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foreign_server.c
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foreign_server.c
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/*-------------------------------------------------------------------------
*
* foreign_server.c
* Commands for FOREIGN SERVER statements.
*
* Copyright (c) Citus Data, Inc.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/pg_foreign_server.h"
#include "distributed/commands/utility_hook.h"
#include "distributed/commands.h"
#include "distributed/deparser.h"
#include "distributed/listutils.h"
#include "distributed/metadata/distobject.h"
#include "distributed/metadata_sync.h"
#include "distributed/worker_transaction.h"
#include "foreign/foreign.h"
#include "nodes/makefuncs.h"
#include "nodes/parsenodes.h"
#include "nodes/primnodes.h"
static Node * RecreateForeignServerStmt(Oid serverId);
static bool NameListHasDistributedServer(List *serverNames);
/*
* PreprocessCreateForeignServerStmt is called during the planning phase for
* CREATE SERVER.
*/
List *
PreprocessCreateForeignServerStmt(Node *node, const char *queryString,
ProcessUtilityContext processUtilityContext)
{
if (!ShouldPropagate())
{
return NIL;
}
EnsureCoordinator();
char *sql = DeparseTreeNode(node);
/* to prevent recursion with mx we disable ddl propagation */
List *commands = list_make3(DISABLE_DDL_PROPAGATION,
(void *) sql,
ENABLE_DDL_PROPAGATION);
return NodeDDLTaskList(NON_COORDINATOR_NODES, commands);
}
/*
* PreprocessAlterForeignServerStmt is called during the planning phase for
* ALTER SERVER .. OPTIONS ..
*/
List *
PreprocessAlterForeignServerStmt(Node *node, const char *queryString,
ProcessUtilityContext processUtilityContext)
{
AlterForeignServerStmt *stmt = castNode(AlterForeignServerStmt, node);
ForeignServer *server = GetForeignServerByName(stmt->servername, false);
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, server->serverid);
if (!ShouldPropagateObject(&address))
{
return NIL;
}
EnsureCoordinator();
char *sql = DeparseTreeNode(node);
/* to prevent recursion with mx we disable ddl propagation */
List *commands = list_make3(DISABLE_DDL_PROPAGATION,
(void *) sql,
ENABLE_DDL_PROPAGATION);
return NodeDDLTaskList(NON_COORDINATOR_NODES, commands);
}
/*
* PreprocessRenameForeignServerStmt is called during the planning phase for
* ALTER SERVER RENAME.
*/
List *
PreprocessRenameForeignServerStmt(Node *node, const char *queryString,
ProcessUtilityContext processUtilityContext)
{
RenameStmt *stmt = castNode(RenameStmt, node);
Assert(stmt->renameType == OBJECT_FOREIGN_SERVER);
char *serverName = strVal(stmt->object);
ForeignServer *server = GetForeignServerByName(serverName, false);
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, server->serverid);
/* filter distributed servers */
if (!ShouldPropagateObject(&address))
{
return NIL;
}
EnsureCoordinator();
char *sql = DeparseTreeNode(node);
/* to prevent recursion with mx we disable ddl propagation */
List *commands = list_make3(DISABLE_DDL_PROPAGATION,
(void *) sql,
ENABLE_DDL_PROPAGATION);
return NodeDDLTaskList(NON_COORDINATOR_NODES, commands);
}
/*
* PreprocessAlterForeignServerOwnerStmt is called during the planning phase for
* ALTER SERVER .. OWNER TO.
*/
List *
PreprocessAlterForeignServerOwnerStmt(Node *node, const char *queryString,
ProcessUtilityContext processUtilityContext)
{
AlterOwnerStmt *stmt = castNode(AlterOwnerStmt, node);
Assert(stmt->objectType == OBJECT_FOREIGN_SERVER);
char *serverName = strVal(stmt->object);
ForeignServer *server = GetForeignServerByName(serverName, false);
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, server->serverid);
/* filter distributed servers */
if (!ShouldPropagateObject(&address))
{
return NIL;
}
EnsureCoordinator();
char *sql = DeparseTreeNode(node);
/* to prevent recursion with mx we disable ddl propagation */
List *commands = list_make3(DISABLE_DDL_PROPAGATION,
(void *) sql,
ENABLE_DDL_PROPAGATION);
return NodeDDLTaskList(NON_COORDINATOR_NODES, commands);
}
/*
* PreprocessDropForeignServerStmt is called during the planning phase for
* DROP SERVER.
*/
List *
PreprocessDropForeignServerStmt(Node *node, const char *queryString,
ProcessUtilityContext processUtilityContext)
{
DropStmt *stmt = castNode(DropStmt, node);
Assert(stmt->removeType == OBJECT_FOREIGN_SERVER);
bool includesDistributedServer = NameListHasDistributedServer(stmt->objects);
if (!includesDistributedServer)
{
return NIL;
}
if (list_length(stmt->objects) > 1)
{
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot drop distributed server with other servers"),
errhint("Try dropping each object in a separate DROP command")));
}
if (!ShouldPropagate())
{
return NIL;
}
EnsureCoordinator();
Assert(list_length(stmt->objects) == 1);
Value *serverValue = linitial(stmt->objects);
ForeignServer *server = GetForeignServerByName(strVal(serverValue), false);
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, server->serverid);
/* unmark distributed server */
UnmarkObjectDistributed(&address);
const char *deparsedStmt = DeparseTreeNode((Node *) stmt);
/*
* To prevent recursive propagation in mx architecture, we disable ddl
* propagation before sending the command to workers.
*/
List *commands = list_make3(DISABLE_DDL_PROPAGATION,
(void *) deparsedStmt,
ENABLE_DDL_PROPAGATION);
return NodeDDLTaskList(NON_COORDINATOR_NODES, commands);
}
/*
* PostprocessCreateForeignServerStmt is called after a CREATE SERVER command has
* been executed by standard process utility.
*/
List *
PostprocessCreateForeignServerStmt(Node *node, const char *queryString)
{
bool missingOk = false;
ObjectAddress typeAddress = GetObjectAddressFromParseTree(node, missingOk);
EnsureDependenciesExistOnAllNodes(&typeAddress);
return NIL;
}
/*
* CreateForeignServerStmtObjectAddress finds the ObjectAddress for the server
* that is created by given CreateForeignServerStmt. If missingOk is false and if
* the server does not exist, then it errors out.
*
* Never returns NULL, but the objid in the address can be invalid if missingOk
* was set to true.
*/
ObjectAddress
CreateForeignServerStmtObjectAddress(Node *node, bool missing_ok)
{
CreateForeignServerStmt *stmt = castNode(CreateForeignServerStmt, node);
ForeignServer *server = GetForeignServerByName(stmt->servername, missing_ok);
Oid serverOid = server->serverid;
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, serverOid);
return address;
}
/*
* GetForeignServerCreateDDLCommand returns a list that includes the CREATE SERVER
* command that would recreate the given server on a new node.
*/
List *
GetForeignServerCreateDDLCommand(Oid serverId)
{
/* generate a statement for creation of the server in "if not exists" construct */
Node *stmt = RecreateForeignServerStmt(serverId);
/* capture ddl command for the create statement */
const char *ddlCommand = DeparseTreeNode(stmt);
List *ddlCommands = list_make1((void *) ddlCommand);
return ddlCommands;
}
/*
* RecreateForeignServerStmt returns a parsetree for a CREATE SERVER statement
* that would recreate the given server on a new node.
*/
static Node *
RecreateForeignServerStmt(Oid serverId)
{
ForeignServer *server = GetForeignServer(serverId);
CreateForeignServerStmt *createStmt = makeNode(CreateForeignServerStmt);
/* set server name and if_not_exists fields */
createStmt->servername = pstrdup(server->servername);
createStmt->if_not_exists = true;
/* set foreign data wrapper */
ForeignDataWrapper *fdw = GetForeignDataWrapper(server->fdwid);
createStmt->fdwname = pstrdup(fdw->fdwname);
/* set all fields using the existing server */
if (server->servertype != NULL)
{
createStmt->servertype = pstrdup(server->servertype);
}
if (server->serverversion != NULL)
{
createStmt->version = pstrdup(server->serverversion);
}
createStmt->options = NIL;
int location = -1;
DefElem *option = NULL;
foreach_ptr(option, server->options)
{
DefElem *copyOption = makeDefElem(option->defname, option->arg, location);
createStmt->options = lappend(createStmt->options, copyOption);
}
return (Node *) createStmt;
}
/*
* NameListHasDistributedServer takes a namelist of servers and returns true if at least
* one of them is distributed. Returns false otherwise.
*/
static bool
NameListHasDistributedServer(List *serverNames)
{
Value *serverValue = NULL;
foreach_ptr(serverValue, serverNames)
{
char *serverNameString = strVal(serverValue);
ForeignServer *server = GetForeignServerByName(serverNameString, false);
ObjectAddress address = { 0 };
ObjectAddressSet(address, ForeignServerRelationId, server->serverid);
if (IsObjectDistributed(&address))
{
return true;
}
}
return false;
}