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Fixed a few small errors

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This commit is contained in:
Arlo Filley 2023-11-21 10:24:09 +00:00
parent 587b2c6bdc
commit 92f477f901
3 changed files with 260 additions and 206 deletions
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3
.gitignore vendored
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@ -4,4 +4,5 @@ Cargo.lock
/testing
/process
/log
.DS_Store
.DS_Store
/downloads

37
src/main.rs
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@ -94,33 +94,36 @@ async fn main() {
let num_pieces = torrent.info.pieces.len() / 20;
let mut peer = match Peer::create_connection(peers[0]).await {
None => { return },
Some(peer) => peer
};
peer.handshake(&torrent).await;
peer.keep_alive_until_unchoke().await;
info!("Successfully Created Connection with peer: {}", peer.peer_id);
println!("{}", peers.len());
let mut len = 0;
for index in 0..num_pieces {
let piece= peer.request_piece(
index as u32, torrent.info.piece_length as u32,
&mut len, torrent.get_total_length() as u32
).await;
let mut i = 0;
let t = torrent.clone();
let (sender, mut reciever) = Peer::test(peers[0], torrent).await;
loop {
let _ = sender.send(peer::ControlMessage::DownloadPiece(i, t.info.piece_length as u32, len, t.get_total_length() as u32));
reciever.resubscribe();
let a = reciever.recv().await.unwrap();
if torrent.check_piece(&piece, index as u32) {
files.write_piece(piece).await;
println!("2 {a:?}");
let peer::ControlMessage::DownloadedPiece(b) = a else {
continue;
};
if t.check_piece(&b, i) {
files.write_piece(b).await;
} else {
break
}
}
peer.disconnect().await;
//peer.disconnect().await;
info!("Successfully completed download");

426
src/peer.rs
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@ -2,206 +2,256 @@
// Crate Imports
use crate::{
handshake::Handshake,
message::{ FromBuffer, Message, MessageType, ToBuffer },
torrent::Torrent
handshake::Handshake,
message::{ FromBuffer, Message, MessageType, ToBuffer },
torrent::Torrent
};
// External imports
use log::{ debug, error };
use std::net::{SocketAddr, SocketAddrV4};
use log::{ debug, error, info };
use std::{net::{SocketAddr, SocketAddrV4, Ipv4Addr}, sync::mpsc::Sender};
use tokio::{
io::{ AsyncReadExt, AsyncWriteExt },
net::TcpStream
io::{ AsyncReadExt, AsyncWriteExt, Ready },
net::TcpStream, sync::{oneshot, broadcast}, spawn,
sync::mpsc
};
/// Structure to abstract interaction with a peer.
pub struct Peer {
/// The `TcpStream` that is used to communicate with the peeer
connection_stream: TcpStream,
/// The `SocketAddr` of the peer
pub socket_addr: SocketAddrV4,
/// The id of the peer
pub peer_id: String,
/// Whether the peer is choking the client
pub choking: bool,
/// The `TcpStream` that is used to communicate with the peeer
connection_stream: TcpStream,
/// The `SocketAddr` of the peer
socket_addr: SocketAddrV4,
/// The id of the peer
pub peer_id: String,
/// Whether the peer is choking the client
choking: bool,
}
impl Peer {
/// Creates a connection to the peer.
///
/// # Arguments
///
/// * `socket_address` - The socket address of the peer.
pub async fn create_connection(socket_address: SocketAddrV4) -> Option<Self> {
let connection_stream = match TcpStream::connect(socket_address).await {
Err(err) => {
error!("unable to connect to {}, err: {}", socket_address, err);
return None
},
Ok(stream) => {
debug!("created tcpstream successfully to: {socket_address}");
stream
}
};
Some(Self {
connection_stream,
socket_addr: socket_address,
peer_id: String::new(),
choking: true,
})
}
/// Sends a handshake message to the peer, the first step in the peer wire messaging protocol.
///
/// # Arguments
///
/// * `torrent` - The `Torrent` instance associated with the peer.
pub async fn handshake(&mut self, torrent: &Torrent) {
let mut buf = vec![0; 1024];
let handshake_message = Handshake::new(&torrent.get_info_hash()).unwrap();
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&handshake_message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read(&mut buf).await.unwrap();
let handshake = Handshake::from_buffer(&buf[..68].to_vec()).unwrap();
handshake.log_useful_information();
for message_buf in Message::number_of_messages(&buf[68..]).0 {
let message = Message::from_buffer(&message_buf);
if message.message_type == MessageType::Unchoke {
self.choking = false;
}
}
self.peer_id = handshake.peer_id;
}
/// Keeps the connection alive and sends interested messages until the peer unchokes
pub async fn keep_alive_until_unchoke(&mut self) {
loop {
let message = self.read_message().await;
debug!("{message:?}");
match message.message_type {
MessageType::Unchoke => {
self.choking = false;
break
}
MessageType::KeepAlive => {
self.send_message_no_response(Message::new(0, MessageType::KeepAlive, None)).await;
self.send_message_no_response(Message::new(1, MessageType::Interested, None)).await;
}
MessageType::Choke => {
self.choking = true;
}
_ => { continue }
}
}
}
/// Sends a message to the peer and waits for a response, which it returns
pub async fn send_message(&mut self, message: Message) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Sends a message to the peer and waits for a response, which it returns
pub async fn send_message_exact_size_response(&mut self, message: Message, size: usize) -> Message {
let mut buf = vec![0; size];
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Sends a message but doesn't wait for a response
pub async fn send_message_no_response(&mut self, message: Message) {
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
}
/// reads a message from the peer
pub async fn read_message(&mut self) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Shutsdown the connection stream
pub async fn disconnect(&mut self) {
match self.connection_stream.shutdown().await {
Err(err) => {
error!("Error disconnecting from {}: {}", self.socket_addr, err);
panic!("Error disconnecting from {}: {}", self.socket_addr, err);
},
Ok(_) => {
debug!("Successfully disconnected from {}", self.socket_addr)
}
}
}
}
impl Peer {
// Sends the requests and reads responses to put a piece together
pub async fn request_piece(&mut self, index: u32, piece_length: u32, len: &mut u32, total_len: u32) -> Vec<u8> {
let mut buf = vec![];
// Sequentially requests piece from the peer
for offset in (0..piece_length).step_by(16_384) {
let mut length = 16_384;
let response: Message;
if *len + 16_384 >= total_len {
debug!("Final Request {}", total_len - *len);
length = total_len - *len;
/// Creates a connection to the peer.
///
/// # Arguments
///
/// * `socket_address` - The socket address of the peer.
pub async fn create_connection(socket_address: SocketAddrV4) -> Option<Self> {
let connection_stream = match TcpStream::connect(socket_address).await {
Err(err) => {
error!("unable to connect to {}, err: {}", socket_address, err);
return None
},
Ok(stream) => {
debug!("created tcpstream successfully to: {socket_address}");
stream
}
};
response = self.send_message_exact_size_response(
Message::create_request(index, offset, length),
length as usize + 13
).await;
} else {
response = self.send_message(Message::create_request(index, offset, length)).await;
};
match response.message_type {
MessageType::Piece => {
let mut data = response.payload.unwrap();
*len += data.len() as u32;
*len -= 8;
for byte in data.drain(..).skip(8) {
buf.push(byte)
}
},
_ => { debug!("didn't recieve expected piece request | Recieved: {:?}", response.message_type); }
};
if *len >= total_len - 1 {
return buf;
}
Some(Self {
connection_stream,
socket_addr: socket_address,
peer_id: String::new(),
choking: true,
})
}
}
#[derive(Clone, Debug)]
pub enum ControlMessage {
DownloadPiece(u32, u32, u32, u32),
DownloadedPiece(Vec<u8>)
}
impl Peer {
pub async fn test(address: SocketAddrV4, torrent: Torrent) -> (broadcast::Sender<ControlMessage>, broadcast::Receiver<ControlMessage>) {
let (sender, mut receiver) = broadcast::channel::<ControlMessage>(16);
let sx1 = sender.clone();
let rx1 = receiver.resubscribe();
let t = torrent.clone();
spawn(async move {
let mut peer = match Peer::create_connection(address).await {
None => { return },
Some(peer) => peer
};
peer.handshake(&torrent).await;
peer.keep_alive_until_unchoke().await;
info!("Successfully Created Connection with peer: {}", peer.peer_id);
loop {
if receiver.is_empty() {
continue
} else {
let Ok(m) = receiver.recv().await else {
continue;
};
println!("{m:#?}");
match m {
ControlMessage::DownloadPiece(a, b, mut c, d) => {
let buf = peer.request_piece(a, b, &mut c, d).await;
let _ = sender.send(ControlMessage::DownloadedPiece(buf));
}
_ => ()
}
}
}
});
(sx1, rx1)
}
buf
}
/// Sends a handshake message to the peer, the first step in the peer wire messaging protocol.
///
/// # Arguments
///
/// * `torrent` - The `Torrent` instance associated with the peer.
async fn handshake(&mut self, torrent: &Torrent) {
let mut buf = vec![0; 1024];
let handshake_message = Handshake::new(&torrent.get_info_hash()).unwrap();
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&handshake_message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read(&mut buf).await.unwrap();
let handshake = Handshake::from_buffer(&buf[..68].to_vec()).unwrap();
handshake.log_useful_information();
for message_buf in Message::number_of_messages(&buf[68..]).0 {
let message = Message::from_buffer(&message_buf);
if message.message_type == MessageType::Unchoke {
self.choking = false;
}
}
self.peer_id = handshake.peer_id;
}
/// Keeps the connection alive and sends interested messages until the peer unchokes
async fn keep_alive_until_unchoke(&mut self) {
loop {
let message = self.read_message().await;
debug!("{message:?}");
match message.message_type {
MessageType::Unchoke => {
self.choking = false;
break
}
MessageType::KeepAlive => {
self.send_message_no_response(Message::new(0, MessageType::KeepAlive, None)).await;
self.send_message_no_response(Message::new(1, MessageType::Interested, None)).await;
}
MessageType::Choke => {
self.choking = true;
}
_ => { continue }
}
}
}
/// Sends a message to the peer and waits for a response, which it returns
async fn send_message(&mut self, message: Message) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Sends a message to the peer and waits for a response, which it returns
async fn send_message_exact_size_response(&mut self, message: Message, size: usize) -> Message {
let mut buf = vec![0; size];
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Sends a message but doesn't wait for a response
async fn send_message_no_response(&mut self, message: Message) {
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
}
/// reads a message from the peer
async fn read_message(&mut self) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read(&mut buf).await.unwrap();
Message::from_buffer(&buf)
}
/// Shutsdown the connection stream
async fn disconnect(&mut self) {
match self.connection_stream.shutdown().await {
Err(err) => {
error!("Error disconnecting from {}: {}", self.socket_addr, err);
panic!("Error disconnecting from {}: {}", self.socket_addr, err);
},
Ok(_) => {
debug!("Successfully disconnected from {}", self.socket_addr)
}
}
}
}
impl Peer {
// Sends the requests and reads responses to put a piece together
pub async fn request_piece(&mut self, index: u32, piece_length: u32, len: &mut u32, total_len: u32) -> Vec<u8> {
let mut buf = vec![];
// Sequentially requests piece from the peer
for offset in (0..piece_length).step_by(16_384) {
let mut length = 16_384;
let response: Message;
if *len + 16_384 >= total_len {
debug!("Final Request {}", total_len - *len);
length = total_len - *len;
response = self.send_message_exact_size_response(
Message::create_request(index, offset, length),
length as usize + 13
).await;
} else {
response = self.send_message(Message::create_request(index, offset, length)).await;
};
match response.message_type {
MessageType::Piece => {
let mut data = response.payload.unwrap();
*len += data.len() as u32;
*len -= 8;
for byte in data.drain(..).skip(8) {
buf.push(byte)
}
},
_ => { debug!("didn't recieve expected piece request | Recieved: {:?}", response.message_type); }
};
if *len >= total_len - 1 {
return buf;
}
}
buf
}
}