fix #792 (#873)

zrpc/internal/codes/accept.go

@@ -1,6 +1,8 @@
 package codes
 
 import (
+	"context"
+
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
@@ -10,6 +12,17 @@ func Acceptable(err error) bool {
 	switch status.Code(err) {
 	case codes.DeadlineExceeded, codes.Internal, codes.Unavailable, codes.DataLoss:
 		return false
+	case codes.Unknown:
+		return acceptableUnknown(err)
+	default:
+		return true
+	}
+}
+
+func acceptableUnknown(err error) bool {
+	switch err {
+	case context.DeadlineExceeded:
+		return false
 	default:
 		return true
 	}