postgresql/src/backend/commands/foreigncmds.c

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/*-------------------------------------------------------------------------
*
* foreigncmds.c
* foreign-data wrapper/server creation/manipulation commands
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/foreigncmds.c,v 1.1 2008/12/19 16:25:17 petere Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/reloptions.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/pg_foreign_data_wrapper.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_type.h"
#include "catalog/pg_user_mapping.h"
#include "commands/defrem.h"
#include "foreign/foreign.h"
#include "miscadmin.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
/*
* Convert a DefElem list to the text array format that is used in
* pg_foreign_data_wrapper, pg_foreign_server, and pg_user_mapping.
*
* Note: The array is usually stored to database without further
* processing, hence any validation should be done before this
* conversion.
*/
static Datum
optionListToArray(List *options)
{
ArrayBuildState *astate = NULL;
ListCell *cell;
text *t;
foreach (cell, options)
{
DefElem *def = lfirst(cell);
const char *value = "";
Size len;
value = defGetString(def);
len = VARHDRSZ + strlen(def->defname) + 1 + strlen(value);
t = palloc(len + 1);
SET_VARSIZE(t, len);
sprintf(VARDATA(t), "%s=%s", def->defname, value);
astate = accumArrayResult(astate, PointerGetDatum(t),
false, TEXTOID,
CurrentMemoryContext);
}
if (astate)
return makeArrayResult(astate, CurrentMemoryContext);
return PointerGetDatum(NULL);
}
/*
* Transform the list of OptionDefElem into list of generic options.
* The result is converted to array of text suitable for storing in
* options.
*
* This is used by CREATE/ALTER of FOREIGN DATA WRAPPER/SERVER/USER
* MAPPING. In the ALTER cases, oldOptions is the current text array
* of options.
*/
static Datum
transformGenericOptions(Datum oldOptions,
List *optionDefList,
GenericOptionFlags flags,
ForeignDataWrapper *fdw,
OptionListValidatorFunc validateOptionList)
{
List *resultOptions = untransformRelOptions(oldOptions);
ListCell *optcell;
foreach (optcell, optionDefList)
{
ListCell *cell;
ListCell *prev = NULL;
OptionDefElem *od = lfirst(optcell);
/*
* Find the element in resultOptions. We need this for
* validation in all cases.
*/
foreach (cell, resultOptions)
{
DefElem *def = lfirst(cell);
if (strcmp(def->defname, od->def->defname) == 0)
break;
else
prev = cell;
}
/*
* It is possible to perform multiple SET/DROP actions on the
* same option. The standard permits this, as long as the
* options to be added are unique.
*/
switch (od->alter_op)
{
case ALTER_OPT_DROP:
if (!cell)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("option \"%s\" not found",
od->def->defname)));
resultOptions = list_delete_cell(resultOptions, cell, prev);
break;
case ALTER_OPT_SET:
if (!cell)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("option \"%s\" not found",
od->def->defname)));
lfirst(cell) = od->def;
break;
case ALTER_OPT_ADD:
if (cell)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("option \"%s\" provided more than once",
od->def->defname)));
resultOptions = lappend(resultOptions, od->def);
break;
default:
elog(ERROR, "unrecognized action %d on option \"%s\"",
od->alter_op, od->def->defname);
break;
}
}
if (validateOptionList)
validateOptionList(fdw, flags, resultOptions);
return optionListToArray(resultOptions);
}
/*
* Convert the user mapping user name to OID
*/
static Oid
GetUserOidFromMapping(const char *username, bool missing_ok)
{
if (!username)
/* PUBLIC user mapping */
return InvalidOid;
if (strcmp(username, "current_user") == 0)
/* map to the owner */
return GetUserId();
/* map to provided user */
return missing_ok ? get_roleid(username) : get_roleid_checked(username);
}
/*
* Change foreign-data wrapper owner.
*
* Allow this only for superusers; also the new owner must be a
* superuser.
*/
void
AlterForeignDataWrapperOwner(const char *name, Oid newOwnerId)
{
HeapTuple tup;
Relation rel;
Oid fdwId;
Form_pg_foreign_data_wrapper form;
/* Must be a superuser to change a FDW owner */
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to change owner of foreign-data wrapper \"%s\"",
name),
errhint("Must be superuser to change owner of a foreign-data wrapper.")));
/* New owner must also be a superuser */
if (!superuser_arg(newOwnerId))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to change owner of foreign-data wrapper \"%s\"",
name),
errhint("The owner of a foreign-data wrapper must be a superuser.")));
rel = heap_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy(FOREIGNDATAWRAPPERNAME,
CStringGetDatum(name),
0, 0, 0);
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper \"%s\" does not exist", name)));
fdwId = HeapTupleGetOid(tup);
form = (Form_pg_foreign_data_wrapper) GETSTRUCT(tup);
if (form->fdwowner != newOwnerId)
{
form->fdwowner = newOwnerId;
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
/* Update owner dependency reference */
changeDependencyOnOwner(ForeignDataWrapperRelationId,
fdwId,
newOwnerId);
}
heap_close(rel, NoLock);
heap_freetuple(tup);
}
/*
* Change foreign server owner
*/
void
AlterForeignServerOwner(const char *name, Oid newOwnerId)
{
HeapTuple tup;
Relation rel;
Oid srvId;
AclResult aclresult;
Form_pg_foreign_server form;
rel = heap_open(ForeignServerRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy(FOREIGNSERVERNAME,
CStringGetDatum(name),
0, 0, 0);
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist", name)));
srvId = HeapTupleGetOid(tup);
form = (Form_pg_foreign_server) GETSTRUCT(tup);
if (form->srvowner != newOwnerId)
{
/* Superusers can always do it */
if (!superuser())
{
/* Must be owner */
if (!pg_foreign_server_ownercheck(srvId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
name);
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/* New owner must have USAGE privilege on foreign-data wrapper */
aclresult = pg_foreign_data_wrapper_aclcheck(form->srvfdw, newOwnerId, ACL_USAGE);
if (aclresult != ACLCHECK_OK)
{
ForeignDataWrapper *fdw = GetForeignDataWrapper(form->srvfdw);
aclcheck_error(aclresult, ACL_KIND_FDW, fdw->fdwname);
}
}
form->srvowner = newOwnerId;
simple_heap_update(rel, &tup->t_self, tup);
CatalogUpdateIndexes(rel, tup);
/* Update owner dependency reference */
changeDependencyOnOwner(ForeignServerRelationId, HeapTupleGetOid(tup),
newOwnerId);
}
heap_close(rel, NoLock);
heap_freetuple(tup);
}
/*
* Create a foreign-data wrapper
*/
void
CreateForeignDataWrapper(CreateFdwStmt *stmt)
{
Relation rel;
Datum values[Natts_pg_foreign_data_wrapper];
bool nulls[Natts_pg_foreign_data_wrapper];
HeapTuple tuple;
Oid fdwId;
Datum fdwoptions = InvalidOid;
Oid ownerId;
ForeignDataWrapperLibrary *fdwlib;
/* Must be super user */
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to create foreign-data wrapper \"%s\"",
stmt->fdwname),
errhint("Must be superuser to create a foreign-data wrapper.")));
/* For now the owner cannot be specified on create. Use effective user ID. */
ownerId = GetUserId();
/*
* Check that there is no other foreign-data wrapper by this name.
*/
if (GetForeignDataWrapperByName(stmt->fdwname, true) != NULL)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("foreign-data wrapper \"%s\" already exists",
stmt->fdwname)));
/*
* Insert tuple into pg_foreign_data_wrapper.
*/
rel = heap_open(ForeignDataWrapperRelationId, RowExclusiveLock);
MemSet(nulls, false, Natts_pg_foreign_data_wrapper);
values[Anum_pg_foreign_data_wrapper_fdwname - 1] =
DirectFunctionCall1(namein, CStringGetDatum(stmt->fdwname));
values[Anum_pg_foreign_data_wrapper_fdwowner - 1] = ObjectIdGetDatum(ownerId);
values[Anum_pg_foreign_data_wrapper_fdwlibrary - 1] = CStringGetTextDatum(stmt->library);
nulls[Anum_pg_foreign_data_wrapper_fdwacl - 1] = true;
/*
* See if the FDW library loads at all. We also might want to use it
* later for validating the options.
*/
fdwlib = GetForeignDataWrapperLibrary(stmt->library);
fdwoptions = transformGenericOptions(0, stmt->options, FdwOpt, NULL,
fdwlib->validateOptionList);
if (OidIsValid(fdwoptions))
values[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = fdwoptions;
else
nulls[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = true;
tuple = heap_form_tuple(rel->rd_att, values, nulls);
fdwId = simple_heap_insert(rel, tuple);
CatalogUpdateIndexes(rel, tuple);
heap_freetuple(tuple);
recordDependencyOnOwner(ForeignDataWrapperRelationId, fdwId, ownerId);
heap_close(rel, NoLock);
}
/*
* Alter foreign-data wrapper
*/
void
AlterForeignDataWrapper(AlterFdwStmt *stmt)
{
Relation rel;
HeapTuple tp;
Datum repl_val[Natts_pg_foreign_data_wrapper];
bool repl_null[Natts_pg_foreign_data_wrapper];
bool repl_repl[Natts_pg_foreign_data_wrapper];
Oid fdwId;
bool isnull;
Datum datum;
ForeignDataWrapperLibrary *fdwlib;
/* Must be super user */
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to alter foreign-data wrapper \"%s\"",
stmt->fdwname),
errhint("Must be superuser to alter a foreign-data wrapper.")));
tp = SearchSysCacheCopy(FOREIGNDATAWRAPPERNAME,
CStringGetDatum(stmt->fdwname),
0, 0, 0);
if (!HeapTupleIsValid(tp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper \"%s\" does not exist", stmt->fdwname)));
fdwId = HeapTupleGetOid(tp);
memset(repl_val, 0, sizeof(repl_val));
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
if (stmt->library)
{
/*
* New library specified -- load to see if valid.
*/
fdwlib = GetForeignDataWrapperLibrary(stmt->library);
repl_val[Anum_pg_foreign_data_wrapper_fdwlibrary - 1] = CStringGetTextDatum(stmt->library);
repl_repl[Anum_pg_foreign_data_wrapper_fdwlibrary - 1] = true;
/*
* It could be that the options for the FDW, SERVER and USER MAPPING
* are no longer valid with the new library. Warn about this.
*/
ereport(WARNING,
(errmsg("changing the foreign-data wrapper library can cause "
"the options for dependent objects to become invalid")));
}
else
{
/*
* No LIBRARY clause specified, but we need to load it for validating
* options.
*/
datum = SysCacheGetAttr(FOREIGNDATAWRAPPEROID,
tp,
Anum_pg_foreign_data_wrapper_fdwlibrary,
&isnull);
fdwlib = GetForeignDataWrapperLibrary(TextDatumGetCString(datum));
}
/*
* Options specified, validate and update.
*/
if (stmt->options)
{
/* Extract the current options */
datum = SysCacheGetAttr(FOREIGNDATAWRAPPEROID,
tp,
Anum_pg_foreign_data_wrapper_fdwoptions,
&isnull);
/* Transform the options */
datum = transformGenericOptions(datum, stmt->options, FdwOpt,
NULL, fdwlib->validateOptionList);
if (OidIsValid(datum))
repl_val[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = ObjectIdGetDatum(datum);
else
repl_null[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = true;
repl_repl[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = true;
}
/* Everything looks good - update the tuple */
rel = heap_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
simple_heap_update(rel, &tp->t_self, tp);
CatalogUpdateIndexes(rel, tp);
heap_close(rel, RowExclusiveLock);
heap_freetuple(tp);
}
/*
* Drop foreign-data wrapper
*/
void
RemoveForeignDataWrapper(DropFdwStmt *stmt)
{
Oid fdwId;
ObjectAddress object;
fdwId = GetForeignDataWrapperOidByName(stmt->fdwname, true);
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to drop foreign-data wrapper \"%s\"",
stmt->fdwname),
errhint("Must be superuser to drop a foreign-data wrapper.")));
if (!OidIsValid(fdwId))
{
if (!stmt->missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper \"%s\" does not exist",
stmt->fdwname)));
/* IF EXISTS specified, just note it */
ereport(NOTICE,
(errmsg("foreign-data wrapper \"%s\" does not exist, skipping",
stmt->fdwname)));
return;
}
/*
* Do the deletion
*/
object.classId = ForeignDataWrapperRelationId;
object.objectId = fdwId;
object.objectSubId = 0;
performDeletion(&object, stmt->behavior);
}
/*
* Drop foreign-data wrapper by OID
*/
void
RemoveForeignDataWrapperById(Oid fdwId)
{
HeapTuple tp;
Relation rel;
rel = heap_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tp = SearchSysCache(FOREIGNDATAWRAPPEROID,
ObjectIdGetDatum(fdwId),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for foreign-data wrapper %u", fdwId);
simple_heap_delete(rel, &tp->t_self);
ReleaseSysCache(tp);
heap_close(rel, RowExclusiveLock);
}
/*
* Create a foreign server
*/
void
CreateForeignServer(CreateForeignServerStmt *stmt)
{
Relation rel;
Datum srvoptions = InvalidOid;
Datum values[Natts_pg_foreign_server];
bool nulls[Natts_pg_foreign_server];
HeapTuple tuple;
Oid srvId;
Oid ownerId;
AclResult aclresult;
ObjectAddress myself;
ObjectAddress referenced;
ForeignDataWrapper *fdw;
/* For now the owner cannot be specified on create. Use effective user ID. */
ownerId = GetUserId();
/*
* Check that there is no other foreign server by this name.
*/
if (GetForeignServerByName(stmt->servername, true) != NULL)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("server \"%s\" already exists",
stmt->servername)));
/*
* Check that the FDW exists and that we have USAGE on it.
* Also get the actual FDW for option validation etc.
*/
fdw = GetForeignDataWrapperByName(stmt->fdwname, false);
aclresult = pg_foreign_data_wrapper_aclcheck(fdw->fdwid, ownerId, ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_FDW, fdw->fdwname);
/*
* Insert tuple into pg_foreign_server.
*/
rel = heap_open(ForeignServerRelationId, RowExclusiveLock);
MemSet(nulls, false, Natts_pg_foreign_server);
values[Anum_pg_foreign_server_srvname - 1] =
DirectFunctionCall1(namein, CStringGetDatum(stmt->servername));
values[Anum_pg_foreign_server_srvowner - 1] = ObjectIdGetDatum(ownerId);
values[Anum_pg_foreign_server_srvfdw - 1] = ObjectIdGetDatum(fdw->fdwid);
/* Add server type if supplied */
if (stmt->servertype)
values[Anum_pg_foreign_server_srvtype - 1] =
CStringGetTextDatum(stmt->servertype);
else
nulls[Anum_pg_foreign_server_srvtype - 1] = true;
/* Add server version if supplied */
if (stmt->version)
values[Anum_pg_foreign_server_srvversion - 1] =
CStringGetTextDatum(stmt->version);
else
nulls[Anum_pg_foreign_server_srvversion - 1] = true;
/* Start with a blank acl */
nulls[Anum_pg_foreign_server_srvacl - 1] = true;
/* Add server options */
srvoptions = transformGenericOptions(0, stmt->options, ServerOpt, fdw,
fdw->lib->validateOptionList);
if (OidIsValid(srvoptions))
values[Anum_pg_foreign_server_srvoptions - 1] = srvoptions;
else
nulls[Anum_pg_foreign_server_srvoptions - 1] = true;
tuple = heap_form_tuple(rel->rd_att, values, nulls);
srvId = simple_heap_insert(rel, tuple);
CatalogUpdateIndexes(rel, tuple);
heap_freetuple(tuple);
/* Add dependency on FDW and owner */
myself.classId = ForeignServerRelationId;
myself.objectId = srvId;
myself.objectSubId = 0;
referenced.classId = ForeignDataWrapperRelationId;
referenced.objectId = fdw->fdwid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
recordDependencyOnOwner(ForeignServerRelationId, srvId, ownerId);
heap_close(rel, NoLock);
}
/*
* Alter foreign server
*/
void
AlterForeignServer(AlterForeignServerStmt *stmt)
{
Relation rel;
HeapTuple tp;
Datum repl_val[Natts_pg_foreign_server];
bool repl_null[Natts_pg_foreign_server];
bool repl_repl[Natts_pg_foreign_server];
Oid srvId;
Form_pg_foreign_server srvForm;
tp = SearchSysCacheCopy(FOREIGNSERVERNAME,
CStringGetDatum(stmt->servername),
0, 0, 0);
if (!HeapTupleIsValid(tp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist", stmt->servername)));
srvId = HeapTupleGetOid(tp);
srvForm = (Form_pg_foreign_server) GETSTRUCT(tp);
/*
* Only owner or a superuser can ALTER a SERVER.
*/
if (!pg_foreign_server_ownercheck(srvId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
stmt->servername);
memset(repl_val, 0, sizeof(repl_val));
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
if (stmt->has_version)
{
/*
* Change the server VERSION string.
*/
if (stmt->version)
repl_val[Anum_pg_foreign_server_srvversion - 1] =
CStringGetTextDatum(stmt->version);
else
repl_null[Anum_pg_foreign_server_srvversion - 1] = true;
repl_repl[Anum_pg_foreign_server_srvversion - 1] = true;
}
if (stmt->options)
{
ForeignDataWrapper *fdw = GetForeignDataWrapper(srvForm->srvfdw);
Datum datum;
bool isnull;
/* Extract the current srvoptions */
datum = SysCacheGetAttr(FOREIGNSERVEROID,
tp,
Anum_pg_foreign_server_srvoptions,
&isnull);
/* Prepare the options array */
datum = transformGenericOptions(datum, stmt->options, ServerOpt,
fdw, fdw->lib->validateOptionList);
if (OidIsValid(datum))
repl_val[Anum_pg_foreign_server_srvoptions - 1] = datum;
else
repl_null[Anum_pg_foreign_server_srvoptions - 1] = true;
repl_repl[Anum_pg_foreign_server_srvoptions - 1] = true;
}
/* Everything looks good - update the tuple */
rel = heap_open(ForeignServerRelationId, RowExclusiveLock);
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
simple_heap_update(rel, &tp->t_self, tp);
CatalogUpdateIndexes(rel, tp);
heap_close(rel, RowExclusiveLock);
heap_freetuple(tp);
}
/*
* Drop foreign server
*/
void
RemoveForeignServer(DropForeignServerStmt *stmt)
{
Oid srvId;
ObjectAddress object;
srvId = GetForeignServerOidByName(stmt->servername, true);
if (!OidIsValid(srvId))
{
/* Server not found, complain or notice */
if (!stmt->missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist", stmt->servername)));
/* IF EXISTS specified, just note it */
ereport(NOTICE,
(errmsg("server \"%s\" does not exist, skipping",
stmt->servername)));
return;
}
/* Only allow DROP if the server is owned by the user. */
if (!pg_foreign_server_ownercheck(srvId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
stmt->servername);
object.classId = ForeignServerRelationId;
object.objectId = srvId;
object.objectSubId = 0;
performDeletion(&object, stmt->behavior);
}
/*
* Drop foreign server by OID
*/
void
RemoveForeignServerById(Oid srvId)
{
HeapTuple tp;
Relation rel;
rel = heap_open(ForeignServerRelationId, RowExclusiveLock);
tp = SearchSysCache(FOREIGNSERVEROID,
ObjectIdGetDatum(srvId),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for foreign server %u", srvId);
simple_heap_delete(rel, &tp->t_self);
ReleaseSysCache(tp);
heap_close(rel, RowExclusiveLock);
}
/*
* Create user mapping
*/
void
CreateUserMapping(CreateUserMappingStmt *stmt)
{
Relation rel;
Datum useoptions = InvalidOid;
Datum values[Natts_pg_user_mapping];
bool nulls[Natts_pg_user_mapping];
HeapTuple tuple;
Oid useId;
Oid umId;
Oid ownerId;
ObjectAddress myself;
ObjectAddress referenced;
ForeignServer *srv;
ForeignDataWrapper *fdw;
ownerId = GetUserId();
useId = GetUserOidFromMapping(stmt->username, false);
/*
* Check that the server exists and that the we own it.
*/
srv = GetForeignServerByName(stmt->servername, false);
if (!pg_foreign_server_ownercheck(srv->serverid, ownerId))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
stmt->servername);
/*
* Check that the user mapping is unique within server.
*/
umId = GetSysCacheOid(USERMAPPINGUSERSERVER,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid),
0, 0);
if (OidIsValid(umId))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("user mapping \"%s\" already exists for server %s",
MappingUserName(useId),
stmt->servername)));
fdw = GetForeignDataWrapper(srv->fdwid);
/*
* Insert tuple into pg_user_mapping.
*/
rel = heap_open(UserMappingRelationId, RowExclusiveLock);
MemSet(nulls, false, Natts_pg_user_mapping);
values[Anum_pg_user_mapping_umuser - 1] = ObjectIdGetDatum(useId);
values[Anum_pg_user_mapping_umserver - 1] = ObjectIdGetDatum(srv->serverid);
/* Add user options */
useoptions = transformGenericOptions(0, stmt->options, UserMappingOpt,
fdw, fdw->lib->validateOptionList);
if (OidIsValid(useoptions))
values[Anum_pg_user_mapping_umoptions - 1] = useoptions;
else
nulls[Anum_pg_user_mapping_umoptions - 1] = true;
tuple = heap_form_tuple(rel->rd_att, values, nulls);
umId = simple_heap_insert(rel, tuple);
CatalogUpdateIndexes(rel, tuple);
heap_freetuple(tuple);
/* Add dependency on the server */
myself.classId = UserMappingRelationId;
myself.objectId = umId;
myself.objectSubId = 0;
referenced.classId = ForeignServerRelationId;
referenced.objectId = srv->serverid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
if (OidIsValid(useId))
/* Record the mapped user dependency */
recordDependencyOnOwner(UserMappingRelationId, umId, useId);
heap_close(rel, NoLock);
}
/*
* Alter user mapping
*/
void
AlterUserMapping(AlterUserMappingStmt *stmt)
{
Relation rel;
HeapTuple tp;
Datum repl_val[Natts_pg_user_mapping];
bool repl_null[Natts_pg_user_mapping];
bool repl_repl[Natts_pg_user_mapping];
Oid useId;
Oid umId;
ForeignServer *srv;
useId = GetUserOidFromMapping(stmt->username, false);
srv = GetForeignServerByName(stmt->servername, false);
umId = GetSysCacheOid(USERMAPPINGUSERSERVER,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid),
0, 0);
if (!OidIsValid(umId))
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("user mapping \"%s\" does not exist for the server",
MappingUserName(useId))));
}
/*
* Must be owner of the server to alter user mapping.
*/
if (!pg_foreign_server_ownercheck(srv->serverid, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
stmt->servername);
tp = SearchSysCacheCopy(USERMAPPINGOID,
ObjectIdGetDatum(umId),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for user mapping %u", umId);
memset(repl_val, 0, sizeof(repl_val));
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
if (stmt->options)
{
ForeignDataWrapper *fdw;
Datum datum;
bool isnull;
/*
* Process the options.
*/
fdw = GetForeignDataWrapper(srv->fdwid);
datum = SysCacheGetAttr(USERMAPPINGUSERSERVER,
tp,
Anum_pg_user_mapping_umoptions,
&isnull);
/* Prepare the options array */
datum = transformGenericOptions(datum, stmt->options, UserMappingOpt,
fdw, fdw->lib->validateOptionList);
if (OidIsValid(datum))
repl_val[Anum_pg_user_mapping_umoptions - 1] = datum;
else
repl_null[Anum_pg_user_mapping_umoptions - 1] = true;
repl_repl[Anum_pg_user_mapping_umoptions - 1] = true;
}
/* Everything looks good - update the tuple */
rel = heap_open(UserMappingRelationId, RowExclusiveLock);
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
simple_heap_update(rel, &tp->t_self, tp);
CatalogUpdateIndexes(rel, tp);
heap_close(rel, RowExclusiveLock);
heap_freetuple(tp);
}
/*
* Drop user mapping
*/
void
RemoveUserMapping(DropUserMappingStmt *stmt)
{
ObjectAddress object;
Oid useId;
Oid umId;
ForeignServer *srv;
useId = GetUserOidFromMapping(stmt->username, stmt->missing_ok);
srv = GetForeignServerByName(stmt->servername, true);
if (stmt->username && !OidIsValid(useId))
{
/*
* IF EXISTS specified, role not found and not public.
* Notice this and leave.
*/
elog(NOTICE, "role \"%s\" does not exist, skipping", stmt->username);
return;
}
if (!srv)
{
if (!stmt->missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist",
stmt->servername)));
/* IF EXISTS, just note it */
ereport(NOTICE, (errmsg("server does not exist, skipping")));
return;
}
umId = GetSysCacheOid(USERMAPPINGUSERSERVER,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid),
0, 0);
if (!OidIsValid(umId))
{
if (!stmt->missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("user mapping \"%s\" does not exist for the server",
MappingUserName(useId))));
/* IF EXISTS specified, just note it */
ereport(NOTICE,
(errmsg("user mapping \"%s\" does not exist for the server, skipping",
MappingUserName(useId))));
return;
}
/*
* Only allow DROP if we own the server.
*/
if (!pg_foreign_server_ownercheck(srv->serverid, GetUserId()))
{
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_FOREIGN_SERVER,
srv->servername);
}
/*
* Do the deletion
*/
object.classId = UserMappingRelationId;
object.objectId = umId;
object.objectSubId = 0;
performDeletion(&object, DROP_CASCADE);
}
/*
* Drop user mapping by OID. This is called to clean up dependencies.
*/
void
RemoveUserMappingById(Oid umId)
{
HeapTuple tp;
Relation rel;
rel = heap_open(UserMappingRelationId, RowExclusiveLock);
tp = SearchSysCache(USERMAPPINGOID,
ObjectIdGetDatum(umId),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for user mapping %u", umId);
simple_heap_delete(rel, &tp->t_self);
ReleaseSysCache(tp);
heap_close(rel, RowExclusiveLock);
}