Enum SessionStoreError 

pub enum SessionStoreError {
    Unavailable,
    DuplicateId,
}

Why a SessionStore operation could not be answered.

Not an Error for its own sake — it is one so a handler can ? it into the same failure path as everything else the adapter refuses, and so thiserror writes the text that reaches a log line.

Why no id appears in either message

Because Display output here is very likely to end up in a log, and the project does not log a full session id. Carrying the value inside the error would make the leak one careless tracing::error!("{err}") away, and the operator debugging a duplicate id wants to know that it happened far more than they want to know which id it was — the source is the thing to inspect.

Variants

Unavailable

A panic elsewhere unwound through the lock, so the map may be missing an insert it was midway through.

The store refuses rather than recovering, matching the idempotency store’s rule: answering from state this process cannot vouch for is how one request ends up served another request’s session.

DuplicateId

The injected IdSource returned an id that is already registered.

IdSource requires that an id is not reused while either session can still appear in the event log, so this means the source has wrapped or was seeded twice. Replacing the source is the fix; the store will not overwrite, because doing so silently transfers an established session to whoever asked next.

Trait Implementations

impl Clone for SessionStoreError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SessionStoreError

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 Eq for SessionStoreError

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.

impl PartialEq for SessionStoreError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SessionStoreError