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Add pg_trigger_depth() function

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This reports the depth level of triggers currently in execution, or zero
if not called from inside a trigger.

No catversion bump in this patch, but you have to initdb if you want
access to the new function.

Author: Kevin Grittner
This commit is contained in:
Alvaro Herrera
2012-01-25 13:15:29 -03:00
parent 6d5aae7afa
commit 74ab96a45e
6 changed files with 213 additions and 1 deletions
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21
src/backend/commands/trigger.c
View File

@ -59,6 +59,8 @@
/* GUC variables */
int SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
/* How many levels deep into trigger execution are we? */
static int MyTriggerDepth = 0;
#define GetModifiedColumns(relinfo, estate) \
(rt_fetch((relinfo)->ri_RangeTableIndex, (estate)->es_range_table)->modifiedCols)
@ -1838,7 +1840,18 @@ ExecCallTriggerFunc(TriggerData *trigdata,
pgstat_init_function_usage(&fcinfo, &fcusage);
result = FunctionCallInvoke(&fcinfo);
MyTriggerDepth++;
PG_TRY();
{
result = FunctionCallInvoke(&fcinfo);
}
PG_CATCH();
{
MyTriggerDepth--;
PG_RE_THROW();
}
PG_END_TRY();
MyTriggerDepth--;
pgstat_end_function_usage(&fcusage, true);
@ -4632,3 +4645,9 @@ AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
&new_event, &new_shared);
}
}
Datum
pg_trigger_depth(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(MyTriggerDepth);
}