mirror of https://github.com/postgres/postgres
This module provides SQL functions that allow to inspect logical decoding components. It currently allows to inspect the contents of serialized logical snapshots of a running database cluster, which is useful for debugging or educational purposes. Author: Bertrand Drouvot Reviewed-by: Amit Kapila, Shveta Malik, Peter Smith, Peter Eisentraut Reviewed-by: David G. Johnston Discussion: https://postgr.es/m/ZscuZ92uGh3wm4tW%40ip-10-97-1-34.eu-west-3.compute.internalpull/182/head
Masahiko Sawada
1 year ago
parent
e2fd615ecc
commit
7cdfeee320
@ -0,0 +1,6 @@ |
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# Generated subdirectories |
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/log/ |
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/results/ |
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/output_iso/ |
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/tmp_check/ |
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/tmp_check_iso/ |
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@ -0,0 +1,31 @@ |
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# contrib/pg_logicalinspect/Makefile
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MODULE_big = pg_logicalinspect
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OBJS = \
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$(WIN32RES) \
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pg_logicalinspect.o
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PGFILEDESC = "pg_logicalinspect - functions to inspect logical decoding components"
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EXTENSION = pg_logicalinspect
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DATA = pg_logicalinspect--1.0.sql
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EXTRA_INSTALL = contrib/test_decoding
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ISOLATION = logical_inspect
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ISOLATION_OPTS = --temp-config $(top_srcdir)/contrib/pg_logicalinspect/logicalinspect.conf
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# Disabled because these tests require "wal_level=logical", which
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# some installcheck users do not have (e.g. buildfarm clients).
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NO_INSTALLCHECK = 1
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ifdef USE_PGXS |
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PG_CONFIG = pg_config
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PGXS := $(shell $(PG_CONFIG) --pgxs)
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include $(PGXS) |
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else |
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subdir = contrib/pg_logicalinspect
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top_builddir = ../..
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include $(top_builddir)/src/Makefile.global |
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include $(top_srcdir)/contrib/contrib-global.mk |
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endif |
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@ -0,0 +1,52 @@ |
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Parsed test spec with 2 sessions |
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starting permutation: s0_init s0_begin s0_savepoint s0_truncate s1_checkpoint s1_get_changes s0_commit s0_begin s0_insert s1_checkpoint s1_get_changes s0_commit s1_get_changes s1_get_logical_snapshot_info s1_get_logical_snapshot_meta |
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step s0_init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); |
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?column? |
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-------- |
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init |
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(1 row) |
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step s0_begin: BEGIN; |
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step s0_savepoint: SAVEPOINT sp1; |
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step s0_truncate: TRUNCATE tbl1; |
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step s1_checkpoint: CHECKPOINT; |
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step s1_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); |
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data |
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---- |
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(0 rows) |
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step s0_commit: COMMIT; |
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step s0_begin: BEGIN; |
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step s0_insert: INSERT INTO tbl1 VALUES (1); |
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step s1_checkpoint: CHECKPOINT; |
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step s1_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); |
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data |
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--------------------------------------- |
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BEGIN |
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table public.tbl1: TRUNCATE: (no-flags) |
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COMMIT |
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(3 rows) |
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step s0_commit: COMMIT; |
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step s1_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); |
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data |
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------------------------------------------------------------- |
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BEGIN |
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table public.tbl1: INSERT: val1[integer]:1 val2[integer]:null |
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COMMIT |
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(3 rows) |
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step s1_get_logical_snapshot_info: SELECT info.state, info.catchange_count, array_length(info.catchange_xip,1) AS catchange_array_length, info.committed_count, array_length(info.committed_xip,1) AS committed_array_length FROM pg_ls_logicalsnapdir(), pg_get_logical_snapshot_info(name) AS info ORDER BY 2; |
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state |catchange_count|catchange_array_length|committed_count|committed_array_length |
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----------+---------------+----------------------+---------------+---------------------- |
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consistent| 0| | 2| 2 |
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consistent| 2| 2| 0| |
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(2 rows) |
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step s1_get_logical_snapshot_meta: SELECT COUNT(meta.*) from pg_ls_logicalsnapdir(), pg_get_logical_snapshot_meta(name) as meta; |
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count |
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----- |
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2 |
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(1 row) |
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@ -0,0 +1 @@ |
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wal_level = logical |
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@ -0,0 +1,39 @@ |
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# Copyright (c) 2024, PostgreSQL Global Development Group |
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pg_logicalinspect_sources = files('pg_logicalinspect.c') |
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if host_system == 'windows' |
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pg_logicalinspect_sources += rc_lib_gen.process(win32ver_rc, extra_args: [ |
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'--NAME', 'pg_logicalinspect', |
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'--FILEDESC', 'pg_logicalinspect - functions to inspect logical decoding components',]) |
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endif |
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pg_logicalinspect = shared_module('pg_logicalinspect', |
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pg_logicalinspect_sources, |
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kwargs: contrib_mod_args + { |
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'dependencies': contrib_mod_args['dependencies'], |
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}, |
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) |
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contrib_targets += pg_logicalinspect |
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install_data( |
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'pg_logicalinspect.control', |
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'pg_logicalinspect--1.0.sql', |
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kwargs: contrib_data_args, |
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) |
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tests += { |
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'name': 'pg_logicalinspect', |
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'sd': meson.current_source_dir(), |
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'bd': meson.current_build_dir(), |
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'isolation': { |
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'specs': [ |
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'logical_inspect', |
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], |
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'regress_args': [ |
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'--temp-config', files('logicalinspect.conf'), |
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], |
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# see above |
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'runningcheck': false, |
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}, |
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} |
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@ -0,0 +1,43 @@ |
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/* contrib/pg_logicalinspect/pg_logicalinspect--1.0.sql */ |
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION |
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\echo Use "CREATE EXTENSION pg_logicalinspect" to load this file. \quit |
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-- |
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-- pg_get_logical_snapshot_meta() |
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-- |
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CREATE FUNCTION pg_get_logical_snapshot_meta(IN filename text, |
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OUT magic int4, |
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OUT checksum int8, |
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OUT version int4 |
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) |
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AS 'MODULE_PATHNAME', 'pg_get_logical_snapshot_meta' |
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LANGUAGE C STRICT PARALLEL SAFE; |
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REVOKE EXECUTE ON FUNCTION pg_get_logical_snapshot_meta(text) FROM PUBLIC; |
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GRANT EXECUTE ON FUNCTION pg_get_logical_snapshot_meta(text) TO pg_read_server_files; |
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-- |
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-- pg_get_logical_snapshot_info() |
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-- |
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CREATE FUNCTION pg_get_logical_snapshot_info(IN filename text, |
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OUT state text, |
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OUT xmin xid, |
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OUT xmax xid, |
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OUT start_decoding_at pg_lsn, |
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OUT two_phase_at pg_lsn, |
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OUT initial_xmin_horizon xid, |
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OUT building_full_snapshot boolean, |
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OUT in_slot_creation boolean, |
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OUT last_serialized_snapshot pg_lsn, |
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OUT next_phase_at xid, |
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OUT committed_count int4, |
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OUT committed_xip xid[], |
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OUT catchange_count int4, |
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OUT catchange_xip xid[] |
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) |
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AS 'MODULE_PATHNAME', 'pg_get_logical_snapshot_info' |
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LANGUAGE C STRICT PARALLEL SAFE; |
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REVOKE EXECUTE ON FUNCTION pg_get_logical_snapshot_info(text) FROM PUBLIC; |
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GRANT EXECUTE ON FUNCTION pg_get_logical_snapshot_info(text) TO pg_read_server_files; |
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@ -0,0 +1,167 @@ |
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/*-------------------------------------------------------------------------
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* |
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* pg_logicalinspect.c |
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* Functions to inspect contents of PostgreSQL logical snapshots |
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* |
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* Copyright (c) 2024, PostgreSQL Global Development Group |
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* |
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* IDENTIFICATION |
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* contrib/pg_logicalinspect/pg_logicalinspect.c |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include "funcapi.h" |
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#include "replication/snapbuild_internal.h" |
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#include "utils/array.h" |
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#include "utils/builtins.h" |
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#include "utils/pg_lsn.h" |
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PG_MODULE_MAGIC; |
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PG_FUNCTION_INFO_V1(pg_get_logical_snapshot_meta); |
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PG_FUNCTION_INFO_V1(pg_get_logical_snapshot_info); |
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/* Return the description of SnapBuildState */ |
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static const char * |
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get_snapbuild_state_desc(SnapBuildState state) |
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{ |
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const char *stateDesc = "unknown state"; |
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switch (state) |
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{ |
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case SNAPBUILD_START: |
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stateDesc = "start"; |
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break; |
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case SNAPBUILD_BUILDING_SNAPSHOT: |
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stateDesc = "building"; |
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break; |
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case SNAPBUILD_FULL_SNAPSHOT: |
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stateDesc = "full"; |
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break; |
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case SNAPBUILD_CONSISTENT: |
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stateDesc = "consistent"; |
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break; |
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} |
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return stateDesc; |
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} |
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/*
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* Retrieve the logical snapshot file metadata. |
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*/ |
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Datum |
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pg_get_logical_snapshot_meta(PG_FUNCTION_ARGS) |
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{ |
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#define PG_GET_LOGICAL_SNAPSHOT_META_COLS 3 |
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SnapBuildOnDisk ondisk; |
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HeapTuple tuple; |
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Datum values[PG_GET_LOGICAL_SNAPSHOT_META_COLS] = {0}; |
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bool nulls[PG_GET_LOGICAL_SNAPSHOT_META_COLS] = {0}; |
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TupleDesc tupdesc; |
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char path[MAXPGPATH]; |
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int i = 0; |
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text *filename_t = PG_GETARG_TEXT_PP(0); |
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/* Build a tuple descriptor for our result type */ |
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) |
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elog(ERROR, "return type must be a row type"); |
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sprintf(path, "%s/%s", |
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PG_LOGICAL_SNAPSHOTS_DIR, |
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text_to_cstring(filename_t)); |
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/* Validate and restore the snapshot to 'ondisk' */ |
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SnapBuildRestoreSnapshot(&ondisk, path, CurrentMemoryContext, false); |
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values[i++] = UInt32GetDatum(ondisk.magic); |
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values[i++] = Int64GetDatum((int64) ondisk.checksum); |
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values[i++] = UInt32GetDatum(ondisk.version); |
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Assert(i == PG_GET_LOGICAL_SNAPSHOT_META_COLS); |
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tuple = heap_form_tuple(tupdesc, values, nulls); |
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PG_RETURN_DATUM(HeapTupleGetDatum(tuple)); |
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#undef PG_GET_LOGICAL_SNAPSHOT_META_COLS |
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} |
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Datum |
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pg_get_logical_snapshot_info(PG_FUNCTION_ARGS) |
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{ |
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#define PG_GET_LOGICAL_SNAPSHOT_INFO_COLS 14 |
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SnapBuildOnDisk ondisk; |
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HeapTuple tuple; |
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Datum values[PG_GET_LOGICAL_SNAPSHOT_INFO_COLS] = {0}; |
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bool nulls[PG_GET_LOGICAL_SNAPSHOT_INFO_COLS] = {0}; |
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TupleDesc tupdesc; |
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char path[MAXPGPATH]; |
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int i = 0; |
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text *filename_t = PG_GETARG_TEXT_PP(0); |
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/* Build a tuple descriptor for our result type */ |
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) |
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elog(ERROR, "return type must be a row type"); |
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sprintf(path, "%s/%s", |
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PG_LOGICAL_SNAPSHOTS_DIR, |
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text_to_cstring(filename_t)); |
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/* Validate and restore the snapshot to 'ondisk' */ |
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SnapBuildRestoreSnapshot(&ondisk, path, CurrentMemoryContext, false); |
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values[i++] = CStringGetTextDatum(get_snapbuild_state_desc(ondisk.builder.state)); |
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values[i++] = TransactionIdGetDatum(ondisk.builder.xmin); |
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values[i++] = TransactionIdGetDatum(ondisk.builder.xmax); |
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values[i++] = LSNGetDatum(ondisk.builder.start_decoding_at); |
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values[i++] = LSNGetDatum(ondisk.builder.two_phase_at); |
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values[i++] = TransactionIdGetDatum(ondisk.builder.initial_xmin_horizon); |
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values[i++] = BoolGetDatum(ondisk.builder.building_full_snapshot); |
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values[i++] = BoolGetDatum(ondisk.builder.in_slot_creation); |
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values[i++] = LSNGetDatum(ondisk.builder.last_serialized_snapshot); |
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values[i++] = TransactionIdGetDatum(ondisk.builder.next_phase_at); |
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values[i++] = UInt32GetDatum(ondisk.builder.committed.xcnt); |
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if (ondisk.builder.committed.xcnt > 0) |
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{ |
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Datum *arrayelems; |
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arrayelems = (Datum *) palloc(ondisk.builder.committed.xcnt * sizeof(Datum)); |
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for (int j = 0; j < ondisk.builder.committed.xcnt; j++) |
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arrayelems[j] = TransactionIdGetDatum(ondisk.builder.committed.xip[j]); |
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values[i++] = PointerGetDatum(construct_array_builtin(arrayelems, |
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ondisk.builder.committed.xcnt, |
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XIDOID)); |
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} |
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else |
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nulls[i++] = true; |
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values[i++] = UInt32GetDatum(ondisk.builder.catchange.xcnt); |
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if (ondisk.builder.catchange.xcnt > 0) |
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{ |
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Datum *arrayelems; |
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arrayelems = (Datum *) palloc(ondisk.builder.catchange.xcnt * sizeof(Datum)); |
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for (int j = 0; j < ondisk.builder.catchange.xcnt; j++) |
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arrayelems[j] = TransactionIdGetDatum(ondisk.builder.catchange.xip[j]); |
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values[i++] = PointerGetDatum(construct_array_builtin(arrayelems, |
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ondisk.builder.catchange.xcnt, |
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XIDOID)); |
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} |
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else |
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nulls[i++] = true; |
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Assert(i == PG_GET_LOGICAL_SNAPSHOT_INFO_COLS); |
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tuple = heap_form_tuple(tupdesc, values, nulls); |
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PG_RETURN_DATUM(HeapTupleGetDatum(tuple)); |
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#undef PG_GET_LOGICAL_SNAPSHOT_INFO_COLS |
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} |
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@ -0,0 +1,5 @@ |
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# pg_logicalinspect extension |
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comment = 'functions to inspect logical decoding components' |
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default_version = '1.0' |
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module_pathname = '$libdir/pg_logicalinspect' |
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relocatable = true |
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# Test the pg_logicalinspect functions: that needs some permutation to |
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# ensure that we are creating multiple logical snapshots and that one of them |
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# contains ongoing catalogs changes. |
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setup |
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{ |
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DROP TABLE IF EXISTS tbl1; |
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CREATE TABLE tbl1 (val1 integer, val2 integer); |
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CREATE EXTENSION pg_logicalinspect; |
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} |
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teardown |
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{ |
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DROP TABLE tbl1; |
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SELECT 'stop' FROM pg_drop_replication_slot('isolation_slot'); |
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DROP EXTENSION pg_logicalinspect; |
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} |
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session "s0" |
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setup { SET synchronous_commit=on; } |
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step "s0_init" { SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); } |
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step "s0_begin" { BEGIN; } |
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step "s0_savepoint" { SAVEPOINT sp1; } |
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step "s0_truncate" { TRUNCATE tbl1; } |
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step "s0_insert" { INSERT INTO tbl1 VALUES (1); } |
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step "s0_commit" { COMMIT; } |
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session "s1" |
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setup { SET synchronous_commit=on; } |
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step "s1_checkpoint" { CHECKPOINT; } |
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step "s1_get_changes" { SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); } |
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step "s1_get_logical_snapshot_meta" { SELECT COUNT(meta.*) from pg_ls_logicalsnapdir(), pg_get_logical_snapshot_meta(name) as meta;} |
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step "s1_get_logical_snapshot_info" { SELECT info.state, info.catchange_count, array_length(info.catchange_xip,1) AS catchange_array_length, info.committed_count, array_length(info.committed_xip,1) AS committed_array_length FROM pg_ls_logicalsnapdir(), pg_get_logical_snapshot_info(name) AS info ORDER BY 2; } |
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permutation "s0_init" "s0_begin" "s0_savepoint" "s0_truncate" "s1_checkpoint" "s1_get_changes" "s0_commit" "s0_begin" "s0_insert" "s1_checkpoint" "s1_get_changes" "s0_commit" "s1_get_changes" "s1_get_logical_snapshot_info" "s1_get_logical_snapshot_meta" |
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@ -0,0 +1,143 @@ |
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<!-- doc/src/sgml/pglogicalinspect.sgml --> |
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<sect1 id="pglogicalinspect" xreflabel="pg_logicalinspect"> |
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<title>pg_logicalinspect — logical decoding components inspection</title> |
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|
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<indexterm zone="pglogicalinspect"> |
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<primary>pg_logicalinspect</primary> |
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</indexterm> |
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|
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<para> |
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The <filename>pg_logicalinspect</filename> module provides SQL functions |
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that allow you to inspect the contents of logical decoding components. It |
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allows the inspection of serialized logical snapshots of a running |
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<productname>PostgreSQL</productname> database cluster, which is useful |
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for debugging or educational purposes. |
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</para> |
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|
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<para> |
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By default, use of these functions is restricted to superusers and members of |
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the <literal>pg_read_server_files</literal> role. Access may be granted by |
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superusers to others using <command>GRANT</command>. |
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</para> |
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|
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<sect2 id="pglogicalinspect-funcs"> |
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<title>Functions</title> |
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|
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<variablelist> |
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<varlistentry id="pglogicalinspect-funcs-pg-get-logical-snapshot-meta"> |
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<term> |
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<function>pg_get_logical_snapshot_meta(filename text) returns record</function> |
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</term> |
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|
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<listitem> |
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<para> |
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Gets logical snapshot metadata about a snapshot file that is located in |
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the server's <filename>pg_logical/snapshots</filename> directory. |
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The <replaceable>filename</replaceable> argument represents the snapshot |
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file name. |
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For example: |
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<screen> |
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postgres=# SELECT * FROM pg_ls_logicalsnapdir(); |
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-[ RECORD 1 ]+----------------------- |
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name | 0-40796E18.snap |
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size | 152 |
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modification | 2024-08-14 16:36:32+00 |
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|
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postgres=# SELECT * FROM pg_get_logical_snapshot_meta('0-40796E18.snap'); |
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-[ RECORD 1 ]-------- |
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magic | 1369563137 |
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checksum | 1028045905 |
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version | 6 |
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|
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postgres=# SELECT ss.name, meta.* FROM pg_ls_logicalsnapdir() AS ss, |
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pg_get_logical_snapshot_meta(ss.name) AS meta; |
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-[ RECORD 1 ]------------- |
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name | 0-40796E18.snap |
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magic | 1369563137 |
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checksum | 1028045905 |
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version | 6 |
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</screen> |
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</para> |
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<para> |
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If <replaceable>filename</replaceable> does not match a snapshot file, the |
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function raises an error. |
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</para> |
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</listitem> |
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</varlistentry> |
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|
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<varlistentry id="pglogicalinspect-funcs-pg-get-logical-snapshot-info"> |
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<term> |
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<function>pg_get_logical_snapshot_info(filename text) returns record</function> |
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</term> |
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|
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<listitem> |
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<para> |
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Gets logical snapshot information about a snapshot file that is located in |
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the server's <filename>pg_logical/snapshots</filename> directory. |
||||
The <replaceable>filename</replaceable> argument represents the snapshot |
||||
file name. |
||||
For example: |
||||
<screen> |
||||
postgres=# SELECT * FROM pg_ls_logicalsnapdir(); |
||||
-[ RECORD 1 ]+----------------------- |
||||
name | 0-40796E18.snap |
||||
size | 152 |
||||
modification | 2024-08-14 16:36:32+00 |
||||
|
||||
postgres=# SELECT * FROM pg_get_logical_snapshot_info('0-40796E18.snap'); |
||||
-[ RECORD 1 ]------------+----------- |
||||
state | consistent |
||||
xmin | 751 |
||||
xmax | 751 |
||||
start_decoding_at | 0/40796AF8 |
||||
two_phase_at | 0/40796AF8 |
||||
initial_xmin_horizon | 0 |
||||
building_full_snapshot | f |
||||
in_slot_creation | f |
||||
last_serialized_snapshot | 0/0 |
||||
next_phase_at | 0 |
||||
committed_count | 0 |
||||
committed_xip | |
||||
catchange_count | 2 |
||||
catchange_xip | {751,752} |
||||
|
||||
postgres=# SELECT ss.name, info.* FROM pg_ls_logicalsnapdir() AS ss, |
||||
pg_get_logical_snapshot_info(ss.name) AS info; |
||||
-[ RECORD 1 ]------------+---------------- |
||||
name | 0-40796E18.snap |
||||
state | consistent |
||||
xmin | 751 |
||||
xmax | 751 |
||||
start_decoding_at | 0/40796AF8 |
||||
two_phase_at | 0/40796AF8 |
||||
initial_xmin_horizon | 0 |
||||
building_full_snapshot | f |
||||
in_slot_creation | f |
||||
last_serialized_snapshot | 0/0 |
||||
next_phase_at | 0 |
||||
committed_count | 0 |
||||
committed_xip | |
||||
catchange_count | 2 |
||||
catchange_xip | {751,752} |
||||
</screen> |
||||
</para> |
||||
<para> |
||||
If <replaceable>filename</replaceable> does not match a snapshot file, the |
||||
function raises an error. |
||||
</para> |
||||
</listitem> |
||||
</varlistentry> |
||||
|
||||
</variablelist> |
||||
</sect2> |
||||
|
||||
<sect2 id="pglogicalinspect-author"> |
||||
<title>Author</title> |
||||
|
||||
<para> |
||||
Bertrand Drouvot <email>bertranddrouvot.pg@gmail.com</email> |
||||
</para> |
||||
</sect2> |
||||
|
||||
</sect1> |
||||
Loading…
Reference in new issue