Fix invalid state transition on attempt to cancel (#817)

* Fix invalid state transition on attempt to cancel

Client channel implementation of close call registered cancel
handlers by iterating over all blocked receivers.  In the case
of Cancel this results in blocked receiver collection to be
modified during iteration which causes some handlers to be
called multiple times.
This fix clones the blocked receivers and uses the cloned copy
for iteration.  This guarantees that all callbacks are called
once irrespective of any modifications to the list of blocked
receivers during the iteration.

Also added new API to allow partial replay of history from
json file upto any specificed event ID.

* move ActivityCancelRepro test workflow to the end

internal/internal_workflow.go

@@ -715,7 +715,9 @@ func (c *channelImpl) sendAsyncImpl(v interface{}, pair *sendCallback) (ok bool)
 
 func (c *channelImpl) Close() {
 	c.closed = true
-	for _, callback := range c.blockedReceives {
+	// Use a copy of blockedReceives for iteration as invoking callback could result in modification
+	copy := append(c.blockedReceives[:0:0], c.blockedReceives...)
+	for _, callback := range copy {
 		callback.fn(nil, false)
 	}
 	// All blocked sends are going to panic

internal/worker.go

@@ -300,7 +300,16 @@ func ReplayWorkflowHistory(logger *zap.Logger, history *shared.History) error {
 // The logger is an optional parameter. Defaults to the noop logger.
 func ReplayWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string) error {
 
-	history, err := extractHistoryFromFile(jsonfileName)
+	return ReplayPartialWorkflowHistoryFromJSONFile(logger, jsonfileName, 0)
+}
+
+// ReplayWorkflowHistoryFromJSONFile executes a single decision task for the given json history file upto provided
+// lastEventID(inclusive).
+// Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger.
+// The logger is an optional parameter. Defaults to the noop logger.
+func ReplayPartialWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string, lastEventID int64) error {
+
+	history, err := extractHistoryFromFile(jsonfileName, lastEventID)
 
 	if err != nil {
 		return err
@@ -409,7 +418,7 @@ func replayWorkflowHistory(logger *zap.Logger, service workflowserviceclient.Int
 	return err
 }
 
-func extractHistoryFromFile(jsonfileName string) (*shared.History, error) {
+func extractHistoryFromFile(jsonfileName string, lastEventID int64) (*shared.History, error) {
 	raw, err := ioutil.ReadFile(jsonfileName)
 	if err != nil {
 		return nil, err
@@ -421,7 +430,21 @@ func extractHistoryFromFile(jsonfileName string) (*shared.History, error) {
 	if err != nil {
 		return nil, err
 	}
-	history := &shared.History{Events: deserializedEvents}
+
+	if lastEventID <= 0 {
+		return &shared.History{Events: deserializedEvents}, nil
+	}
+
+	// Caller is potentially asking for subset of history instead of all history events
+	events := []*shared.HistoryEvent{}
+	for _, event := range deserializedEvents {
+		events = append(events, event)
+		if event.GetEventId() == lastEventID {
+			// Copy history upto last event (inclusive)
+			break
+		}
+	}
+	history := &shared.History{Events: events}
 
 	return history, nil
 }

test/fixtures/activity.cancel.sm.repro.json

@@ -0,0 +1 @@
+[{"eventId":1,"timestamp":1563844217060613000,"eventType":"WorkflowExecutionStarted","version":-24,"workflowExecutionStartedEventAttributes":{"workflowType":{"name":"go.uber.org/cadence/test.(*Workflows).ActivityCancelRepro-fm"},"taskList":{"name":"tl-1"},"executionStartToCloseTimeoutSeconds":10,"taskStartToCloseTimeoutSeconds":1,"identity":"97228@samar-C02XG22GJGH6@"}},{"eventId":2,"timestamp":1563844217060620000,"eventType":"DecisionTaskScheduled","version":-24,"decisionTaskScheduledEventAttributes":{"taskList":{"name":"tl-1"},"startToCloseTimeoutSeconds":1,"attempt":0}},{"eventId":3,"timestamp":1563844217066914000,"eventType":"DecisionTaskStarted","version":-24,"decisionTaskStartedEventAttributes":{"scheduledEventId":2,"identity":"97228@samar-C02XG22GJGH6@tl-1","requestId":"9c612c81-6cd9-402d-866f-e5652e9c4823"}},{"eventId":4,"timestamp":1563844217073526000,"eventType":"DecisionTaskCompleted","version":-24,"decisionTaskCompletedEventAttributes":{"scheduledEventId":2,"startedEventId":3,"identity":"97228@samar-C02XG22GJGH6@tl-1"}},{"eventId":5,"timestamp":1563844217073598000,"eventType":"TimerStarted","version":-24,"timerStartedEventAttributes":{"timerId":"0","startToFireTimeoutSeconds":10,"decisionTaskCompletedEventId":4}},{"eventId":6,"timestamp":1563844217073620000,"eventType":"ActivityTaskScheduled","version":-24,"activityTaskScheduledEventAttributes":{"activityId":"1","activityType":{"name":"toUpperWithDelay"},"taskList":{"name":"tl-1"},"input":"ImhlbGxvIgo1MDAwMDAwMDAwCg==","scheduleToCloseTimeoutSeconds":10,"scheduleToStartTimeoutSeconds":10,"startToCloseTimeoutSeconds":9,"heartbeatTimeoutSeconds":0,"decisionTaskCompletedEventId":4}},{"eventId":7,"timestamp":1563844217073670000,"eventType":"ActivityTaskScheduled","version":-24,"activityTaskScheduledEventAttributes":{"activityId":"2","activityType":{"name":"toUpper"},"taskList":{"name":"bad_tl"},"input":"ImhlbGxvIgo=","scheduleToCloseTimeoutSeconds":10,"scheduleToStartTimeoutSeconds":10,"startToCloseTimeoutSeconds":9,"heartbeatTimeoutSeconds":0,"decisionTaskCompletedEventId":4}},{"eventId":8,"timestamp":1563844217073679000,"eventType":"ActivityTaskScheduled","version":-24,"activityTaskScheduledEventAttributes":{"activityId":"3","activityType":{"name":"toUpper"},"taskList":{"name":"bad_tl"},"input":"ImhlbGxvIgo=","scheduleToCloseTimeoutSeconds":10,"scheduleToStartTimeoutSeconds":10,"startToCloseTimeoutSeconds":9,"heartbeatTimeoutSeconds":0,"decisionTaskCompletedEventId":4}},{"eventId":9,"timestamp":1563844217080804000,"eventType":"ActivityTaskStarted","version":-24,"activityTaskStartedEventAttributes":{"scheduledEventId":6,"identity":"97228@samar-C02XG22GJGH6@tl-1","requestId":"8b1ab5fd-5f15-4867-af33-97a7b00da341","attempt":0}},{"eventId":10,"timestamp":1563844222089088000,"eventType":"ActivityTaskCompleted","version":-24,"activityTaskCompletedEventAttributes":{"result":"IkhFTExPIgo=","scheduledEventId":6,"startedEventId":9,"identity":"97228@samar-C02XG22GJGH6@tl-1"}},{"eventId":11,"timestamp":1563844222089104000,"eventType":"DecisionTaskScheduled","version":-24,"decisionTaskScheduledEventAttributes":{"taskList":{"name":"tl-1"},"startToCloseTimeoutSeconds":1,"attempt":0}},{"eventId":12,"timestamp":1563844222096052000,"eventType":"DecisionTaskStarted","version":-24,"decisionTaskStartedEventAttributes":{"scheduledEventId":11,"identity":"97228@samar-C02XG22GJGH6@tl-1","requestId":"89f09b7a-2f34-497f-b3c4-99ede5efaf30"}},{"eventId":13,"timestamp":1563844222102892000,"eventType":"DecisionTaskFailed","version":-24,"decisionTaskFailedEventAttributes":{"scheduledEventId":11,"startedEventId":12,"cause":"WORKFLOW_WORKER_UNHANDLED_FAILURE","details":"aW52YWxpZCBzdGF0ZSB0cmFuc2l0aW9uOiBhdHRlbXB0IHRvIGNhbmNlbCwgRGVjaXNpb25UeXBlOiBBY3Rpdml0eSwgSUQ6IDMsIHN0YXRlPUNhbmNlbGVkQWZ0ZXJJbml0aWF0ZWQsIGlzRG9uZSgpPWZhbHNlLCBoaXN0b3J5PVtDcmVhdGVkIGhhbmRsZURlY2lzaW9uU2VudCBEZWNpc2lvblNlbnQgaGFuZGxlSW5pdGlhdGVkRXZlbnQgSW5pdGlhdGVkIGNhbmNlbCBDYW5jZWxlZEFmdGVySW5pdGlhdGVkXQ==","identity":"97228@samar-C02XG22GJGH6@tl-1"}},{"eventId":14,"timestamp":1563844227061245000,"eventType":"WorkflowExecutionTimedOut","version":-24,"workflowExecutionTimedOutEventAttributes":{"timeoutType":"START_TO_CLOSE"}}]

test/integration_test.go

@@ -274,6 +274,19 @@ func (ts *IntegrationTestSuite) TestChildWFWithMemoAndSearchAttributes() {
 	ts.Equal("memoVal, searchAttrVal", result)
 }
 
+func (ts *IntegrationTestSuite) TestActivityCancelUsingReplay() {
+	logger, err := zap.NewDevelopment()
+	err = worker.ReplayPartialWorkflowHistoryFromJSONFile(logger, "fixtures/activity.cancel.sm.repro.json", 12)
+	ts.Nil(err)
+}
+
+func (ts *IntegrationTestSuite) TestActivityCancelRepro() {
+	var expected []string
+	err := ts.executeWorkflow("test-activity-cancel-sm", ts.workflows.ActivityCancelRepro, &expected)
+	ts.Nil(err)
+	ts.EqualValues(expected, ts.activities.invoked())
+}
+
 func (ts *IntegrationTestSuite) registerDomain() {
 	client := client.NewDomainClient(ts.rpcClient.Interface, &client.Options{})
 	ctx, cancel := context.WithTimeout(context.Background(), ctxTimeout)

test/workflow_test.go

@@ -293,6 +293,69 @@ func (w *Workflows) ChildWorkflowSuccess(ctx workflow.Context) (result string, e
 	return
 }
 
+func (w *Workflows) ActivityCancelRepro(ctx workflow.Context) ([]string, error) {
+	ctx, cancelFunc := workflow.WithCancel(ctx)
+
+	// First go-routine which triggers cancellation on completion of first activity
+	workflow.Go(ctx, func(ctx1 workflow.Context) {
+		activityCtx := workflow.WithActivityOptions(ctx1, workflow.ActivityOptions{
+			ScheduleToStartTimeout: 10 * time.Second,
+			ScheduleToCloseTimeout: 10 * time.Second,
+			StartToCloseTimeout:    9 * time.Second,
+		})
+
+		activityF := workflow.ExecuteActivity(activityCtx, "toUpperWithDelay", "hello", 1 * time.Second)
+		var ans string
+		err := activityF.Get(activityCtx, &ans)
+		if err != nil {
+			workflow.GetLogger(activityCtx).Sugar().Infof("Activity Failed: Err: %v", err)
+			return
+		}
+
+		// Trigger cancellation of root context
+		cancelFunc()
+	})
+
+	// Second go-routine which get blocked on ActivitySchedule and not started
+	workflow.Go(ctx, func(ctx1 workflow.Context) {
+		activityCtx := workflow.WithActivityOptions(ctx1, workflow.ActivityOptions{
+			ScheduleToStartTimeout: 10 * time.Second,
+			ScheduleToCloseTimeout: 10 * time.Second,
+			StartToCloseTimeout:    1 * time.Second,
+			TaskList:               "bad_tl",
+		})
+
+		activityF := workflow.ExecuteActivity(activityCtx, "toUpper", "hello")
+		var ans string
+		err := activityF.Get(activityCtx, &ans)
+		if err != nil {
+			workflow.GetLogger(activityCtx).Sugar().Infof("Activity Failed: Err: %v", err)
+		}
+	})
+
+	// Third go-routine which get blocked on ActivitySchedule and not started
+	workflow.Go(ctx, func(ctx1 workflow.Context) {
+		activityCtx := workflow.WithActivityOptions(ctx1, workflow.ActivityOptions{
+			ScheduleToStartTimeout: 10 * time.Second,
+			ScheduleToCloseTimeout: 10 * time.Second,
+			StartToCloseTimeout:    1 * time.Second,
+			TaskList:               "bad_tl",
+		})
+
+		activityF := workflow.ExecuteActivity(activityCtx, "toUpper", "hello")
+		var ans string
+		err := activityF.Get(activityCtx, &ans)
+		if err != nil {
+			workflow.GetLogger(activityCtx).Sugar().Infof("Activity Failed: Err: %v", err)
+		}
+	})
+
+	// Cause the workflow to block on sleep
+	workflow.Sleep(ctx, 10 * time.Second)
+
+	return []string{"toUpperWithDelay"}, nil
+}
+
 func (w *Workflows) child(ctx workflow.Context, arg string, mustFail bool) (string, error) {
 	var result string
 	ctx = workflow.WithActivityOptions(ctx, w.defaultActivityOptions())
@@ -339,6 +402,7 @@ func (w *Workflows) register() {
 	workflow.Register(w.sleep)
 	workflow.Register(w.child)
 	workflow.Register(w.childForMemoAndSearchAttr)
+	workflow.Register(w.ActivityCancelRepro)
 }
 
 func (w *Workflows) defaultActivityOptions() workflow.ActivityOptions {

worker/worker.go

@@ -97,6 +97,16 @@ func ReplayWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string)
 	return internal.ReplayWorkflowHistoryFromJSONFile(logger, jsonfileName)
 }
 
+// ReplayPartialWorkflowHistoryFromJSONFile executes a single decision task for the json history file upto provided
+//// lastEventID(inclusive), downloaded from the cli.
+// To download the history file: cadence workflow showid <workflow_id> -of <output_filename>
+// See https://github.com/uber/cadence/blob/master/tools/cli/README.md for full documentation
+// Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger.
+// The logger is an optional parameter. Defaults to the noop logger.
+func ReplayPartialWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string, lastEventID int64) error {
+	return internal.ReplayPartialWorkflowHistoryFromJSONFile(logger, jsonfileName, lastEventID)
+}
+
 // ReplayWorkflowExecution loads a workflow execution history from the Cadence service and executes a single decision task for it.
 // Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger.
 // The logger is the only optional parameter. Defaults to the noop logger.