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5c1b662807
This commit reworks a bit the set-returning functions of pg_walinspect, making them more flexible regarding their end LSN: - pg_get_wal_records_info() - pg_get_wal_stats() - pg_get_wal_block_info() The end LSNs given to these functions is now handled so as a value higher than the current LSN of the cluster (insert LSN for a primary, or replay LSN for a standby) does not raise an error, giving more flexibility to monitoring queries. Instead, the functions return results up to the current LSN, as found at the beginning of each function call. As an effect of that, pg_get_wal_records_info_till_end_of_wal() and pg_get_wal_stats_till_end_of_wal() are now removed from 1.1, as the existing, equivalent functions are able to offer the same possibilities. Author: Bharath Rupireddy Discussion: https://postgr.es/m/CALj2ACU0_q-o4DSweyaW9NO1KBx-QkN6G_OzYQvpjf3CZVASkg@mail.gmail.com
158 lines
6.9 KiB
SQL
158 lines
6.9 KiB
SQL
CREATE EXTENSION pg_walinspect;
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-- Mask DETAIL messages as these could refer to current LSN positions.
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\set VERBOSITY terse
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-- Make sure checkpoints don't interfere with the test.
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SELECT 'init' FROM pg_create_physical_replication_slot('regress_pg_walinspect_slot', true, false);
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CREATE TABLE sample_tbl(col1 int, col2 int);
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-- Save some LSNs for comparisons
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SELECT pg_current_wal_lsn() AS wal_lsn1 \gset
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INSERT INTO sample_tbl SELECT * FROM generate_series(1, 2);
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SELECT pg_current_wal_lsn() AS wal_lsn2 \gset
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INSERT INTO sample_tbl SELECT * FROM generate_series(3, 4);
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-- ===================================================================
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-- Tests for input validation
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-- ===================================================================
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-- Invalid input LSN.
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SELECT * FROM pg_get_wal_record_info('0/0');
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-- Invalid start LSN.
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SELECT * FROM pg_get_wal_records_info('0/0', :'wal_lsn1');
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SELECT * FROM pg_get_wal_stats('0/0', :'wal_lsn1');
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SELECT * FROM pg_get_wal_block_info('0/0', :'wal_lsn1');
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-- Start LSN > End LSN.
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SELECT * FROM pg_get_wal_records_info(:'wal_lsn2', :'wal_lsn1');
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SELECT * FROM pg_get_wal_stats(:'wal_lsn2', :'wal_lsn1');
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SELECT * FROM pg_get_wal_block_info(:'wal_lsn2', :'wal_lsn1');
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-- LSNs with the highest value possible.
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info('FFFFFFFF/FFFFFFFF');
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-- Success with end LSNs.
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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-- failures with start LSNs
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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-- ===================================================================
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-- Tests for all function executions
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-- ===================================================================
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info(:'wal_lsn1');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', :'wal_lsn2');
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SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', :'wal_lsn2');
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-- ===================================================================
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-- Test for filtering out WAL records of a particular table
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-- ===================================================================
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SELECT oid AS sample_tbl_oid FROM pg_class WHERE relname = 'sample_tbl' \gset
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
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WHERE block_ref LIKE concat('%', :'sample_tbl_oid', '%') AND resource_manager = 'Heap';
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-- ===================================================================
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-- Test for filtering out WAL records based on resource_manager and
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-- record_type
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-- ===================================================================
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
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WHERE resource_manager = 'Heap' AND record_type = 'INSERT';
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-- ===================================================================
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-- Tests to get block information from WAL record
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-- ===================================================================
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-- Update table to generate some block data
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SELECT pg_current_wal_lsn() AS wal_lsn3 \gset
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UPDATE sample_tbl SET col1 = col1 + 1 WHERE col1 = 1;
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SELECT pg_current_wal_lsn() AS wal_lsn4 \gset
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-- Check if we get block data from WAL record.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn3', :'wal_lsn4')
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WHERE relfilenode = :'sample_tbl_oid' AND blockdata IS NOT NULL;
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-- Force full-page image on the next update.
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SELECT pg_current_wal_lsn() AS wal_lsn5 \gset
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CHECKPOINT;
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UPDATE sample_tbl SET col1 = col1 + 1 WHERE col1 = 2;
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SELECT pg_current_wal_lsn() AS wal_lsn6 \gset
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-- Check if we get FPI from WAL record.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn5', :'wal_lsn6')
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WHERE relfilenode = :'sample_tbl_oid' AND fpi IS NOT NULL;
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-- ===================================================================
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-- Tests for permissions
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-- ===================================================================
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CREATE ROLE regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
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-- Functions accessible by users with role pg_read_server_files
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GRANT pg_read_server_files TO regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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REVOKE pg_read_server_files FROM regress_pg_walinspect;
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-- Superuser can grant execute to other users
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GRANT EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn)
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TO regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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REVOKE EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn)
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FROM regress_pg_walinspect;
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-- ===================================================================
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-- Clean up
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-- ===================================================================
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DROP ROLE regress_pg_walinspect;
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SELECT pg_drop_replication_slot('regress_pg_walinspect_slot');
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DROP TABLE sample_tbl;
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DROP EXTENSION pg_walinspect;
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