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use std::fmt;
use std::time::Duration;
use header::{Header, Raw};
use header::shared::HttpDate;
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum RetryAfter {
Delay(Duration),
DateTime(HttpDate),
}
impl Header for RetryAfter {
fn header_name() -> &'static str {
static NAME: &'static str = "Retry-After";
NAME
}
fn parse_header(raw: &Raw) -> ::Result<RetryAfter> {
if let Some(ref line) = raw.one() {
let utf8_str = match ::std::str::from_utf8(line) {
Ok(utf8_str) => utf8_str,
Err(_) => return Err(::Error::Header),
};
if let Ok(datetime) = utf8_str.parse::<HttpDate>() {
return Ok(RetryAfter::DateTime(datetime))
}
if let Ok(seconds) = utf8_str.parse::<u64>() {
return Ok(RetryAfter::Delay(Duration::from_secs(seconds)));
}
Err(::Error::Header)
} else {
Err(::Error::Header)
}
}
fn fmt_header(&self, f: &mut ::header::Formatter) -> ::std::fmt::Result {
f.fmt_line(self)
}
}
impl fmt::Display for RetryAfter {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
RetryAfter::Delay(ref duration) => {
write!(f, "{}", duration.as_secs())
},
RetryAfter::DateTime(ref datetime) => {
fmt::Display::fmt(datetime, f)
}
}
}
}
#[cfg(test)]
mod tests {
use std::time::Duration;
use header::Header;
use header::shared::HttpDate;
use super::RetryAfter;
#[test]
fn header_name_regression() {
assert_eq!(RetryAfter::header_name(), "Retry-After");
}
#[test]
fn parse_delay() {
let retry_after = RetryAfter::parse_header(&vec![b"1234".to_vec()].into()).unwrap();
assert_eq!(RetryAfter::Delay(Duration::from_secs(1234)), retry_after);
}
macro_rules! test_retry_after_datetime {
($name:ident, $bytes:expr) => {
#[test]
fn $name() {
let dt = "Sun, 06 Nov 1994 08:49:37 GMT".parse::<HttpDate>().unwrap();
let retry_after = RetryAfter::parse_header(&vec![$bytes.to_vec()].into()).expect("parse_header ok");
assert_eq!(RetryAfter::DateTime(dt), retry_after);
}
}
}
test_retry_after_datetime!(header_parse_rfc1123, b"Sun, 06 Nov 1994 08:49:37 GMT");
test_retry_after_datetime!(header_parse_rfc850, b"Sunday, 06-Nov-94 08:49:37 GMT");
test_retry_after_datetime!(header_parse_asctime, b"Sun Nov 6 08:49:37 1994");
#[test]
fn hyper_headers_from_raw_delay() {
let retry_after = RetryAfter::parse_header(&b"300".to_vec().into()).unwrap();
assert_eq!(retry_after, RetryAfter::Delay(Duration::from_secs(300)));
}
#[test]
fn hyper_headers_from_raw_datetime() {
let retry_after = RetryAfter::parse_header(&b"Sun, 06 Nov 1994 08:49:37 GMT".to_vec().into()).unwrap();
let expected = "Sun, 06 Nov 1994 08:49:37 GMT".parse::<HttpDate>().unwrap();
assert_eq!(retry_after, RetryAfter::DateTime(expected));
}
}