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Commit7750fef

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Add GUC for temporarily disabling event triggers
In order to troubleshoot misbehaving or buggy event triggers, thedocumented advice is to enter single-user mode. In an attempt toreduce the number of situations where single-user mode is required(or even recommended) for non-extraordinary maintenance, this GUCallows to temporarily suspend event triggers.This was originally extracted from a larger patchset which aimedat supporting event triggers on login events.Reviewed-by: Ted Yu <yuzhihong@gmail.com>Reviewed-by: Mikhail Gribkov <youzhick@gmail.com>Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>Reviewed-by: Michael Paquier <michael@paquier.xyzReviewed-by: Robert Haas <robertmhaas@gmail.com>Discussion:https://postgr.es/m/9140106E-F9BF-4D85-8FC8-F2D3C094A6D9@yesql.seDiscussion:https://postgr.es/m/0d46d29f-4558-3af9-9c85-7774e14a7709@postgrespro.ru
1 parentf19669f commit7750fef

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8 files changed

+98
-10
lines changed

8 files changed

+98
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lines changed

‎doc/src/sgml/config.sgml

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Original file line numberDiff line numberDiff line change
@@ -9425,6 +9425,25 @@ SET XML OPTION { DOCUMENT | CONTENT };
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</listitem>
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</varlistentry>
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<varlistentry id="guc-event-triggers" xreflabel="event_triggers">
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<term><varname>event_triggers</varname> (<type>boolean</type>)
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<indexterm>
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<primary><varname>event_triggers</varname></primary>
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<secondary>configuration parameter</secondary>
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</indexterm>
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</term>
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<listitem>
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<para>
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Allow temporarily disabling execution of event triggers in order to
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troubleshoot and repair faulty event triggers. All event triggers will
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be disabled by setting it to <literal>false</literal>. Setting the value
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to <literal>true</literal> allows all event triggers to fire, this
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is the default value. Only superusers and users with the appropriate
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<literal>SET</literal> privilege can change this setting.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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<sect2 id="runtime-config-client-format">

‎doc/src/sgml/ref/create_event_trigger.sgml

Lines changed: 6 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -121,9 +121,12 @@ CREATE EVENT TRIGGER <replaceable class="parameter">name</replaceable>
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<para>
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Event triggers are disabled in single-user mode (see <xref
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linkend="app-postgres"/>). If an erroneous event trigger disables the
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database so much that you can't even drop the trigger, restart in
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single-user mode and you'll be able to do that.
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linkend="app-postgres"/>) as well as when
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<xref linkend="guc-event-triggers"/> is set to <literal>false</literal>.
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If an erroneous event trigger disables the database so much that you can't
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even drop the trigger, restart with <xref linkend="guc-event-triggers"/>
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set to <literal>false</literal> to temporarily disable event triggers, or
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in single-user mode, and you'll be able to do that.
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</para>
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</refsect1>
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‎src/backend/commands/event_trigger.c

Lines changed: 13 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -72,6 +72,9 @@ typedef struct EventTriggerQueryState
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staticEventTriggerQueryState*currentEventTriggerState=NULL;
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/* GUC parameter */
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boolevent_triggers= true;
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/* Support for dropped objects */
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typedefstructSQLDropObject
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{
@@ -657,8 +660,11 @@ EventTriggerDDLCommandStart(Node *parsetree)
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* wherein event triggers are disabled. (Or we could implement
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* heapscan-and-sort logic for that case, but having disaster recovery
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* scenarios depend on code that's otherwise untested isn't appetizing.)
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*
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* Additionally, event triggers can be disabled with a superuser-only GUC
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* to make fixing database easier as per 1 above.
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*/
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if (!IsUnderPostmaster)
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if (!IsUnderPostmaster|| !event_triggers)
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return;
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runlist=EventTriggerCommonSetup(parsetree,
@@ -692,9 +698,9 @@ EventTriggerDDLCommandEnd(Node *parsetree)
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/*
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* See EventTriggerDDLCommandStart for a discussion about why event
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* triggers are disabled in single user mode.
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* triggers are disabled in single user mode or via GUC.
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*/
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if (!IsUnderPostmaster)
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if (!IsUnderPostmaster|| !event_triggers)
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return;
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/*
@@ -740,9 +746,9 @@ EventTriggerSQLDrop(Node *parsetree)
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/*
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* See EventTriggerDDLCommandStart for a discussion about why event
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* triggers are disabled in single user mode.
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* triggers are disabled in single user mode or via a GUC.
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*/
745-
if (!IsUnderPostmaster)
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if (!IsUnderPostmaster|| !event_triggers)
746752
return;
747753

748754
/*
@@ -811,9 +817,9 @@ EventTriggerTableRewrite(Node *parsetree, Oid tableOid, int reason)
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812818
/*
813819
* See EventTriggerDDLCommandStart for a discussion about why event
814-
* triggers are disabled in single user mode.
820+
* triggers are disabled in single user mode or via a GUC.
815821
*/
816-
if (!IsUnderPostmaster)
822+
if (!IsUnderPostmaster|| !event_triggers)
817823
return;
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819825
/*

‎src/backend/utils/misc/guc_tables.c

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Original file line numberDiff line numberDiff line change
@@ -37,6 +37,7 @@
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#include"catalog/namespace.h"
3838
#include"catalog/storage.h"
3939
#include"commands/async.h"
40+
#include"commands/event_trigger.h"
4041
#include"commands/tablespace.h"
4142
#include"commands/trigger.h"
4243
#include"commands/user.h"
@@ -2000,6 +2001,16 @@ struct config_bool ConfigureNamesBool[] =
20002001
NULL,NULL,NULL
20012002
},
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2004+
{
2005+
{"event_triggers",PGC_SUSET,CLIENT_CONN_STATEMENT,
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gettext_noop("Enables event triggers."),
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gettext_noop("When enabled, event triggers will fire for all applicable statements."),
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},
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&event_triggers,
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true,
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NULL,NULL,NULL
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},
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/* End-of-list marker */
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{
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{NULL,0,0,NULL,NULL},NULL, false,NULL,NULL,NULL

‎src/backend/utils/misc/postgresql.conf.sample

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@@ -706,6 +706,7 @@
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#xmloption = 'content'
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#gin_pending_list_limit = 4MB
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#createrole_self_grant = ''# set and/or inherit
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#event_triggers = on
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# - Locale and Formatting -
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‎src/include/commands/event_trigger.h

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Original file line numberDiff line numberDiff line change
@@ -29,6 +29,8 @@ typedef struct EventTriggerData
2929
CommandTagtag;
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}EventTriggerData;
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externPGDLLIMPORTboolevent_triggers;
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3234
#defineAT_REWRITE_ALTER_PERSISTENCE0x01
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#defineAT_REWRITE_DEFAULT_VAL0x02
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#defineAT_REWRITE_COLUMN_REWRITE0x04

‎src/test/regress/expected/event_trigger.out

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Original file line numberDiff line numberDiff line change
@@ -616,3 +616,25 @@ SELECT
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DROP EVENT TRIGGER start_rls_command;
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DROP EVENT TRIGGER end_rls_command;
618618
DROP EVENT TRIGGER sql_drop_command;
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-- Check the GUC for disabling event triggers
620+
CREATE FUNCTION test_event_trigger_guc() RETURNS event_trigger
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LANGUAGE plpgsql AS $$
622+
DECLARE
623+
obj record;
624+
BEGIN
625+
FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects()
626+
LOOP
627+
RAISE NOTICE '% dropped %', tg_tag, obj.object_type;
628+
END LOOP;
629+
END;
630+
$$;
631+
CREATE EVENT TRIGGER test_event_trigger_guc
632+
ON sql_drop
633+
WHEN TAG IN ('DROP POLICY') EXECUTE FUNCTION test_event_trigger_guc();
634+
SET event_triggers = 'on';
635+
CREATE POLICY pguc ON event_trigger_test USING (FALSE);
636+
DROP POLICY pguc ON event_trigger_test;
637+
NOTICE: DROP POLICY dropped policy
638+
CREATE POLICY pguc ON event_trigger_test USING (FALSE);
639+
SET event_triggers = 'off';
640+
DROP POLICY pguc ON event_trigger_test;

‎src/test/regress/sql/event_trigger.sql

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Original file line numberDiff line numberDiff line change
@@ -471,3 +471,27 @@ SELECT
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DROP EVENT TRIGGER start_rls_command;
472472
DROP EVENT TRIGGER end_rls_command;
473473
DROP EVENT TRIGGER sql_drop_command;
474+
475+
-- Check the GUC for disabling event triggers
476+
CREATEFUNCTIONtest_event_trigger_guc() RETURNS event_trigger
477+
LANGUAGE plpgsqlAS $$
478+
DECLARE
479+
obj record;
480+
BEGIN
481+
FOR objINSELECT*FROM pg_event_trigger_dropped_objects()
482+
LOOP
483+
RAISE NOTICE'% dropped %', tg_tag,obj.object_type;
484+
END LOOP;
485+
END;
486+
$$;
487+
CREATE EVENT TRIGGER test_event_trigger_guc
488+
ON sql_drop
489+
WHEN TAGIN ('DROP POLICY') EXECUTE FUNCTION test_event_trigger_guc();
490+
491+
SET event_triggers='on';
492+
CREATE POLICY pgucON event_trigger_test USING (FALSE);
493+
DROP POLICY pgucON event_trigger_test;
494+
495+
CREATE POLICY pgucON event_trigger_test USING (FALSE);
496+
SET event_triggers='off';
497+
DROP POLICY pgucON event_trigger_test;

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