Struct MiddlewareChain 

pub struct MiddlewareChain { /* private fields */ }

A chain of middleware that processes queries.

The chain executes middleware in order, with each middleware able to:

• Modify the query context before passing to the next
• Modify the response after receiving from the next
• Short-circuit by not calling next

Implementations

impl MiddlewareChain

pub fn new() -> Self

Create an empty middleware chain.

pub fn with(middlewares: Vec<Arc<dyn Middleware>>) -> Self

Create a chain with initial middleware.

pub fn push<M: Middleware + 'static>(&mut self, middleware: M)

Add middleware to the end of the chain.

pub fn prepend<M: Middleware + 'static>(&mut self, middleware: M)

Add middleware to the beginning of the chain.

pub fn len(&self) -> usize

Get the number of middlewares in the chain.

pub fn is_empty(&self) -> bool

Check if the chain is empty.

pub fn execute<'a, F>( &'a self, ctx: QueryContext, final_handler: F, ) -> BoxFuture<'a, MiddlewareResult<QueryResponse>>

where F: FnOnce(QueryContext) -> BoxFuture<'a, MiddlewareResult<QueryResponse>> + Send + 'a,

Execute the middleware chain.

Trait Implementations

impl Default for MiddlewareChain

fn default() -> Self

Returns the “default value” for a type.

impl From<MiddlewareStack> for MiddlewareChain

fn from(stack: MiddlewareStack) -> Self

Converts to this type from the input type.