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//! Module containing all custom errors.
use std::{io as std_io};
use new_tokio_smtp::error::{ConnectingFailed, LogicError};
use mail::error::MailError;
/// Error used when sending a mail fails.
///
/// Failing to encode a mail before sending
/// it also counts as a `MailSendError`, as
/// it's done "on the fly" when sending a mail.
#[derive(Debug, Fail)]
pub enum MailSendError {
/// Creating the mail failed.
///
/// This can happen for a number of reasons including:
///
/// 1. Missing header fields.
/// 2. Invalid header fields.
/// 2. Encoding header fields fails.
/// 3. Loading resources failed (resources like e.g. appendix, logo embedded in html mail, etc.)
#[fail(display = "{}", _0)]
Mail(MailError),
/// Sending the mail failed.
///
/// This can happen for a number of reasons including:
/// 1. Server rejects mail transaction because of send or receiver
/// address or body data (e.g. body to long).
/// 2. Mail address requires smtputf8 support, which is not given.
/// 3. Server rejects sending the mail for other reasons (it's
/// closing, overloaded etc.).
#[fail(display = "{}", _0)]
Smtp(LogicError)
}
impl From<MailError> for MailSendError {
fn from(err: MailError) -> Self {
MailSendError::Mail(err)
}
}
impl From<LogicError> for MailSendError {
fn from(err: LogicError) -> Self {
MailSendError::Smtp(err)
}
}
/// Error returned when something on the transport layer failed.
///
/// Thinks causing this error include:
///
/// - TLS required but not supported by server
/// - authentication not valid
/// - connection "broke" (e.g. because you
/// internet connection is gone or the server
/// crashed)
///
#[derive(Debug, Fail)]
pub enum TransportError {
/// Setting up the connection failed.
///
/// Failures can include but are not limited to:
///
/// - Connecting with TCP failed.
/// - Starting TLS failed.
/// - Server does not want to be used (e.g. failure on sending EHLO).
/// - Authentication failed.
#[fail(display = "{}", _0)]
Connecting(ConnectingFailed),
/// An I/O error happened while using the connection.
///
/// This is mainly for I/O errors after the setup of the connection
/// was successful, which normally includes sending Ehlo and Auth
/// commands.
#[fail(display = "{}", _0)]
Io(std_io::Error)
}
impl From<std_io::Error> for TransportError {
fn from(err: std_io::Error) -> Self {
TransportError::Io(err)
}
}
impl From<ConnectingFailed> for TransportError {
fn from(err: ConnectingFailed) -> Self {
TransportError::Connecting(err)
}
}
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