Enum PendingReason 

#[non_exhaustive]
pub enum PendingReason {
    SeekPending,
    NotReady(NotReadyCause),
    VariantChange,
    Retry,
}

Reason a ReadOutcome::Pending was returned — i.e. why the source did not make progress this call. Each variant maps to a distinct caller action; there is no overlap and no string-matching required.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SeekPending

A seek is pending (consumer flagged the timeline). The caller must abort the current read and let the seek apply — do not retry from the same byte offset.

NotReady(NotReadyCause)

Data is not yet available at the requested range. Transient — caller may retry after backoff. The inner NotReadyCause tells which point in the read pipeline failed to make progress (wait budget exhausted, wait interrupted, source-side pending).

VariantChange

Source crossed a variant boundary at this offset. Caller must recreate the decoder and call Source::clear_variant_fence before reads succeed. Zero bytes were touched — the fence fires BEFORE any data is read.

Retry

Resource was evicted between Source::wait_range (metadata ready) and Source::read_at (actual I/O). Caller should retry from wait_range, not from the same byte offset.

Trait Implementations

impl Clone for PendingReason

fn clone(&self) -> PendingReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PendingReason

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

Formats the value using the given formatter.

impl Display for PendingReason

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

Formats the value using the given formatter.

impl Error for PendingReason

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl PartialEq for PendingReason

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PendingReason

impl Eq for PendingReason

impl StructuralPartialEq for PendingReason