IWF-124: Ignore empty output for collector

service/interpreter/InternalChannel.go

@@ -0,0 +1,57 @@
+package interpreter
+
+import "github.com/indeedeng/iwf/gen/iwfidl"
+
+type InternalChannel struct {
+	// key is channel name
+	receivedData map[string][]*iwfidl.EncodedObject
+}
+
+func NewInterStateChannel() *InternalChannel {
+	return &InternalChannel{
+		receivedData: map[string][]*iwfidl.EncodedObject{},
+	}
+}
+
+func RebuildInterStateChannel(refill map[string][]*iwfidl.EncodedObject) *InternalChannel {
+	return &InternalChannel{
+		receivedData: refill,
+	}
+}
+
+func (i *InternalChannel) DumpReceived() map[string][]*iwfidl.EncodedObject {
+	return i.receivedData
+}
+
+func (i *InternalChannel) HasData(channelName string) bool {
+	l := i.receivedData[channelName]
+	return len(l) > 0
+}
+
+func (i *InternalChannel) ProcessPublishing(publishes []iwfidl.InterStateChannelPublishing) {
+	for _, pub := range publishes {
+		i.receive(pub.ChannelName, pub.Value)
+	}
+}
+
+func (i *InternalChannel) receive(channelName string, data *iwfidl.EncodedObject) {
+	l := i.receivedData[channelName]
+	l = append(l, data)
+	i.receivedData[channelName] = l
+}
+
+func (i *InternalChannel) Retrieve(channelName string) *iwfidl.EncodedObject {
+	l := i.receivedData[channelName]
+	if len(l) <= 0 {
+		panic("critical bug, this shouldn't happen")
+	}
+	data := l[0]
+	l = l[1:]
+	if len(l) == 0 {
+		delete(i.receivedData, channelName)
+	} else {
+		i.receivedData[channelName] = l
+	}
+
+	return data
+}

service/interpreter/continueAsNewer.go

@@ -16,7 +16,7 @@ type ContinueAsNewer struct {
 	inflightUpdateOperations  int
 
 	stateRequestQueue     *StateRequestQueue
-	interStateChannel     *InterStateChannel
+	interStateChannel     *InternalChannel
 	stateExecutionCounter *StateExecutionCounter
 	persistenceManager    *PersistenceManager
 	signalReceiver        *SignalReceiver
@@ -26,7 +26,7 @@ type ContinueAsNewer struct {
 
 func NewContinueAsNewer(
 	provider WorkflowProvider,
-	interStateChannel *InterStateChannel, signalReceiver *SignalReceiver, stateExecutionCounter *StateExecutionCounter,
+	interStateChannel *InternalChannel, signalReceiver *SignalReceiver, stateExecutionCounter *StateExecutionCounter,
 	persistenceManager *PersistenceManager, stateRequestQueue *StateRequestQueue, collector *OutputCollector,
 	timerProcessor *TimerProcessor,
 ) *ContinueAsNewer {
@@ -120,8 +120,8 @@ func (c *ContinueAsNewer) SetQueryHandlersForContinueAsNew(ctx UnifiedContext) e
 			localStateExecutionToResumeMap[value.StateExecutionId] = value
 		}
 		return &service.ContinueAsNewDumpResponse{
-			InterStateChannelReceived:  c.interStateChannel.ReadReceived(nil),
-			SignalsReceived:            c.signalReceiver.DumpReceived(nil),
+			InterStateChannelReceived:  c.interStateChannel.DumpReceived(),
+			SignalsReceived:            c.signalReceiver.DumpReceived(),
 			StateExecutionCounterInfo:  c.stateExecutionCounter.Dump(),
 			DataObjects:                c.persistenceManager.GetAllDataObjects(),
 			SearchAttributes:           c.persistenceManager.GetAllSearchAttributes(),

service/interpreter/outputCollector.go

@@ -16,7 +16,9 @@ func NewOutputCollector(initOutputs []iwfidl.StateCompletionOutput) *OutputColle
 }
 
 func (o *OutputCollector) Add(output iwfidl.StateCompletionOutput) {
-	o.outputs = append(o.outputs, output)
+	if output.CompletedStateOutput != nil {
+		o.outputs = append(o.outputs, output)
+	}
 }
 
 func (o *OutputCollector) GetAll() []iwfidl.StateCompletionOutput {

service/interpreter/signalReceiver.go

@@ -15,13 +15,13 @@ type SignalReceiver struct {
 	provider                   WorkflowProvider
 	timerProcessor             *TimerProcessor
 	workflowConfiger           *WorkflowConfiger
-	interStateChannel          *InterStateChannel
+	interStateChannel          *InternalChannel
 	stateRequestQueue          *StateRequestQueue
 	persistenceManager         *PersistenceManager
 }
 
 func NewSignalReceiver(
-	ctx UnifiedContext, provider WorkflowProvider, interStateChannel *InterStateChannel,
+	ctx UnifiedContext, provider WorkflowProvider, interStateChannel *InternalChannel,
 	stateRequestQueue *StateRequestQueue,
 	persistenceManager *PersistenceManager, tp *TimerProcessor, continueAsNewCounter *ContinueAsNewCounter,
 	workflowConfiger *WorkflowConfiger,
@@ -224,19 +224,17 @@ func (sr *SignalReceiver) Retrieve(channelName string) *iwfidl.EncodedObject {
 	}
 	sigVal := l[0]
 	l = l[1:]
-	sr.receivedSignals[channelName] = l
+	if len(l) == 0 {
+		delete(sr.receivedSignals, channelName)
+	} else {
+		sr.receivedSignals[channelName] = l
+	}
+
 	return sigVal
 }
 
-func (sr *SignalReceiver) DumpReceived(channelNames []string) map[string][]*iwfidl.EncodedObject {
-	if len(channelNames) == 0 {
-		return sr.receivedSignals
-	}
-	data := make(map[string][]*iwfidl.EncodedObject)
-	for _, n := range channelNames {
-		data[n] = sr.receivedSignals[n]
-	}
-	return data
+func (sr *SignalReceiver) DumpReceived() map[string][]*iwfidl.EncodedObject {
+	return sr.receivedSignals
 }
 
 // DrainAllReceivedButUnprocessedSignals will process all the signals that are received but not processed in the current

service/interpreter/workflowImpl.go

@@ -76,7 +76,7 @@ func InterpreterImpl(
 		IwfWorkerUrl:    input.IwfWorkerUrl,
 	}
 
-	var interStateChannel *InterStateChannel
+	var interStateChannel *InternalChannel
 	var stateRequestQueue *StateRequestQueue
 	var persistenceManager *PersistenceManager
 	var timerProcessor *TimerProcessor
@@ -382,7 +382,7 @@ func InterpreterImpl(
 func checkClosingWorkflow(
 	ctx UnifiedContext, provider WorkflowProvider, versioner *GlobalVersioner, decision *iwfidl.StateDecision,
 	currentStateId, currentStateExeId string,
-	internalChannel *InterStateChannel, signalReceiver *SignalReceiver,
+	internalChannel *InternalChannel, signalReceiver *SignalReceiver,
 ) (canGoNext, gracefulComplete, forceComplete, forceFail bool, completeOutput *iwfidl.StateCompletionOutput, err error) {
 	if decision.HasConditionalClose() {
 		conditionClose := decision.ConditionalClose
@@ -511,7 +511,7 @@ func processStateExecution(
 	stateReq StateRequest,
 	stateExeId string,
 	persistenceManager *PersistenceManager,
-	interStateChannel *InterStateChannel,
+	interStateChannel *InternalChannel,
 	signalReceiver *SignalReceiver,
 	timerProcessor *TimerProcessor,
 	continueAsNewer *ContinueAsNewer,
@@ -818,7 +818,7 @@ func invokeStateExecute(
 	state iwfidl.StateMovement,
 	stateExeId string,
 	persistenceManager *PersistenceManager,
-	interStateChannel *InterStateChannel,
+	interStateChannel *InternalChannel,
 	executionContext iwfidl.Context,
 	commandRes *iwfidl.CommandResults,
 	continueAsNewer *ContinueAsNewer,

service/interpreter/workflowUpdater.go

@@ -11,7 +11,7 @@ type WorkflowUpdater struct {
 	provider             WorkflowProvider
 	continueAsNewer      *ContinueAsNewer
 	continueAsNewCounter *ContinueAsNewCounter
-	interStateChannel    *InterStateChannel
+	interStateChannel    *InternalChannel
 	stateRequestQueue    *StateRequestQueue
 	configer             *WorkflowConfiger
 	logger               UnifiedLogger
@@ -23,7 +23,7 @@ func NewWorkflowUpdater(
 	ctx UnifiedContext, provider WorkflowProvider, persistenceManager *PersistenceManager,
 	stateRequestQueue *StateRequestQueue,
 	continueAsNewer *ContinueAsNewer, continueAsNewCounter *ContinueAsNewCounter, configer *WorkflowConfiger,
-	interStateChannel *InterStateChannel, basicInfo service.BasicInfo, globalVersioner *GlobalVersioner,
+	interStateChannel *InternalChannel, basicInfo service.BasicInfo, globalVersioner *GlobalVersioner,
 ) (*WorkflowUpdater, error) {
 	updater := &WorkflowUpdater{
 		persistenceManager:   persistenceManager,