feat: implement part of user service (#2053)

* feat: implement part of user service

* chore: update

* chore: update

api/v2/v2.go

@@ -1 +1,45 @@
 package v2
+
+import (
+	"context"
+	"fmt"
+
+	grpcRuntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/labstack/echo/v4"
+	apiv2pb "github.com/usememos/memos/proto/gen/api/v2"
+	"github.com/usememos/memos/store"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func NewGRPCServer(store *store.Store) *grpc.Server {
+	grpcServer := grpc.NewServer()
+	apiv2pb.RegisterUserServiceServer(grpcServer, NewUserService(store))
+	apiv2pb.RegisterTagServiceServer(grpcServer, NewTagService(store))
+	return grpcServer
+}
+
+// RegisterGateway registers the gRPC-Gateway with the given Echo instance.
+func RegisterGateway(ctx context.Context, e *echo.Echo, grpcServerPort int) error {
+	// Create a client connection to the gRPC Server we just started.
+	// This is where the gRPC-Gateway proxies the requests.
+	conn, err := grpc.DialContext(
+		ctx,
+		fmt.Sprintf(":%d", grpcServerPort),
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	)
+	if err != nil {
+		return err
+	}
+
+	gwMux := grpcRuntime.NewServeMux()
+	if err := apiv2pb.RegisterUserServiceHandler(context.Background(), gwMux, conn); err != nil {
+		return err
+	}
+	if err := apiv2pb.RegisterTagServiceHandler(context.Background(), gwMux, conn); err != nil {
+		return err
+	}
+	e.Any("/api/v2/*", echo.WrapHandler(gwMux))
+
+	return nil
+}