client: update alloc status when terminating

Defensively update alloc status whenever killing all tasks.

client/allocrunner/alloc_runner.go

@@ -192,7 +192,18 @@ func (ar *allocRunner) Run() {
 	// destroyed and exit to wait for the AR to be GC'd by the client.
 	if !ar.shouldRun() {
 		ar.logger.Debug("not running terminal alloc")
-		ar.killTasks()
+
+		// Cleanup and sync state
+		states := ar.killTasks()
+
+		// Get the client allocation
+		calloc := ar.clientAlloc(states)
+
+		// Update the server
+		ar.stateUpdater.AllocStateUpdated(calloc)
+
+		// Broadcast client alloc to listeners
+		ar.allocBroadcaster.Send(calloc)
 		return
 	}
 
@@ -387,7 +398,7 @@ func (ar *allocRunner) handleTaskStateUpdates() {
 				ar.logger.Debug("task failure, destroying all tasks", "failed_task", killTask)
 			}
 
-			ar.killTasks()
+			states = ar.killTasks()
 		}
 
 		// Get the client allocation
@@ -402,8 +413,12 @@ func (ar *allocRunner) handleTaskStateUpdates() {
 }
 
 // killTasks kills all task runners, leader (if there is one) first. Errors are
-// logged except taskrunner.ErrTaskNotRunning which is ignored.
-func (ar *allocRunner) killTasks() {
+// logged except taskrunner.ErrTaskNotRunning which is ignored. Task states
+// after Kill has been called are returned.
+func (ar *allocRunner) killTasks() map[string]*structs.TaskState {
+	var mu sync.Mutex
+	states := make(map[string]*structs.TaskState, len(ar.tasks))
+
 	// Kill leader first, synchronously
 	for name, tr := range ar.tasks {
 		if !tr.IsLeader() {
@@ -414,6 +429,9 @@ func (ar *allocRunner) killTasks() {
 		if err != nil && err != taskrunner.ErrTaskNotRunning {
 			ar.logger.Warn("error stopping leader task", "error", err, "task_name", name)
 		}
+
+		state := tr.TaskState()
+		states[name] = state
 		break
 	}
 
@@ -431,9 +449,16 @@ func (ar *allocRunner) killTasks() {
 			if err != nil && err != taskrunner.ErrTaskNotRunning {
 				ar.logger.Warn("error stopping task", "error", err, "task_name", name)
 			}
+
+			state := tr.TaskState()
+			mu.Lock()
+			states[name] = state
+			mu.Unlock()
 		}(name, tr)
 	}
 	wg.Wait()
+
+	return states
 }
 
 // clientAlloc takes in the task states and returns an Allocation populated
@@ -602,8 +627,11 @@ func (ar *allocRunner) Destroy() {
 	}
 	defer ar.destroyedLock.Unlock()
 
-	// Stop any running tasks
-	ar.killTasks()
+	// Stop any running tasks and persist states in case the client is
+	// shutdown before Destroy finishes.
+	states := ar.killTasks()
+	calloc := ar.clientAlloc(states)
+	ar.stateUpdater.AllocStateUpdated(calloc)
 
 	// Wait for tasks to exit and postrun hooks to finish (if they ran at all)
 	if ar.runLaunched {