Module singleflight 

In-process single-flight coordination.

For a given key, one caller becomes the leader and runs the future; all concurrent callers with the same key await the leader’s outcome. Leaders remove their entry when finished, so a new wave of callers starts fresh.

The type is generic over the outcome because the two call sites differ: load-flights share the leader’s Result<Certificate, Arc<Error>>, while obtain-flights only share completion (followers then re-check storage), so the latter uses SingleFlight<()> and re-runs its logic after waking.

Structs

SingleFlight

Coordinates single execution per key.

Enums

FlightOutcome

The result of participating in a flight.