Enum CancelError 

pub(crate) enum CancelError {
    RequestNotFound,
    CannotCancelRequest,
    AlreadyCancelled,
}

An error given when we attempt to cancel an RPC request, but cannot.

Variants

RequestNotFound

We didn’t find any request with the provided ID.

Since we don’t keep track of requests after they finish or are cancelled, we cannot distinguish the cases where a request has finished, where the request has been cancelled, or where the request never existed. Therefore we collapse them into a single error type.

CannotCancelRequest

This kind of request cannot be cancelled.

AlreadyCancelled

We tried to cancel a request but found out it was already cancelled.

This error should be impossible.

Trait Implementations

impl Clone for CancelError

fn clone(&self) -> CancelError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CancelError

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

Formats the value using the given formatter.

impl Display for CancelError

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

Formats the value using the given formatter.

impl Error for CancelError

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 From<CancelError> for RpcError

fn from(err: CancelError) -> Self

Converts to this type from the input type.

impl From<CannotCancel> for CancelError

fn from(value: CannotCancel) -> Self

Converts to this type from the input type.

impl Serialize for CancelError

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.