diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
new file mode 100644
index 903b3a6..7bc0e93
*** a/src/backend/commands/variable.c
--- b/src/backend/commands/variable.c
***************
*** 32,37 ****
--- 32,41 ----
  #include "utils/timestamp.h"
  #include "mb/pg_wchar.h"
  
+ /* Hooks for plugins to get control in check_role() and assign_role() */
+ SetRoleCheck_hook_type SetRoleCheck_hook = NULL;
+ SetRoleAssign_hook_type SetRoleAssign_hook = NULL;
+ 
  /*
   * DATESTYLE
   */
*************** typedef struct
*** 768,773 ****
--- 772,778 ----
  	/* This is the "extra" state for both SESSION AUTHORIZATION and ROLE */
  	Oid			roleid;
  	bool		is_superuser;
+ 	void		*data;
  } role_auth_extra;
  
  bool
*************** check_role(char **newval, void **extra,
*** 900,905 ****
--- 905,913 ----
  	myextra->is_superuser = is_superuser;
  	*extra = (void *) myextra;
  
+ 	if (SetRoleCheck_hook)
+ 		(*SetRoleCheck_hook) (GetSessionUserId(), roleid, is_superuser, myextra->data);
+ 
  	return true;
  }
  
*************** assign_role(const char *newval, void *ex
*** 908,913 ****
--- 916,928 ----
  {
  	role_auth_extra *myextra = (role_auth_extra *) extra;
  
+ 	/*
+ 	 * Any defined hooks must be able to execute in a failed
+ 	 * transaction to restore a prior value of the ROLE GUC variable.
+ 	 */
+ 	if (SetRoleAssign_hook)
+ 		(*SetRoleAssign_hook) (myextra->roleid, myextra->is_superuser, &myextra->data);
+ 
  	SetCurrentRoleId(myextra->roleid, myextra->is_superuser);
  }
  
diff --git a/src/include/commands/variable.h b/src/include/commands/variable.h
new file mode 100644
index 8105951..f229749
*** a/src/include/commands/variable.h
--- b/src/include/commands/variable.h
***************
*** 12,17 ****
--- 12,22 ----
  
  #include "utils/guc.h"
  
+ /* Hooks for plugins to get control in check_role() and assign_role() */
+ typedef void (*SetRoleCheck_hook_type) (Oid, Oid, bool, void**);
+ extern PGDLLIMPORT SetRoleCheck_hook_type SetRoleCheck_hook;
+ typedef void (*SetRoleAssign_hook_type) (Oid, bool, void*);
+ extern PGDLLIMPORT SetRoleAssign_hook_type SetRoleAssign_hook;
  
  extern bool check_datestyle(char **newval, void **extra, GucSource source);
  extern void assign_datestyle(const char *newval, void *extra);