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ServiceActivator

zlayer_agent::proxy_manager

Struct ServiceActivator 

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pub struct ServiceActivator { /* private fields */ }
Expand description

On-demand Activator for scale-to-zero services.

When the proxy resolves a route with no healthy backend, it calls Activator::activate with the resolved LB group key. This implementation derives the bare service name from that key, triggers a scale-up to the activation floor via a ScaleTrigger, then polls the shared LoadBalancer until a healthy backend for the key appears (or the deadline elapses).

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impl ServiceActivator

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pub fn new( trigger: Arc<dyn ScaleTrigger>, load_balancer: Arc<LoadBalancer>, ) -> Self

Create an activator that scales up via trigger and waits on load_balancer for readiness, using [DEFAULT_ACTIVATION_FLOOR].

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pub fn with_floor(self, floor: u32) -> Self

Override the activation replica floor (default [DEFAULT_ACTIVATION_FLOOR]). A floor of 0 is clamped to 1 so an activation always brings the service up.

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impl Activator for ServiceActivator

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fn activate<'life0, 'life1, 'async_trait>( &'life0 self, service: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<(), String>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Trigger activation (scale-up) for the load-balancer group service. Read more

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