Module layer

Layer type and utilities.

Layers are the abstraction of middleware in Rama.

Direct copy of tower-layer.

Modules

• add_extension
  Middleware that clones a value into the incoming Context.
• get_extension
  Middleware that gets called with a clone of the value of to given type if it is available in the current Context.
• limit
  A middleware that limits the number of in-flight requests.
• timeout
  Middleware that applies a timeout to requests.

Structs

• AddExtension
  Middleware for adding some shareable value to incoming Context.
• AddExtensionLayer
  Layer for adding some shareable value to incoming Context.
• ConsumeErr
  Consumes this service’s error value and returns Infallible.
• ConsumeErrLayer
  A Layer that produces ConsumeErr services.
• GetExtension
  Middleware for adding some shareable value to incoming Context.
• GetExtensionLayer
  Layer for adding some shareable value to incoming Context.
• HijackLayer
  Middleware to hijack request to a Service which match using a Matcher.
• HijackService
  Middleware to hijack request to a Service which match using a Matcher.
• LayerErrorFn
  A MakeLayerError implementation that returns a new error value every time.
• LayerErrorStatic
  A MakeLayerError implementation that always returns clone of the same error value.
• LayerFn
  A Layer implemented by a closure. See the docs for layer_fn for more details.
• Limit
  Limit requests based on a Policy.
• LimitLayer
  Limit requests based on a Policy.
• MapErr
  Maps this service’s error value to a different value.
• MapErrLayer
  A Layer that produces MapErr services.
• MapRequest
  Composes a function in front of the service.
• MapRequestLayer
  A Layer that produces MapRequest services.
• MapResponse
  Maps this service’s response value to a different value.
• MapResponseLayer
  A Layer that produces a MapResponse service.
• MapResult
  Maps this service’s result type (Result<Self::Response, Self::Error>) to a different value, regardless of whether the future succeeds or fails.
• MapResultLayer
  A Layer that produces a MapResult service.
• MapState
  Middleware that can be used to map the state, and pass it as the new state for the inner service.
• MapStateLayer
  Middleware that can be used to map the state, and pass it as the new state for the inner service.
• Timeout
  Applies a timeout to requests.
• TimeoutLayer
  Applies a timeout to requests via the supplied inner service.
• TraceErr
  Service which traces the error using [tracing], of the inner Service.
• TraceErrLayer
  A Layer that produces TraceErr services.

Traits

• Layer
  A layer that produces a Layered service (middleware(inner service)).
• MakeLayerError
  Utility error trait to allow Rama layers to return a default error as well as a user-defined one, being it a Clone-able type or a Fn returning an error type.

Functions

• layer_fn
  Returns a new LayerFn that implements Layer by calling the given function.