feat: add durable Kuknos settlement coordination

interface/grpc/health.go

@@ -5,18 +5,27 @@ import (
 
 	"gl/application/health"
 	applicationledger "gl/application/ledger"
+	applicationsettlement "gl/application/settlement"
 	basev1 "gl/gen/base/v1"
 	ledgerv1 "gl/gen/ledger/v1"
 )
 
 type Handler struct {
 	ledgerv1.UnimplementedGeneralLedgerServiceServer
-	health *health.Service
-	ledger *applicationledger.Service
+	health     *health.Service
+	ledger     *applicationledger.Service
+	settlement *applicationsettlement.Service
+	adminToken string
 }
 
-func NewHandler(healthService *health.Service, ledgerService *applicationledger.Service) *Handler {
-	return &Handler{health: healthService, ledger: ledgerService}
+func (h *Handler) WithSettlementAdminToken(token string) *Handler { h.adminToken = token; return h }
+
+func NewHandler(healthService *health.Service, ledgerService *applicationledger.Service, settlementService ...*applicationsettlement.Service) *Handler {
+	var settlement *applicationsettlement.Service
+	if len(settlementService) > 0 {
+		settlement = settlementService[0]
+	}
+	return &Handler{health: healthService, ledger: ledgerService, settlement: settlement}
 }
 
 func NewHealthHandler(service *health.Service) *Handler {
@@ -26,7 +35,13 @@ func NewHealthHandler(service *health.Service) *Handler {
 func (h *Handler) Health(ctx context.Context, _ *basev1.Empty) (*ledgerv1.HealthResponse, error) {
 	result := h.health.Check(ctx)
 	return &ledgerv1.HealthResponse{
-		Serving:       result.Serving,
-		DatabaseReady: result.DatabaseReady,
+		Serving:                result.Serving,
+		DatabaseReady:          result.DatabaseReady,
+		SettlementEnabled:      result.SettlementEnabled,
+		SettlementReady:        result.SettlementReady,
+		SettlementPending:      result.SettlementStats.Pending,
+		SettlementRetryable:    result.SettlementStats.Retryable,
+		SettlementManualReview: result.SettlementStats.ManualReview,
+		OldestPendingSeconds:   result.SettlementStats.OldestPendingSeconds,
 	}, nil
 }