// // Copyright 20l9 Parity Technologies (UK) Ltd.
// //
// // Permission is hereby granted, free of charge, to any person obtaining a
// // copy of this software and associated documentation files (the "Software"),
// // to deal in the Software without restriction, including without limitation
// // the rights to use, copy, modify, merge, publish, distribute, sublicense,
// // and/or sell copies of the Software, and to permit persons to whom the
// // Software is furnished to do so, subject to the following conditions:
// //
// // The above copyright notice and this permission notice shall be included in
// // all copies or substantial portions of the Software.
// //
// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// // DEALINGS IN THE SOFTWARE.
//
// //! A basic key value store demonstrating libp2p and the mDNS and Kademlia protocols.
// //!
// //! 1. Using two terminal windows, start two instances. If you local network
// //!    allows mDNS, they will automatically connect.
// //!
// //! 2. Type `PUT my-key my-value` in terminal one and hit return.
// //!
// //! 3. Type `GET my-key` in terminal two and hit return.
// //!
// //! 4. Close with Ctrl-c.
//
// use async_std::{io, task};
// use futures::prelude::*;
// use libp2p::identity::Keypair;
// use libp2p::kad::record::store::MemoryStore;
// use libp2p::kad::{record::Key, Kademlia, KademliaEvent, PutRecordOk, Quorum, Record};
// use libp2p::{
//     build_development_transport, identity,
//     mdns::{Mdns, MdnsEvent},
//     swarm::NetworkBehaviourEventProcess,
//     NetworkBehaviour, PeerId, Swarm,
// };
// use std::{
//     error::Error,
//     task::{Context, Poll},
// };
//
// fn main() -> Result<(), Box<dyn Error>> {
//     env_logger::init();
//
//     // Create a random key for ourselves.
//     let local_key = identity::Keypair::generate_ed25519();
//     let local_peer_id = PeerId::from(local_key.public());
//
//     // Set up a an encrypted DNS-enabled TCP Transport over the Mplex protocol.
//     let transport = build_development_transport(local_key.clone())?;
//
//     // We create a custom network behaviour that combines Kademlia and mDNS.
//     #[derive(NetworkBehaviour)]
//     struct MyBehaviour {
//         kademlia: Kademlia<MemoryStore>,
//         mdns: Mdns,
//     }
//
//     impl NetworkBehaviourEventProcess<MdnsEvent> for MyBehaviour {
//         // Called when `mdns` produces an event.
//         fn inject_event(&mut self, event: MdnsEvent) {
//             if let MdnsEvent::Discovered(list) = event {
//                 for (peer_id, multiaddr) in list {
//                     self.kademlia.add_address(&peer_id, multiaddr);
//                 }
//             }
//         }
//     }
//
//     impl NetworkBehaviourEventProcess<KademliaEvent> for MyBehaviour {
//         // Called when `kademlia` produces an event.
//         fn inject_event(&mut self, message: KademliaEvent) {
//             match message {
//                 KademliaEvent::GetRecordResult(Ok(result)) => {
//                     for Record { key, value, .. } in result.records {
//                         println!(
//                             "Got record {:?} {:?}",
//                             std::str::from_utf8(key.as_ref()).unwrap(),
//                             std::str::from_utf8(&value).unwrap(),
//                         );
//                     }
//                 }
//                 KademliaEvent::GetRecordResult(Err(err)) => {
//                     eprintln!("Failed to get record: {:?}", err);
//                 }
//                 KademliaEvent::PutRecordResult(Ok(PutRecordOk { key })) => {
//                     println!(
//                         "Successfully put record {:?}",
//                         std::str::from_utf8(key.as_ref()).unwrap()
//                     );
//                 }
//                 KademliaEvent::PutRecordResult(Err(err)) => {
//                     eprintln!("Failed to put record: {:?}", err);
//                 }
//                 _ => {}
//             }
//         }
//     }
//
//     // Create a swarm to manage peers and events.
//     let mut swarm = {
//         // Create a Kademlia behaviour.
//         let store = MemoryStore::new(local_peer_id.clone());
//         let Keypair::Ed25519(local_key) = local_key;
//         let kademlia = Kademlia::new(local_key, local_peer_id.clone(), store);
//         let mdns = Mdns::new()?;
//         let behaviour = MyBehaviour { kademlia, mdns };
//         Swarm::new(transport, behaviour, local_peer_id)
//     };
//
//     // Read full lines from stdin
//     let mut stdin = io::BufReader::new(io::stdin()).lines();
//
//     // Listen on all interfaces and whatever port the OS assigns.
//     Swarm::listen_on(&mut swarm, "/ip4/0.0.0.0/tcp/0".parse()?)?;
//
//     // Kick it off.
//     let mut listening = false;
//     task::block_on(future::poll_fn(move |cx: &mut Context| {
//         loop {
//             match stdin.try_poll_next_unpin(cx)? {
//                 Poll::Ready(Some(line)) => handle_input_line(&mut swarm.kademlia, line),
//                 Poll::Ready(None) => panic!("Stdin closed"),
//                 Poll::Pending => break,
//             }
//         }
//         loop {
//             match swarm.poll_next_unpin(cx) {
//                 Poll::Ready(Some(event)) => println!("{:?}", event),
//                 Poll::Ready(None) => return Poll::Ready(Ok(())),
//                 Poll::Pending => {
//                     if !listening {
//                         if let Some(a) = Swarm::listeners(&swarm).next() {
//                             println!("Listening on {:?}", a);
//                             listening = true;
//                         }
//                     }
//                     break;
//                 }
//             }
//         }
//         Poll::Pending
//     }))
// }
//
// fn handle_input_line(kademlia: &mut Kademlia<MemoryStore>, line: String) {
//     let mut args = line.split(" ");
//
//     match args.next() {
//         Some("GET") => {
//             let key = {
//                 match args.next() {
//                     Some(key) => Key::new(&key),
//                     None => {
//                         eprintln!("Expected key");
//                         return;
//                     }
//                 }
//             };
//             kademlia.get_record(&key, Quorum::One);
//         }
//         Some("PUT") => {
//             let key = {
//                 match args.next() {
//                     Some(key) => Key::new(&key),
//                     None => {
//                         eprintln!("Expected key");
//                         return;
//                     }
//                 }
//             };
//             let value = {
//                 match args.next() {
//                     Some(value) => value.as_bytes().to_vec(),
//                     None => {
//                         eprintln!("Expected value");
//                         return;
//                     }
//                 }
//             };
//             let record = Record {
//                 key,
//                 value,
//                 publisher: None,
//                 expires: None,
//             };
//             kademlia.put_record(record, Quorum::One);
//         }
//         _ => {
//             eprintln!("expected GET or PUT");
//         }
//     }
// }

fn main() {}