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2020-03-16 19:13:00 +03:00
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examples/distributed-key-value-store.rs
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// Copyright 20l9 Parity Technologies (UK) Ltd.
// // 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.
//
// 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:
// //! 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.
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 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},
// };
//
// 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.
// 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");
// }
// }
// }
//! 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::kad::record::store::MemoryStore;
use libp2p::kad::{record::Key, Kademlia, KademliaEvent, PutRecordOk, Quorum, Record};
use libp2p::{
NetworkBehaviour,
PeerId,
Swarm,
build_development_transport,
identity,
mdns::{Mdns, MdnsEvent},
swarm::NetworkBehaviourEventProcess
};
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)?;
// 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 kademlia = Kademlia::new(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() {}