1 files changed, 84 insertions, 0 deletions
diff --git a/src/include/foreign/foreign.h b/src/include/foreign/foreign.h
new file mode 100644
index 0000000..5e0cf53
--- /dev/null
+++ b/src/include/foreign/foreign.h
@@ -0,0 +1,84 @@
+/*-------------------------------------------------------------------------
+ *
+ * foreign.h
+ *	  support for foreign-data wrappers, servers and user mappings.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ *
+ * src/include/foreign/foreign.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FOREIGN_H
+#define FOREIGN_H
+
+#include "nodes/parsenodes.h"
+
+
+/* Helper for obtaining username for user mapping */
+#define MappingUserName(userid) \
+	(OidIsValid(userid) ? GetUserNameFromId(userid, false) : "public")
+
+
+typedef struct ForeignDataWrapper
+{
+	Oid			fdwid;			/* FDW Oid */
+	Oid			owner;			/* FDW owner user Oid */
+	char	   *fdwname;		/* Name of the FDW */
+	Oid			fdwhandler;		/* Oid of handler function, or 0 */
+	Oid			fdwvalidator;	/* Oid of validator function, or 0 */
+	List	   *options;		/* fdwoptions as DefElem list */
+} ForeignDataWrapper;
+
+typedef struct ForeignServer
+{
+	Oid			serverid;		/* server Oid */
+	Oid			fdwid;			/* foreign-data wrapper */
+	Oid			owner;			/* server owner user Oid */
+	char	   *servername;		/* name of the server */
+	char	   *servertype;		/* server type, optional */
+	char	   *serverversion;	/* server version, optional */
+	List	   *options;		/* srvoptions as DefElem list */
+} ForeignServer;
+
+typedef struct UserMapping
+{
+	Oid			umid;			/* Oid of user mapping */
+	Oid			userid;			/* local user Oid */
+	Oid			serverid;		/* server Oid */
+	List	   *options;		/* useoptions as DefElem list */
+} UserMapping;
+
+typedef struct ForeignTable
+{
+	Oid			relid;			/* relation Oid */
+	Oid			serverid;		/* server Oid */
+	List	   *options;		/* ftoptions as DefElem list */
+} ForeignTable;
+
+/* Flags for GetForeignServerExtended */
+#define FSV_MISSING_OK	0x01
+
+/* Flags for GetForeignDataWrapperExtended */
+#define FDW_MISSING_OK	0x01
+
+
+extern ForeignServer *GetForeignServer(Oid serverid);
+extern ForeignServer *GetForeignServerExtended(Oid serverid,
+											   bits16 flags);
+extern ForeignServer *GetForeignServerByName(const char *name, bool missing_ok);
+extern UserMapping *GetUserMapping(Oid userid, Oid serverid);
+extern ForeignDataWrapper *GetForeignDataWrapper(Oid fdwid);
+extern ForeignDataWrapper *GetForeignDataWrapperExtended(Oid fdwid,
+														 bits16 flags);
+extern ForeignDataWrapper *GetForeignDataWrapperByName(const char *name,
+													   bool missing_ok);
+extern ForeignTable *GetForeignTable(Oid relid);
+
+extern List *GetForeignColumnOptions(Oid relid, AttrNumber attnum);
+
+extern Oid	get_foreign_data_wrapper_oid(const char *fdwname, bool missing_ok);
+extern Oid	get_foreign_server_oid(const char *servername, bool missing_ok);
+
+#endif							/* FOREIGN_H */