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use crate::core::context::Context;
use crate::core::errors::ThrusterError;
use std::boxed::Box;
use std::future::Future;
use std::pin::Pin;
pub type MiddlewareResult<C> = Result<C, ThrusterError<C>>;
pub type MiddlewareReturnValue<C> = Pin<Box<dyn Future<Output = MiddlewareResult<C>> + Send>>;
pub type MiddlewareNext<C> =
Box<dyn Fn(C) -> Pin<Box<dyn Future<Output = MiddlewareResult<C>> + Send>> + Send + Sync>;
pub type MiddlewareFn<C> =
fn(C, MiddlewareNext<C>) -> Pin<Box<dyn Future<Output = MiddlewareResult<C>> + Send>>;
pub struct Middleware<C: 'static> {
pub middleware: &'static [MiddlewareFn<C>],
}
fn chained_run<C: 'static + Context + Send>(
i: usize,
j: usize,
nodes: Vec<&'static Middleware<C>>,
) -> MiddlewareNext<C> {
Box::new(move |ctx| match nodes.get(i) {
Some(n) => match n.middleware.get(j) {
Some(m) => m(ctx, chained_run(i, j + 1, nodes.clone())),
None => chained_run(i + 1, 0, nodes.clone())(ctx),
},
None => {
warn!("Running through the middlewares, 'next' was called without another next in the chain. That's not great! Make sure you have a 404 set.
\tThe route in question is: '{}'
", ctx.route());
Box::pin(async { Ok(ctx) })
}
})
}
pub struct Chain<C: 'static + Context + Send> {
pub nodes: Vec<&'static Middleware<C>>,
built: MiddlewareNext<C>,
}
impl<C: 'static + Context + Send> Chain<C> {
pub fn new(nodes: Vec<&'static Middleware<C>>) -> Chain<C> {
Chain {
nodes,
built: Box::new(|_| panic!("Tried to run an unbuilt chain!")),
}
}
fn chained_run(&self, i: usize, j: usize) -> MiddlewareNext<C> {
chained_run(i, j, self.nodes.clone())
}
fn build(&mut self) {
self.built = self.chained_run(0, 0);
}
fn run(&self, context: C) -> Pin<Box<dyn Future<Output = MiddlewareResult<C>> + Send>> {
(self.built)(context)
}
}
impl<C: 'static + Context + Send> Clone for Chain<C> {
fn clone(&self) -> Self {
let mut chain = Chain::new(self.nodes.clone());
chain.build();
chain
}
}
pub struct MiddlewareChain<T: 'static + Context + Send> {
pub chain: Chain<T>,
pub assigned: bool,
}
impl<T: 'static + Context + Send> MiddlewareChain<T> {
pub fn new() -> Self {
MiddlewareChain {
chain: Chain::new(vec![]),
assigned: false,
}
}
pub fn assign(&mut self, chain: Chain<T>) {
self.chain = chain;
self.assigned = true;
}
pub fn assign_legacy(&mut self, chain: Chain<T>) {
self.assign(chain);
}
pub fn run(&self, context: T) -> Pin<Box<dyn Future<Output = MiddlewareResult<T>> + Send>> {
self.chain.run(context)
}
pub fn chain(&mut self, mut chain: MiddlewareChain<T>) {
self.chain.nodes.append(&mut chain.chain.nodes);
self.assigned = self.assigned || chain.is_assigned();
}
pub fn is_assigned(&self) -> bool {
self.assigned
}
pub fn len(&self) -> usize {
self.chain.nodes.len()
}
}
impl<T: 'static + Context + Send> Default for MiddlewareChain<T> {
fn default() -> Self {
Self::new()
}
}
impl<T: 'static + Context + Send> Clone for MiddlewareChain<T> {
fn clone(&self) -> Self {
MiddlewareChain {
chain: self.chain.clone(),
assigned: self.assigned,
}
}
}