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extern crate bitflags;
extern crate futures;
extern crate http;
extern crate hyper;
extern crate regex;
#[macro_use]
extern crate failure;
extern crate proc_macro_hack;
extern crate reset_router_macros;
#[macro_export]
pub use reset_router_macros::{get, route};
use proc_macro_hack::proc_macro_hack;
#[proc_macro_hack]
pub use reset_router_macros::routes;
pub mod err {
#[derive(Fail, Debug)]
pub enum Error {
#[fail(display = "Could not parse captures")]
Captures,
#[fail(display = "Method not supported")]
MethodNotSupported,
#[fail(display = "{}", _0)]
Io(#[cause] ::std::io::Error),
#[fail(display = "{}", _0)]
Regex(#[cause] ::regex::Error)
}
pub type Result<T> = ::std::result::Result<T, Error>;
impl From<Error> for http::Response<hyper::Body> {
fn from(t: Error) -> Self {
http::Response::builder()
.status(500)
.body(t.to_string().into())
.unwrap()
}
}
}
pub mod bits {
use bitflags::bitflags;
use crate::err;
bitflags! {
pub struct Method: u32 {
const GET = 1;
const POST = 2;
const PUT = 4;
const PATCH = 8;
const HEAD = 16;
const DELETE = 32;
}
}
}
use futures::{Future, IntoFuture};
use http::{Method, Request, Response};
use hyper::Body;
use regex::{Captures, Regex, RegexSet};
use std::{str::FromStr, sync::Arc};
#[derive(Debug)]
pub enum Never {}
impl std::fmt::Display for Never {
fn fmt(&self, _: &mut std::fmt::Formatter) -> std::fmt::Result { match *self {} }
}
impl std::error::Error for Never {
fn description(&self) -> &str { match *self {} }
}
pub trait Handler: Send + Sync {
fn handle(&self, Request<Body>) -> Box<Future<Item = Response<Body>, Error = Never> + Send>;
}
impl<H> Handler for H
where H: Fn(Request<Body>) -> Box<Future<Item = Response<Body>, Error = Never> + Send> + Send + Sync
{
fn handle(
&self,
request: Request<Body>
) -> Box<Future<Item = Response<Body>, Error = Never> + Send>
{
(self)(request)
}
}
pub struct BoxedHandler(pub Box<Handler + Send>);
impl<H, I, S, E> From<H> for BoxedHandler
where
I: IntoFuture<Item = S, Error = E>,
I::Future: 'static + Send,
S: Into<Response<Body>>,
E: Into<Response<Body>>,
H: Fn(Request<Body>) -> I + Sync + Send + 'static
{
fn from(t: H) -> Self {
BoxedHandler(Box::new(move |request: Request<Body>| -> Box<Future<Item = Response<Body>, Error = Never> + Send> {
Box::new(t(request).into_future().map(|s| s.into()).or_else(|e| Ok(e.into())))
}))
}
}
#[derive(Default)]
pub struct MethodMap<T> {
get: T,
post: T,
put: T,
patch: T,
head: T,
delete: T
}
impl<T> MethodMap<T> {
fn get(&self, method: &Method) -> err::Result<&T> {
match *method {
Method::GET => Ok(&self.get),
Method::POST => Ok(&self.post),
Method::PUT => Ok(&self.put),
Method::PATCH => Ok(&self.patch),
Method::HEAD => Ok(&self.head),
Method::DELETE => Ok(&self.delete),
_ => Err(err::Error::MethodNotSupported)
}
}
fn get_mut(&mut self, method: &Method) -> err::Result<&mut T> {
match *method {
Method::GET => Ok(&mut self.get),
Method::POST => Ok(&mut self.post),
Method::PUT => Ok(&mut self.put),
Method::PATCH => Ok(&mut self.patch),
Method::HEAD => Ok(&mut self.head),
Method::DELETE => Ok(&mut self.delete),
_ => Err(err::Error::MethodNotSupported)
}
}
}
pub struct RouterBuilder<'a, S> {
state: Option<S>,
not_found: Option<BoxedHandler>,
path_handler_parts: Vec<(bits::Method, &'a str, u8, BoxedHandler)>
}
impl<'a> RouterBuilder<'a, ()> {
pub fn new() -> Self {
RouterBuilder { state: None, not_found: None, path_handler_parts: Vec::new() }
}
}
impl<'a, S: 'static> RouterBuilder<'a, S> {
fn default_not_found(_: Request<Body>) -> Result<Response<Body>, Response<Body>> {
Ok(http::Response::builder().status(404).body("Not found".into()).unwrap())
}
pub fn with_state<O>(self, state: O) -> RouterBuilder<'a, O> {
let RouterBuilder { not_found, path_handler_parts, .. } = self;
RouterBuilder { state: Some(state), not_found, path_handler_parts }
}
pub fn add_not_found<H>(mut self, handler: H) -> Self
where H: Into<BoxedHandler> + 'static {
self.not_found = Some(handler.into());
self
}
pub fn add<H>(mut self, method: bits::Method, regex: &'a str, handler: H) -> Self
where H: Into<BoxedHandler> + 'static {
self.path_handler_parts.push((method, regex, 0, handler.into()));
self
}
pub fn add_routes(mut self, routes: Vec<(u32, &'a str, u8, BoxedHandler)>) -> Self {
for route in routes {
let (method_bits, regex, priority, handler) = route;
let method = bits::Method::from_bits_truncate(method_bits);
self = self.add_with_priority(method, regex, priority, handler);
}
self
}
pub fn add_with_priority<H>(
mut self,
method: bits::Method,
regex: &'a str,
priority: u8,
handler: H
) -> Self
where
H: Into<BoxedHandler> + 'static
{
self.path_handler_parts.push((method, regex, priority, handler.into()));
self
}
pub fn finish(self) -> err::Result<Router<S>> {
let mut path_handlers_map = ::std::collections::HashMap::new();
let pairs = &[
(bits::Method::GET, Method::GET),
(bits::Method::POST, Method::POST),
(bits::Method::PUT, Method::PUT),
(bits::Method::PATCH, Method::PATCH),
(bits::Method::HEAD, Method::HEAD),
(bits::Method::DELETE, Method::DELETE)
];
for (method, path, priority, handler) in self.path_handler_parts {
let handler = Arc::new(handler);
for pair in pairs.iter() {
if method.contains(pair.0) {
let &mut (ref mut paths, ref mut priorities, ref mut handlers) =
path_handlers_map
.entry(pair.1.clone())
.or_insert_with(|| (Vec::new(), Vec::new(), Vec::new()));
paths.push(path);
priorities.push(priority);
handlers.push(handler.clone());
}
}
}
let mut router = InnerRouter {
state: self.state.map(Arc::new),
not_found: self.not_found.unwrap_or_else(|| Self::default_not_found.into()),
handlers: MethodMap::default()
};
for (method, (paths, priorities, handlers)) in path_handlers_map {
let regex_set = RegexSet::new(paths.iter()).map_err(err::Error::Regex)?;
let mut regexes = Vec::new();
for path in &paths {
regexes.push(Arc::new(Regex::new(path).map_err(err::Error::Regex)?));
}
let path_handlers = PathHandlers { regex_set, regexes, priorities, handlers };
*router.handlers.get_mut(&method)? = Some(path_handlers);
}
Ok(Router(Arc::new(router)))
}
}
struct PathHandlers {
regex_set: RegexSet,
regexes: Vec<Arc<Regex>>,
priorities: Vec<u8>,
handlers: Vec<Arc<BoxedHandler>>
}
struct InnerRouter<S> {
state: Option<Arc<S>>,
not_found: BoxedHandler,
handlers: MethodMap<Option<PathHandlers>>
}
#[derive(Clone)]
pub struct Router<S>(Arc<InnerRouter<S>>);
impl Router<()> {
pub fn build<'a>() -> RouterBuilder<'a, ()> { RouterBuilder::new() }
}
impl<S: 'static + Send + Sync> Handler for Router<S> {
fn handle(
&self,
request: Request<Body>
) -> Box<Future<Item = Response<Body>, Error = Never> + Send>
{
let mut request = request;
if let Some(path_handlers) =
self.0.handlers.get(request.method()).ok().and_then(|x| x.as_ref())
{
let priorities = &path_handlers.priorities;
if let Some(i) = path_handlers
.regex_set
.matches(request.uri().path())
.iter()
.min_by(|x, y| priorities[*x].cmp(&priorities[*y]))
{
let handler = &path_handlers.handlers[i];
let regex = &path_handlers.regexes[i];
{
let extensions_mut = request.extensions_mut();
if let Some(ref state) = self.0.state {
extensions_mut.insert(State(state.clone()));
}
extensions_mut.insert(MatchingRegex(regex.clone()));
}
return (handler.0).handle(request);
}
}
if let Some(ref state) = self.0.state {
request.extensions_mut().insert(State(state.clone()));
}
(((self.0).not_found).0).handle(request)
}
}
pub struct State<S>(pub S);
pub struct MatchingRegex(Arc<Regex>);
pub trait RequestExtensions {
fn captures(&self) -> Option<Captures>;
fn parsed_captures<C: CaptureParsing>(&self) -> err::Result<C>;
fn state<S: Send + Sync + 'static>(&self) -> Option<Arc<S>>;
}
impl RequestExtensions for Request<Body> {
fn captures(&self) -> Option<Captures> {
self.extensions().get::<MatchingRegex>().and_then(|r| r.0.captures(self.uri().path()))
}
fn parsed_captures<C: CaptureParsing>(&self) -> err::Result<C> { Ok(C::parse_captures(self)?) }
fn state<S: Send + Sync + 'static>(&self) -> Option<Arc<S>> {
self.extensions().get::<State<Arc<S>>>().as_ref().map(|x| x.0.clone())
}
}
pub trait CaptureParsing: Sized {
fn parse_captures(request: &Request<Body>) -> err::Result<Self>;
}
impl<U: FromStr> CaptureParsing for (U,) {
fn parse_captures(request: &Request<Body>) -> err::Result<Self> {
let captures = request.captures().ok_or(err::Error::Captures)?;
let out_1 = captures
.get(1)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
Ok((out_1,))
}
}
impl<U1: FromStr, U2: FromStr> CaptureParsing for (U1, U2) {
fn parse_captures(request: &Request<Body>) -> err::Result<Self> {
let captures = request.captures().ok_or(err::Error::Captures)?;
let out_1 = captures
.get(1)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_2 = captures
.get(2)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
Ok((out_1, out_2))
}
}
impl<U1: FromStr, U2: FromStr, U3: FromStr> CaptureParsing for (U1, U2, U3) {
fn parse_captures(request: &Request<Body>) -> err::Result<Self> {
let captures = request.captures().ok_or(err::Error::Captures)?;
let out_1 = captures
.get(1)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_2 = captures
.get(2)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_3 = captures
.get(3)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
Ok((out_1, out_2, out_3))
}
}
impl<U1: FromStr, U2: FromStr, U3: FromStr, U4: FromStr> CaptureParsing for (U1, U2, U3, U4) {
fn parse_captures(request: &Request<Body>) -> err::Result<Self> {
let captures = request.captures().ok_or(err::Error::Captures)?;
let out_1 = captures
.get(1)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_2 = captures
.get(2)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_3 = captures
.get(3)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
let out_4 = captures
.get(4)
.map(|x| x.as_str())
.and_then(|x| x.parse().ok())
.ok_or(err::Error::Captures)?;
Ok((out_1, out_2, out_3, out_4))
}
}
impl<S: 'static + Send + Sync> ::hyper::service::Service for Router<S> {
type Error = Never;
type Future = Box<Future<Item = Response<Self::ResBody>, Error = Self::Error> + Send>;
type ReqBody = Body;
type ResBody = Body;
fn call(&mut self, req: Request<Self::ReqBody>) -> Self::Future { self.handle(req) }
}
impl<S: 'static + Send + Sync + Clone> ::hyper::service::NewService for Router<S> {
type Error = <Router<S> as ::hyper::service::Service>::Error;
type Future = ::futures::future::FutureResult<Router<S>, Never>;
type InitError = Never;
type ReqBody = <Router<S> as ::hyper::service::Service>::ReqBody;
type ResBody = <Router<S> as ::hyper::service::Service>::ResBody;
type Service = Router<S>;
fn new_service(&self) -> Self::Future { ::futures::future::ok(self.clone()) }
}