layer1: add namespace manager model step 7

pkg/utils/namespace_manager_model.go

@@ -0,0 +1,95 @@
+package utils
+
+import "time"
+
+type NamespacePhase string
+
+const (
+	NamespacePhaseDiscovered    NamespacePhase = "discovered"
+	NamespacePhaseRegistering   NamespacePhase = "registering"
+	NamespacePhaseActive        NamespacePhase = "active"
+	NamespacePhaseDeregistering NamespacePhase = "deregistering"
+	NamespacePhaseRemoved       NamespacePhase = "removed"
+	NamespacePhaseFailed        NamespacePhase = "failed"
+)
+
+type NamespaceSource string
+
+const (
+	NamespaceSourceEnv      NamespaceSource = "env"
+	NamespaceSourceWatcher  NamespaceSource = "watcher"
+	NamespaceSourceBackfill NamespaceSource = "backfill"
+)
+
+type NamespaceEventType string
+
+const (
+	NamespaceEventAdd    NamespaceEventType = "add"
+	NamespaceEventUpdate NamespaceEventType = "update"
+	NamespaceEventRemove NamespaceEventType = "remove"
+	NamespaceEventResync NamespaceEventType = "resync"
+)
+
+type NamespacePartState struct {
+	State     string
+	LastError string
+	UpdatedAt time.Time
+}
+
+type NamespaceRecord struct {
+	Name            string
+	Source          NamespaceSource
+	Labels          map[string]string
+	Phase           NamespacePhase
+	LastError       string
+	Generation      int64
+	UpdatedAt       time.Time
+	RegisteredParts map[string]NamespacePartState
+}
+
+type NamespaceEvent struct {
+	Type       NamespaceEventType
+	Name       string
+	Labels     map[string]string
+	Source     NamespaceSource
+	ObservedAt time.Time
+}
+
+func (nr NamespaceRecord) Clone() NamespaceRecord {
+	clone := nr
+	clone.Labels = cloneStringMap(nr.Labels)
+	clone.RegisteredParts = cloneNamespacePartStates(nr.RegisteredParts)
+	return clone
+}
+
+func (nr NamespaceRecord) IsActive() bool {
+	return nr.Phase == NamespacePhaseActive
+}
+
+func (nr NamespaceRecord) IsTerminal() bool {
+	return nr.Phase == NamespacePhaseRemoved || nr.Phase == NamespacePhaseFailed
+}
+
+func cloneStringMap(input map[string]string) map[string]string {
+	if input == nil {
+		return nil
+	}
+
+	clone := make(map[string]string, len(input))
+	for key, value := range input {
+		clone[key] = value
+	}
+	return clone
+}
+
+func cloneNamespacePartStates(input map[string]NamespacePartState) map[string]NamespacePartState {
+	if input == nil {
+		return nil
+	}
+
+	clone := make(map[string]NamespacePartState, len(input))
+	for key, value := range input {
+		clone[key] = value
+	}
+	return clone
+}