insert(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HeapTupleHeader rec;
Package *package;
Variable *variable;
bool is_transactional;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc = NULL;
RecordVar *record;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("record argument can not be NULL")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
rec = PG_GETARG_HEAPTUPLEHEADER(2);
is_transactional = PG_GETARG_BOOL(3);
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0 ||
!pack_htab(LastPackage, is_transactional))
{
package = createPackage(package_name, is_transactional);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = createVariableInternal(package, var_name, RECORDOID,
true, is_transactional);
LastVariable = variable;
}
else
{
TransObject *transObj;
if (LastVariable->is_transactional != is_transactional)
{
char key[NAMEDATALEN];
getKeyFromName(var_name, key);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("variable \"%s\" already created as %sTRANSACTIONAL",
key, LastVariable->is_transactional ? "" : "NOT ")));
}
variable = LastVariable;
transObj = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObj))
{
createSavepoint(transObj, TRANS_VARIABLE);
addToChangesStack(transObj, TRANS_VARIABLE);
}
}
/* Insert a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
record = &(GetActualValue(variable).record);
if (!record->tupdesc)
{
/*
* This is the first record for the var_name. Initialize record.
*/
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
init_record(record, tupdesc, variable);
}
else if (LastTypeId == RECORDOID || !OidIsValid(LastTypeId) ||
LastTypeId != tupType)
{
/*
* We need to check attributes of the new row if this is a transient
* record type or if last record has different id.
*/
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
check_attributes(variable, tupdesc);
}
LastTypeId = tupType;
insert_record(variable, rec);
/* Release resources */
if (tupdesc)
ReleaseTupleDesc(tupdesc);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_update(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HeapTupleHeader rec;
Package *package;
Variable *variable;
TransObject *transObject;
bool res;
Oid tupType;
int32 tupTypmod;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("record argument can not be NULL")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
rec = PG_GETARG_HEAPTUPLEHEADER(2);
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackage(package_name, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
LastVariable = variable;
}
else
variable = LastVariable;
transObject = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObject))
{
createSavepoint(transObject, TRANS_VARIABLE);
addToChangesStack(transObject, TRANS_VARIABLE);
}
/* Update a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
if (LastTypeId == RECORDOID || !OidIsValid(LastTypeId) ||
LastTypeId != tupType)
{
TupleDesc tupdesc = NULL;
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
check_attributes(variable, tupdesc);
ReleaseTupleDesc(tupdesc);
}
LastTypeId = tupType;
res = update_record(variable, rec);
/* Release resources */
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(res);
}
Datum
variable_delete(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Oid value_type;
Datum value;
bool value_is_null = PG_ARGISNULL(2);
Package *package;
Variable *variable;
TransObject *transObject;
bool res;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
if (!value_is_null)
{
value_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
value = PG_GETARG_DATUM(2);
}
else
{
value_type = InvalidOid;
value = 0;
}
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackage(package_name, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
LastVariable = variable;
}
else
variable = LastVariable;
transObject = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObject))
{
createSavepoint(transObject, TRANS_VARIABLE);
addToChangesStack(transObject, TRANS_VARIABLE);
}
/* Delete a record */
if (!value_is_null)
check_record_key(variable, value_type);
res = delete_record(variable, value, value_is_null);
/* Release resources */
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(res);
}
Datum
variable_select(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
HASH_SEQ_STATUS *rstat;
HashRecordEntry *item;
if (SRF_IS_FIRSTCALL())
{
text *package_name;
text *var_name;
Package *package;
Variable *variable;
MemoryContext oldcontext;
RecordVar *record;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackage(package_name, true);
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
record = &(GetActualValue(variable).record);
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
funcctx->tuple_desc = CreateTupleDescCopy(record->tupdesc);
rstat = (HASH_SEQ_STATUS *) palloc0(sizeof(HASH_SEQ_STATUS));
hash_seq_init(rstat, record->rhash);
funcctx->user_fctx = rstat;
MemoryContextSwitchTo(oldcontext);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
LastHSeqStatus = rstat;
}
funcctx = SRF_PERCALL_SETUP();
/* Get next hash record */
rstat = (HASH_SEQ_STATUS *) funcctx->user_fctx;
item = (HashRecordEntry *) hash_seq_search(rstat);
if (item != NULL)
{
Datum result;
result = HeapTupleGetDatum(item->tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
LastHSeqStatus = NULL;
pfree(rstat);
SRF_RETURN_DONE(funcctx);
}
}
Datum
variable_select_by_value(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Oid value_type;
Datum value;
bool value_is_null = PG_ARGISNULL(2);
Package *package;
Variable *variable;
HashRecordEntry *item;
RecordVar *record;
HashRecordKey k;
bool found;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
if (!value_is_null)
{
value_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
value = PG_GETARG_DATUM(2);
}
else
{
value_type = InvalidOid;
value = 0;
}
package = getPackage(package_name, true);
variable = getVariableInternal(package, var_name, RECORDOID, true, true);
if (!value_is_null)
check_record_key(variable, value_type);
record = &(GetActualValue(variable).record);
/* Search a record */
k.value = value;
k.is_null = value_is_null;
k.hash_proc = &record->hash_proc;
k.cmp_proc = &record->cmp_proc;
item = (HashRecordEntry *) hash_search(record->rhash, &k,
HASH_FIND, &found);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (found)
PG_RETURN_DATUM(HeapTupleGetDatum(item->tuple));
else
PG_RETURN_NULL();
}
/* Structure for variable_select_by_values() */
typedef struct
{
Variable *variable;
ArrayIterator iterator;
} VariableIteratorRec;
Datum
variable_select_by_values(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
VariableIteratorRec *var;
Datum value;
HashRecordEntry *item;
bool isnull;
if (SRF_IS_FIRSTCALL())
{
text *package_name;
text *var_name;
ArrayType *values;
Package *package;
Variable *variable;
MemoryContext oldcontext;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("array argument can not be NULL")));
values = PG_GETARG_ARRAYTYPE_P(2);
if (ARR_NDIM(values) > 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("searching for elements in multidimensional arrays is not supported")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackage(package_name, true);
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
check_record_key(variable, ARR_ELEMTYPE(values));
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
funcctx->tuple_desc = CreateTupleDescCopy(GetActualValue(variable).record.tupdesc);
var = (VariableIteratorRec *) palloc(sizeof(VariableIteratorRec));
var->iterator = array_create_iterator(values, 0, NULL);
var->variable = variable;
funcctx->user_fctx = var;
MemoryContextSwitchTo(oldcontext);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
}
funcctx = SRF_PERCALL_SETUP();
var = (VariableIteratorRec *) funcctx->user_fctx;
/* Get next array element */
while (array_iterate(var->iterator, &value, &isnull))
{
HashRecordKey k;
bool found;
RecordVar *record;
record = &(GetActualValue(var->variable).record);
/* Search a record */
k.value = value;
k.is_null = isnull;
k.hash_proc = &record->hash_proc;
k.cmp_proc = &record->cmp_proc;
item = (HashRecordEntry *) hash_search(record->rhash, &k,
HASH_FIND, &found);
if (found)
{
Datum result;
result = HeapTupleGetDatum(item->tuple);
SRF_RETURN_NEXT(funcctx, result);
}
}
array_free_iterator(var->iterator);
pfree(var);
SRF_RETURN_DONE(funcctx);
}
/*
* Check if variable exists.
*/
Datum
variable_exists(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Package *package;
Variable *variable;
char key[NAMEDATALEN];
bool found = false;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackage(package_name, false);
if (package == NULL)
{
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(false);
}
getKeyFromName(var_name, key);
if (package->varHashRegular)
variable = (Variable *) hash_search(package->varHashRegular,
key, HASH_FIND, &found);
if (!found && package->varHashTransact)
variable = (Variable *) hash_search(package->varHashTransact,
key, HASH_FIND, &found);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(found ? GetActualState(variable)->is_valid : found);
}
/*
* Check if package exists.
*/
Datum
package_exists(PG_FUNCTION_ARGS)
{
text *package_name;
bool res;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("package name can not be NULL")));
package_name = PG_GETARG_TEXT_PP(0);
res = getPackage(package_name, false) != NULL;
PG_FREE_IF_COPY(package_name, 0);
PG_RETURN_BOOL(res);
}
/*
* Remove variable from package by name.
*/
Datum
remove_variable(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Package *package;
Variable *variable;
TransObject *transObject;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackage(package_name, true);
variable = getVariableInternal(package, var_name, InvalidOid, false, true);
/* Add package to changes list, so we can remove it if it is empty */
if (!isObjectChangedInCurrentTrans(&package->transObject))
{
createSavepoint(&package->transObject, TRANS_PACKAGE);
addToChangesStack(&package->transObject, TRANS_PACKAGE);
}
transObject = &variable->transObject;
if (variable->is_transactional)
{
if (!isObjectChangedInCurrentTrans(transObject))
{
createSavepoint(transObject, TRANS_VARIABLE);
addToChangesStack(transObject, TRANS_VARIABLE);
}
GetActualState(variable)->is_valid = false;
}
else
removeObject(&variable->transObject, TRANS_VARIABLE);
resetVariablesCache(false);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
/*
* Remove package by name.
*/
Datum
remove_package(PG_FUNCTION_ARGS)
{
Package *package;
text *package_name;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("package name can not be NULL")));
package_name = PG_GETARG_TEXT_PP(0);
package = getPackage(package_name, true);
removePackageInternal(package);
resetVariablesCache(true);
PG_FREE_IF_COPY(package_name, 0);
PG_RETURN_VOID();
}
static void
removePackageInternal(Package *package)
{
TransObject *transObject;
/* All regular variables will be freed */
if (package->hctxRegular)
{
MemoryContextDelete(package->hctxRegular);
package->hctxRegular = NULL;
package->varHashRegular = NULL;
}
/* Add to changes list */
transObject = &package->transObject;
if (!isObjectChangedInCurrentTrans(transObject))
{
createSavepoint(transObject, TRANS_PACKAGE);
addToChangesStack(transObject, TRANS_PACKAGE);
}
GetActualState(package)->is_valid = false;
}
static bool
isPackageEmpty(Package *package)
{
int var_num = 0;
if (package->varHashTransact)
var_num += hash_get_num_entries(package->varHashTransact);
if (package->varHashRegular)
var_num += hash_get_num_entries(package->varHashRegular);
return var_num == 0;
}
/*
* Reset cache variables to their default values. It is necessary to do in case
* of some changes: removing, rollbacking, etc.
*/
static void
resetVariablesCache(bool with_package)
{
/* Remove package and variable from cache */
if (with_package)
LastPackage = NULL;
LastVariable = NULL;
LastTypeId = InvalidOid;
}
/*
* Remove all packages and variables.
* Memory context will be released after committing.
*/
Datum
remove_packages(PG_FUNCTION_ARGS)
{
Package *package;
HASH_SEQ_STATUS pstat;
/* There is no any packages and variables */
if (packagesHash == NULL)
PG_RETURN_VOID();
/* Get packages list */
hash_seq_init(&pstat, packagesHash);
while ((package = (Package *) hash_seq_search(&pstat)) != NULL)
{