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use io::FutureResponse;
use calls::Metadata;
use types::Request;
pub trait Middleware<M: Metadata>: Send + Sync + 'static {
fn on_request<F>(&self, request: Request, meta: M, next: F) -> FutureResponse where
F: FnOnce(Request, M) -> FutureResponse;
}
#[derive(Default)]
pub struct Noop;
impl<M: Metadata> Middleware<M> for Noop {
fn on_request<F>(&self, request: Request, meta: M, process: F) -> FutureResponse where
F: FnOnce(Request, M) -> FutureResponse,
{
process(request, meta)
}
}
impl<M: Metadata, A: Middleware<M>, B: Middleware<M>>
Middleware<M> for (A, B)
{
fn on_request<F>(&self, request: Request, meta: M, process: F) -> FutureResponse where
F: FnOnce(Request, M) -> FutureResponse,
{
self.0.on_request(request, meta, move |request, meta| {
self.1.on_request(request, meta, process)
})
}
}
impl<M: Metadata, A: Middleware<M>, B: Middleware<M>, C: Middleware<M>>
Middleware<M> for (A, B, C)
{
fn on_request<F>(&self, request: Request, meta: M, process: F) -> FutureResponse where
F: FnOnce(Request, M) -> FutureResponse,
{
self.0.on_request(request, meta, move |request, meta| {
self.1.on_request(request, meta, move |request, meta| {
self.2.on_request(request, meta, process)
})
})
}
}
impl<M: Metadata, A: Middleware<M>, B: Middleware<M>, C: Middleware<M>, D: Middleware<M>>
Middleware<M> for (A, B, C, D)
{
fn on_request<F>(&self, request: Request, meta: M, process: F) -> FutureResponse where
F: FnOnce(Request, M) -> FutureResponse,
{
self.0.on_request(request, meta, move |request, meta| {
self.1.on_request(request, meta, move |request, meta| {
self.2.on_request(request, meta, move |request, meta| {
self.3.on_request(request, meta, process)
})
})
})
}
}