// Copyright 2019, The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//! # DHT discovery protocol
//!
//! This protocol broadcasts an encrypted discovery message to the destination peer.
//! The source of this message is unknown to other network peers without using heuristic-based network analysis.
//! This method of discovery requires both peers to be online.
//!
//! The protocol functions as follows:
//! 1. Broadcast an encrypted [Discovery](crate::envelope::DhtMessageType) message destined for the peer containing the
//!    necessary details to connect to this peer.
//! 1. If the peer is online, it may decrypt the message and view the peer connection details.
//! 1. The peer may then add the peer and attempt to connect to it.
//! 1. Once a direct connection is established, the discovery is complete.

mod error;
pub use error::DhtDiscoveryError;

mod requester;
pub use requester::DhtDiscoveryRequester;

pub(crate) use self::requester::DhtDiscoveryRequest;

mod service;
pub use service::DhtDiscoveryService;
