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pg_event_trigger_dropped_objects: add behavior flags 

Add "normal" and "original" flags as output columns to the
pg_event_trigger_dropped_objects() function.  With this it's possible to
distinguish which objects, among those listed, need to be explicitely
referenced when trying to replicate a deletion.

This is necessary so that the list of objects can be pruned to the
minimum necessary to replicate the DROP command in a remote server that
might have slightly different schema (for instance, TOAST tables and
constraints with different names and such.)

Catalog version bumped due to change of function definition.

Reviewed by: Abhijit Menon-Sen, Stephen Frost, Heikki Linnakangas,
Robert Haas.
This commit is contained in:
Alvaro Herrera 2014-12-19 15:00:45 -03:00
parent 5c805d0a81
commit 0ee98d1cbf
8 changed files with 114 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
doc/src/sgml/func.sgml
View File

@ -17729,6 +17729,19 @@ FOR EACH ROW EXECUTE PROCEDURE suppress_redundant_updates_trigger();
<entry><type>int32</type></entry>
<entry>Object sub-id (e.g. attribute number for columns)</entry>
</row>
<row>
<entry><literal>original</literal></entry>
<entry><type>bool</type></entry>
<entry>Flag used to identify the root object(s) of the deletion</entry>
</row>
<row>
<entry><literal>normal</literal></entry>
<entry><type>bool</type></entry>
<entry>
Flag indicating that there's a normal dependency relationship
in the dependency graph leading to this object
</entry>
</row>
<row>
<entry><literal>object_type</literal></entry>
<entry><type>text</type></entry>

19
src/backend/catalog/dependency.c
View File

@ -206,16 +206,25 @@ deleteObjectsInList(ObjectAddresses *targetObjects, Relation *depRel,
/*
* Keep track of objects for event triggers, if necessary.
*/
if (trackDroppedObjectsNeeded())
if (trackDroppedObjectsNeeded() && !(flags & PERFORM_DELETION_INTERNAL))
{
for (i = 0; i < targetObjects->numrefs; i++)
{
ObjectAddress *thisobj = targetObjects->refs + i;
const ObjectAddress *thisobj = &targetObjects->refs[i];
const ObjectAddressExtra *extra = &targetObjects->extras[i];
bool original = false;
bool normal = false;
if ((!(flags & PERFORM_DELETION_INTERNAL)) &&
EventTriggerSupportsObjectClass(getObjectClass(thisobj)))
if (extra->flags & DEPFLAG_ORIGINAL)
original = true;
if (extra->flags & DEPFLAG_NORMAL)
normal = true;
if (extra->flags & DEPFLAG_REVERSE)
normal = true;
if (EventTriggerSupportsObjectClass(getObjectClass(thisobj)))
{
EventTriggerSQLDropAddObject(thisobj);
EventTriggerSQLDropAddObject(thisobj, original, normal);
}
}
}

16
src/backend/commands/event_trigger.c
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@ -117,6 +117,8 @@ typedef struct SQLDropObject
const char *objname;
const char *objidentity;
const char *objecttype;
bool original;
bool normal;
slist_node next;
} SQLDropObject;
@ -1238,7 +1240,7 @@ trackDroppedObjectsNeeded(void)
* Register one object as being dropped by the current command.
*/
void
EventTriggerSQLDropAddObject(ObjectAddress *object)
EventTriggerSQLDropAddObject(const ObjectAddress *object, bool original, bool normal)
{
SQLDropObject *obj;
MemoryContext oldcxt;
@ -1257,6 +1259,8 @@ EventTriggerSQLDropAddObject(ObjectAddress *object)
obj = palloc0(sizeof(SQLDropObject));
obj->address = *object;
obj->original = original;
obj->normal = normal;
/*
* Obtain schema names from the object's catalog tuple, if one exists;
@ -1384,8 +1388,8 @@ pg_event_trigger_dropped_objects(PG_FUNCTION_ARGS)
{
SQLDropObject *obj;
int i = 0;
Datum values[7];
bool nulls[7];
Datum values[9];
bool nulls[9];
obj = slist_container(SQLDropObject, next, iter.cur);
@ -1401,6 +1405,12 @@ pg_event_trigger_dropped_objects(PG_FUNCTION_ARGS)
/* objsubid */
values[i++] = Int32GetDatum(obj->address.objectSubId);
/* original */
values[i++] = BoolGetDatum(obj->original);
/* normal */
values[i++] = BoolGetDatum(obj->normal);
/* object_type */
values[i++] = CStringGetTextDatum(obj->objecttype);

2
src/include/catalog/catversion.h
View File

@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201412122
#define CATALOG_VERSION_NO 201412191
#endif

2
src/include/catalog/pg_proc.h
View File

@ -5075,7 +5075,7 @@ DATA(insert OID = 3785 ( pg_logical_slot_peek_binary_changes PGNSP PGUID 12 100
DESCR("peek at binary changes from replication slot");
/* event triggers */
DATA(insert OID = 3566 ( pg_event_trigger_dropped_objects PGNSP PGUID 12 10 100 0 0 f f f f t t s 0 0 2249 "" "{26,26,23,25,25,25,25}" "{o,o,o,o,o,o,o}" "{classid, objid, objsubid, object_type, schema_name, object_name, object_identity}" _null_ pg_event_trigger_dropped_objects _null_ _null_ _null_ ));
DATA(insert OID = 3566 ( pg_event_trigger_dropped_objects PGNSP PGUID 12 10 100 0 0 f f f f t t s 0 0 2249 "" "{26,26,23,16,16,25,25,25,25}" "{o,o,o,o,o,o,o,o,o}" "{classid, objid, objsubid, original, normal, object_type, schema_name, object_name, object_identity}" _null_ pg_event_trigger_dropped_objects _null_ _null_ _null_ ));
DESCR("list objects dropped by the current command");
DATA(insert OID = 4566 ( pg_event_trigger_table_rewrite_oid PGNSP PGUID 12 1 0 0 0 f f f f t f s 0 0 26 "" "{26}" "{o}" "{oid}" _null_ pg_event_trigger_table_rewrite_oid _null_ _null_ _null_ ));
DESCR("return Oid of the table getting rewritten");

3
src/include/commands/event_trigger.h
View File

@ -56,6 +56,7 @@ extern void EventTriggerTableRewrite(Node *parsetree, Oid tableOid, int reason);
extern bool EventTriggerBeginCompleteQuery(void);
extern void EventTriggerEndCompleteQuery(void);
extern bool trackDroppedObjectsNeeded(void);
extern void EventTriggerSQLDropAddObject(ObjectAddress *object);
extern void EventTriggerSQLDropAddObject(const ObjectAddress *object,
bool original, bool normal);
#endif /* EVENT_TRIGGER_H */

40
src/test/regress/expected/event_trigger.out
View File

@ -294,6 +294,46 @@ SELECT * FROM dropped_objects WHERE type = 'schema';
DROP ROLE regression_bob;
DROP EVENT TRIGGER regress_event_trigger_drop_objects;
DROP EVENT TRIGGER undroppable;
CREATE OR REPLACE FUNCTION event_trigger_report_dropped()
RETURNS event_trigger
LANGUAGE plpgsql
AS $$
DECLARE r record;
BEGIN
FOR r IN SELECT * from pg_event_trigger_dropped_objects()
LOOP
IF NOT r.normal AND NOT r.original THEN
CONTINUE;
END IF;
RAISE NOTICE 'NORMAL: orig=% normal=% type=% identity=%',
r.original, r.normal, r.object_type, r.object_identity;
END LOOP;
END; $$;
CREATE EVENT TRIGGER regress_event_trigger_report_dropped ON sql_drop
EXECUTE PROCEDURE event_trigger_report_dropped();
CREATE SCHEMA evttrig
CREATE TABLE one (col_a SERIAL PRIMARY KEY, col_b text DEFAULT 'forty two')
CREATE INDEX one_idx ON one (col_b)
CREATE TABLE two (col_c INTEGER CHECK (col_c > 0) REFERENCES one DEFAULT 42);
ALTER TABLE evttrig.two DROP COLUMN col_c;
NOTICE: NORMAL: orig=t normal=f type=table column identity=evttrig.two.col_c
NOTICE: NORMAL: orig=f normal=t type=table constraint identity=two_col_c_check on evttrig.two
ALTER TABLE evttrig.one ALTER COLUMN col_b DROP DEFAULT;
NOTICE: NORMAL: orig=t normal=f type=default value identity=for evttrig.one.col_b
ALTER TABLE evttrig.one DROP CONSTRAINT one_pkey;
NOTICE: NORMAL: orig=t normal=f type=table constraint identity=one_pkey on evttrig.one
DROP INDEX evttrig.one_idx;
NOTICE: NORMAL: orig=t normal=f type=index identity=evttrig.one_idx
DROP SCHEMA evttrig CASCADE;
NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table evttrig.one
drop cascades to table evttrig.two
NOTICE: NORMAL: orig=t normal=f type=schema identity=evttrig
NOTICE: NORMAL: orig=f normal=t type=table identity=evttrig.one
NOTICE: NORMAL: orig=f normal=t type=sequence identity=evttrig.one_col_a_seq
NOTICE: NORMAL: orig=f normal=t type=default value identity=for evttrig.one.col_a
NOTICE: NORMAL: orig=f normal=t type=table identity=evttrig.two
DROP EVENT TRIGGER regress_event_trigger_report_dropped;
-- only allowed from within an event trigger function, should fail
select pg_event_trigger_table_rewrite_oid();
ERROR: pg_event_trigger_table_rewrite_oid() can only be called in a table_rewrite event trigger function

30
src/test/regress/sql/event_trigger.sql
View File

@ -207,6 +207,36 @@ DROP ROLE regression_bob;
DROP EVENT TRIGGER regress_event_trigger_drop_objects;
DROP EVENT TRIGGER undroppable;
CREATE OR REPLACE FUNCTION event_trigger_report_dropped()
RETURNS event_trigger
LANGUAGE plpgsql
AS $$
DECLARE r record;
BEGIN
FOR r IN SELECT * from pg_event_trigger_dropped_objects()
LOOP
IF NOT r.normal AND NOT r.original THEN
CONTINUE;
END IF;
RAISE NOTICE 'NORMAL: orig=% normal=% type=% identity=%',
r.original, r.normal, r.object_type, r.object_identity;
END LOOP;
END; $$;
CREATE EVENT TRIGGER regress_event_trigger_report_dropped ON sql_drop
EXECUTE PROCEDURE event_trigger_report_dropped();
CREATE SCHEMA evttrig
CREATE TABLE one (col_a SERIAL PRIMARY KEY, col_b text DEFAULT 'forty two')
CREATE INDEX one_idx ON one (col_b)
CREATE TABLE two (col_c INTEGER CHECK (col_c > 0) REFERENCES one DEFAULT 42);
ALTER TABLE evttrig.two DROP COLUMN col_c;
ALTER TABLE evttrig.one ALTER COLUMN col_b DROP DEFAULT;
ALTER TABLE evttrig.one DROP CONSTRAINT one_pkey;
DROP INDEX evttrig.one_idx;
DROP SCHEMA evttrig CASCADE;
DROP EVENT TRIGGER regress_event_trigger_report_dropped;
-- only allowed from within an event trigger function, should fail
select pg_event_trigger_table_rewrite_oid();