use crate::regex_generator::generate_exact_match_regex;
use crate::types::RequestInfo;
use crate::Error;
use hyper::{body::HttpBody, Response};
use regex::Regex;
use std::fmt::{self, Debug, Formatter};
use std::future::Future;
use std::pin::Pin;
type HandlerWithoutInfo<B, E> = Box<dyn Fn(Response<B>) -> HandlerWithoutInfoReturn<B, E> + Send + Sync + 'static>;
type HandlerWithoutInfoReturn<B, E> = Box<dyn Future<Output = Result<Response<B>, E>> + Send + 'static>;
type HandlerWithInfo<B, E> =
Box<dyn Fn(Response<B>, RequestInfo) -> HandlerWithInfoReturn<B, E> + Send + Sync + 'static>;
type HandlerWithInfoReturn<B, E> = Box<dyn Future<Output = Result<Response<B>, E>> + Send + 'static>;
pub struct PostMiddleware<B, E> {
pub(crate) path: String,
pub(crate) regex: Regex,
pub(crate) handler: Option<Handler<B, E>>,
pub(crate) scope_depth: u32,
}
pub(crate) enum Handler<B, E> {
WithoutInfo(HandlerWithoutInfo<B, E>),
WithInfo(HandlerWithInfo<B, E>),
}
impl<B: HttpBody + Send + Sync + 'static, E: Into<Box<dyn std::error::Error + Send + Sync>> + 'static>
PostMiddleware<B, E>
{
pub(crate) fn new_with_boxed_handler<P: Into<String>>(
path: P,
handler: Handler<B, E>,
scope_depth: u32,
) -> crate::Result<PostMiddleware<B, E>> {
let path = path.into();
let (re, _) = generate_exact_match_regex(path.as_str()).map_err(|e| {
Error::new(format!(
"Could not create an exact match regex for the post middleware path: {}",
e
))
})?;
Ok(PostMiddleware {
path,
regex: re,
handler: Some(handler),
scope_depth,
})
}
pub fn new<P, H, R>(path: P, handler: H) -> crate::Result<PostMiddleware<B, E>>
where
P: Into<String>,
H: Fn(Response<B>) -> R + Send + Sync + 'static,
R: Future<Output = Result<Response<B>, E>> + Send + 'static,
{
let handler: HandlerWithoutInfo<B, E> = Box::new(move |res: Response<B>| Box::new(handler(res)));
PostMiddleware::new_with_boxed_handler(path, Handler::WithoutInfo(handler), 1)
}
pub fn new_with_info<P, H, R>(path: P, handler: H) -> crate::Result<PostMiddleware<B, E>>
where
P: Into<String>,
H: Fn(Response<B>, RequestInfo) -> R + Send + Sync + 'static,
R: Future<Output = Result<Response<B>, E>> + Send + 'static,
{
let handler: HandlerWithInfo<B, E> =
Box::new(move |res: Response<B>, req_info: RequestInfo| Box::new(handler(res, req_info)));
PostMiddleware::new_with_boxed_handler(path, Handler::WithInfo(handler), 1)
}
pub(crate) fn should_require_req_meta(&self) -> bool {
if let Some(ref handler) = self.handler {
match handler {
Handler::WithInfo(_) => true,
Handler::WithoutInfo(_) => false,
}
} else {
false
}
}
pub(crate) async fn process(&self, res: Response<B>, req_info: Option<RequestInfo>) -> crate::Result<Response<B>> {
let handler = self
.handler
.as_ref()
.expect("A router can not be used after mounting into another router");
match handler {
Handler::WithoutInfo(ref handler) => Pin::from(handler(res)).await.map_err(Into::into),
Handler::WithInfo(ref handler) => Pin::from(handler(res, req_info.expect("No RequestInfo is provided")))
.await
.map_err(Into::into),
}
}
}
impl<B, E> Debug for PostMiddleware<B, E> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{{ path: {:?}, regex: {:?} }}", self.path, self.regex)
}
}