e26c539e9f
The purpose of this change is to eliminate the need for every caller of SearchSysCache, SearchSysCacheCopy, SearchSysCacheExists, GetSysCacheOid, and SearchSysCacheList to know the maximum number of allowable keys for a syscache entry (currently 4). This will make it far easier to increase the maximum number of keys in a future release should we choose to do so, and it makes the code shorter, too. Design and review by Tom Lane.
349 lines
9.7 KiB
C
349 lines
9.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* conversioncmds.c
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* conversion creation command support code
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*
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* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/conversioncmds.c,v 1.41 2010/02/14 18:42:14 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_conversion.h"
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#include "catalog/pg_conversion_fn.h"
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#include "catalog/pg_type.h"
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#include "commands/conversioncmds.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "parser/parse_func.h"
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#include "utils/acl.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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static void AlterConversionOwner_internal(Relation rel, Oid conversionOid,
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Oid newOwnerId);
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/*
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* CREATE CONVERSION
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*/
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void
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CreateConversionCommand(CreateConversionStmt *stmt)
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{
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Oid namespaceId;
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char *conversion_name;
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AclResult aclresult;
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int from_encoding;
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int to_encoding;
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Oid funcoid;
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const char *from_encoding_name = stmt->for_encoding_name;
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const char *to_encoding_name = stmt->to_encoding_name;
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List *func_name = stmt->func_name;
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static Oid funcargs[] = {INT4OID, INT4OID, CSTRINGOID, INTERNALOID, INT4OID};
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char result[1];
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/* Convert list of names to a name and namespace */
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namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name,
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&conversion_name);
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/* Check we have creation rights in target namespace */
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aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(namespaceId));
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/* Check the encoding names */
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from_encoding = pg_char_to_encoding(from_encoding_name);
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if (from_encoding < 0)
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("source encoding \"%s\" does not exist",
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from_encoding_name)));
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to_encoding = pg_char_to_encoding(to_encoding_name);
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if (to_encoding < 0)
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("destination encoding \"%s\" does not exist",
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to_encoding_name)));
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/*
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* Check the existence of the conversion function. Function name could be
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* a qualified name.
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*/
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funcoid = LookupFuncName(func_name, sizeof(funcargs) / sizeof(Oid),
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funcargs, false);
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/* Check it returns VOID, else it's probably the wrong function */
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if (get_func_rettype(funcoid) != VOIDOID)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
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errmsg("encoding conversion function %s must return type \"void\"",
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NameListToString(func_name))));
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/* Check we have EXECUTE rights for the function */
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aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_PROC,
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NameListToString(func_name));
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/*
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* Check that the conversion function is suitable for the requested source
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* and target encodings. We do that by calling the function with an empty
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* string; the conversion function should throw an error if it can't
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* perform the requested conversion.
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*/
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OidFunctionCall5(funcoid,
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Int32GetDatum(from_encoding),
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Int32GetDatum(to_encoding),
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CStringGetDatum(""),
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CStringGetDatum(result),
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Int32GetDatum(0));
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/*
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* All seem ok, go ahead (possible failure would be a duplicate conversion
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* name)
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*/
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ConversionCreate(conversion_name, namespaceId, GetUserId(),
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from_encoding, to_encoding, funcoid, stmt->def);
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}
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/*
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* DROP CONVERSION
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*/
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void
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DropConversionsCommand(DropStmt *drop)
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{
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ObjectAddresses *objects;
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ListCell *cell;
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/*
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* First we identify all the conversions, then we delete them in a single
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* performMultipleDeletions() call. This is to avoid unwanted DROP
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* RESTRICT errors if one of the conversions depends on another. (Not that
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* that is very likely, but we may as well do this consistently.)
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*/
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objects = new_object_addresses();
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foreach(cell, drop->objects)
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{
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List *name = (List *) lfirst(cell);
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Oid conversionOid;
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HeapTuple tuple;
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Form_pg_conversion con;
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ObjectAddress object;
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conversionOid = FindConversionByName(name);
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if (!OidIsValid(conversionOid))
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{
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if (!drop->missing_ok)
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{
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("conversion \"%s\" does not exist",
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NameListToString(name))));
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}
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else
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{
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ereport(NOTICE,
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(errmsg("conversion \"%s\" does not exist, skipping",
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NameListToString(name))));
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}
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continue;
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}
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tuple = SearchSysCache1(CONVOID, ObjectIdGetDatum(conversionOid));
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "cache lookup failed for conversion %u",
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conversionOid);
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con = (Form_pg_conversion) GETSTRUCT(tuple);
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/* Permission check: must own conversion or its namespace */
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if (!pg_conversion_ownercheck(conversionOid, GetUserId()) &&
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!pg_namespace_ownercheck(con->connamespace, GetUserId()))
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aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
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NameStr(con->conname));
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object.classId = ConversionRelationId;
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object.objectId = conversionOid;
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object.objectSubId = 0;
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add_exact_object_address(&object, objects);
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ReleaseSysCache(tuple);
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}
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performMultipleDeletions(objects, drop->behavior);
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free_object_addresses(objects);
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}
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/*
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* Rename conversion
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*/
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void
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RenameConversion(List *name, const char *newname)
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{
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Oid conversionOid;
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Oid namespaceOid;
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HeapTuple tup;
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Relation rel;
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AclResult aclresult;
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rel = heap_open(ConversionRelationId, RowExclusiveLock);
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conversionOid = FindConversionByName(name);
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if (!OidIsValid(conversionOid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("conversion \"%s\" does not exist",
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NameListToString(name))));
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tup = SearchSysCacheCopy1(CONVOID, ObjectIdGetDatum(conversionOid));
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if (!HeapTupleIsValid(tup)) /* should not happen */
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elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
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namespaceOid = ((Form_pg_conversion) GETSTRUCT(tup))->connamespace;
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/* make sure the new name doesn't exist */
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if (SearchSysCacheExists2(CONNAMENSP,
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CStringGetDatum(newname),
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ObjectIdGetDatum(namespaceOid)))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_OBJECT),
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errmsg("conversion \"%s\" already exists in schema \"%s\"",
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newname, get_namespace_name(namespaceOid))));
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/* must be owner */
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if (!pg_conversion_ownercheck(conversionOid, GetUserId()))
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aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
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NameListToString(name));
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/* must have CREATE privilege on namespace */
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aclresult = pg_namespace_aclcheck(namespaceOid, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(namespaceOid));
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/* rename */
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namestrcpy(&(((Form_pg_conversion) GETSTRUCT(tup))->conname), newname);
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simple_heap_update(rel, &tup->t_self, tup);
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CatalogUpdateIndexes(rel, tup);
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heap_close(rel, NoLock);
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heap_freetuple(tup);
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}
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/*
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* Change conversion owner, by name
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*/
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void
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AlterConversionOwner(List *name, Oid newOwnerId)
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{
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Oid conversionOid;
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Relation rel;
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rel = heap_open(ConversionRelationId, RowExclusiveLock);
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conversionOid = FindConversionByName(name);
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if (!OidIsValid(conversionOid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("conversion \"%s\" does not exist",
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NameListToString(name))));
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AlterConversionOwner_internal(rel, conversionOid, newOwnerId);
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heap_close(rel, NoLock);
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}
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/*
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* Change conversion owner, by oid
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*/
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void
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AlterConversionOwner_oid(Oid conversionOid, Oid newOwnerId)
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{
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Relation rel;
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rel = heap_open(ConversionRelationId, RowExclusiveLock);
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AlterConversionOwner_internal(rel, conversionOid, newOwnerId);
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heap_close(rel, NoLock);
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}
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/*
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* AlterConversionOwner_internal
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*
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* Internal routine for changing the owner. rel must be pg_conversion, already
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* open and suitably locked; it will not be closed.
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*/
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static void
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AlterConversionOwner_internal(Relation rel, Oid conversionOid, Oid newOwnerId)
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{
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Form_pg_conversion convForm;
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HeapTuple tup;
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Assert(RelationGetRelid(rel) == ConversionRelationId);
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tup = SearchSysCacheCopy1(CONVOID, ObjectIdGetDatum(conversionOid));
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if (!HeapTupleIsValid(tup)) /* should not happen */
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elog(ERROR, "cache lookup failed for conversion %u", conversionOid);
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convForm = (Form_pg_conversion) GETSTRUCT(tup);
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/*
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* If the new owner is the same as the existing owner, consider the
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* command to have succeeded. This is for dump restoration purposes.
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*/
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if (convForm->conowner != newOwnerId)
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{
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AclResult aclresult;
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/* Superusers can always do it */
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if (!superuser())
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{
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/* Otherwise, must be owner of the existing object */
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if (!pg_conversion_ownercheck(HeapTupleGetOid(tup), GetUserId()))
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aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CONVERSION,
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NameStr(convForm->conname));
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/* Must be able to become new owner */
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check_is_member_of_role(GetUserId(), newOwnerId);
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/* New owner must have CREATE privilege on namespace */
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aclresult = pg_namespace_aclcheck(convForm->connamespace,
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newOwnerId,
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ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
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get_namespace_name(convForm->connamespace));
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}
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/*
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* Modify the owner --- okay to scribble on tup because it's a copy
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*/
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convForm->conowner = newOwnerId;
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simple_heap_update(rel, &tup->t_self, tup);
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CatalogUpdateIndexes(rel, tup);
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/* Update owner dependency reference */
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changeDependencyOnOwner(ConversionRelationId, conversionOid,
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newOwnerId);
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}
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heap_freetuple(tup);
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}
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