Confirmation + Controlling API add

infrastructure/api.go

@@ -52,6 +52,10 @@ func GetWorkflowPeerIDs(wfID string, req *tools.APIRequest) ([]string, error) {
 // Planner subscriptions
 // ---------------------------------------------------------------------------
 
+func SubscribeSessionConfirmation(executionsID string) (<-chan struct{}, func()) {
+	return execution.SubscribeSessionConfirmation(executionsID)
+}
+
 func SubscribePlannerUpdates(peerIDs []string) (<-chan string, func()) {
 	return planner.GetPlannerService().SubscribePlannerUpdates(peerIDs...)
 }

infrastructure/execution/execution.go

@@ -24,6 +24,46 @@ import (
 	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
+// ---------------------------------------------------------------------------
+// Session confirmation pub/sub
+// ---------------------------------------------------------------------------
+
+var sessionConfirmMu sync.Mutex
+var sessionConfirmSubs = map[string][]chan struct{}{}
+
+// SubscribeSessionConfirmation returns a channel that receives one signal when
+// the first execution of the given session is fully confirmed (IsDraft=false).
+// The returned cancel func must be called to clean up.
+func SubscribeSessionConfirmation(executionsID string) (<-chan struct{}, func()) {
+	ch := make(chan struct{}, 1)
+	sessionConfirmMu.Lock()
+	sessionConfirmSubs[executionsID] = append(sessionConfirmSubs[executionsID], ch)
+	sessionConfirmMu.Unlock()
+	return ch, func() {
+		sessionConfirmMu.Lock()
+		subs := sessionConfirmSubs[executionsID]
+		for i, c := range subs {
+			if c == ch {
+				sessionConfirmSubs[executionsID] = append(subs[:i], subs[i+1:]...)
+				break
+			}
+		}
+		sessionConfirmMu.Unlock()
+	}
+}
+
+func notifySessionConfirmed(executionsID string) {
+	sessionConfirmMu.Lock()
+	subs := sessionConfirmSubs[executionsID]
+	sessionConfirmMu.Unlock()
+	for _, ch := range subs {
+		select {
+		case ch <- struct{}{}:
+		default:
+		}
+	}
+}
+
 // ---------------------------------------------------------------------------
 // Global execution lock registry
 // ---------------------------------------------------------------------------
@@ -135,6 +175,7 @@ func UpdateExecutionState(payload []byte, dt tools.DataType) {
 		return
 	}
 	if allConfirmed {
+		go notifySessionConfirmed(exec.ExecutionsID)
 		go confirmSessionOrder(exec.ExecutionsID, adminReq)
 		obj, _, err := workflow.NewAccessor(adminReq).LoadOne(exec.WorkflowID)
 		if err == nil && obj != nil {