Enum SessionLivenessError 

#[non_exhaustive]
pub enum SessionLivenessError {
    Revoked,
    Transient(String),
}

Per-request liveness failure surface.

Two variants — Revoked (substrate said “no”) and Transient (substrate couldn’t answer) — collapse to typed crate::VerifyError variants in the verifier so audit logs pivot L2-revoked vs L2-substrate-down distinct from L1 sv-axis events.

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.

Revoked

Session row absent OR revoked_at is set. Token rejected as crate::VerifyError::SessionRevoked. The two surface causes (absent row vs revoked row) collapse to one variant because audit-time distinction is rarely actionable: a user whose row was deleted is in the same security state as one whose row was flipped to revoked. Substrate-side logging records the cause if needed.

Transient(String)

Substrate could not answer (connection error, query timeout, schema unavailable). Carries a free-form detail for audit logs; the verifier collapses every Transient variant onto crate::VerifyError::SessionLivenessLookupUnavailable (fail-closed) so the engine sees a uniform contract regardless of substrate flavor.

Trait Implementations

impl Debug for SessionLivenessError

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

Formats the value using the given formatter.

impl Display for SessionLivenessError

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

Formats the value using the given formatter.

impl Error for SessionLivenessError

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.