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|
use std::sync::{Arc, Weak};
use serde::{Deserialize, Serialize};
use futures::{SinkExt, StreamExt};
use tokio::{
net::{TcpListener, TcpStream},
spawn,
sync::Mutex,
};
use tokio_serde::{Framed, formats::Json};
use tokio_util::codec::Framed as TokioFramed;
use tokio_util::codec::LengthDelimitedCodec;
use crate::{
blocks::{Block, BlockChain},
client::Client,
};
#[derive(Deserialize, Serialize, Clone)]
pub enum Request {
Block(Block),
Ibd(Option<BlockChain>),
}
pub struct Network {
this: Weak<Mutex<Self>>,
me: Client,
listener: Arc<TcpListener>,
peers: Vec<Arc<Mutex<Peer>>>,
blockchain: Arc<Mutex<BlockChain>>,
}
impl Network {
pub async fn new(blockchain: Arc<Mutex<BlockChain>>) -> Arc<Mutex<Self>> {
let listener = TcpListener::bind("0.0.0.0:6767")
.await
.unwrap();
let this = Arc::new(Mutex::new(Self {
me: Client::default(),
this: Weak::new(),
listener: Arc::new(listener),
peers: Vec::default(),
blockchain,
}));
this.lock()
.await
.this = Arc::downgrade(&this);
this
}
async fn try_peer(&mut self) {
let peer = Arc::new(Mutex::new(Peer::new(
self.this
.clone(),
TcpStream::connect("192.168.143.90:6767")
.await
.unwrap(),
)));
self.peers
.push(Arc::clone(&peer));
spawn(async move {
peer.lock()
.await
.start()
.await;
});
}
pub fn start(&self) {
let this = self
.this
.clone();
let listener = self
.listener
.clone();
spawn(async move {
loop {
let (stream, _addr) = listener
.accept()
.await
.unwrap();
let peer = Arc::new(Mutex::new(Peer::new(this.clone(), stream)));
if let Some(parent) = this.upgrade() {
let mut net = parent
.lock()
.await;
net.peers
.push(Arc::clone(&peer));
}
spawn({
let peer = Arc::clone(&peer);
async move {
peer.lock()
.await
.start()
.await;
}
});
}
});
let this = self
.this
.clone();
spawn(async move {
if let Some(parent) = this.upgrade() {
let mut net = parent
.lock()
.await;
net.try_peer()
.await;
}
});
}
pub async fn broadcast(&mut self, data: Request) {
for p in &self.peers {
p.lock()
.await
.framed
.send(data.clone())
.await
.unwrap();
}
}
}
struct Peer {
parent: Weak<Mutex<Network>>,
framed: Framed<TokioFramed<TcpStream, LengthDelimitedCodec>, Request, Request, Json<Request, Request>>,
}
impl Peer {
fn new(parent: Weak<Mutex<Network>>, stream: TcpStream) -> Self {
Self {
parent,
framed: Framed::new(TokioFramed::new(stream, LengthDelimitedCodec::new()), Json::default()),
}
}
async fn start(&mut self) {
loop {
while let Some(req) = self
.framed
.next()
.await
{
self.handle(req.unwrap())
.await;
}
}
}
async fn handle(&mut self, req: Request) {
match req {
Request::Block(mut block) => match block.pow {
Some(pow) => {
if !block.verify_pow() {
eprintln!("Rejecting remote block, POW verification failed"); // TODO: log remote IP
return;
}
self.parent
.upgrade()
.unwrap()
.lock()
.await
.blockchain
.lock()
.await
.store(block)
}
None => {
block.calc_set_pow();
let parent = self
.parent
.upgrade()
.unwrap();
let mut parent = parent
.lock()
.await;
parent
.broadcast(Request::Block(block))
.await;
}
},
Request::Ibd(bc) => match bc {
Some(bc) => {
let parent = self
.parent
.upgrade()
.unwrap();
let parent = parent
.lock()
.await;
let mut self_bc = parent
.blockchain
.lock()
.await;
// verify if our blocks match theirs
if *self_bc != bc {
eprintln!("Remote IBD broadcast did not match ours") // TODO: log IP of sender
// TODO: verify POWs, prev_hash of theirs(check missing), verify our POWs and if they have more blocks if their's all correct
// TODO: maybe queue and see if everybody else's blockchain match and is verified and has more block
}
}
None => {
let parent = self
.parent
.upgrade()
.unwrap();
let mut parent = parent
.lock()
.await;
let bc = {
let guard = parent
.blockchain
.lock()
.await;
guard.clone()
};
parent
.broadcast(Request::Ibd(Some(bc)))
.await;
}
},
}
}
}
|
