Log decodeMutation errors

Author: tulir

appstate/decode.go

@@ -204,12 +204,22 @@ func (proc *Processor) decodeMutations(
 	for i, mutation := range mutations {
 		indexMAC, valueMAC, index, syncAction, _, err := proc.decodeMutation(ctx, mutation, i, validateMACs)
 		if err != nil {
+			if !validateMACs {
+				zerolog.Ctx(ctx).Debug().
+					Str("patch_name", string(name)).
+					Uint64("patch_version", patchVersion).
+					Int("mutation_index", i).
+					Hex("key_id", mutation.GetRecord().GetKeyID().GetID()).
+					Err(err).
+					Msg("DEBUG: mutation failed to decode")
+			}
 			return err
 		}
 		if !validateMACs {
 			zerolog.Ctx(ctx).Debug().
 				Str("patch_name", string(name)).
 				Uint64("patch_version", patchVersion).
+				Int("mutation_index", i).
 				Hex("key_id", mutation.GetRecord().GetKeyID().GetID()).
 				Hex("index_mac", indexMAC).
 				Hex("value_mac", valueMAC).