code.octet-stream.net Git - m17rt/blob - m17app/src/tnc.rs

   1 use std::io::{Read, Write};
   2
   3 /// A TNC that supports reading and writing M17 KISS messages.
   4 ///
   5 /// TNCs must be cloneable to support reading and writing from different threads,
   6 /// via a working implementation of try_clone(). We do not require `Clone` directly
   7 /// as this could not be fulfilled by `TcpStream`.
   8 pub trait Tnc: Read + Write + Sized + Send + 'static {
   9     fn try_clone(&mut self) -> Result<Self, TncError>;
  10     fn start(&mut self) -> Result<(), TncError>;
  11     fn close(&mut self) -> Result<(), TncError>;
  12 }
  13
  14 #[derive(Debug, PartialEq, Eq, Clone)]
  15 pub enum TncError {
  16     // TODO: Good error cases
  17     Unknown,
  18 }
  19
  20 impl Tnc for std::net::TcpStream {
  21     fn try_clone(&mut self) -> Result<Self, TncError> {
  22         self.try_clone().map_err(|_| TncError::Unknown)
  23     }
  24
  25     fn start(&mut self) -> Result<(), TncError> {
  26         // already started, hopefully we get onto reading the socket quickly
  27         Ok(())
  28     }
  29
  30     fn close(&mut self) -> Result<(), TncError> {
  31         self.shutdown(std::net::Shutdown::Both)
  32             .map_err(|_| TncError::Unknown)
  33     }
  34 }