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EnvelopeLayer

cratestack::envelope_layer

Struct EnvelopeLayer 

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

Opens signed requests and seals responses for a generated router; see the module docs for placement and guarantees. Build it with EnvelopeLayer::builder, or with the generated cratestack_schema::axum::envelope_layer. Cheap to clone.

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impl EnvelopeLayer

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pub fn builder( envelope: impl ServerEnvelope, audience: impl Into<String>, contracts: &'static [(&'static str, &'static [[u8; 32]])], ) -> EnvelopeLayerBuilder

Start a layer for envelope (a cratestack_cose::CoseEnvelope built with CoseEnvelope::server, or your own ServerEnvelope).

  • audience: this service’s configured logical id, which every binding carries. Not the Host header, and distinct from the audience this service seals its own outbound requests for.
  • contracts: the generated cratestack_schema::ACCEPTED_CONTRACTS, per op, the op-contract digests a request may bind (binding version 2, cratestack#1123). Which one a request used is told by its Cratestack-Contract header (see EnvelopeLayerBuilder::max_contract_trials). The table is &'static: a deployer who loads history at runtime has to Box::leak it, which the generated table (PR 3’s lock) never needs; accepting a Cow/Arc is a later, compatible change.

Then name the transport (EnvelopeLayerBuilder::rest, EnvelopeLayerBuilder::rpc or a custom EnvelopeLayerBuilder::binding_resolver) and the EnvelopeLayerBuilder::policy; neither has a default. The generated envelope_layer(envelope, policy, audience) does both for the schema’s own transport.

Trait Implementations§

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impl Clone for EnvelopeLayer

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fn clone(&self) -> EnvelopeLayer

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

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

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

Formats the value using the given formatter. Read more
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impl<S> Layer<S> for EnvelopeLayer

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type Service = EnvelopeService<S>

The wrapped service
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fn layer(&self, inner: S) -> <EnvelopeLayer as Layer<S>>::Service

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

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