_ Git - dnsseed-rust/blob - src/peer.rs

   1 use std::cmp;
   2 use std::net::SocketAddr;
   3 use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
   4
   5 use bitcoin::consensus::encode;
   6 use bitcoin::consensus::encode::{Decodable, Encodable};
   7 use bitcoin::network::address::Address;
   8 use bitcoin::network::constants::Network;
   9 use bitcoin::network::message::{RawNetworkMessage, NetworkMessage};
  10 use bitcoin::network::message_network::VersionMessage;
  11
  12 use tokio::prelude::*;
  13 use tokio::codec;
  14 use tokio::codec::Framed;
  15 use tokio::net::TcpStream;
  16 use tokio::timer::Delay;
  17
  18 use futures::sync::mpsc;
  19
  20 use crate::printer::Printer;
  21 use crate::timeout_stream::TimeoutStream;
  22
  23 struct BytesCoder<'a>(&'a mut bytes::BytesMut);
  24 impl<'a> std::io::Write for BytesCoder<'a> {
  25         fn write(&mut self, b: &[u8]) -> Result<usize, std::io::Error> {
  26                 self.0.extend_from_slice(&b);
  27                 Ok(b.len())
  28         }
  29         fn flush(&mut self) -> Result<(), std::io::Error> {
  30                 Ok(())
  31         }
  32 }
  33 struct BytesDecoder<'a> {
  34         buf: &'a mut bytes::BytesMut,
  35         pos: usize,
  36 }
  37 impl<'a> std::io::Read for BytesDecoder<'a> {
  38         fn read(&mut self, b: &mut [u8]) -> Result<usize, std::io::Error> {
  39                 let copy_len = cmp::min(b.len(), self.buf.len() - self.pos);
  40                 b[..copy_len].copy_from_slice(&self.buf[self.pos..self.pos + copy_len]);
  41                 self.pos += copy_len;
  42                 Ok(copy_len)
  43         }
  44 }
  45
  46 struct MsgCoder<'a>(&'a Printer);
  47 impl<'a> codec::Decoder for MsgCoder<'a> {
  48         type Item = NetworkMessage;
  49         type Error = std::io::Error;
  50
  51         fn decode(&mut self, bytes: &mut bytes::BytesMut) -> Result<Option<NetworkMessage>, std::io::Error> {
  52                 let mut decoder = BytesDecoder {
  53                         buf: bytes,
  54                         pos: 0
  55                 };
  56                 match RawNetworkMessage::consensus_decode(&mut decoder) {
  57                         Ok(res) => {
  58                                 decoder.buf.advance(decoder.pos);
  59                                 if res.magic == Network::Bitcoin.magic() {
  60                                         Ok(Some(res.payload))
  61                                 } else {
  62                                         Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "bad net magic"))
  63                                 }
  64                         },
  65                         Err(e) => match e {
  66                                 encode::Error::Io(_) => Ok(None),
  67                                 encode::Error::UnrecognizedNetworkCommand(_msg) => {
  68                                         decoder.buf.advance(decoder.pos);
  69                                         //XXX(fixthese): self.0.add_line(format!("rust-bitcoin doesn't support {}!", msg), true);
  70                                         Ok(None)
  71                                 },
  72                                 _ => {
  73                                         self.0.add_line(format!("Error decoding message: {:?}", e), true);
  74                                         Err(std::io::Error::new(std::io::ErrorKind::InvalidData, e))
  75                                 },
  76                         }
  77                 }
  78         }
  79 }
  80 impl<'a> codec::Encoder for MsgCoder<'a> {
  81         type Item = NetworkMessage;
  82         type Error = std::io::Error;
  83
  84         fn encode(&mut self, msg: NetworkMessage, res: &mut bytes::BytesMut) -> Result<(), std::io::Error> {
  85                 if let Err(_) = (RawNetworkMessage {
  86                         magic: Network::Bitcoin.magic(),
  87                         payload: msg,
  88                 }.consensus_encode(&mut BytesCoder(res))) {
  89                         //XXX
  90                 }
  91                 Ok(())
  92         }
  93 }
  94
  95 pub struct Peer {}
  96 impl Peer {
  97         pub fn new(addr: SocketAddr, timeout: Duration, printer: &'static Printer) -> impl Future<Error=(), Item=(mpsc::Sender<NetworkMessage>, impl Stream<Item=NetworkMessage, Error=std::io::Error>)> {
  98                 let connect_timeout = Delay::new(Instant::now() + timeout.clone()).then(|_| {
  99                         future::err(std::io::Error::new(std::io::ErrorKind::TimedOut, "timeout reached"))
 100                 });
 101                 TcpStream::connect(&addr).select(connect_timeout)
 102                         .or_else(move |_| {
 103                                 Delay::new(Instant::now() + timeout / 10).then(|_| {
 104                                         future::err(())
 105                                 })
 106                         }).and_then(move |stream| {
 107                                 let (write, read) = Framed::new(stream.0, MsgCoder(printer)).split();
 108                                 let (mut sender, receiver) = mpsc::channel(10); // We never really should send more than 10 messages unless they're dumb
 109                                 tokio::spawn(write.sink_map_err(|_| { () }).send_all(receiver)
 110                                         .then(|_| {
 111                                                 future::err(())
 112                                         }));
 113                                 let _ = sender.try_send(NetworkMessage::Version(VersionMessage {
 114                                         version: 70015,
 115                                         services: (1 << 3), // NODE_WITNESS
 116                                         timestamp: SystemTime::now().duration_since(UNIX_EPOCH).expect("time > 1970").as_secs() as i64,
 117                                         receiver: Address::new(&addr, 0),
 118                                         sender: Address::new(&"0.0.0.0:0".parse().unwrap(), 0),
 119                                         nonce: 0xdeadbeef,
 120                                         user_agent: "/rust-bitcoin:0.18/bluematt-tokio-client:0.1/".to_string(),
 121                                         start_height: 0,
 122                                         relay: true,
 123                                 }));
 124                                 future::ok((sender, TimeoutStream::new(read, timeout)))
 125                         })
 126         }
 127 }