Enum Error 

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

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.

LengthMismatch

A streaming set_stream value source produced a different number of bytes than the declared length. Because the command header (which declares the length) is already on the wire, the framing is now irrecoverably desynced, so the connection is closed — matching the read-side poison rule.

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.