syntax = "proto3";

import "acs7.proto";

option csharp_namespace = "AElf.CrossChain";

message CrossChainRequest {
    int32 chain_id = 1; // own chain id
    int64 next_height = 2;
}

message CrossChainExtraData {
    aelf.Hash transaction_status_merkle_tree_root = 1; // Merkle tree root of side chain block transaction roots
}

message HandShake {
    int32 listening_port = 1;
    int32 chain_id = 2;
}

message HandShakeReply {
    HandShakeStatus status = 1;
    enum HandShakeStatus{
        SUCCESS = 0;
        INVALID_HANDSHAKE_REQUEST = 1;
        FATAL = 2;
    }
}

message SideChainInitializationRequest{
    int32 chain_id = 1;
}

service ParentChainRpc {
    rpc RequestIndexingFromParentChain (CrossChainRequest) returns (stream acs7.ParentChainBlockData) {}
    rpc RequestChainInitializationDataFromParentChain (SideChainInitializationRequest) returns (acs7.ChainInitializationData) {}
}

service SideChainRpc{
    rpc RequestIndexingFromSideChain (CrossChainRequest) returns (stream acs7.SideChainBlockData) {}
}

service BasicCrossChainRpc{
    rpc CrossChainHandShake (HandShake) returns (HandShakeReply) {}
}