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.