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use std::error;
use std::fmt;
use std::io;
use std::result;
use std::string::FromUtf8Error;
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
IncorrectPacketFormat,
InvalidTopicPath,
UnsupportedProtocolName,
UnsupportedProtocolVersion,
UnsupportedQualityOfService,
UnsupportedPacketType,
UnsupportedConnectReturnCode,
PayloadSizeIncorrect,
PayloadTooLong,
PayloadRequired,
TopicNameMustNotContainNonUtf8,
TopicNameMustNotContainWildcard,
MalformedRemainingLength,
UnexpectedEof,
Io(io::Error),
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::Io(err)
}
}
impl From<FromUtf8Error> for Error {
fn from(_: FromUtf8Error) -> Error {
Error::TopicNameMustNotContainNonUtf8
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::write(f, format_args!("{:?}", *self))
}
}
impl error::Error for Error {
fn description<'a>(&'a self) -> &'a str {
match *self {
Error::IncorrectPacketFormat => "Incorrect Packet Format",
Error::InvalidTopicPath => "Invalid Topic Path",
Error::UnsupportedProtocolName => "Unsupported Protocol Name",
Error::UnsupportedProtocolVersion => "Unsupported Protocol Version",
Error::UnsupportedQualityOfService => "Unsupported Quality Of Service",
Error::UnsupportedPacketType => "Unsupported Packet Type",
Error::UnsupportedConnectReturnCode => "Unsupported Connect Return Code",
Error::PayloadSizeIncorrect => "Payload Size Incorrect",
Error::PayloadTooLong => "Payload Too Long",
Error::PayloadRequired => "Payload Required",
Error::TopicNameMustNotContainNonUtf8 => "Topic Name Must Not Contain Non Utf 8",
Error::TopicNameMustNotContainWildcard => "Topic Name Must Not Contain Wildcard",
Error::MalformedRemainingLength => "Malformed Remaining Length",
Error::UnexpectedEof => "Unexpected Eof",
Error::Io(ref err) => err.description(),
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::Io(ref err) => Some(err),
_ => None,
}
}
}