Enum DraftSource 

enum DraftSource {
    Fallback,
    Offered,
    Selected,
    Alpn,
}

Where a session’s draft came from, ranked by how much it is worth.

A later answer replaces an earlier one only if it outranks it, which is what makes the order here the whole policy and keeps it in one place.

Variants

Fallback

Nobody named a draft, so the session kept the one it was configured for. Two things produce it: DRAFT_SETTLE_WINDOW expiring, and a control stream whose first message is readable enough to say it is not a SETUP — in both cases there is nothing to learn from and the tasks waiting on an answer are better off with the starting draft than with the wait.

The lowest rank, because it is not an answer at all: it is the absence of one, and a SETUP that turns up afterwards — on this direction or the other — must still be able to replace it.

Offered

The highest draft in the moq-00 cohort that CLIENT_SETUP offered. An offer rather than an agreement: a server is free to select a lower version out of the same list.

Selected

The version SERVER_SETUP selected. This is the one the two peers are actually speaking, so it outranks the client’s offer.

Alpn

The ALPN, which names exactly one draft from 15 on and is known before a byte is read. Nothing can improve on it, so it outranks everything and the session never waits.

Trait Implementations

impl Clone for DraftSource

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DraftSource

impl Debug for DraftSource

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for DraftSource

impl Ord for DraftSource

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for DraftSource

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for DraftSource

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for DraftSource