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fixed spaces, added telnet example, and properly returned errors

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This commit is contained in:
Andy Gauge 2017-05-19 11:45:31 -07:00
parent 0436206ec1
commit e5c7db1d10
1 changed files with 12 additions and 14 deletions
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26
src/net.md
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@ -561,7 +561,7 @@ up.
#[macro_use]
extern crate error_chain;
use std::net::{SocketAddrV4, Ipv4Addr,TcpListener};
use std::net::{SocketAddrV4, Ipv4Addr, TcpListener};
use std::io::Read;
error_chain! {
@ -570,23 +570,19 @@ error_chain! {
}
}
fn run() -> Result<()>{
let loopback = Ipv4Addr::new(127,0,0,1);
fn run() -> Result<()> {
let loopback = Ipv4Addr::new(127, 0, 0, 1);
// Assigning port 0 requests the OS to assign a free port
let socket = SocketAddrV4::new(loopback, 0);
let listen = TcpListener::bind(socket)?;
let port = listen.local_addr()?;
println!("Listening on {}, access this port to end the program", port);
match listen.accept() {
Ok((mut tcp_stream, addr)) => {
// read from the socket until connection closed by client.
let mut input = String::new();
let _ = tcp_stream.read_to_string(&mut input); //discard byte count
println!("Connection received! \r\n{:?} says {}", addr, input);
Ok(())
},
Err(e) => { Err(e.into()) }
}
let (mut tcp_stream, addr) = listen.accept()?; //block until requested
let mut input = String::new();
// read from the socket until connection closed by client.
let _ = tcp_stream.read_to_string(&mut input)?; //discard byte count
println!("Connection received! \r\n{:?} says {}", addr, input);
Ok(())
}
quick_main!(run);
@ -604,7 +600,9 @@ The rest of the recipe prints out the request made on the socket.
`TcpListener::accept` returns a tuple of `TcpStream` and client information
within a `Result`. The `Read` implmentation is used on that `TcpStream` to
collect the request payload. Closing the program is as easy as browsing to the
ip:port or using telnet to send some data, pressing ctrl-] and typing quit.
ip:port or using `telnet ip port` to send some data. For example, if the
program shows Listening on 127.0.0.1:11500, run `telnet 127.0.0.1 11500`. After
sending data in telnet press `ctrl-]` and type `quit`.
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