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|
package main
import (
"context"
"fmt"
"log"
"net"
"sync"
"time"
pb "example.com/user"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/emptypb"
"google.golang.org/protobuf/types/known/timestamppb"
)
// Veritabanı mock'u
var (
mockUsers = []*pb.UserResponse{
{
Id: 1,
Name: "Ahmet Yılmaz",
Email: "ahmet@example.com",
Role: "admin",
CreatedAt: timestamppb.New(time.Now()),
UpdatedAt: timestamppb.New(time.Now()),
},
{
Id: 2,
Name: "Ayşe Demir",
Email: "ayse@example.com",
Role: "user",
CreatedAt: timestamppb.New(time.Now()),
UpdatedAt: timestamppb.New(time.Now()),
},
{
Id: 3,
Name: "Mehmet Kaya",
Email: "mehmet@example.com",
Role: "user",
CreatedAt: timestamppb.New(time.Now()),
UpdatedAt: timestamppb.New(time.Now()),
},
}
userMutex sync.RWMutex
nextID int32 = 4
)
type server struct {
pb.UnimplementedUserServiceServer
}
// GetUser - Unary RPC implementasyonu
func (s *server) GetUser(ctx context.Context, req *pb.UserRequest) (*pb.UserResponse, error) {
log.Printf("GetUser çağrıldı: ID=%d", req.Id)
// Context kontrolü - timeout/cancel durumlarını handle et
if ctx.Err() == context.DeadlineExceeded {
return nil, status.Error(codes.DeadlineExceeded, "İstek zaman aşımına uğradı")
}
if ctx.Err() == context.Canceled {
return nil, status.Error(codes.Canceled, "İstek iptal edildi")
}
userMutex.RLock()
defer userMutex.RUnlock()
// Kullanıcı bul
for _, user := range mockUsers {
if user.Id == req.Id {
return user, nil
}
}
// Kullanıcı bulunamazsa hata döndür
return nil, status.Errorf(codes.NotFound, "Kullanıcı ID=%d bulunamadı", req.Id)
}
// CreateUser - Kullanıcı oluşturma
func (s *server) CreateUser(ctx context.Context, req *pb.CreateUserRequest) (*pb.UserResponse, error) {
log.Printf("CreateUser çağrıldı: email=%s", req.Email)
// Validasyon
if req.Name == "" || req.Email == "" {
return nil, status.Error(codes.InvalidArgument, "İsim ve email zorunludur")
}
userMutex.Lock()
defer userMutex.Unlock()
// Email kontrolü
for _, user := range mockUsers {
if user.Email == req.Email {
return nil, status.Errorf(codes.AlreadyExists, "Email %s zaten kullanılıyor", req.Email)
}
}
now := time.Now()
newUser := &pb.UserResponse{
Id: nextID,
Name: req.Name,
Email: req.Email,
Role: req.Role,
CreatedAt: timestamppb.New(now),
UpdatedAt: timestamppb.New(now),
}
if newUser.Role == "" {
newUser.Role = "user"
}
mockUsers = append(mockUsers, newUser)
nextID++
return newUser, nil
}
// UpdateUser - Kullanıcı güncelleme
func (s *server) UpdateUser(ctx context.Context, req *pb.UpdateUserRequest) (*pb.UserResponse, error) {
log.Printf("UpdateUser çağrıldı: ID=%d", req.Id)
userMutex.Lock()
defer userMutex.Unlock()
for i, user := range mockUsers {
if user.Id == req.Id {
if req.Name != "" {
mockUsers[i].Name = req.Name
}
if req.Email != "" {
mockUsers[i].Email = req.Email
}
if req.Role != "" {
mockUsers[i].Role = req.Role
}
mockUsers[i].UpdatedAt = timestamppb.New(time.Now())
return mockUsers[i], nil
}
}
return nil, status.Errorf(codes.NotFound, "Kullanıcı ID=%d bulunamadı", req.Id)
}
// DeleteUser - Kullanıcı silme
func (s *server) DeleteUser(ctx context.Context, req *pb.UserRequest) (*emptypb.Empty, error) {
log.Printf("DeleteUser çağrıldı: ID=%d", req.Id)
userMutex.Lock()
defer userMutex.Unlock()
for i, user := range mockUsers {
if user.Id == req.Id {
mockUsers = append(mockUsers[:i], mockUsers[i+1:]...)
return &emptypb.Empty{}, nil
}
}
return nil, status.Errorf(codes.NotFound, "Kullanıcı ID=%d bulunamadı", req.Id)
}
// StreamUsers - Server Streaming RPC implementasyonu
func (s *server) StreamUsers(filter *pb.UserFilter, stream pb.UserService_StreamUsersServer) error {
log.Printf("StreamUsers çağrıldı: filter=%v", filter)
userMutex.RLock()
users := make([]*pb.UserResponse, len(mockUsers))
copy(users, mockUsers)
userMutex.RUnlock()
for i, user := range users {
// Filtreleme
if filter.Keyword != "" && !contains(user.Name, filter.Keyword) {
continue
}
// Role filtresi
if len(filter.Roles) > 0 {
found := false
for _, role := range filter.Roles {
if user.Role == role {
found = true
break
}
}
if !found {
continue
}
}
// Limit kontrolü
if filter.Limit > 0 && i >= int(filter.Limit) {
break
}
// Kullanıcıyı stream'e gönder
if err := stream.Send(user); err != nil {
return err
}
// Yapay gecikme - gerçek dünyada veritabanı/network işlemleri
time.Sleep(100 * time.Millisecond)
}
return nil
}
// CreateUsers - Client Streaming RPC implementasyonu
func (s *server) CreateUsers(stream pb.UserService_CreateUsersServer) error {
log.Println("CreateUsers çağrıldı - client streaming")
var createdCount int32
var userIDs []int32
var errors []string
for {
req, err := stream.Recv()
if err != nil {
if err.Error() == "EOF" {
break
}
return err
}
// Kullanıcı oluştur
user, err := s.CreateUser(stream.Context(), req)
if err != nil {
errors = append(errors, fmt.Sprintf("Email %s: %v", req.Email, err))
continue
}
createdCount++
userIDs = append(userIDs, user.Id)
}
// Sonuçları gönder
return stream.SendAndClose(&pb.BulkCreateResponse{
CreatedCount: createdCount,
UserIds: userIDs,
Errors: errors,
})
}
// Chat - Bidirectional Streaming RPC implementasyonu
func (s *server) Chat(stream pb.UserService_ChatServer) error {
log.Println("Chat çağrıldı - bidirectional streaming")
var wg sync.WaitGroup
wg.Add(2)
// Mesaj alma goroutine
go func() {
defer wg.Done()
for {
msg, err := stream.Recv()
if err != nil {
return
}
log.Printf("Mesaj alındı: %s -> %s: %s", msg.From, msg.To, msg.Message)
// Echo gönder
response := &pb.ChatMessage{
From: "Server",
To: msg.From,
Message: fmt.Sprintf("Echo: %s", msg.Message),
Timestamp: timestamppb.New(time.Now()),
Type: pb.MessageType_MESSAGE_TYPE_TEXT,
}
if err := stream.Send(response); err != nil {
return
}
}
}()
// Heartbeat gönderme goroutine
go func() {
defer wg.Done()
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
heartbeat := &pb.ChatMessage{
From: "Server",
Message: "Heartbeat",
Timestamp: timestamppb.New(time.Now()),
Type: pb.MessageType_MESSAGE_TYPE_TEXT,
}
if err := stream.Send(heartbeat); err != nil {
return
}
case <-stream.Context().Done():
return
}
}
}()
wg.Wait()
return nil
}
// contains - basit string arama
func contains(s, substr string) bool {
return len(s) >= len(substr) && (s[:len(substr)] == substr ||
len(s) > len(substr) && s[len(substr):] == substr)
}
func main() {
// TCP listener oluştur
lis, err := net.Listen("tcp", ":50051")
if err != nil {
log.Fatalf("50051 portu dinlenemedi: %v", err)
}
// gRPC sunucusu oluştur
grpcServer := grpc.NewServer(
grpc.MaxConcurrentStreams(1000), // Eşzamanlı stream limiti
grpc.MaxRecvMsgSize(4*1024*1024), // 4MB max mesaj boyutu
grpc.MaxSendMsgSize(4*1024*1024),
)
// Servisi kaydet
pb.RegisterUserServiceServer(grpcServer, &server{})
// Reflection - debug için
reflection.Register(grpcServer)
log.Println("🚀 gRPC Sunucusu 50051 portunda başlatıldı...")
log.Println("📍 Health Check: grpc_health_probe -addr=localhost:50051")
log.Println("📍 API Keşfi: grpcurl -plaintext localhost:50051 list")
// Sunucuyu başlat
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("gRPC sunucusu başlatılamadı: %v", err)
}
}
|
