add:

app/users/rpc/internal/logic/getUserByUsernameLogic.go

@@ -5,6 +5,7 @@ import (
 
 	"juwan-backend/app/users/rpc/internal/svc"
 	"juwan-backend/app/users/rpc/pb"
+	"juwan-backend/common/converter"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -23,8 +24,19 @@ func NewGetUserByUsernameLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 	}
 }
 
-func (l *GetUserByUsernameLogic) GetUserByUsername(in *pb.GetUsersByIdReq) (*pb.GetUsersByIdResp, error) {
+func (l *GetUserByUsernameLogic) GetUserByUsername(in *pb.GetUserByUsernameReq) (*pb.GetUserByUsernameResp, error) {
 	// todo: add your logic here and delete this line
 
-	return &pb.GetUsersByIdResp{}, nil
+	user, err := l.svcCtx.UsersModel.FindOneByUsername(l.ctx, in.Username)
+	pbUsers := &pb.Users{}
+	converter.StructToStruct(user, pbUsers)
+	if err == nil || user != nil {
+		return &pb.GetUserByUsernameResp{
+			Users: pbUsers,
+		}, nil
+	}
+	if err.Error() != "not found" {
+		return nil, err
+	}
+	return &pb.GetUserByUsernameResp{}, nil
 }