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#[derive(Debug)]
pub struct InvalidQos(u8);
impl core::fmt::Display for InvalidQos {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "invalid QoS value: '{}'", self.0)
}
}
impl core::error::Error for InvalidQos {}
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Qos {
#[default]
AtMostOnce,
AtLeastOnce,
ExactlyOnce,
}
impl core::fmt::Display for Qos {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.write_str(match self {
Qos::AtMostOnce => "QoS::AtMostOnce",
Qos::AtLeastOnce => "Qos::AtLeastOnce",
Qos::ExactlyOnce => "Qos::ExactlyOnce",
})
}
}
impl Qos {
pub fn to_u8(&self) -> u8 {
match self {
Qos::AtMostOnce => 0,
Qos::AtLeastOnce => 1,
Qos::ExactlyOnce => 2,
}
}
pub fn from_u8(v: u8) -> Option<Self> {
match v {
0 => Some(Self::AtMostOnce),
1 => Some(Self::AtLeastOnce),
2 => Some(Self::ExactlyOnce),
_ => None,
}
}
}
impl TryFrom<u8> for Qos {
type Error = InvalidQos;
fn try_from(value: u8) -> Result<Self, Self::Error> {
match Self::from_u8(value) {
Some(v) => Ok(v),
None => Err(InvalidQos(value)),
}
}
}
impl From<Qos> for u8 {
fn from(value: Qos) -> Self {
value.to_u8()
}
}
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