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use serde::{de::Error, de::Visitor, Deserialize, Deserializer, Serialize, Serializer};
#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
#[non_exhaustive]
pub enum Version {
Http0_9,
Http1_0,
Http1_1,
Http2_0,
Http3_0,
}
impl Serialize for Version {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(&self.to_string())
}
}
struct VersionVisitor;
impl<'de> Visitor<'de> for VersionVisitor {
type Value = Version;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(formatter, "a HTTP version as &str")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
match v {
"HTTP/0.9" => Ok(Version::Http0_9),
"HTTP/1.0" => Ok(Version::Http1_0),
"HTTP/1.1" => Ok(Version::Http1_1),
"HTTP/2" => Ok(Version::Http2_0),
"HTTP/3" => Ok(Version::Http3_0),
_ => Err(Error::invalid_value(serde::de::Unexpected::Str(v), &self)),
}
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
where
E: Error,
{
self.visit_str(&v)
}
}
impl<'de> Deserialize<'de> for Version {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(VersionVisitor)
}
}
impl std::fmt::Display for Version {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str(match self {
Version::Http0_9 => "HTTP/0.9",
Version::Http1_0 => "HTTP/1.0",
Version::Http1_1 => "HTTP/1.1",
Version::Http2_0 => "HTTP/2",
Version::Http3_0 => "HTTP/3",
})
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn to_string() {
let output = format!(
"{} {} {} {} {}",
Version::Http0_9,
Version::Http1_0,
Version::Http1_1,
Version::Http2_0,
Version::Http3_0
);
assert_eq!("HTTP/0.9 HTTP/1.0 HTTP/1.1 HTTP/2 HTTP/3", output);
}
#[test]
fn ord() {
use Version::*;
assert!(Http3_0 > Http2_0);
assert!(Http2_0 > Http1_1);
assert!(Http1_1 > Http1_0);
assert!(Http1_0 > Http0_9);
}
#[test]
fn serde() -> Result<(), serde_json::Error> {
assert_eq!("\"HTTP/3\"", serde_json::to_string(&Version::Http3_0)?);
assert_eq!(Version::Http1_1, serde_json::from_str("\"HTTP/1.1\"")?);
Ok(())
}
}