// Copyright 2018 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// -----------------------------------------------------------------------------
syntax = "proto3";


// An Entry in the change log for a given state root.
message ChangeLogEntry {
    // A state root that succeed this root.
    message Successor {
        // A root hash of a merkle trie based of off this root.
        bytes successor = 1;

        // The keys (i.e. hashes) that were replaced (i.e. deleted) by this
        // successor.  These may be deleted during pruning.
        repeated bytes deletions = 2;
    }

    // A root hash of a merkle trie this tree was based off.
    bytes parent = 1;

    // The hashes that were added for this root. These may be deleted during
    // pruning, if this root is being abandoned.
    repeated bytes additions = 2;

    // The list of successors.
    repeated Successor successors = 3;
}