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use std::error;
use std::error::Error as StdError;
use std::fmt;
use std::io;
use error::ErrorStack;
/// An SSL error.
#[derive(Debug)]
pub enum Error {
/// The SSL session has been closed by the other end
ZeroReturn,
/// An attempt to read data from the underlying socket returned
/// `WouldBlock`. Wait for read readiness and reattempt the operation.
WantRead(io::Error),
/// An attempt to write data from the underlying socket returned
/// `WouldBlock`. Wait for write readiness and reattempt the operation.
WantWrite(io::Error),
/// The client certificate callback requested to be called again.
WantX509Lookup,
/// An error reported by the underlying stream.
Stream(io::Error),
/// An error in the OpenSSL library.
Ssl(ErrorStack),
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
try!(fmt.write_str(self.description()));
if let Some(err) = self.cause() {
write!(fmt, ": {}", err)
} else {
Ok(())
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
match *self {
Error::ZeroReturn => "The SSL session was closed by the other end",
Error::WantRead(_) => "A read attempt returned a `WouldBlock` error",
Error::WantWrite(_) => "A write attempt returned a `WouldBlock` error",
Error::WantX509Lookup => "The client certificate callback requested to be called again",
Error::Stream(_) => "The underlying stream reported an error",
Error::Ssl(_) => "The OpenSSL library reported an error",
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::WantRead(ref err) => Some(err),
Error::WantWrite(ref err) => Some(err),
Error::Stream(ref err) => Some(err),
Error::Ssl(ref err) => Some(err),
_ => None,
}
}
}
impl From<ErrorStack> for Error {
fn from(e: ErrorStack) -> Error {
Error::Ssl(e)
}
}
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