Struct TrackStatusStateMachine 

pub struct TrackStatusStateMachine {
    state: TrackStatusState,
}

Pure state machine for a MoQT track status request. Transitions: Idle -> Pending -> Done.

Fields

state: TrackStatusState

Implementations

impl TrackStatusStateMachine

pub fn on_track_status_received(&mut self) -> Result<(), TrackStatusError>

Idle -> Pending (TRACK_STATUS received from the peer).

pub fn on_track_status_ok_sent(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_OK written on the peer’s stream).

pub fn on_track_status_error_sent(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_ERROR written on the peer’s stream).

impl TrackStatusStateMachine

pub fn new() -> Self

Creates a new state machine in the TrackStatusState::Idle state.

pub fn state(&self) -> TrackStatusState

Returns the current state of the track status request.

pub fn on_track_status_sent(&mut self) -> Result<(), TrackStatusError>

Idle -> Pending (TRACK_STATUS sent).

pub fn on_track_status_ok(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_OK received).

pub fn on_track_status_error(&mut self) -> Result<(), TrackStatusError>

Pending -> Done (REQUEST_ERROR received).

pub fn on_request_cancelled(&mut self) -> Result<(), TrackStatusError>

Pending -> Done, Done -> Done (this request’s stream was cancelled).

A track status request owns a stream like any other — “A potential subscriber sends TRACK_STATUS as the first and only message on a new bidi stream” — and it is the one request kind no draft ever gave a withdrawal message of its own. Section 3.3.1: “Once a request stream has been opened, the request MAY be cancelled by either endpoint.”

Idle is refused, on the other half of the same sentence: nothing has been written, so there is no stream to terminate. Done stays Done — nothing finishes a request stream’s send half on the ordinary path, so a caller that walks away from a request that has already ended still resets the stream, and that reset is an ordinary end rather than a fault.

Trait Implementations

impl Default for TrackStatusStateMachine

fn default() -> Self

Returns the “default value” for a type.