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UDP Doubler
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extern crate futures; | |
extern crate tokio_core; | |
extern crate env_logger; | |
use std::str; | |
use std::io::{Result, Error, ErrorKind, Write}; | |
use std::net::SocketAddr; | |
use futures::{Stream, Sink}; | |
use tokio_core::net::{UdpSocket, UdpCodec}; | |
use tokio_core::reactor::Core; | |
pub struct IntCodec; | |
impl UdpCodec for IntCodec { | |
type In = (SocketAddr, u64); | |
type Out = (SocketAddr, u64); | |
fn decode(&mut self, addr: &SocketAddr, buf: &[u8]) -> Result<Self::In> { | |
fn parse_u64(buf: &[u8]) -> Result<u64> { | |
str::from_utf8(buf) | |
.map_err(|e| Error::new(ErrorKind::InvalidData, e))? | |
.trim() | |
.parse() | |
.map_err(|e| Error::new(ErrorKind::InvalidData, e)) | |
} | |
Ok((*addr, parse_u64(buf)?)) | |
} | |
fn encode(&mut self, (addr, num): Self::Out, into: &mut Vec<u8>) -> SocketAddr { | |
writeln!(into, "{}", num).unwrap(); | |
addr | |
} | |
} | |
fn main() { | |
drop(env_logger::init()); | |
let mut core = Core::new().unwrap(); | |
let handle = core.handle(); | |
let addr: SocketAddr = "0.0.0.0:5682".parse().unwrap(); | |
let sock = UdpSocket::bind(&addr, &handle).unwrap(); | |
let (sink, stream) = sock.framed(IntCodec).split(); | |
let stream = stream.map(|(addr, num)| (addr, num * 2)); | |
let sock = sink.send_all(stream); | |
drop(core.run(sock)); | |
} |
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