Enum Error 

#[non_exhaustive]
pub enum Error {
    ConnectionClosed,
    Memcache(String),
    UnexpectedResponse,
    Protocol(ParseError),
    Io(Error),
    AllConnectionsFailed,
    NoPending,
    TooManyInFlight,
    KeyTooLong,
    ValueTooLong,
}

Errors returned by the ringline Memcache 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.

Memcache(String)

The server returned an error response (ERROR, CLIENT_ERROR, SERVER_ERROR).

UnexpectedResponse

The response type did not match the expected type for the command.

Protocol(ParseError)

Memcache protocol parse error.

Io(Error)

I/O error during send.

AllConnectionsFailed

All connections in the pool are down and reconnection failed.

NoPending

recv() called with no pending fire operations.

TooManyInFlight

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

KeyTooLong

Key exceeds memcache’s 250-byte cap (MAX_KEY_LEN). The request is rejected client-side instead of being transmitted; otherwise the server would reply with CLIENT_ERROR after consuming pool / pending-queue capacity for a doomed command.

ValueTooLong

Value exceeds memcache’s default -I 1 MiB cap (MAX_VALUE_LEN). Same rationale as Error::KeyTooLong.

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.

impl From<ParseError> for Error

fn from(source: ParseError) -> Self

Converts to this type from the input type.