Enum Error 

#[non_exhaustive]
pub enum Error {
    ConnectionClosed,
    NotAuthenticated,
    AuthFailed(String),
    Protocol(String),
    Config(String),
    Io(Error),
    NoPending,
    AllConnectionsFailed,
    TooManyInFlight,
    PendingOpsInFlight,
}

Errors that can occur when using the Momento client.

Marked #[non_exhaustive] because the crate is still evolving and new transport / protocol error kinds are expected. Downstream match blocks must include a wildcard arm.

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.

ConnectionClosed

The connection was closed before a response was received.

NotAuthenticated

Not authenticated (auth command not yet completed).

AuthFailed(String)

Authentication with Momento failed.

Protocol(String)

Protocol-level error (malformed response, unexpected message type).

Config(String)

Configuration error (bad token, missing env var).

Io(Error)

I/O error during send or recv.

NoPending

recv() was called with no in-flight requests.

AllConnectionsFailed

All connections in the pool are down and reconnection failed.

TooManyInFlight

The in-flight pending-op map reached max_in_flight. Drain via recv() before issuing more fire_* calls. Configurable via crate::ClientBuilder::max_in_flight.

PendingOpsInFlight

A sequential API call (crate::Client::get / set / delete) was issued while one or more fire_* ops were still in flight. Momento is multiplexed and recv() returns whatever message_id arrives first; the convenience APIs discard the id/key and would silently return data for the wrong request. Drain recv() until pending_count() == 0 before calling the sequential API, or use fire_* + recv() exclusively.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.