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use std::error::Error as StdError;
use std::fmt;
use std::io::Error as IoError;
use std::str::Utf8Error;
use std::string::FromUtf8Error;
use httparse;
pub use uri::UriError;
use self::Error::{
Method,
Uri,
Version,
Header,
Status,
Timeout,
Io,
TooLarge,
Incomplete,
Utf8
};
pub type Result<T> = ::std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
Method,
Uri(UriError),
Version,
Header,
TooLarge,
Incomplete,
Status,
Timeout,
Io(IoError),
Utf8(Utf8Error),
#[doc(hidden)]
__Nonexhaustive(Void)
}
#[doc(hidden)]
pub struct Void(());
impl fmt::Debug for Void {
fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
unreachable!()
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Uri(ref e) => fmt::Display::fmt(e, f),
Io(ref e) => fmt::Display::fmt(e, f),
Utf8(ref e) => fmt::Display::fmt(e, f),
ref e => f.write_str(e.description()),
}
}
}
impl StdError for Error {
fn description(&self) -> &str {
match *self {
Method => "Invalid Method specified",
Version => "Invalid HTTP version specified",
Header => "Invalid Header provided",
TooLarge => "Message head is too large",
Status => "Invalid Status provided",
Incomplete => "Message is incomplete",
Timeout => "Timeout",
Uri(ref e) => e.description(),
Io(ref e) => e.description(),
Utf8(ref e) => e.description(),
Error::__Nonexhaustive(..) => unreachable!(),
}
}
fn cause(&self) -> Option<&StdError> {
match *self {
Io(ref error) => Some(error),
Uri(ref error) => Some(error),
Utf8(ref error) => Some(error),
Error::__Nonexhaustive(..) => unreachable!(),
_ => None,
}
}
}
impl From<UriError> for Error {
fn from(err: UriError) -> Error {
Uri(err)
}
}
impl From<IoError> for Error {
fn from(err: IoError) -> Error {
Io(err)
}
}
impl From<Utf8Error> for Error {
fn from(err: Utf8Error) -> Error {
Utf8(err)
}
}
impl From<FromUtf8Error> for Error {
fn from(err: FromUtf8Error) -> Error {
Utf8(err.utf8_error())
}
}
impl From<httparse::Error> for Error {
fn from(err: httparse::Error) -> Error {
match err {
httparse::Error::HeaderName |
httparse::Error::HeaderValue |
httparse::Error::NewLine |
httparse::Error::Token => Header,
httparse::Error::Status => Status,
httparse::Error::TooManyHeaders => TooLarge,
httparse::Error::Version => Version,
}
}
}
#[cfg(test)]
mod tests {
use std::error::Error as StdError;
use std::io;
use httparse;
use super::Error;
use super::Error::*;
#[test]
fn test_cause() {
let orig = io::Error::new(io::ErrorKind::Other, "other");
let desc = orig.description().to_owned();
let e = Io(orig);
assert_eq!(e.cause().unwrap().description(), desc);
}
macro_rules! from {
($from:expr => $error:pat) => {
match Error::from($from) {
e @ $error => {
assert!(e.description().len() >= 5);
} ,
e => panic!("{:?}", e)
}
}
}
macro_rules! from_and_cause {
($from:expr => $error:pat) => {
match Error::from($from) {
e @ $error => {
let desc = e.cause().unwrap().description();
assert_eq!(desc, $from.description().to_owned());
assert_eq!(desc, e.description());
},
_ => panic!("{:?}", $from)
}
}
}
#[test]
fn test_from() {
from_and_cause!(io::Error::new(io::ErrorKind::Other, "other") => Io(..));
from!(httparse::Error::HeaderName => Header);
from!(httparse::Error::HeaderName => Header);
from!(httparse::Error::HeaderValue => Header);
from!(httparse::Error::NewLine => Header);
from!(httparse::Error::Status => Status);
from!(httparse::Error::Token => Header);
from!(httparse::Error::TooManyHeaders => TooLarge);
from!(httparse::Error::Version => Version);
}
}