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Add contrib/pg_walinspect.

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Provides similar functionality to pg_waldump, but from a SQL interface
rather than a separate utility.

Author: Bharath Rupireddy
Reviewed-by: Greg Stark, Kyotaro Horiguchi, Andres Freund, Ashutosh Sharma, Nitin Jadhav, RKN Sai Krishna
Discussion: https://postgr.es/m/CALj2ACUGUYXsEQdKhEdsBzhGEyF3xggvLdD8C0VT72TNEfOiog%40mail.gmail.com
This commit is contained in:
Jeff Davis
2022-04-08 00:02:10 -07:00
parent 708007dced
commit 2258e76f90
25 changed files with 1675 additions and 204 deletions
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120
contrib/pg_walinspect/sql/pg_walinspect.sql Normal file
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CREATE EXTENSION pg_walinspect;
CREATE TABLE sample_tbl(col1 int, col2 int);
-- Make sure checkpoints don't interfere with the test.
SELECT lsn as wal_lsn1 FROM
pg_create_physical_replication_slot('regress_pg_walinspect_slot', true, false)
\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(1, 2);
-- ===================================================================
-- Tests for input validation
-- ===================================================================
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn2', :'wal_lsn1'); -- ERROR
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn2', :'wal_lsn1'); -- ERROR
-- ===================================================================
-- Tests for all function executions
-- ===================================================================
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info(:'wal_lsn1');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info_till_end_of_wal(:'wal_lsn1');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', :'wal_lsn2');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats_till_end_of_wal(:'wal_lsn1');
-- ===================================================================
-- 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';
-- ===================================================================
-- 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';
-- ===================================================================
-- Tests for permissions
-- ===================================================================
CREATE ROLE regress_pg_walinspect;
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- no
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- no
-- 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
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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;
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
SELECT has_function_privilege('regress_pg_walinspect',
'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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;
-- ===================================================================
-- Clean up
-- ===================================================================
DROP ROLE regress_pg_walinspect;
SELECT pg_drop_replication_slot('regress_pg_walinspect_slot');
DROP TABLE sample_tbl;