/*
* CREATE CONVERSION
*/
void
CreateConversionCommand(CreateConversionStmt *stmt)
{
Oid namespaceId;
char *conversion_name;
AclResult aclresult;
int from_encoding;
int to_encoding;
Oid funcoid;
const char *from_encoding_name = stmt->for_encoding_name;
const char *to_encoding_name = stmt->to_encoding_name;
List *func_name = stmt->func_name;
static Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
/* Convert list of names to a name and namespace */
namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
&conversion_name);
/* Check we have creation rights in target namespace */
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceId));
/* Check the encoding names */
from_encoding = pg_char_to_encoding(from_encoding_name);
if (from_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("source encoding \"%s\" does not exist",
from_encoding_name)));
to_encoding = pg_char_to_encoding(to_encoding_name);
if (to_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("destination encoding \"%s\" does not exist",
to_encoding_name)));
/*
* Check the existence of the conversion function. Function name could
* be a qualified name.
*/
funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
funcargs, false);
/* Check we have EXECUTE rights for the function */
aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_PROC,
NameListToString(func_name));
/*
* All seem ok, go ahead (possible failure would be a duplicate
* conversion name)
*/
ConversionCreate(conversion_name, namespaceId, GetUserId(),
from_encoding, to_encoding, funcoid, stmt->def);
}
/*
* CREATE CONVERSION
*/
ObjectAddress
CreateConversionCommand(CreateConversionStmt *stmt)
{
Oid namespaceId;
char *conversion_name;
AclResult aclresult;
int from_encoding;
int to_encoding;
Oid funcoid;
const char *from_encoding_name = stmt->for_encoding_name;
const char *to_encoding_name = stmt->to_encoding_name;
List *func_name = stmt->func_name;
static const Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
char result[1];
/* Convert list of names to a name and namespace */
namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
&conversion_name);
/* Check we have creation rights in target namespace */
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceId));
/* Check the encoding names */
from_encoding = pg_char_to_encoding(from_encoding_name);
if (from_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("source encoding \"%s\" does not exist",
from_encoding_name)));
to_encoding = pg_char_to_encoding(to_encoding_name);
if (to_encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("destination encoding \"%s\" does not exist",
to_encoding_name)));
/*
* Check the existence of the conversion function. Function name could be
* a qualified name.
*/
funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
funcargs, false);
/* Check it returns VOID, else it's probably the wrong function */
if (get_func_rettype(funcoid) != VOIDOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("encoding conversion function %s must return type %s",
NameListToString(func_name), "void")));
/* Check we have EXECUTE rights for the function */
aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_PROC,
NameListToString(func_name));
/*
* Check that the conversion function is suitable for the requested source
* and target encodings. We do that by calling the function with an empty
* string; the conversion function should throw an error if it can't
* perform the requested conversion.
*/
OidFunctionCall5(funcoid,
Int32GetDatum(from_encoding),
Int32GetDatum(to_encoding),
CStringGetDatum(""),
CStringGetDatum(result),
Int32GetDatum(0));
/*
* All seem ok, go ahead (possible failure would be a duplicate conversion
* name)
*/
return ConversionCreate(conversion_name, namespaceId, GetUserId(),
from_encoding, to_encoding, funcoid, stmt->def);
}
