Module layer 

Layer type and utilities.

Layers are the abstraction of middleware in Rama.

Direct copy of tower-layer.

Modules

abort

Middleware that allows a user to cancel an operation using a controller.

add_extension

Middleware that clones a value into an incoming input’s or an output’s extensions

get_extension

Middleware that gets called with a clone of the value of to given type if it is available in the current input/output extensions.

limit

A middleware that limits the number of in-flight inputs.

timeout

Middleware that applies a timeout to inputs.

Structs

Abortable

Applies the option to abort an inner service.

AbortableLayer

Applies the option to abort an inner service.

AddInputExtension

Middleware for adding some shareable value to incoming input’s extensions.

AddInputExtensionLayer

Layer for adding some shareable value to incoming input’s extensions.

AddOutputExtension

Middleware for adding some shareable value to an output’s extensions.

AddOutputExtensionLayer

Layer for adding some shareable value to an output’s extensions.

ConsumeErr

Consumes this service’s error value and returns Infallible.

ConsumeErrLayer

A Layer that produces ConsumeErr services.

GetInputExtension

Middleware for retrieving shareable value from input extensions.

GetInputExtensionLayer

Layer for retrieving some shareable value from input extensions.

GetOutputExtension

Middleware for retrieving shareable value from output extensions.

GetOutputExtensionLayer

Layer for retrieving some shareable value from output extensions.

HijackLayer

Middleware to hijack an inputs to a Service which match using a Matcher.

HijackService

Middleware to hijack inputs 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 inputs based on a Policy.

LimitLayer

Limit inputs based on a Policy.

MapErr

Maps this service’s error value to a different value.

MapErrLayer

A Layer that produces MapErr services.

MapInput

Composes a function in front of the service.

MapInputLayer

A Layer that produces MapInput services.

MapOutput

Maps this service’s output value to a different value.

MapOutputLayer

A Layer that produces a MapOutput 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.

MaybeLayeredService

MaybeLayeredService is Service which is created by using an Option<Layer>

Timeout

Applies a timeout to inputs.

TimeoutLayer

Applies a timeout to inputs 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.