Trait gotham::middleware::NewMiddleware

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pub trait NewMiddleware: Sync + RefUnwindSafe {
    type Instance: Middleware;
    fn new_middleware(&self) -> Result<Self::Instance>;
}

Expand description

A type which is used to spawn new Middleware values. When implementing a Middleware, this defines how instances of the Middleware are created.

This can be derived by Middleware that implement Clone, and will result in the following implementation:

struct MyMiddleware;

impl NewMiddleware for MyMiddleware {
    type Instance = Self;

    fn new_middleware(&self) -> anyhow::Result<Self::Instance> {
        Ok(self.clone())
    }
}

Associated Types

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type Instance: Middleware

The type of Middleware created by the NewMiddleware.

Required methods

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fn new_middleware(&self) -> Result<Self::Instance>

Create and return a new Middleware value.

Implementors

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impl NewMiddleware for CookieParser

NewMiddleware trait implementation.

type Instance = Self

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impl NewMiddleware for RequestLogger

Implementation of NewMiddleware is required for Gotham middleware.

This will simply dereference the internal state, rather than deriving NewMiddleware which will clone the structure - should be cheaper for repeated calls.

type Instance = Self

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impl NewMiddleware for SimpleLogger

Implementation of NewMiddleware is required for Gotham middleware.

This will simply dereference the internal state, rather than deriving NewMiddleware which will clone the structure - should be cheaper for repeated calls.