alloy_transport::layers

Struct FallbackLayer

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

Fallback layer for transparent transport failover. This layer will consume a list of transports to provide better availability and reliability.

The FallbackService will attempt to make requests to multiple transports in parallel, and return the first successful response.

If all transports fail, the fallback service will return an error.

§Automatic Transport Ranking

Each transport is automatically ranked based on latency & stability using a weighted algorithm. By default:

  • Stability (success rate) is weighted at 70%
  • Latency (response time) is weighted at 30%
  • The active_transport_count parameter controls how many transports are queried at any one time.

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impl FallbackLayer

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pub const fn with_active_transport_count(self, count: NonZeroUsize) -> Self

Set the number of active transports to use (must be greater than 0)

Trait Implementations§

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impl Clone for FallbackLayer

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fn clone(&self) -> FallbackLayer

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for FallbackLayer

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

Formats the value using the given formatter. Read more
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impl Default for FallbackLayer

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<S> Layer<Vec<S>> for FallbackLayer
where S: Service<RequestPacket, Future = TransportFut<'static>, Error = TransportError> + Send + Clone + 'static,

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type Service = FallbackService<S>

The wrapped service
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fn layer(&self, inner: Vec<S>) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.

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