68 lines
1.6 KiB
Rust
68 lines
1.6 KiB
Rust
#![feature(backtrace)]
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extern crate hptp;
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extern crate tokio;
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#[macro_use]
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extern crate thiserror;
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use hptp::log::Logger;
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use hptp::msg::Msg;
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use hptp::peer::Peer;
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use tokio::io::AsyncWrite;
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#[derive(Error, Debug)]
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enum Error {
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#[error("io error: {source}")]
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Io {
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#[from]
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source: tokio::io::Error,
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backtrace: std::backtrace::Backtrace,
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},
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#[error("no UDP port available for listening")]
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NoPortAvail,
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}
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fn entry() -> Result<(), Error> {
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let mut rt = tokio::runtime::Runtime::new().unwrap();
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let mut log = Logger::new();
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rt.block_on(start(&mut log))
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}
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fn main() {
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if let Err(e) = entry() {
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use std::error::Error;
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println!("Error: {}", e);
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for bt in e.backtrace() {
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println!("{}", bt);
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}
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}
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}
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async fn start(log: &mut Logger) -> Result<(), Error> {
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let sock = hptp::udp_retrying_bind(16, hptp::random_port)
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.await
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.map_err(|_| Error::NoPortAvail)?;
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log.bound(sock.local_addr()?.port()).await;
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let mut out = tokio::io::stdout();
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let mut peer = Peer::new(sock);
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download(log, &mut peer, &mut out).await
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}
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async fn download<OUT>(log: &mut Logger, peer: &mut Peer, out: &mut OUT) -> Result<(), Error>
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where
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OUT: AsyncWrite + Unpin,
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{
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use tokio::io::AsyncWriteExt;
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let mut pos = 0;
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loop {
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match peer.recv().await? {
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Msg::Data(data) => {
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let len = data.len();
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out.write_all(&data).await?;
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out.flush().await?;
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log.recv_data_accepted(pos, len, hptp::log::InOrder).await;
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pos += len;
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}
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}
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}
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}
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