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use futures::future::FutureExt;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use crate::{Callback, additional::Additional, Extractor, http::{Response, Request}};
use std::collections::HashSet;
/// Available methods for HTTP Requests
#[derive(Clone, Hash, Debug)]
pub enum Method {
/// Get method
Get,
/// Post method
Post,
/// Put method
Put,
/// Head method
Head,
/// Delete method
Delete,
/// Patch method
Patch,
/// Options method
Options,
/// Trace method
Trace,
/// Connect method
Connect,
/// Custom method
Custom(String)
}
impl std::fmt::Display for Method {
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(formatter, "{}", self.to_str())
}
}
impl<A: AsRef<str>> From<A> for Method {
fn from(source: A) -> Method {
match source.as_ref() {
"GET" | "get" => Method::Get,
"POST" | "post" => Method::Post,
"PUT" | "put" => Method::Put,
"HEAD" | "head" => Method::Head,
"DELETE" | "delete" => Method::Delete,
"PATCH" | "patch" => Method::Patch,
"OPTIONS" | "options" => Method::Options,
"TRACE" | "trace" => Method::Trace,
"CONNECT" | "connect" => Method::Connect,
custom => Method::Custom(custom.to_string())
}
}
}
impl PartialEq for Method {
fn eq(&self, other: &Self) -> bool {
self.to_str() == other.to_str()
}
}
impl Eq for Method{}
/// Holds multiple methods to make callback management easier
#[derive(Debug)]
pub struct MultipleMethod(HashSet<Method>);
impl MultipleMethod {
/// Turns the Method into a MethodHandler, which is a short for a tuple Method - Handler
///
/// ```rust
/// # use cataclysm::http::Method;
/// let mul = Method::Put.and(Method::Post).and(Method::Patch);
/// ```
pub fn to<T: Sync, F: Callback<A> + Send + Sync + 'static, A: Extractor<T>>(self, handler: F) -> MethodHandler<T> {
MethodHandler{
methods: self.0,
handler: Box::new(move |req: Request, additional: Arc<Additional<T>>| {
match <A as Extractor<T>>::extract(&req, additional) {
Ok(args) => handler.invoke(args).boxed(),
Err(_e) => {
#[cfg(feature = "full_log")]
{
log::error!("extractor error: {}", _e);
let response = _e.as_response();
(async {response}).boxed()
}
#[cfg(not(feature = "full_log"))]
{
(async {Response::bad_request()}).boxed()
}
}
}
})
}
}
/// Adds another method
///
/// ```rust
/// # use cataclysm::http::Method;
/// // This first and belongs to the `Method` struct
/// let mul = Method::Put.and(Method::Post);
/// // This one to the `MultipleMethod` struct
/// let more_mul = mul.and(Method::Patch);
/// ```
pub fn and(mut self, rhs: Method) -> MultipleMethod {
self.0.insert(rhs);
self
}
}
impl Method {
/// Turns the Method into a MethodHandler, which is a short for a tuple Method - Handler
pub fn to<T: Sync, F: Callback<A> + Send + Sync + 'static, A: Extractor<T>>(self, handler: F) -> MethodHandler<T> {
MethodHandler{
methods: vec![self].into_iter().collect(),
handler: Box::new(move |req: Request, additional: Arc<Additional<T>>| {
match <A as Extractor<T>>::extract(&req, additional) {
Ok(args) => handler.invoke(args).boxed(),
Err(_e) => {
#[cfg(feature = "full_log")]
{
log::error!("extractor error: {}", _e);
let response = _e.as_response();
(async {response}).boxed()
}
#[cfg(not(feature = "full_log"))]
{
(async {Response::bad_request()}).boxed()
}
}
}
})
}
}
/// Retrieves the `str` representation of a method (all caps).
///
/// ```rust
/// # use cataclysm::http::Method;
/// assert_eq!("GET", Method::Get.to_str());
/// ```
pub fn to_str(&self) -> &str {
match self {
Method::Get => "GET",
Method::Post => "POST",
Method::Put => "PUT",
Method::Head => "HEAD",
Method::Delete => "DELETE",
Method::Patch => "PATCH",
Method::Options => "OPTIONS",
Method::Trace => "TRACE",
Method::Connect => "CONNECT",
Method::Custom(s) => &s
}
}
/// Makes a [MultipleMethod](crate::http::MultipleMethod)
///
/// In case you want a function to reply to more than one method, you can put as many as you want with the `and` method.
/// ```rust
/// # use cataclysm::http::Method;
/// let mul = Method::Get.and(Method::Post);
/// ```
pub fn and(self, rhs: Method) -> MultipleMethod {
MultipleMethod(vec![self, rhs].into_iter().collect())
}
}
/// Contains a group of methods, and a handler function.
pub struct MethodHandler<T = ()> {
pub(crate) methods: HashSet<Method>,
pub(crate) handler: Box<dyn Fn(Request, Arc<Additional<T>>) -> Pin<Box<dyn Future<Output = Response> + Send>> + Send + Sync>
}