Improve pg_audit regression tests

Instead of creating a new superuser role, extract out what the current
user is and use that user instead.  Further, clean up and drop all
objects created by the regression test.

Pointed out by Tom.

contrib/pg_audit/expected/pg_audit.out

@@ -12,11 +12,11 @@ create extension pg_audit;
 --     STATEMENT - The statement being logged
 --     PARAMETER - If parameter logging is requested, they will follow the
 --                 statement
+select current_user \gset
 --
--- Create a superuser role that we know the name of for testing
-CREATE USER super SUPERUSER;
-ALTER ROLE super SET pg_audit.log = 'Role';
-ALTER ROLE super SET pg_audit.log_level = 'notice';
+-- Set pg_audit parameters for the current (super)user.
+ALTER ROLE :current_user SET pg_audit.log = 'Role';
+ALTER ROLE :current_user SET pg_audit.log_level = 'notice';
 CREATE FUNCTION load_pg_audit( )
  RETURNS VOID
  LANGUAGE plpgsql
@@ -31,7 +31,7 @@ $function$;
 -- being loaded from shared_preload_libraries.  Otherwise, the hooks
 -- won't be set up and called correctly, leading to lots of ugly
 -- errors.
-\connect - super;
+\connect - :current_user;
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -70,7 +70,7 @@ DROP TABLE test;
 NOTICE:  AUDIT: SESSION,2,1,DDL,DROP TABLE,TABLE,public.test,DROP TABLE test;,<not logged>
 --
 -- Create second test user
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -241,7 +241,7 @@ UPDATE test3
 WARNING:  AUDIT: OBJECT,6,1,WRITE,INSERT,TABLE,public.test2,<previously logged>,<previously logged>
 --
 -- Change permissions of user 2 so that only object logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -328,7 +328,7 @@ DROP TABLE test3;
 DROP TABLE test4;
 --
 -- Change permissions of user 1 so that session logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -376,7 +376,7 @@ INSERT INTO account (id, name, password, description)
 			 VALUES (1, 'user1', 'HASH1', 'blah, blah');
 --
 -- Change permissions of user 1 so that only object logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -435,7 +435,7 @@ NOTICE:  AUDIT: OBJECT,2,1,WRITE,UPDATE,TABLE,public.account,"UPDATE account
    SET password = 'HASH2';",<not logged>
 --
 -- Change permissions of user 1 so that session relation logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -546,7 +546,7 @@ NOTICE:  AUDIT: SESSION,5,1,WRITE,UPDATE,TABLE,public.account,"UPDATE account
    SET password = 'HASH2';",<not logged>
 --
 -- Change back to superuser to do exhaustive tests
-\connect - super
+\connect - :current_user
 select load_pg_audit();
  load_pg_audit 
 ---------------
@@ -751,12 +751,12 @@ NOTICE:  AUDIT: SESSION,26,1,READ,SELECT,TABLE,public.test,"SELECT
 (0 rows)
 
 SELECT 1,
-	   current_user;
+	   substring('Thomas' from 2 for 3);
 NOTICE:  AUDIT: SESSION,27,1,READ,SELECT,,,"SELECT 1,
-	   current_user;",<none>
- ?column? | current_user 
-----------+--------------
-        1 | super
+	   substring('Thomas' from 2 for 3);",<none>
+ ?column? | substring 
+----------+-----------
+        1 | hom
 (1 row)
 
 DO $$
@@ -1054,3 +1054,18 @@ GRANT user1 TO user2;
 NOTICE:  AUDIT: SESSION,59,1,ROLE,GRANT ROLE,,,GRANT user1 TO user2;,<none>
 REVOKE user1 FROM user2;
 NOTICE:  AUDIT: SESSION,60,1,ROLE,REVOKE ROLE,,,REVOKE user1 FROM user2;,<none>
+DROP TABLE test.account_copy;
+DROP TABLE test.test_insert;
+DROP SCHEMA test;
+DROP TABLE foo.bar;
+DROP TABLE foo.baz;
+DROP SCHEMA foo;
+DROP TABLE hoge;
+DROP TABLE account;
+DROP TABLE account_role_map;
+DROP USER user2;
+NOTICE:  AUDIT: SESSION,61,1,ROLE,DROP ROLE,,,DROP USER user2;,<none>
+DROP USER user1;
+NOTICE:  AUDIT: SESSION,62,1,ROLE,DROP ROLE,,,DROP USER user1;,<none>
+DROP ROLE auditor;
+NOTICE:  AUDIT: SESSION,63,1,ROLE,DROP ROLE,,,DROP ROLE auditor;,<none>

contrib/pg_audit/sql/pg_audit.sql

@@ -14,11 +14,12 @@ create extension pg_audit;
 --     PARAMETER - If parameter logging is requested, they will follow the
 --                 statement
 
+select current_user \gset
+
 --
--- Create a superuser role that we know the name of for testing
-CREATE USER super SUPERUSER;
-ALTER ROLE super SET pg_audit.log = 'Role';
-ALTER ROLE super SET pg_audit.log_level = 'notice';
+-- Set pg_audit parameters for the current (super)user.
+ALTER ROLE :current_user SET pg_audit.log = 'Role';
+ALTER ROLE :current_user SET pg_audit.log_level = 'notice';
 
 CREATE FUNCTION load_pg_audit( )
  RETURNS VOID
@@ -35,7 +36,7 @@ $function$;
 -- being loaded from shared_preload_libraries.  Otherwise, the hooks
 -- won't be set up and called correctly, leading to lots of ugly
 -- errors.
-\connect - super;
+\connect - :current_user;
 select load_pg_audit();
 
 --
@@ -58,7 +59,7 @@ DROP TABLE test;
 
 --
 -- Create second test user
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 
 CREATE USER user2;
@@ -168,7 +169,7 @@ UPDATE test3
 
 --
 -- Change permissions of user 2 so that only object logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 alter role user2 set pg_audit.log = 'NONE';
 
@@ -243,7 +244,7 @@ DROP TABLE test4;
 
 --
 -- Change permissions of user 1 so that session logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 alter role user1 set pg_audit.log = 'DDL, READ';
 \connect - user1
@@ -271,7 +272,7 @@ INSERT INTO account (id, name, password, description)
 
 --
 -- Change permissions of user 1 so that only object logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 alter role user1 set pg_audit.log = 'none';
 alter role user1 set pg_audit.role = 'auditor';
@@ -310,7 +311,7 @@ UPDATE account
 
 --
 -- Change permissions of user 1 so that session relation logging will be done
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 alter role user1 set pg_audit.log_relation = on;
 alter role user1 set pg_audit.log = 'read, WRITE';
@@ -372,7 +373,7 @@ UPDATE account
 
 --
 -- Change back to superuser to do exhaustive tests
-\connect - super
+\connect - :current_user
 select load_pg_audit();
 SET pg_audit.log = 'ALL';
 SET pg_audit.log_level = 'notice';
@@ -486,7 +487,7 @@ SELECT
   FROM test;
 
 SELECT 1,
-	   current_user;
+	   substring('Thomas' from 2 for 3);
 
 DO $$
 DECLARE
@@ -644,3 +645,16 @@ drop table bar;
 SET pg_audit.log = 'role';
 GRANT user1 TO user2;
 REVOKE user1 FROM user2;
+
+DROP TABLE test.account_copy;
+DROP TABLE test.test_insert;
+DROP SCHEMA test;
+DROP TABLE foo.bar;
+DROP TABLE foo.baz;
+DROP SCHEMA foo;
+DROP TABLE hoge;
+DROP TABLE account;
+DROP TABLE account_role_map;
+DROP USER user2;
+DROP USER user1;
+DROP ROLE auditor;