syntax = "proto3";

package lightrpc;

message EmptyRequest {}

enum GossipType {
    // Lightclient gossip
    LightClientFinalityUpdateGossipType = 0;
    LightClientOptimisticUpdateGossipType = 1;
    // Legacy gossip
    BeaconBlockGossipType = 2;
}

message GossipData {
    bytes data = 1; // SSZ encoded data
    GossipType type = 2;
}

message PeerCount {
    uint64 amount = 1;
}

message RequestData {
    bytes data = 1; // SSZ encoded data
    string topic = 2;
}

message ResponseData {
    bytes data = 1; // prefix-stripped SSZ encoded data
    bool error = 2; // did the peer encounter an error
}

service Sentinel {
    rpc SubscribeGossip(EmptyRequest) returns (stream GossipData);
    rpc SendRequest(RequestData) returns (ResponseData);
    rpc GetPeers(EmptyRequest) returns (PeerCount);
}