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/// Possible downstream states during request multiplexing
#[derive(Debug, Clone, Copy)]
pub(crate) enum DownstreamStateMachine {
/// more request (body) to read
Reading,
/// no more data to read
ReadingFinished,
/// downstream is already errored or closed
Errored,
}
#[allow(clippy::wrong_self_convention)]
impl DownstreamStateMachine {
pub fn new(finished: bool) -> Self {
if finished {
Self::ReadingFinished
} else {
Self::Reading
}
}
// Can call read() to read more data or wait on closing
pub fn can_poll(&self) -> bool {
!matches!(self, Self::Errored)
}
pub fn is_reading(&self) -> bool {
matches!(self, Self::Reading)
}
pub fn is_done(&self) -> bool {
!matches!(self, Self::Reading)
}
pub fn is_errored(&self) -> bool {
matches!(self, Self::Errored)
}
/// Move the state machine to Finished state if `set` is true
pub fn maybe_finished(&mut self, set: bool) {
if set {
*self = Self::ReadingFinished
}
}
pub fn to_errored(&mut self) {
*self = Self::Errored
}
}
/// Possible upstream states during request multiplexing
#[derive(Debug, Clone, Copy)]
pub(crate) struct ResponseStateMachine {
upstream_response_done: bool,
cached_response_done: bool,
}
impl ResponseStateMachine {
pub fn new() -> Self {
ResponseStateMachine {
upstream_response_done: false,
cached_response_done: true, // no cached response by default
}
}
pub fn is_done(&self) -> bool {
self.upstream_response_done && self.cached_response_done
}
pub fn upstream_done(&self) -> bool {
self.upstream_response_done
}
pub fn cached_done(&self) -> bool {
self.cached_response_done
}
pub fn enable_cached_response(&mut self) {
self.cached_response_done = false;
}
pub fn maybe_set_upstream_done(&mut self, done: bool) {
if done {
self.upstream_response_done = true;
}
}
pub fn maybe_set_cache_done(&mut self, done: bool) {
if done {
self.cached_response_done = true;
}
}
}
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