feat: add event service and slug service

go.mod

@@ -19,3 +19,4 @@ require (
 	golang.org/x/text v0.31.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20251029180050-ab9386a59fda // indirect
 )
+replace git.fossy.my.id/bagas/tunnel-please-grpc => ../tunnel-please-grpc

server/server.go

@@ -6,22 +6,84 @@ import (
 	mathrand "math/rand"
 	"net"
 	"strings"
+	"sync"
 	"time"
 
 	"git.fossy.my.id/bagas/tunnel-please-controller/db/sqlc/repository"
-	identifier "git.fossy.my.id/bagas/tunnel-please-grpc/gen"
+	proto "git.fossy.my.id/bagas/tunnel-please-grpc/gen"
 	"github.com/google/uuid"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/health"
+	"google.golang.org/grpc/health/grpc_health_v1"
 	"google.golang.org/grpc/reflection"
 	"google.golang.org/protobuf/types/known/emptypb"
 )
 
 type Server struct {
 	Database   *repository.Queries
-	identifier.UnimplementedIdentityServer
+	Subscriber []chan *proto.Event
+	mu         sync.RWMutex
+	proto.UnimplementedIdentityServer
+	proto.UnimplementedEventServiceServer
+	proto.UnimplementedSlugServer
 }
 
-func (s *Server) Get(ctx context.Context, request *identifier.IdentifierRequest) (*identifier.IdentifierResponse, error) {
+func (s *Server) ChangeSlug(ctx context.Context, request *proto.ChangeSlugRequest) (*proto.ChangeSlugResponse, error) {
+	s.NotifyAllSubscriber(&proto.Event{
+		Type:            proto.EventType_SLUG_CHANGE,
+		TimestampUnixMs: time.Now().Unix(),
+		Data: &proto.Event_DataEvent{DataEvent: &proto.SlugChangeEvent{
+			Old: request.GetOld(),
+			New: request.GetNew(),
+		}},
+	})
+	return &proto.ChangeSlugResponse{}, nil
+}
+
+func (s *Server) Subscribe(request *emptypb.Empty, g grpc.ServerStreamingServer[proto.Event]) error {
+	sr := make(chan *proto.Event)
+	s.AddSubscriberChan(sr)
+	defer s.RemoveSubscriberChan(sr)
+
+	for ev := range sr {
+		if err := g.Send(ev); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *Server) NotifyAllSubscriber(event *proto.Event) {
+	for _, subs := range s.Subscriber {
+		subs <- event
+	}
+}
+
+func (s *Server) AddSubscriberChan(event chan *proto.Event) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.Subscriber = append(s.Subscriber, event)
+}
+
+func (s *Server) RemoveSubscriberChan(ch chan *proto.Event) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if len(s.Subscriber) == 0 || ch == nil {
+		return
+	}
+	newSubs := s.Subscriber[:0]
+	for _, c := range s.Subscriber {
+		if c == ch {
+			continue
+		}
+		newSubs = append(newSubs, c)
+	}
+	s.Subscriber = newSubs
+
+	close(ch)
+}
+
+func (s *Server) Get(ctx context.Context, request *proto.IdentifierRequest) (*proto.IdentifierResponse, error) {
 	parse, err := uuid.Parse(request.GetId())
 	if err != nil {
 		return nil, err
@@ -30,18 +92,18 @@ func (s *Server) Get(ctx context.Context, request *identifier.IdentifierRequest)
 	if err != nil {
 		return nil, err
 	}
-	return &identifier.IdentifierResponse{
+	return &proto.IdentifierResponse{
 		Id:   data.ID.String(),
 		Slug: data.Slug,
 	}, nil
 }
 
-func (s *Server) Create(ctx context.Context, request *emptypb.Empty) (*identifier.IdentifierResponse, error) {
+func (s *Server) Create(ctx context.Context, request *emptypb.Empty) (*proto.IdentifierResponse, error) {
 	createIdentifier, err := s.Database.CreateIdentifier(ctx, GenerateRandomString(32))
 	if err != nil {
 		return nil, err
 	}
-	return &identifier.IdentifierResponse{
+	return &proto.IdentifierResponse{
 		Id:   createIdentifier.ID.String(),
 		Slug: createIdentifier.Slug,
 	}, nil
@@ -59,7 +121,7 @@ func GenerateRandomString(length int) string {
 }
 
 func New(database *repository.Queries) *Server {
-	return &Server{Database: database}
+	return &Server{Database: database, Subscriber: make([]chan *proto.Event, 0)}
 }
 
 func (s *Server) ListenAndServe(Addr string) error {
@@ -71,7 +133,14 @@ func (s *Server) ListenAndServe(Addr string) error {
 	grpcServer := grpc.NewServer()
 	reflection.Register(grpcServer)
 
-	identifier.RegisterIdentityServer(grpcServer, s)
+	proto.RegisterIdentityServer(grpcServer, s)
+	proto.RegisterEventServiceServer(grpcServer, s)
+	proto.RegisterSlugServer(grpcServer, s)
+
+	healthServer := health.NewServer()
+	grpc_health_v1.RegisterHealthServer(grpcServer, healthServer)
+	healthServer.SetServingStatus("", grpc_health_v1.HealthCheckResponse_SERVING)
+
 	if err := grpcServer.Serve(listener); err != nil {
 		log.Fatalf("failed to serve: %v", err)
 	}