syntax = "proto2";
package dht.pb;

import "record.proto";

message Message {
	enum MessageType {
		PUT_VALUE = 0;
		GET_VALUE = 1;
		ADD_PROVIDER = 2;
		GET_PROVIDERS = 3;
		FIND_NODE = 4;
		PING = 5;
	}

	enum ConnectionType {
		// sender does not have a connection to peer, and no extra information (default)
		NOT_CONNECTED = 0;

		// sender has a live connection to peer
		CONNECTED = 1;

		// sender recently connected to peer
		CAN_CONNECT = 2;

		// sender recently tried to connect to peer repeatedly but failed to connect
		// ("try" here is loose, but this should signal "made strong effort, failed")
		CANNOT_CONNECT = 3;
	}

	message Peer {
		// ID of a given peer.
		optional bytes id = 1;

		// multiaddrs for a given peer
		repeated bytes addrs = 2;

		// used to signal the sender's connection capabilities to the peer
		optional ConnectionType connection = 3;
	}

	// defines what type of message it is.
	optional MessageType type = 1;

	// defines what coral cluster level this query/response belongs to.
	optional int32 clusterLevelRaw = 10;

	// Used to specify the key associated with this message.
	// PUT_VALUE, GET_VALUE, ADD_PROVIDER, GET_PROVIDERS
	optional bytes key = 2;

	// Used to return a value
	// PUT_VALUE, GET_VALUE
	optional record.pb.Record record = 3;

	// Used to return peers closer to a key in a query
	// GET_VALUE, GET_PROVIDERS, FIND_NODE
	repeated Peer closerPeers = 8;

	// Used to return Providers
	// GET_VALUE, ADD_PROVIDER, GET_PROVIDERS
	repeated Peer providerPeers = 9;
}