Enum SessionStoreError 

pub enum SessionStoreError {
    Backend(String),
}

Error returned by a SessionStore when the backing store could not satisfy a request. Distributed backends (e.g. Valkey) surface connectivity/timeout/protocol failures and undecodable responses here so callers can fail closed rather than silently treating a backend failure as “no accumulated labels”.

String-typed deliberately, matching the trait’s own philosophy (see the module header): the error stays free of backend-specific types so non-CMF bridges and the cross-crate cpex-session-valkey backend can construct it without dragging dependencies into this surface.

Note the distinction this enables: a positively-confirmed key-miss (unknown session) is Ok(empty), NOT an error — only a genuine backend failure is an Err.

Variants

Backend(String)

The backing store was unreachable, timed out, returned an error, or returned a response that could not be decoded into the expected representation. Callers fail closed on this.

Trait Implementations

impl Debug for SessionStoreError

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

Formats the value using the given formatter.

impl Display for SessionStoreError

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

Formats the value using the given formatter.

impl Error for SessionStoreError

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.