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85 lines
2.2 KiB
85 lines
2.2 KiB
8 years ago
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//! Error handling.
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use std::borrow::{Borrow, Cow};
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use std::error::Error as ErrorTrait;
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use std::fmt;
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use std::io;
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use std::result;
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use std::str;
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use std::string;
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use httparse;
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pub type Result<T> = result::Result<T, Error>;
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/// Possible WebSocket errors
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#[derive(Debug)]
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pub enum Error {
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/// Input-output error
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Io(io::Error),
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/// Buffer capacity exhausted
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Capacity(Cow<'static, str>),
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/// Protocol violation
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Protocol(Cow<'static, str>),
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/// UTF coding error
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Utf8(str::Utf8Error),
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/// Invlid URL.
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Url(Cow<'static, str>),
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/// HTTP error.
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Http(u16),
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Error::Io(ref err) => write!(f, "IO error: {}", err),
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Error::Capacity(ref msg) => write!(f, "Space limit exceeded: {}", msg),
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Error::Protocol(ref msg) => write!(f, "WebSocket protocol error: {}", msg),
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Error::Utf8(ref err) => write!(f, "UTF-8 encoding error: {}", err),
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Error::Url(ref msg) => write!(f, "URL error: {}", msg),
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Error::Http(code) => write!(f, "HTTP code: {}", code),
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}
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}
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}
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impl ErrorTrait for Error {
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fn description(&self) -> &str {
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match *self {
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Error::Io(ref err) => err.description(),
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Error::Capacity(ref msg) => msg.borrow(),
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Error::Protocol(ref msg) => msg.borrow(),
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Error::Utf8(ref err) => err.description(),
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Error::Url(ref msg) => msg.borrow(),
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Error::Http(_) => "",
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}
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}
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}
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impl From<io::Error> for Error {
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fn from(err: io::Error) -> Self {
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Error::Io(err)
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}
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}
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impl From<str::Utf8Error> for Error {
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fn from(err: str::Utf8Error) -> Self {
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Error::Utf8(err)
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}
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}
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impl From<string::FromUtf8Error> for Error {
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fn from(err: string::FromUtf8Error) -> Self {
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Error::Utf8(err.utf8_error())
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}
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}
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impl From<httparse::Error> for Error {
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fn from(err: httparse::Error) -> Self {
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match err {
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httparse::Error::TooManyHeaders => Error::Capacity("Too many headers".into()),
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e => Error::Protocol(Cow::Owned(e.description().into())),
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}
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}
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}
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