CREATE EXTENSION pg_walinspect;
-- Make sure checkpoints don't interfere with the test.
SELECT 'init' FROM pg_create_physical_replication_slot('regress_pg_walinspect_slot', true, false);
 ?column? 
----------
 init
(1 row)

CREATE TABLE sample_tbl(col1 int, col2 int);
SELECT pg_current_wal_lsn() AS wal_lsn1 \gset
INSERT INTO sample_tbl SELECT * FROM generate_series(1, 2);
SELECT pg_current_wal_lsn() AS wal_lsn2 \gset
INSERT INTO sample_tbl SELECT * FROM generate_series(3, 4);
-- ===================================================================
-- Tests for input validation
-- ===================================================================
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn2', :'wal_lsn1'); -- ERROR
ERROR:  WAL start LSN must be less than end LSN
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn2', :'wal_lsn1'); -- ERROR
ERROR:  WAL start LSN must be less than end LSN
-- ===================================================================
-- Tests for all function executions
-- ===================================================================
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info(:'wal_lsn1');
 ok 
----
 t
(1 row)

SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2');
 ok 
----
 t
(1 row)

SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info_till_end_of_wal(:'wal_lsn1');
 ok 
----
 t
(1 row)

SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', :'wal_lsn2');
 ok 
----
 t
(1 row)

SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats_till_end_of_wal(:'wal_lsn1');
 ok 
----
 t
(1 row)

-- ===================================================================
-- Test for filtering out WAL records of a particular table
-- ===================================================================
SELECT oid AS sample_tbl_oid FROM pg_class WHERE relname = 'sample_tbl' \gset
SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
			WHERE block_ref LIKE concat('%', :'sample_tbl_oid', '%') AND resource_manager = 'Heap';
 ok 
----
 t
(1 row)

-- ===================================================================
-- Test for filtering out WAL records based on resource_manager and
-- record_type
-- ===================================================================
SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
			WHERE resource_manager = 'Heap' AND record_type = 'INSERT';
 ok 
----
 t
(1 row)

-- ===================================================================
-- Tests to get full page image (FPI) from WAL record
-- ===================================================================
SELECT pg_current_wal_lsn() AS wal_lsn3 \gset
-- Force FPI on the next update.
CHECKPOINT;
-- Update table to generate an FPI.
UPDATE sample_tbl SET col1 = col1 * 100 WHERE col1 = 1;
SELECT pg_current_wal_lsn() AS wal_lsn4 \gset
-- Check if we get FPI from WAL record.
SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_fpi_info(:'wal_lsn3', :'wal_lsn4')
  WHERE relfilenode = :'sample_tbl_oid';
 ok 
----
 t
(1 row)

-- ===================================================================
-- Tests for permissions
-- ===================================================================
CREATE ROLE regress_pg_walinspect;
SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- no
 has_function_privilege 
------------------------
 f
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
 has_function_privilege 
------------------------
 f
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- no
 has_function_privilege 
------------------------
 f
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_fpi_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
 has_function_privilege 
------------------------
 f
(1 row)

-- Functions accessible by users with role pg_read_server_files
GRANT pg_read_server_files TO regress_pg_walinspect;
SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_fpi_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

REVOKE pg_read_server_files FROM regress_pg_walinspect;
-- Superuser can grant execute to other users
GRANT EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
  TO regress_pg_walinspect;
GRANT EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
  TO regress_pg_walinspect;
GRANT EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
  TO regress_pg_walinspect;
GRANT EXECUTE ON FUNCTION pg_get_wal_fpi_info(pg_lsn, pg_lsn)
  TO regress_pg_walinspect;
SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

SELECT has_function_privilege('regress_pg_walinspect',
  'pg_get_wal_fpi_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
 has_function_privilege 
------------------------
 t
(1 row)

REVOKE EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
  FROM regress_pg_walinspect;
REVOKE EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
  FROM regress_pg_walinspect;
REVOKE EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
  FROM regress_pg_walinspect;
REVOKE EXECUTE ON FUNCTION pg_get_wal_fpi_info(pg_lsn, pg_lsn)
  FROM regress_pg_walinspect;
-- ===================================================================
-- Clean up
-- ===================================================================
DROP ROLE regress_pg_walinspect;
SELECT pg_drop_replication_slot('regress_pg_walinspect_slot');
 pg_drop_replication_slot 
--------------------------
 
(1 row)

DROP TABLE sample_tbl;