Struct CompositeEpochRevocation 

pub struct CompositeEpochRevocation { /* private fields */ }

Composes a best-effort Cache and an authoritative Fetcher into the engine’s EpochRevocation port.

Promoted to the SDK in Phase 11.Z from chat-auth’s epoch_adapter::ChatAuthEpochRevocation (§3 Row 6 “replace, don’t layer”). All consumers wire this shape — only their Cache + Fetcher impl identities differ:

Consumer	Cache	Fetcher
chat-api	super::SharedCacheCache (sv:{sub})	Cross-schema SQL (scaccounts.ppnums)
RCW	super::SharedCacheCache (sv:{sub})	(Slice 3 deferred — RFC_2026-05-08 §4.4)
CTW	super::SharedCacheCache (sv:{sub})	(Slice 4 deferred — RFC_2026-05-08 §4.4)

Algorithm — preserved from chat-auth’s pre-promotion shape

1. cache.get(sv:{sub}) — hit short-circuits.
2. Miss → fetcher.fetch(sub) (authoritative read).
3. Fetcher Ok → cache.set(sv:{sub}, value, SV_CACHE_TTL) (best-effort write-back; failures swallowed per Cache::set contract).
4. Fetcher Err → EpochRevocationError::Transient (fail-closed).

The engine’s check_epoch::run then maps:

• Ok(c) and token.sv >= c → admit
• Ok(c) and token.sv < c → AuthError::SessionVersionStale
• Err(Transient) → AuthError::SessionVersionLookupUnavailable

The SDK then maps those to typed crate::TokenVerifyError::SessionVersionStale / crate::TokenVerifyError::SessionVersionLookupUnavailable.

Implementations

impl CompositeEpochRevocation

pub fn new(cache: Arc<dyn Cache>, fetcher: Arc<dyn Fetcher>) -> Self

Build from injected Cache + Fetcher impls. Both are Arc<dyn> so the same composer can be wrapped in Arc<dyn EpochRevocation> at the wiring site without further indirection.

Trait Implementations

impl Debug for CompositeEpochRevocation

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

Formats the value using the given formatter.

impl EpochRevocation for CompositeEpochRevocation

fn current<'life0, 'life1, 'async_trait>( &'life0 self, sub: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<i64, EpochRevocationError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,