Trait Middleware 

pub trait Middleware<Input, Output, State>: Send + Sync
where
    Input: Send + Clone + 'static,
    Output: Send + 'static,
    State: Send + Sync + 'static,
{
    // Required method
    fn name(&self) -> &str;

    // Provided methods
    fn before_handle<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _input: &'life1 Input,
        _ctx: &'life2 SecretaryContext<State>,
    ) -> Pin<Box<dyn Future<Output = Option<Vec<Output>>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait { ... }
    fn after_handle<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _input: &'life1 Input,
        outputs: Vec<Output>,
        _ctx: &'life2 SecretaryContext<State>,
    ) -> Pin<Box<dyn Future<Output = Vec<Output>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait { ... }
}

中间件Trait

可以在输入处理前后执行额外逻辑，如日志、认证、限流等。

Required Methods

fn name(&self) -> &str

中间件名称

Provided Methods

fn before_handle<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _input: &'life1 Input, _ctx: &'life2 SecretaryContext<State>, ) -> Pin<Box<dyn Future<Output = Option<Vec<Output>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

输入预处理

在处理输入之前调用。返回 None 表示不拦截，继续处理。 返回 Some(outputs) 表示拦截输入，直接返回这些输出。

fn after_handle<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _input: &'life1 Input, outputs: Vec<Output>, _ctx: &'life2 SecretaryContext<State>, ) -> Pin<Box<dyn Future<Output = Vec<Output>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

输出后处理

在产生输出后调用。可以修改或过滤输出。

Implementors