greenplumn foreigncmds 源码
greenplumn foreigncmds 代码
文件路径：/src/backend/commands/foreigncmds.c
/*-------------------------------------------------------------------------
*
* foreigncmds.c
* foreign-data wrapper/server creation/manipulation commands
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/backend/commands/foreigncmds.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "access/reloptions.h"
#include "access/table.h"
#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
#include "catalog/oid_dispatch.h"
#include "catalog/pg_foreign_data_wrapper.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "catalog/pg_user_mapping.h"
#include "cdb/cdbdisp_query.h"
#include "cdb/cdbdispatchresult.h"
#include "cdb/cdbvars.h"
#include "commands/defrem.h"
#include "foreign/fdwapi.h"
#include "foreign/foreign.h"
#include "miscadmin.h"
#include "parser/parse_func.h"
#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "catalog/oid_dispatch.h"
typedef struct
{
char *tablename;
char *cmd;
} import_error_callback_arg;
/* Internal functions */
static void import_error_callback(void *arg);
/*
* Convert a DefElem list to the text array format that is used in
* pg_foreign_data_wrapper, pg_foreign_server, pg_user_mapping, and
* pg_foreign_table.
*
* Returns the array in the form of a Datum, or PointerGetDatum(NULL)
* if the list is empty.
*
* 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;
foreach(cell, options)
{
DefElem *def = lfirst(cell);
const char *value;
Size len;
text *t;
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 a list of DefElem into text array format. This is substantially
* the same thing as optionListToArray(), except we recognize SET/ADD/DROP
* actions for modifying an existing list of options, which is passed in
* Datum form as oldOptions. Also, if fdwvalidator isn't InvalidOid
* it specifies a validator function to call on the result.
*
* Returns the array in the form of a Datum, or PointerGetDatum(NULL)
* if the list is empty.
*
* This is used by CREATE/ALTER of FOREIGN DATA WRAPPER/SERVER/USER MAPPING/
* FOREIGN TABLE.
*/
Datum
transformGenericOptions(Oid catalogId,
Datum oldOptions,
List *options,
Oid fdwvalidator)
{
List *resultOptions = untransformRelOptions(oldOptions);
ListCell *optcell;
Datum result;
foreach(optcell, options)
{
DefElem *od = lfirst(optcell);
ListCell *cell;
ListCell *prev = NULL;
/*
* Find the element in resultOptions. We need this for validation in
* all cases. Also identify the previous element.
*/
foreach(cell, resultOptions)
{
DefElem *def = lfirst(cell);
if (strcmp(def->defname, od->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. Note that an unspecified action is taken to be
* ADD.
*/
switch (od->defaction)
{
case DEFELEM_DROP:
if (!cell)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("option \"%s\" not found",
od->defname)));
resultOptions = list_delete_cell(resultOptions, cell, prev);
break;
case DEFELEM_SET:
if (!cell)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("option \"%s\" not found",
od->defname)));
lfirst(cell) = od;
break;
case DEFELEM_ADD:
case DEFELEM_UNSPEC:
if (cell)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("option \"%s\" provided more than once",
od->defname)));
resultOptions = lappend(resultOptions, od);
break;
default:
elog(ERROR, "unrecognized action %d on option \"%s\"",
(int) od->defaction, od->defname);
break;
}
}
result = optionListToArray(resultOptions);
/*
* Check and separate out the extra options, fdwvalidator doesn't have
* to handle it. USER MAPPING doesn't have the mpp_execute option.
*/
if (catalogId != UserMappingRelationId)
{
SeparateOutMppExecute(&resultOptions);
}
if (OidIsValid(fdwvalidator))
{
Datum valarg = optionListToArray(resultOptions);
/*
* Pass a null options list as an empty array, so that validators
* don't have to be declared non-strict to handle the case.
*/
if (DatumGetPointer(valarg) == NULL)
valarg = PointerGetDatum(construct_empty_array(TEXTOID));
OidFunctionCall2(fdwvalidator, valarg, ObjectIdGetDatum(catalogId));
}
return result;
}
/*
* Internal workhorse for changing a data wrapper's owner.
*
* Allow this only for superusers; also the new owner must be a
* superuser.
*/
static void
AlterForeignDataWrapperOwner_internal(Relation rel, HeapTuple tup, Oid newOwnerId)
{
Form_pg_foreign_data_wrapper form;
Datum repl_val[Natts_pg_foreign_data_wrapper];
bool repl_null[Natts_pg_foreign_data_wrapper];
bool repl_repl[Natts_pg_foreign_data_wrapper];
Acl *newAcl;
Datum aclDatum;
bool isNull;
form = (Form_pg_foreign_data_wrapper) GETSTRUCT(tup);
/* 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\"",
NameStr(form->fdwname)),
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\"",
NameStr(form->fdwname)),
errhint("The owner of a foreign-data wrapper must be a superuser.")));
if (form->fdwowner != newOwnerId)
{
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
repl_repl[Anum_pg_foreign_data_wrapper_fdwowner - 1] = true;
repl_val[Anum_pg_foreign_data_wrapper_fdwowner - 1] = ObjectIdGetDatum(newOwnerId);
aclDatum = heap_getattr(tup,
Anum_pg_foreign_data_wrapper_fdwacl,
RelationGetDescr(rel),
&isNull);
/* Null ACLs do not require changes */
if (!isNull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
form->fdwowner, newOwnerId);
repl_repl[Anum_pg_foreign_data_wrapper_fdwacl - 1] = true;
repl_val[Anum_pg_foreign_data_wrapper_fdwacl - 1] = PointerGetDatum(newAcl);
}
tup = heap_modify_tuple(tup, RelationGetDescr(rel), repl_val, repl_null,
repl_repl);
CatalogTupleUpdate(rel, &tup->t_self, tup);
/* Update owner dependency reference */
changeDependencyOnOwner(ForeignDataWrapperRelationId,
form->oid,
newOwnerId);
}
InvokeObjectPostAlterHook(ForeignDataWrapperRelationId,
form->oid, 0);
}
/*
* Change foreign-data wrapper owner -- by name
*
* Note restrictions in the "_internal" function, above.
*/
ObjectAddress
AlterForeignDataWrapperOwner(const char *name, Oid newOwnerId)
{
Oid fdwId;
HeapTuple tup;
Relation rel;
ObjectAddress address;
Form_pg_foreign_data_wrapper form;
rel = table_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy1(FOREIGNDATAWRAPPERNAME, CStringGetDatum(name));
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper \"%s\" does not exist", name)));
form = (Form_pg_foreign_data_wrapper) GETSTRUCT(tup);
fdwId = form->oid;
AlterForeignDataWrapperOwner_internal(rel, tup, newOwnerId);
ObjectAddressSet(address, ForeignDataWrapperRelationId, fdwId);
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
return address;
}
/*
* Change foreign-data wrapper owner -- by OID
*
* Note restrictions in the "_internal" function, above.
*/
void
AlterForeignDataWrapperOwner_oid(Oid fwdId, Oid newOwnerId)
{
HeapTuple tup;
Relation rel;
rel = table_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy1(FOREIGNDATAWRAPPEROID, ObjectIdGetDatum(fwdId));
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper with OID %u does not exist", fwdId)));
AlterForeignDataWrapperOwner_internal(rel, tup, newOwnerId);
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
}
/*
* Internal workhorse for changing a foreign server's owner
*/
static void
AlterForeignServerOwner_internal(Relation rel, HeapTuple tup, Oid newOwnerId)
{
Form_pg_foreign_server form;
Datum repl_val[Natts_pg_foreign_server];
bool repl_null[Natts_pg_foreign_server];
bool repl_repl[Natts_pg_foreign_server];
Acl *newAcl;
Datum aclDatum;
bool isNull;
form = (Form_pg_foreign_server) GETSTRUCT(tup);
if (form->srvowner != newOwnerId)
{
/* Superusers can always do it */
if (!superuser())
{
Oid srvId;
AclResult aclresult;
srvId = form->oid;
/* Must be owner */
if (!pg_foreign_server_ownercheck(srvId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_FOREIGN_SERVER,
NameStr(form->srvname));
/* 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, OBJECT_FDW, fdw->fdwname);
}
}
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
repl_repl[Anum_pg_foreign_server_srvowner - 1] = true;
repl_val[Anum_pg_foreign_server_srvowner - 1] = ObjectIdGetDatum(newOwnerId);
aclDatum = heap_getattr(tup,
Anum_pg_foreign_server_srvacl,
RelationGetDescr(rel),
&isNull);
/* Null ACLs do not require changes */
if (!isNull)
{
newAcl = aclnewowner(DatumGetAclP(aclDatum),
form->srvowner, newOwnerId);
repl_repl[Anum_pg_foreign_server_srvacl - 1] = true;
repl_val[Anum_pg_foreign_server_srvacl - 1] = PointerGetDatum(newAcl);
}
tup = heap_modify_tuple(tup, RelationGetDescr(rel), repl_val, repl_null,
repl_repl);
CatalogTupleUpdate(rel, &tup->t_self, tup);
/* Update owner dependency reference */
changeDependencyOnOwner(ForeignServerRelationId, form->oid,
newOwnerId);
}
InvokeObjectPostAlterHook(ForeignServerRelationId,
form->oid, 0);
}
/*
* Change foreign server owner -- by name
*/
ObjectAddress
AlterForeignServerOwner(const char *name, Oid newOwnerId)
{
Oid servOid;
HeapTuple tup;
Relation rel;
ObjectAddress address;
Form_pg_foreign_server form;
rel = table_open(ForeignServerRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy1(FOREIGNSERVERNAME, CStringGetDatum(name));
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist", name)));
form = (Form_pg_foreign_server) GETSTRUCT(tup);
servOid = form->oid;
AlterForeignServerOwner_internal(rel, tup, newOwnerId);
ObjectAddressSet(address, ForeignServerRelationId, servOid);
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
return address;
}
/*
* Change foreign server owner -- by OID
*/
void
AlterForeignServerOwner_oid(Oid srvId, Oid newOwnerId)
{
HeapTuple tup;
Relation rel;
rel = table_open(ForeignServerRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy1(FOREIGNSERVEROID, ObjectIdGetDatum(srvId));
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign server with OID %u does not exist", srvId)));
AlterForeignServerOwner_internal(rel, tup, newOwnerId);
heap_freetuple(tup);
table_close(rel, RowExclusiveLock);
}
/*
* Convert a handler function name passed from the parser to an Oid.
*/
static Oid
lookup_fdw_handler_func(DefElem *handler)
{
Oid handlerOid;
if (handler == NULL || handler->arg == NULL)
return InvalidOid;
/* handlers have no arguments */
handlerOid = LookupFuncName((List *) handler->arg, 0, NULL, false);
/* check that handler has correct return type */
if (get_func_rettype(handlerOid) != FDW_HANDLEROID)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("function %s must return type %s",
NameListToString((List *) handler->arg), "fdw_handler")));
return handlerOid;
}
/*
* Convert a validator function name passed from the parser to an Oid.
*/
static Oid
lookup_fdw_validator_func(DefElem *validator)
{
Oid funcargtypes[2];
if (validator == NULL || validator->arg == NULL)
return InvalidOid;
/* validators take text[], oid */
funcargtypes[0] = TEXTARRAYOID;
funcargtypes[1] = OIDOID;
return LookupFuncName((List *) validator->arg, 2, funcargtypes, false);
/* validator's return value is ignored, so we don't check the type */
}
/*
* Process function options of CREATE/ALTER FDW
*/
static void
parse_func_options(List *func_options,
bool *handler_given, Oid *fdwhandler,
bool *validator_given, Oid *fdwvalidator)
{
ListCell *cell;
*handler_given = false;
*validator_given = false;
/* return InvalidOid if not given */
*fdwhandler = InvalidOid;
*fdwvalidator = InvalidOid;
foreach(cell, func_options)
{
DefElem *def = (DefElem *) lfirst(cell);
if (strcmp(def->defname, "handler") == 0)
{
if (*handler_given)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
*handler_given = true;
*fdwhandler = lookup_fdw_handler_func(def);
}
else if (strcmp(def->defname, "validator") == 0)
{
if (*validator_given)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
*validator_given = true;
*fdwvalidator = lookup_fdw_validator_func(def);
}
else
elog(ERROR, "option \"%s\" not recognized",
def->defname);
}
}
/*
* Create a foreign-data wrapper
*/
ObjectAddress
CreateForeignDataWrapper(CreateFdwStmt *stmt)
{
Relation rel;
Datum values[Natts_pg_foreign_data_wrapper];
bool nulls[Natts_pg_foreign_data_wrapper];
HeapTuple tuple;
Oid fdwId;
bool handler_given;
bool validator_given;
Oid fdwhandler;
Oid fdwvalidator;
Datum fdwoptions;
Oid ownerId;
ObjectAddress myself;
ObjectAddress referenced;
rel = table_open(ForeignDataWrapperRelationId, RowExclusiveLock);
/* 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.
*/
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
fdwId = GetNewOidForForeignDataWrapper(rel, ForeignDataWrapperOidIndexId,
Anum_pg_foreign_data_wrapper_oid,
stmt->fdwname);
values[Anum_pg_foreign_data_wrapper_oid - 1] = ObjectIdGetDatum(fdwId);
values[Anum_pg_foreign_data_wrapper_fdwname - 1] =
DirectFunctionCall1(namein, CStringGetDatum(stmt->fdwname));
values[Anum_pg_foreign_data_wrapper_fdwowner - 1] = ObjectIdGetDatum(ownerId);
/* Lookup handler and validator functions, if given */
parse_func_options(stmt->func_options,
&handler_given, &fdwhandler,
&validator_given, &fdwvalidator);
values[Anum_pg_foreign_data_wrapper_fdwhandler - 1] = ObjectIdGetDatum(fdwhandler);
values[Anum_pg_foreign_data_wrapper_fdwvalidator - 1] = ObjectIdGetDatum(fdwvalidator);
nulls[Anum_pg_foreign_data_wrapper_fdwacl - 1] = true;
fdwoptions = transformGenericOptions(ForeignDataWrapperRelationId,
PointerGetDatum(NULL),
stmt->options,
fdwvalidator);
if (PointerIsValid(DatumGetPointer(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);
CatalogTupleInsert(rel, tuple);
heap_freetuple(tuple);
/* record dependencies */
myself.classId = ForeignDataWrapperRelationId;
myself.objectId = fdwId;
myself.objectSubId = 0;
if (OidIsValid(fdwhandler))
{
referenced.classId = ProcedureRelationId;
referenced.objectId = fdwhandler;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
if (OidIsValid(fdwvalidator))
{
referenced.classId = ProcedureRelationId;
referenced.objectId = fdwvalidator;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
recordDependencyOnOwner(ForeignDataWrapperRelationId, fdwId, ownerId);
/* dependency on extension */
recordDependencyOnCurrentExtension(&myself, false);
/* Post creation hook for new foreign data wrapper */
InvokeObjectPostCreateHook(ForeignDataWrapperRelationId, fdwId, 0);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
table_close(rel, RowExclusiveLock);
return myself;
}
/*
* Alter foreign-data wrapper
*/
ObjectAddress
AlterForeignDataWrapper(AlterFdwStmt *stmt)
{
Relation rel;
HeapTuple tp;
Form_pg_foreign_data_wrapper fdwForm;
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;
bool handler_given;
bool validator_given;
Oid fdwhandler;
Oid fdwvalidator;
ObjectAddress myself;
rel = table_open(ForeignDataWrapperRelationId, RowExclusiveLock);
/* 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 = SearchSysCacheCopy1(FOREIGNDATAWRAPPERNAME,
CStringGetDatum(stmt->fdwname));
if (!HeapTupleIsValid(tp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("foreign-data wrapper \"%s\" does not exist", stmt->fdwname)));
fdwForm = (Form_pg_foreign_data_wrapper) GETSTRUCT(tp);
fdwId = fdwForm->oid;
memset(repl_val, 0, sizeof(repl_val));
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
parse_func_options(stmt->func_options,
&handler_given, &fdwhandler,
&validator_given, &fdwvalidator);
if (handler_given)
{
repl_val[Anum_pg_foreign_data_wrapper_fdwhandler - 1] = ObjectIdGetDatum(fdwhandler);
repl_repl[Anum_pg_foreign_data_wrapper_fdwhandler - 1] = true;
/*
* It could be that the behavior of accessing foreign table changes
* with the new handler. Warn about this.
*/
ereport(WARNING,
(errmsg("changing the foreign-data wrapper handler can change behavior of existing foreign tables")));
}
if (validator_given)
{
repl_val[Anum_pg_foreign_data_wrapper_fdwvalidator - 1] = ObjectIdGetDatum(fdwvalidator);
repl_repl[Anum_pg_foreign_data_wrapper_fdwvalidator - 1] = true;
/*
* It could be that existing options for the FDW or dependent SERVER,
* USER MAPPING or FOREIGN TABLE objects are no longer valid according
* to the new validator. Warn about this.
*/
if (OidIsValid(fdwvalidator))
ereport(WARNING,
(errmsg("changing the foreign-data wrapper validator can cause "
"the options for dependent objects to become invalid")));
}
else
{
/*
* Validator is not changed, but we need it for validating options.
*/
fdwvalidator = fdwForm->fdwvalidator;
}
/*
* If options specified, validate and update.
*/
if (stmt->options)
{
/* Extract the current options */
datum = SysCacheGetAttr(FOREIGNDATAWRAPPEROID,
tp,
Anum_pg_foreign_data_wrapper_fdwoptions,
&isnull);
if (isnull)
datum = PointerGetDatum(NULL);
/* Transform the options */
datum = transformGenericOptions(ForeignDataWrapperRelationId,
datum,
stmt->options,
fdwvalidator);
if (PointerIsValid(DatumGetPointer(datum)))
repl_val[Anum_pg_foreign_data_wrapper_fdwoptions - 1] = 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 */
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
CatalogTupleUpdate(rel, &tp->t_self, tp);
heap_freetuple(tp);
ObjectAddressSet(myself, ForeignDataWrapperRelationId, fdwId);
/* Update function dependencies if we changed them */
if (handler_given || validator_given)
{
ObjectAddress referenced;
/*
* Flush all existing dependency records of this FDW on functions; we
* assume there can be none other than the ones we are fixing.
*/
deleteDependencyRecordsForClass(ForeignDataWrapperRelationId,
fdwId,
ProcedureRelationId,
DEPENDENCY_NORMAL);
/* And build new ones. */
if (OidIsValid(fdwhandler))
{
referenced.classId = ProcedureRelationId;
referenced.objectId = fdwhandler;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
if (OidIsValid(fdwvalidator))
{
referenced.classId = ProcedureRelationId;
referenced.objectId = fdwvalidator;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
InvokeObjectPostAlterHook(ForeignDataWrapperRelationId, fdwId, 0);
table_close(rel, RowExclusiveLock);
return myself;
}
/*
* Drop foreign-data wrapper by OID
*/
void
RemoveForeignDataWrapperById(Oid fdwId)
{
HeapTuple tp;
Relation rel;
rel = table_open(ForeignDataWrapperRelationId, RowExclusiveLock);
tp = SearchSysCache1(FOREIGNDATAWRAPPEROID, ObjectIdGetDatum(fdwId));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for foreign-data wrapper %u", fdwId);
CatalogTupleDelete(rel, &tp->t_self);
ReleaseSysCache(tp);
table_close(rel, RowExclusiveLock);
}
/*
* Create a foreign server
*/
ObjectAddress
CreateForeignServer(CreateForeignServerStmt *stmt)
{
Relation rel;
Datum srvoptions;
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;
rel = table_open(ForeignServerRelationId, RowExclusiveLock);
/* 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. Do nothing if
* IF NOT EXISTS was enforced.
*/
if (GetForeignServerByName(stmt->servername, true) != NULL)
{
if (stmt->if_not_exists)
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("server \"%s\" already exists, skipping",
stmt->servername)));
table_close(rel, RowExclusiveLock);
return InvalidObjectAddress;
}
else
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, OBJECT_FDW, fdw->fdwname);
/*
* Insert tuple into pg_foreign_server.
*/
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
srvId = GetNewOidForForeignServer(rel, ForeignServerOidIndexId,
Anum_pg_foreign_server_oid,
stmt->servername);
values[Anum_pg_foreign_server_oid - 1] = ObjectIdGetDatum(srvId);
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(ForeignServerRelationId,
PointerGetDatum(NULL),
stmt->options,
fdw->fdwvalidator);
if (PointerIsValid(DatumGetPointer(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);
CatalogTupleInsert(rel, tuple);
heap_freetuple(tuple);
/* record dependencies */
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);
/* dependency on extension */
recordDependencyOnCurrentExtension(&myself, false);
/* Post creation hook for new foreign server */
InvokeObjectPostCreateHook(ForeignServerRelationId, srvId, 0);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
table_close(rel, RowExclusiveLock);
return myself;
}
/*
* Alter foreign server
*/
ObjectAddress
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;
ObjectAddress address;
rel = table_open(ForeignServerRelationId, RowExclusiveLock);
tp = SearchSysCacheCopy1(FOREIGNSERVERNAME,
CStringGetDatum(stmt->servername));
if (!HeapTupleIsValid(tp))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("server \"%s\" does not exist", stmt->servername)));
srvForm = (Form_pg_foreign_server) GETSTRUCT(tp);
srvId = srvForm->oid;
/*
* Only owner or a superuser can ALTER a SERVER.
*/
if (!pg_foreign_server_ownercheck(srvId, GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_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);
if (isnull)
datum = PointerGetDatum(NULL);
/* Prepare the options array */
datum = transformGenericOptions(ForeignServerRelationId,
datum,
stmt->options,
fdw->fdwvalidator);
if (PointerIsValid(DatumGetPointer(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 */
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
CatalogTupleUpdate(rel, &tp->t_self, tp);
InvokeObjectPostAlterHook(ForeignServerRelationId, srvId, 0);
ObjectAddressSet(address, ForeignServerRelationId, srvId);
heap_freetuple(tp);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
table_close(rel, RowExclusiveLock);
return address;
}
/*
* Drop foreign server by OID
*/
void
RemoveForeignServerById(Oid srvId)
{
HeapTuple tp;
Relation rel;
rel = table_open(ForeignServerRelationId, RowExclusiveLock);
tp = SearchSysCache1(FOREIGNSERVEROID, ObjectIdGetDatum(srvId));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for foreign server %u", srvId);
CatalogTupleDelete(rel, &tp->t_self);
ReleaseSysCache(tp);
table_close(rel, RowExclusiveLock);
}
/*
* Common routine to check permission for user-mapping-related DDL
* commands. We allow server owners to operate on any mapping, and
* users to operate on their own mapping.
*/
static void
user_mapping_ddl_aclcheck(Oid umuserid, Oid serverid, const char *servername)
{
Oid curuserid = GetUserId();
if (!pg_foreign_server_ownercheck(serverid, curuserid))
{
if (umuserid == curuserid)
{
AclResult aclresult;
aclresult = pg_foreign_server_aclcheck(serverid, curuserid, ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, OBJECT_FOREIGN_SERVER, servername);
}
else
aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_FOREIGN_SERVER,
servername);
}
}
/*
* Create user mapping
*/
ObjectAddress
CreateUserMapping(CreateUserMappingStmt *stmt)
{
Relation rel;
Datum useoptions;
Datum values[Natts_pg_user_mapping];
bool nulls[Natts_pg_user_mapping];
HeapTuple tuple;
Oid useId;
Oid umId;
ObjectAddress myself;
ObjectAddress referenced;
ForeignServer *srv;
ForeignDataWrapper *fdw;
RoleSpec *role = (RoleSpec *) stmt->user;
rel = table_open(UserMappingRelationId, RowExclusiveLock);
if (role->roletype == ROLESPEC_PUBLIC)
useId = ACL_ID_PUBLIC;
else
useId = get_rolespec_oid(stmt->user, false);
/* Check that the server exists. */
srv = GetForeignServerByName(stmt->servername, false);
user_mapping_ddl_aclcheck(useId, srv->serverid, stmt->servername);
/*
* Check that the user mapping is unique within server.
*/
umId = GetSysCacheOid2(USERMAPPINGUSERSERVER, Anum_pg_user_mapping_oid,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid));
if (OidIsValid(umId))
{
if (stmt->if_not_exists)
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("user mapping for \"%s\" already exists for server \"%s\", skipping",
MappingUserName(useId),
stmt->servername)));
table_close(rel, RowExclusiveLock);
return InvalidObjectAddress;
}
else
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("user mapping for \"%s\" already exists for server \"%s\"",
MappingUserName(useId),
stmt->servername)));
}
fdw = GetForeignDataWrapper(srv->fdwid);
/*
* Insert tuple into pg_user_mapping.
*/
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
umId = GetNewOidForUserMapping(rel, UserMappingOidIndexId,
Anum_pg_user_mapping_oid,
useId, srv->serverid);
values[Anum_pg_user_mapping_oid - 1] = ObjectIdGetDatum(umId);
values[Anum_pg_user_mapping_umuser - 1] = ObjectIdGetDatum(useId);
values[Anum_pg_user_mapping_umserver - 1] = ObjectIdGetDatum(srv->serverid);
/* Add user options */
useoptions = transformGenericOptions(UserMappingRelationId,
PointerGetDatum(NULL),
stmt->options,
fdw->fdwvalidator);
if (PointerIsValid(DatumGetPointer(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);
CatalogTupleInsert(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);
}
/*
* Perhaps someday there should be a recordDependencyOnCurrentExtension
* call here; but since roles aren't members of extensions, it seems like
* user mappings shouldn't be either. Note that the grammar and pg_dump
* would need to be extended too if we change this.
*/
/* Post creation hook for new user mapping */
InvokeObjectPostCreateHook(UserMappingRelationId, umId, 0);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
table_close(rel, RowExclusiveLock);
return myself;
}
/*
* Alter user mapping
*/
ObjectAddress
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;
ObjectAddress address;
RoleSpec *role = (RoleSpec *) stmt->user;
rel = table_open(UserMappingRelationId, RowExclusiveLock);
if (role->roletype == ROLESPEC_PUBLIC)
useId = ACL_ID_PUBLIC;
else
useId = get_rolespec_oid(stmt->user, false);
srv = GetForeignServerByName(stmt->servername, false);
umId = GetSysCacheOid2(USERMAPPINGUSERSERVER, Anum_pg_user_mapping_oid,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid));
if (!OidIsValid(umId))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("user mapping for \"%s\" does not exist for server \"%s\"",
MappingUserName(useId), stmt->servername)));
user_mapping_ddl_aclcheck(useId, srv->serverid, stmt->servername);
tp = SearchSysCacheCopy1(USERMAPPINGOID, ObjectIdGetDatum(umId));
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);
if (isnull)
datum = PointerGetDatum(NULL);
/* Prepare the options array */
datum = transformGenericOptions(UserMappingRelationId,
datum,
stmt->options,
fdw->fdwvalidator);
if (PointerIsValid(DatumGetPointer(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 */
tp = heap_modify_tuple(tp, RelationGetDescr(rel),
repl_val, repl_null, repl_repl);
CatalogTupleUpdate(rel, &tp->t_self, tp);
ObjectAddressSet(address, UserMappingRelationId, umId);
heap_freetuple(tp);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
table_close(rel, RowExclusiveLock);
return address;
}
/*
* Drop user mapping
*/
Oid
RemoveUserMapping(DropUserMappingStmt *stmt)
{
ObjectAddress object;
Oid useId;
Oid umId;
ForeignServer *srv;
RoleSpec *role = (RoleSpec *) stmt->user;
if (role->roletype == ROLESPEC_PUBLIC)
useId = ACL_ID_PUBLIC;
else
{
useId = get_rolespec_oid(stmt->user, stmt->missing_ok);
if (!OidIsValid(useId))
{
/*
* IF EXISTS specified, role not found and not public. Notice this
* and leave.
*/
elog(NOTICE, "role \"%s\" does not exist, skipping",
role->rolename);
return InvalidOid;
}
}
srv = GetForeignServerByName(stmt->servername, true);
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 \"%s\" does not exist, skipping",
stmt->servername)));
return InvalidOid;
}
umId = GetSysCacheOid2(USERMAPPINGUSERSERVER, Anum_pg_user_mapping_oid,
ObjectIdGetDatum(useId),
ObjectIdGetDatum(srv->serverid));
if (!OidIsValid(umId))
{
if (!stmt->missing_ok)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("user mapping for \"%s\" does not exist for server \"%s\"",
MappingUserName(useId), stmt->servername)));
/* IF EXISTS specified, just note it */
ereport(NOTICE,
(errmsg("user mapping for \"%s\" does not exist for server \"%s\", skipping",
MappingUserName(useId), stmt->servername)));
return InvalidOid;
}
user_mapping_ddl_aclcheck(useId, srv->serverid, srv->servername);
/*
* Do the deletion
*/
object.classId = UserMappingRelationId;
object.objectId = umId;
object.objectSubId = 0;
performDeletion(&object, DROP_CASCADE, 0);
if (Gp_role == GP_ROLE_DISPATCH)
{
CdbDispatchUtilityStatement((Node *) stmt,
DF_WITH_SNAPSHOT | DF_CANCEL_ON_ERROR | DF_NEED_TWO_PHASE,
GetAssignedOidsForDispatch(),
NULL);
}
return umId;
}
/*
* Drop user mapping by OID. This is called to clean up dependencies.
*/
void
RemoveUserMappingById(Oid umId)
{
HeapTuple tp;
Relation rel;
rel = table_open(UserMappingRelationId, RowExclusiveLock);
tp = SearchSysCache1(USERMAPPINGOID, ObjectIdGetDatum(umId));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for user mapping %u", umId);
CatalogTupleDelete(rel, &tp->t_self);
ReleaseSysCache(tp);
table_close(rel, RowExclusiveLock);
}
/*
* Create a foreign table
* call after DefineRelation().
*/
void
CreateForeignTable(CreateForeignTableStmt *stmt, Oid relid, bool skip_permission_check)
{
Relation ftrel;
Datum ftoptions;
Datum values[Natts_pg_foreign_table];
bool nulls[Natts_pg_foreign_table];
HeapTuple tuple;
AclResult aclresult;
ObjectAddress myself;
ObjectAddress referenced;
Oid ownerId;
ForeignDataWrapper *fdw;
ForeignServer *server;
/*
* Advance command counter to ensure the pg_attribute tuple is visible;
* the tuple might be updated to add constraints in previous step.
*/
CommandCounterIncrement();
ftrel = table_open(ForeignTableRelationId, RowExclusiveLock);
/*
* For now the owner cannot be specified on create. Use effective user ID.
*/
ownerId = GetUserId();
/*
* Check that the foreign server exists and that we have USAGE on it. Also
* get the actual FDW for option validation etc.
*/
server = GetForeignServerByName(stmt->servername, false);
if (!skip_permission_check)
{
aclresult = pg_foreign_server_aclcheck(server->serverid, ownerId, ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, OBJECT_FOREIGN_SERVER, server->servername);
}
fdw = GetForeignDataWrapper(server->fdwid);
/*
* Insert tuple into pg_foreign_table.
*/
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
values[Anum_pg_foreign_table_ftrelid - 1] = ObjectIdGetDatum(relid);
values[Anum_pg_foreign_table_ftserver - 1] = ObjectIdGetDatum(server->serverid);
/* Add table generic options */
ftoptions = transformGenericOptions(ForeignTableRelationId,
PointerGetDatum(NULL),
stmt->options,
fdw->fdwvalidator);
if (PointerIsValid(DatumGetPointer(ftoptions)))
values[Anum_pg_foreign_table_ftoptions - 1] = ftoptions;
else
nulls[Anum_pg_foreign_table_ftoptions - 1] = true;
tuple = heap_form_tuple(ftrel->rd_att, values, nulls);
CatalogTupleInsert(ftrel, tuple);
heap_freetuple(tuple);
/* Add pg_class dependency on the server */
myself.classId = RelationRelationId;
myself.objectId = relid;
myself.objectSubId = 0;
referenced.classId = ForeignServerRelationId;
referenced.objectId = server->serverid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
table_close(ftrel, RowExclusiveLock);
}
/*
* Import a foreign schema
*/
void
ImportForeignSchema(ImportForeignSchemaStmt *stmt)
{
ForeignServer *server;
ForeignDataWrapper *fdw;
FdwRoutine *fdw_routine;
AclResult aclresult;
List *cmd_list;
ListCell *lc;
/* Check that the foreign server exists and that we have USAGE on it */
server = GetForeignServerByName(stmt->server_name, false);
aclresult = pg_foreign_server_aclcheck(server->serverid, GetUserId(), ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, OBJECT_FOREIGN_SERVER, server->servername);
/* Check that the schema exists and we have CREATE permissions on it */
(void) LookupCreationNamespace(stmt->local_schema);
/* Get the FDW and check it supports IMPORT */
fdw = GetForeignDataWrapper(server->fdwid);
if (!OidIsValid(fdw->fdwhandler))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("foreign-data wrapper \"%s\" has no handler",
fdw->fdwname)));
fdw_routine = GetFdwRoutine(fdw->fdwhandler);
if (fdw_routine->ImportForeignSchema == NULL)
ereport(ERROR,
(errcode(ERRCODE_FDW_NO_SCHEMAS),
errmsg("foreign-data wrapper \"%s\" does not support IMPORT FOREIGN SCHEMA",
fdw->fdwname)));
/* Call FDW to get a list of commands */
cmd_list = fdw_routine->ImportForeignSchema(stmt, server->serverid);
/* Parse and execute each command */
foreach(lc, cmd_list)
{
char *cmd = (char *) lfirst(lc);
import_error_callback_arg callback_arg;
ErrorContextCallback sqlerrcontext;
List *raw_parsetree_list;
ListCell *lc2;
/*
* Setup error traceback support for ereport(). This is so that any
* error in the generated SQL will be displayed nicely.
*/
callback_arg.tablename = NULL; /* not known yet */
callback_arg.cmd = cmd;
sqlerrcontext.callback = import_error_callback;
sqlerrcontext.arg = (void *) &callback_arg;
sqlerrcontext.previous = error_context_stack;
error_context_stack = &sqlerrcontext;
/*
* Parse the SQL string into a list of raw parse trees.
*/
raw_parsetree_list = pg_parse_query(cmd);
/*
* Process each parse tree (we allow the FDW to put more than one
* command per string, though this isn't really advised).
*/
foreach(lc2, raw_parsetree_list)
{
RawStmt *rs = lfirst_node(RawStmt, lc2);
CreateForeignTableStmt *cstmt = (CreateForeignTableStmt *) rs->stmt;
PlannedStmt *pstmt;
/*
* Because we only allow CreateForeignTableStmt, we can skip parse
* analysis, rewrite, and planning steps here.
*/
if (!IsA(cstmt, CreateForeignTableStmt))
elog(ERROR,
"foreign-data wrapper \"%s\" returned incorrect statement type %d",
fdw->fdwname, (int) nodeTag(cstmt));
/* Ignore commands for tables excluded by filter options */
if (!IsImportableForeignTable(cstmt->base.relation->relname, stmt))
continue;
/* Enable reporting of current table's name on error */
callback_arg.tablename = cstmt->base.relation->relname;
/* Ensure creation schema is the one given in IMPORT statement */
cstmt->base.relation->schemaname = pstrdup(stmt->local_schema);
/* No planning needed, just make a wrapper PlannedStmt */
pstmt = makeNode(PlannedStmt);
pstmt->commandType = CMD_UTILITY;
pstmt->canSetTag = false;
pstmt->utilityStmt = (Node *) cstmt;
pstmt->stmt_location = rs->stmt_location;
pstmt->stmt_len = rs->stmt_len;
/* Execute statement */
ProcessUtility(pstmt,
cmd,
PROCESS_UTILITY_SUBCOMMAND, NULL, NULL,
None_Receiver, NULL);
/* Be sure to advance the command counter between subcommands */
CommandCounterIncrement();
callback_arg.tablename = NULL;
}
error_context_stack = sqlerrcontext.previous;
}
}
/*
* error context callback to let us supply the failing SQL statement's text
*/
static void
import_error_callback(void *arg)
{
import_error_callback_arg *callback_arg = (import_error_callback_arg *) arg;
int syntaxerrposition;
/* If it's a syntax error, convert to internal syntax error report */
syntaxerrposition = geterrposition();
if (syntaxerrposition > 0)
{
errposition(0);
internalerrposition(syntaxerrposition);
internalerrquery(callback_arg->cmd);
}
if (callback_arg->tablename)
errcontext("importing foreign table \"%s\"",
callback_arg->tablename);
}
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