use std::{error, fmt, io};
use futures_channel::mpsc;
use crate::resp;
#[derive(Debug)]
pub enum Error {
Internal(String),
IO(io::Error),
Resp(String, Option<resp::RespValue>),
Remote(String),
Connection(ConnectionReason),
Unexpected(String),
#[cfg(feature = "with-rustls")]
InvalidDnsName,
#[cfg(feature = "with-native-tls")]
Tls(native_tls::Error),
}
pub(crate) fn internal(msg: impl Into<String>) -> Error {
Error::Internal(msg.into())
}
pub(crate) fn unexpected(msg: impl Into<String>) -> Error {
Error::Unexpected(msg.into())
}
pub(crate) fn resp(msg: impl Into<String>, resp: resp::RespValue) -> Error {
Error::Resp(msg.into(), Some(resp))
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::IO(err)
}
}
impl<T: 'static + Send> From<mpsc::TrySendError<T>> for Error {
fn from(err: mpsc::TrySendError<T>) -> Error {
Error::Unexpected(format!("Cannot write to channel: {}", err))
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Error::IO(err) => Some(err),
_ => None,
}
}
}
#[cfg(feature = "with-native-tls")]
impl From<native_tls::Error> for Error {
fn from(err: native_tls::Error) -> Error {
Error::Tls(err)
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::Internal(s) => write!(f, "{}", s),
Error::IO(err) => write!(f, "{}", err),
Error::Resp(s, resp) => write!(f, "{}: {:?}", s, resp),
Error::Remote(s) => write!(f, "{}", s),
Error::Connection(ConnectionReason::Connected) => {
write!(f, "Connection already established")
}
Error::Connection(ConnectionReason::Connecting) => write!(f, "Connection in progress"),
Error::Connection(ConnectionReason::ConnectionFailed) => {
write!(f, "The last attempt to establish a connection failed")
}
Error::Connection(ConnectionReason::NotConnected) => {
write!(f, "Connection has been closed")
}
#[cfg(feature = "with-rustls")]
Error::InvalidDnsName => {
write!(f, "Invalid dns name")
}
#[cfg(feature = "with-native-tls")]
Error::Tls(err) => write!(f, "{}", err),
Error::Unexpected(err) => write!(f, "{}", err),
}
}
}
#[derive(Debug)]
pub enum ConnectionReason {
Connecting,
Connected,
ConnectionFailed,
NotConnected,
}