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use std::error;
use std::fmt;
use std::result;
use header;
use method;
use status;
use uri;
pub struct Error {
inner: ErrorKind,
}
pub type Result<T> = result::Result<T, Error>;
enum ErrorKind {
StatusCode(status::InvalidStatusCode),
Method(method::InvalidMethod),
Uri(uri::InvalidUri),
UriShared(uri::InvalidUriBytes),
UriParts(uri::InvalidUriParts),
HeaderName(header::InvalidHeaderName),
HeaderNameShared(header::InvalidHeaderNameBytes),
HeaderValue(header::InvalidHeaderValue),
HeaderValueShared(header::InvalidHeaderValueBytes),
}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("http::Error")
.field(&self.get_ref())
.finish()
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self.get_ref(), f)
}
}
impl Error {
pub fn is<T: error::Error + 'static>(&self) -> bool {
self.get_ref().is::<T>()
}
#[allow(warnings)]
pub fn get_ref(&self) -> &(error::Error + 'static) {
use self::ErrorKind::*;
match self.inner {
StatusCode(ref e) => e,
Method(ref e) => e,
Uri(ref e) => e,
UriShared(ref e) => e,
UriParts(ref e) => e,
HeaderName(ref e) => e,
HeaderNameShared(ref e) => e,
HeaderValue(ref e) => e,
HeaderValueShared(ref e) => e,
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
use self::ErrorKind::*;
match self.inner {
StatusCode(ref e) => e.description(),
Method(ref e) => e.description(),
Uri(ref e) => e.description(),
UriShared(ref e) => e.description(),
UriParts(ref e) => e.description(),
HeaderName(ref e) => e.description(),
HeaderNameShared(ref e) => e.description(),
HeaderValue(ref e) => e.description(),
HeaderValueShared(ref e) => e.description(),
}
}
#[allow(warnings)]
fn cause(&self) -> Option<&error::Error> {
self.get_ref().cause()
}
}
impl From<status::InvalidStatusCode> for Error {
fn from(err: status::InvalidStatusCode) -> Error {
Error { inner: ErrorKind::StatusCode(err) }
}
}
impl From<method::InvalidMethod> for Error {
fn from(err: method::InvalidMethod) -> Error {
Error { inner: ErrorKind::Method(err) }
}
}
impl From<uri::InvalidUri> for Error {
fn from(err: uri::InvalidUri) -> Error {
Error { inner: ErrorKind::Uri(err) }
}
}
impl From<uri::InvalidUriBytes> for Error {
fn from(err: uri::InvalidUriBytes) -> Error {
Error { inner: ErrorKind::UriShared(err) }
}
}
impl From<uri::InvalidUriParts> for Error {
fn from(err: uri::InvalidUriParts) -> Error {
Error { inner: ErrorKind::UriParts(err) }
}
}
impl From<header::InvalidHeaderName> for Error {
fn from(err: header::InvalidHeaderName) -> Error {
Error { inner: ErrorKind::HeaderName(err) }
}
}
impl From<header::InvalidHeaderNameBytes> for Error {
fn from(err: header::InvalidHeaderNameBytes) -> Error {
Error { inner: ErrorKind::HeaderNameShared(err) }
}
}
impl From<header::InvalidHeaderValue> for Error {
fn from(err: header::InvalidHeaderValue) -> Error {
Error { inner: ErrorKind::HeaderValue(err) }
}
}
impl From<header::InvalidHeaderValueBytes> for Error {
fn from(err: header::InvalidHeaderValueBytes) -> Error {
Error { inner: ErrorKind::HeaderValueShared(err) }
}
}
pub enum Never {}
impl From<Never> for Error {
fn from(never: Never) -> Error {
match never {}
}
}
impl fmt::Debug for Never {
fn fmt(&self, _f: &mut fmt::Formatter) -> fmt::Result {
match *self {}
}
}
impl fmt::Display for Never {
fn fmt(&self, _f: &mut fmt::Formatter) -> fmt::Result {
match *self {}
}
}
impl error::Error for Never {
fn description(&self) -> &str {
match *self {}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn inner_error_is_invalid_status_code() {
if let Err(e) = status::StatusCode::from_u16(6666) {
let err: Error = e.into();
let ie = err.get_ref();
assert!(!ie.is::<header::InvalidHeaderValue>());
assert!( ie.is::<status::InvalidStatusCode>());
ie.downcast_ref::<status::InvalidStatusCode>().unwrap();
assert!(!err.is::<header::InvalidHeaderValue>());
assert!( err.is::<status::InvalidStatusCode>());
} else {
panic!("Bad status allowed!");
}
}
}