Delete snaphost when task is deleted

CHANGELOG.md

@@ -11,6 +11,7 @@
 - [#783](https://github.com/influxdata/kapacitor/pull/783): Fix panic when revoking tokens not already defined.
 - [#784](https://github.com/influxdata/kapacitor/pull/784): Fix several issues with comment formatting in TICKscript.
 
+- [#772](https://github.com/influxdata/kapacitor/issues/772): Delete task snapshot data when a task is deleted.
 
 ## v1.0.0-beta4 [2016-07-27]
 

services/task_store/dao.go

@@ -78,10 +78,12 @@ type TemplateDAO interface {
 // Data access object for Snapshot data.
 type SnapshotDAO interface {
 	// Load a saved snapshot.
-	// ErrNoSnapshotExists will be returned if HasSnapshot returns false.
+	// ErrNoSnapshotExists will be returned if the snapshot does not exist.
 	Get(id string) (*Snapshot, error)
 	// Save a snapshot.
 	Put(id string, snapshot *Snapshot) error
+	// Delete a snapshot
+	Delete(id string) error
 	// Whether a snapshot exists in the store.
 	Exists(id string) (bool, error)
 }
@@ -563,6 +565,11 @@ func (d *snapshotKV) Put(id string, snapshot *Snapshot) error {
 	return d.store.Put(key, data)
 }
 
+func (d *snapshotKV) Delete(id string) error {
+	key := d.snapshotDataKey(id)
+	return d.store.Delete(key)
+}
+
 func (d *snapshotKV) Exists(id string) (bool, error) {
 	key := d.snapshotDataKey(id)
 	return d.store.Exists(key)

services/task_store/service.go

@@ -1301,6 +1301,10 @@ func (ts *Service) handleDeleteTask(w http.ResponseWriter, r *http.Request) {
 }
 
 func (ts *Service) deleteTask(id string) error {
+	// Delete associated snapshot
+	ts.snapshots.Delete(id)
+
+	// Delete task object
 	task, err := ts.tasks.Get(id)
 	if err != nil {
 		if err == ErrNoTaskExists {