// Short-hand for constructing an Error, saves some typing and import madness macro_rules! err { ($n:tt) => { crate::err::Error(Box::new(crate::err::ErrorImpl::$n)) }; ($n:tt, $e:expr) => { crate::err::Error(Box::new(crate::err::ErrorImpl::$n($e))) }; } #[derive(Debug)] pub struct Error(pub(crate) Box); #[derive(Debug)] pub(crate) enum ErrorImpl { IO(std::io::Error), // This could use some context ProcShutdown(std::process::ExitStatus), ProcTimeout, Status(crate::sock::ReplyLine), Parse, // This could be more specific Keyword(String), } impl std::fmt::Display for Error { fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { use ErrorImpl::*; match &*self.0 { IO(e) => write!(f, "IO error: {}", e), ProcShutdown(s) => write!(f, "Tor process unexpectedly shutdown with code {}", s), ProcTimeout => write!(f, "Timeout while waiting for Tor process to start"), Status(s) => write!(f, "Unexpected reply ({})", s), Parse => write!(f, "Error parsing reply"), Keyword(s) => write!(f, "Invalid keyword '{}'", s), } } } impl From for Error { fn from(e: std::io::Error) -> Error { err!(IO, e) } } pub type Result = std::result::Result;