Enum DecodeError 

pub enum DecodeError {
    MissingQuarterStreamId,
    QuarterStreamIdTooLarge(u64),
    MissingContextId,
}

Why a datagram could not be decoded.

The three cases are kept apart because RFC 9297 §2.1 treats them differently: the two that are about the Quarter Stream ID field are connection errors, while a Context ID that does not parse is not covered by any such rule.

Variants

MissingQuarterStreamId

The payload was too short to hold a Quarter Stream ID.

QuarterStreamIdTooLarge(u64)

The Quarter Stream ID is larger than MAX_QUARTER_STREAM_ID.

MissingContextId

The Quarter Stream ID parsed, but the Context ID varint did not.

Implementations

impl DecodeError

pub fn is_connection_error(self) -> bool

Whether RFC 9297 §2.1 requires the whole connection to be closed.

Two MUSTs, both about the Quarter Stream ID field: a datagram carrying a value above 2^60-1, and one “whose payload is too short to allow parsing the Quarter Stream ID field”, must each “be treated as an HTTP/3 connection error of type H3_DATAGRAM_ERROR (0x33)”. Both are quoted verbatim, with their machine-readable anchors, where they are acted on – h3::connection::route_datagram – and this is the pointer to them rather than a second copy (D79).

A truncated Context ID is deliberately not one of them. Nothing in RFC 9298 §5 says what to do with it, so dropping the datagram is legitimate, and escalating a droppable condition into a connection error would hand the peer a way to kill every session at once.

Trait Implementations

impl Clone for DecodeError

fn clone(&self) -> DecodeError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DecodeError

impl Debug for DecodeError

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

Formats the value using the given formatter.

impl Display for DecodeError

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

Formats the value using the given formatter.

impl Eq for DecodeError

impl Error for DecodeError

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 DecodeError

fn eq(&self, other: &DecodeError) -> 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 StructuralPartialEq for DecodeError