unified gateway interface

api/billing/fees/internal/service/fees/service.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/tech/sendico/billing/fees/internal/appversion"
 	internalcalculator "github.com/tech/sendico/billing/fees/internal/service/fees/internal/calculator"
 	"github.com/tech/sendico/billing/fees/internal/service/fees/internal/resolver"
 	"github.com/tech/sendico/billing/fees/storage"
@@ -15,9 +16,11 @@ import (
 	oracleclient "github.com/tech/sendico/fx/oracle/client"
 	"github.com/tech/sendico/pkg/api/routers"
 	clockpkg "github.com/tech/sendico/pkg/clock"
+	"github.com/tech/sendico/pkg/discovery"
 	"github.com/tech/sendico/pkg/merrors"
 	msg "github.com/tech/sendico/pkg/messaging"
 	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/mservice"
 	feesv1 "github.com/tech/sendico/pkg/proto/billing/fees/v1"
 	tracev1 "github.com/tech/sendico/pkg/proto/common/trace/v1"
 	"go.mongodb.org/mongo-driver/bson/primitive"
@@ -36,6 +39,7 @@ type Service struct {
 	calculator Calculator
 	oracle     oracleclient.Client
 	resolver   FeeResolver
+	announcer  *discovery.Announcer
 	feesv1.UnimplementedFeeEngineServer
 }
 
@@ -62,6 +66,8 @@ func NewService(logger mlogger.Logger, repo storage.Repository, producer msg.Pro
 		svc.resolver = resolver.New(repo.Plans(), svc.logger)
 	}
 
+	svc.startDiscoveryAnnouncer()
+
 	return svc
 }
 
@@ -71,6 +77,28 @@ func (s *Service) Register(router routers.GRPC) error {
 	})
 }
 
+func (s *Service) Shutdown() {
+	if s == nil {
+		return
+	}
+	if s.announcer != nil {
+		s.announcer.Stop()
+	}
+}
+
+func (s *Service) startDiscoveryAnnouncer() {
+	if s == nil || s.producer == nil {
+		return
+	}
+	announce := discovery.Announcement{
+		Service:    "BILLING_FEES",
+		Operations: []string{"fee.calc"},
+		Version:    appversion.Create().Short(),
+	}
+	s.announcer = discovery.NewAnnouncer(s.logger, s.producer, string(mservice.FeePlans), announce)
+	s.announcer.Start()
+}
+
 func (s *Service) QuoteFees(ctx context.Context, req *feesv1.QuoteFeesRequest) (resp *feesv1.QuoteFeesResponse, err error) {
 	var (
 		meta   *feesv1.RequestMeta