fix:#56 added update for grpc

services/data-manager/service/grpc/server.go

@@ -2,8 +2,10 @@ package grpc
 
 import (
 	"github.com/pocketbase/pocketbase"
+	"google.golang.org/grpc/keepalive"
 	"log"
 	"net"
+	"time"
 
 	"google.golang.org/grpc"
 	pb "htwkalender/common/genproto/modules"
@@ -14,7 +16,20 @@ func StartGRPCServer(app *pocketbase.PocketBase) {
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)
 	}
-	s := grpc.NewServer()
+	s := grpc.NewServer(
+		grpc.KeepaliveParams(keepalive.ServerParameters{
+			MaxConnectionIdle:     5 * time.Minute,  // Idle timeout before closing connection
+			MaxConnectionAge:      30 * time.Minute, // Max time before connection is closed
+			MaxConnectionAgeGrace: 5 * time.Minute,  // Allow grace period before closing
+			Time:                  2 * time.Minute,  // Ping the client every 2 minutes
+			Timeout:               20 * time.Second, // Wait 20 seconds for ping ack
+		}),
+		grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
+			MinTime:             1 * time.Minute, // Minimum time between pings from clients
+			PermitWithoutStream: true,            // Don't allow pings when there are no active RPCs
+		}),
+		grpc.MaxConcurrentStreams(0),
+	)
 
 	pb.RegisterModuleServiceServer(s, &ModuleServiceHandler{
 		app: app,

services/ical/main.go

@@ -39,8 +39,15 @@ func main() {
 	}
 
 	grpcClient := grpc.ConnectGRPCServer(host)
+
+	// Close the grpc connection when the main function ends
 	defer grpc.CloseGRPCServer(grpcClient)
 
+	// Log the grpc connection
+	// Test the connection to the grpc server
+	grpcClient.Connect()
+	slog.Info("GRPC connection state", "state", grpcClient.GetState())
+
 	// Initialize a new Fiber app
 	webdavRequestMethods := []string{"PROPFIND", "MKCOL", "COPY", "MOVE"}
 

services/ical/service/connector/grpc/client.go

@@ -19,14 +19,31 @@ package grpc
 import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/keepalive"
 	"log/slog"
+	"sync"
+	"time"
 )
 
+var conn *grpc.ClientConn
+var once sync.Once
+
 func ConnectGRPCServer(host string) *grpc.ClientConn {
-	conn, err := grpc.NewClient(host+":50051", grpc.WithTransportCredentials(insecure.NewCredentials()))
-	if err != nil {
-		slog.Error("could not connect to grpc server", "error", err)
-	}
+	once.Do(func() {
+		var err error
+		conn, err = grpc.NewClient(
+			host+":50051",
+			grpc.WithTransportCredentials(insecure.NewCredentials()),
+			grpc.WithKeepaliveParams(keepalive.ClientParameters{
+				Time:                2 * time.Minute,
+				Timeout:             20 * time.Second,
+				PermitWithoutStream: true,
+			}),
+		)
+		if err != nil {
+			slog.Error("could not connect to grpc server", "error", err)
+		}
+	})
 	return conn
 }