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use amq_protocol::{
frame::GenError,
protocol::AMQPClass,
};
use failure::{Backtrace, Context, Fail};
use std::{fmt, io};
use crate::{
channel_status::ChannelState,
connection_status::ConnectionState,
};
#[derive(Debug)]
pub struct Error {
inner: Context<ErrorKind>,
}
#[derive(Debug)]
pub enum ErrorKind {
InvalidMethod(AMQPClass),
InvalidChannel(u16),
ConnectionRefused,
NotConnected,
UnexpectedReply,
PreconditionFailed,
ChannelLimitReached,
InvalidChannelState(ChannelState),
InvalidConnectionState(ConnectionState),
ParsingError(String),
SerialisationError(GenError),
IOError(io::Error),
#[doc(hidden)]
__Nonexhaustive,
}
impl fmt::Display for ErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use ErrorKind::*;
match self {
InvalidMethod(method) => write!(f, "invalid protocol method: {:?}", method),
InvalidChannel(channel) => write!(f, "invalid channel: {}", channel),
ConnectionRefused => write!(f, "connection refused"),
NotConnected => write!(f, "not connected"),
UnexpectedReply => write!(f, "unexpected reply"),
PreconditionFailed => write!(f, "precondition failed"),
ChannelLimitReached => write!(f, "The maximum number of channels for this connection has been reached"),
InvalidChannelState(state) => write!(f, "invalid channel state: {:?}", state),
InvalidConnectionState(state) => write!(f, "invalid connection state: {:?}", state),
ParsingError(e) => write!(f, "Failed to parse: {}", e),
SerialisationError(e) => write!(f, "Failed to serialise: {:?}", e),
IOError(e) => write!(f, "IO error: {:?}", e),
__Nonexhaustive => write!(f, "lapin::error::ErrorKind::__Nonexhaustive: this should not be printed"),
}
}
}
impl Fail for ErrorKind {
fn cause(&self) -> Option<&dyn Fail> {
match self {
ErrorKind::SerialisationError(cause) => Some(cause),
ErrorKind::IOError(cause) => Some(cause),
_ => None,
}
}
}
impl Error {
pub fn kind(&self) -> &ErrorKind {
self.inner.get_context()
}
}
impl Fail for Error {
fn cause(&self) -> Option<&dyn Fail> {
self.inner.cause()
}
fn backtrace(&self) -> Option<&Backtrace> {
self.inner.backtrace()
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self.inner, f)
}
}
impl From<ErrorKind> for Error {
fn from(kind: ErrorKind) -> Error {
Error { inner: Context::new(kind) }
}
}
impl From<Context<ErrorKind>> for Error {
fn from(inner: Context<ErrorKind>) -> Error {
Error { inner }
}
}