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pg_walinspect: Add pg_get_wal_fpi_info()

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This function is able to extract the full page images from a range of
records, specified as of input arguments start_lsn and end_lsn.  Like
the other functions of this module, an error is returned if using LSNs
that do not reflect real system values.  All the FPIs stored in a single
record are extracted.

The module's version is bumped to 1.1.

Author: Bharath Rupireddy
Reviewed-by: Bertrand Drouvot
Discussion: https://postgr.es/m/CALj2ACVCcvzd7WiWvD=6_7NBvVB_r6G0EGSxL4F8vosAi6Se4g@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-01-23 13:55:18 +09:00
parent 16fd03e956
commit c31cf1c03d
8 changed files with 245 additions and 4 deletions
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44
contrib/pg_walinspect/expected/pg_walinspect.out
View File

@ -10,7 +10,7 @@ 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(1, 2);
INSERT INTO sample_tbl SELECT * FROM generate_series(3, 4);
-- ===================================================================
-- Tests for input validation
-- ===================================================================
@ -73,6 +73,23 @@ SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2'
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
-- ===================================================================
@ -98,6 +115,13 @@ SELECT has_function_privilege('regress_pg_walinspect',
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',
@ -121,6 +145,13 @@ SELECT has_function_privilege('regress_pg_walinspect',
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)
@ -129,6 +160,8 @@ 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
@ -150,12 +183,21 @@ SELECT has_function_privilege('regress_pg_walinspect',
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
-- ===================================================================