[PATCH 08/10] ddl: don't use txn_last_stmt on _trigger commit/rollback
Vladimir Davydov
vdavydov.dev at gmail.com
Wed Jul 3 22:30:10 MSK 2019
When we implement transactional DDL, txn_last_stmt won't necessarily
point to the right statement on commit or rollback so we must avoid
using it.
---
src/box/alter.cc | 84 +++++++++++++++++++++++++++++++-------------------------
1 file changed, 47 insertions(+), 37 deletions(-)
diff --git a/src/box/alter.cc b/src/box/alter.cc
index 071258b7..3ddddabb 100644
--- a/src/box/alter.cc
+++ b/src/box/alter.cc
@@ -3720,45 +3720,50 @@ lock_before_dd(struct trigger *trigger, void *event)
latch_lock(&schema_lock);
}
+/** Delete the new trigger on rollback of an INSERT statement. */
+static void
+on_create_trigger_rollback(struct trigger *trigger, void * /* event */)
+{
+ struct sql_trigger *old_trigger = (struct sql_trigger *)trigger->data;
+ struct sql_trigger *new_trigger;
+ int rc = sql_trigger_replace(sql_trigger_name(old_trigger),
+ sql_trigger_space_id(old_trigger),
+ NULL, &new_trigger);
+ (void)rc;
+ assert(rc == 0);
+ assert(new_trigger == old_trigger);
+ sql_trigger_delete(sql_get(), new_trigger);
+}
+
+/** Restore the old trigger on rollback of a DELETE statement. */
+static void
+on_drop_trigger_rollback(struct trigger *trigger, void * /* event */)
+{
+ struct sql_trigger *old_trigger = (struct sql_trigger *)trigger->data;
+ struct sql_trigger *new_trigger;
+ if (old_trigger == NULL)
+ return;
+ if (sql_trigger_replace(sql_trigger_name(old_trigger),
+ sql_trigger_space_id(old_trigger),
+ old_trigger, &new_trigger) != 0)
+ panic("Out of memory on insertion into trigger hash");
+ assert(new_trigger == NULL);
+}
+
/**
- * Trigger invoked on rollback in the _trigger space.
- * Since rollback trigger is invoked after insertion to hash and space,
- * we have to delete it from those structures and release memory.
- * Vice versa, after deletion of trigger we must return it back to hash and space*.
+ * Restore the old trigger and delete the new trigger on rollback
+ * of a REPLACE statement.
*/
static void
-on_replace_trigger_rollback(struct trigger *trigger, void *event)
+on_replace_trigger_rollback(struct trigger *trigger, void * /* event */)
{
- struct txn_stmt *stmt = txn_last_stmt((struct txn*) event);
struct sql_trigger *old_trigger = (struct sql_trigger *)trigger->data;
struct sql_trigger *new_trigger;
-
- if (stmt->old_tuple != NULL && stmt->new_tuple == NULL) {
- /* Rollback DELETE trigger. */
- if (old_trigger == NULL)
- return;
- if (sql_trigger_replace(sql_trigger_name(old_trigger),
- sql_trigger_space_id(old_trigger),
- old_trigger, &new_trigger) != 0)
- panic("Out of memory on insertion into trigger hash");
- assert(new_trigger == NULL);
- } else if (stmt->new_tuple != NULL && stmt->old_tuple == NULL) {
- /* Rollback INSERT trigger. */
- int rc = sql_trigger_replace(sql_trigger_name(old_trigger),
- sql_trigger_space_id(old_trigger),
- NULL, &new_trigger);
- (void)rc;
- assert(rc == 0);
- assert(new_trigger == old_trigger);
- sql_trigger_delete(sql_get(), new_trigger);
- } else {
- /* Rollback REPLACE trigger. */
- if (sql_trigger_replace(sql_trigger_name(old_trigger),
- sql_trigger_space_id(old_trigger),
- old_trigger, &new_trigger) != 0)
- panic("Out of memory on insertion into trigger hash");
- sql_trigger_delete(sql_get(), new_trigger);
- }
+ if (sql_trigger_replace(sql_trigger_name(old_trigger),
+ sql_trigger_space_id(old_trigger),
+ old_trigger, &new_trigger) != 0)
+ panic("Out of memory on insertion into trigger hash");
+ sql_trigger_delete(sql_get(), new_trigger);
}
/**
@@ -3785,8 +3790,7 @@ on_replace_dd_trigger(struct trigger * /* trigger */, void *event)
struct tuple *old_tuple = stmt->old_tuple;
struct tuple *new_tuple = stmt->new_tuple;
- struct trigger *on_rollback =
- txn_alter_trigger_new(on_replace_trigger_rollback, NULL);
+ struct trigger *on_rollback = txn_alter_trigger_new(NULL, NULL);
struct trigger *on_commit =
txn_alter_trigger_new(on_replace_trigger_commit, NULL);
@@ -3813,6 +3817,7 @@ on_replace_dd_trigger(struct trigger * /* trigger */, void *event)
on_commit->data = old_trigger;
on_rollback->data = old_trigger;
+ on_rollback->run = on_drop_trigger_rollback;
} else {
/* INSERT, REPLACE trigger. */
uint32_t trigger_name_len;
@@ -3860,8 +3865,13 @@ on_replace_dd_trigger(struct trigger * /* trigger */, void *event)
diag_raise();
on_commit->data = old_trigger;
- on_rollback->data =
- old_tuple == NULL ? new_trigger : old_trigger;
+ if (old_tuple != NULL) {
+ on_rollback->data = old_trigger;
+ on_rollback->run = on_replace_trigger_rollback;
+ } else {
+ on_rollback->data = new_trigger;
+ on_rollback->run = on_create_trigger_rollback;
+ }
new_trigger_guard.is_active = false;
}
--
2.11.0
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