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use self::Error::*;
use base64::DecodeError;
use native_tls;
use nom;
use smtp::response::{Response, Severity};
use std::error::Error as StdError;
use std::fmt;
use std::fmt::{Display, Formatter};
use std::io;
use std::string::FromUtf8Error;
#[derive(Debug)]
pub enum Error {
Transient(Response),
Permanent(Response),
ResponseParsing(&'static str),
ChallengeParsing(DecodeError),
Utf8Parsing(FromUtf8Error),
Client(&'static str),
Resolution,
Io(io::Error),
Tls(native_tls::Error),
Parsing(nom::simple_errors::Err),
}
impl Display for Error {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), fmt::Error> {
fmt.write_str(self.description())
}
}
impl StdError for Error {
#[cfg_attr(feature = "cargo-clippy", allow(match_same_arms))]
fn description(&self) -> &str {
match *self {
Transient(ref err) => match err.first_line() {
Some(line) => line,
None => "undetailed transient error during SMTP transaction",
},
Permanent(ref err) => match err.first_line() {
Some(line) => line,
None => "undetailed permanent error during SMTP transaction",
},
ResponseParsing(err) => err,
ChallengeParsing(ref err) => err.description(),
Utf8Parsing(ref err) => err.description(),
Resolution => "could not resolve hostname",
Client(err) => err,
Io(ref err) => err.description(),
Tls(ref err) => err.description(),
Parsing(ref err) => err.description(),
}
}
fn cause(&self) -> Option<&StdError> {
match *self {
ChallengeParsing(ref err) => Some(&*err),
Utf8Parsing(ref err) => Some(&*err),
Io(ref err) => Some(&*err),
Tls(ref err) => Some(&*err),
Parsing(ref err) => Some(&*err),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Io(err)
}
}
impl From<native_tls::Error> for Error {
fn from(err: native_tls::Error) -> Error {
Tls(err)
}
}
impl From<nom::simple_errors::Err> for Error {
fn from(err: nom::simple_errors::Err) -> Error {
Parsing(err)
}
}
impl From<Response> for Error {
fn from(response: Response) -> Error {
match response.code.severity {
Severity::TransientNegativeCompletion => Transient(response),
Severity::PermanentNegativeCompletion => Permanent(response),
_ => Client("Unknown error code"),
}
}
}
impl From<&'static str> for Error {
fn from(string: &'static str) -> Error {
Client(string)
}
}
pub type SmtpResult = Result<Response, Error>;