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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::{fmt::Debug, mem};
use neqo_common::qtrace;
use crate::{
client_events::Http3ClientEvents,
settings::{HSettingType, HSettings},
};
pub mod extended_connect;
/// States:
/// - `Disable` - it is not turned on for this connection.
/// - `Negotiating` - the feature is enabled locally, but settings from the peer have not been
/// received yet.
/// - `Negotiated` - the settings have been received and both sides support the feature.
/// - `NegotiationFailed` - the settings have been received and the peer does not support the
/// feature.
#[derive(Debug)]
pub enum NegotiationState {
Disabled,
Negotiating {
feature_type: HSettingType,
listener: Option<Http3ClientEvents>,
},
Negotiated,
NegotiationFailed,
}
impl NegotiationState {
#[must_use]
pub const fn new(enable: bool, feature_type: HSettingType) -> Self {
if enable {
Self::Negotiating {
feature_type,
listener: None,
}
} else {
Self::Disabled
}
}
pub fn set_listener(&mut self, new_listener: Http3ClientEvents) {
if let Self::Negotiating { listener, .. } = self {
*listener = Some(new_listener);
}
}
pub fn handle_settings(&mut self, settings: &HSettings) {
if !self.locally_enabled() {
return;
}
if let Self::Negotiating {
feature_type,
listener,
} = self
{
qtrace!(
"set_negotiated {:?} to {}",
feature_type,
settings.get(*feature_type)
);
let cb = mem::take(listener);
let ft = *feature_type;
*self = if settings.get(ft) == 1 {
Self::Negotiated
} else {
Self::NegotiationFailed
};
if let Some(l) = cb {
l.negotiation_done(ft, self.enabled());
}
}
}
#[must_use]
pub const fn enabled(&self) -> bool {
matches!(self, &Self::Negotiated)
}
#[must_use]
pub const fn locally_enabled(&self) -> bool {
!matches!(self, &Self::Disabled)
}
}