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use std::convert::TryFrom;
use std::fmt;
use std::sync::{Arc, Mutex};
use async_trait::async_trait;
use http::uri::Scheme;
use hyper::header::CONNECTION;
use hyper::{Client, Uri};
use hyper_tls::HttpsConnector;
use salvo_core::http::header::{HeaderName, HeaderValue};
use salvo_core::prelude::*;
use salvo_core::{Error, Result};
#[derive(Debug)]
struct MsgError {
msg: String,
}
impl MsgError {
fn new(msg: impl Into<String>) -> MsgError {
MsgError { msg: msg.into() }
}
}
impl fmt::Display for MsgError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.msg)
}
}
impl std::error::Error for MsgError {}
pub struct ProxyHandler {
pub upstreams: Vec<String>,
counter: Arc<Mutex<usize>>,
}
impl ProxyHandler {
pub fn new(upstreams: Vec<String>) -> Self {
if upstreams.is_empty() {
panic!("proxy upstreams is empty");
}
ProxyHandler {
upstreams,
counter: Arc::new(Mutex::new(0)),
}
}
}
impl ProxyHandler {
fn build_proxied_request(&self, req: &mut Request) -> Result<hyper::Request<hyper::body::Body>> {
req.headers_mut().remove(CONNECTION);
let upstream = if self.upstreams.len() > 1 {
let mut counter = self.counter.lock().unwrap();
let upstream = self.upstreams.get(*counter);
*counter = (*counter + 1) % self.upstreams.len();
upstream
} else if !self.upstreams.is_empty() {
self.upstreams.get(0)
} else {
tracing::error!("upstreams is empty");
return Err(salvo_core::Error::new(MsgError::new("upstreams is empty")));
}
.map(|s| &**s)
.unwrap_or_default();
if upstream.is_empty() {
tracing::error!("upstreams is empty");
return Err(salvo_core::Error::new(MsgError::new("upstreams is empty")));
}
let param = req.params().iter().find(|(key, _)| key.starts_with('*'));
let rest = if let Some((_, rest)) = param { rest } else { "" }.trim_start_matches('/');
let forward_url = if let Some(query) = req.uri().query() {
if rest.is_empty() {
format!("{}?{}", upstream, query)
} else {
format!("{}/{}?{}", upstream.trim_end_matches('/'), rest, query)
}
} else {
if rest.is_empty() {
upstream.into()
} else {
format!("{}/{}", upstream.trim_end_matches('/'), rest)
}
};
let forward_url: Uri = TryFrom::try_from(forward_url).map_err(Error::new)?;
let mut build = hyper::Request::builder().method(req.method()).uri(&forward_url);
for (key, value) in req.headers() {
if key.as_str() != "host" {
build = build.header(key, value);
}
}
if let Some(host) = forward_url.host().and_then(|host|HeaderValue::from_str(host).ok()) {
build = build.header(HeaderName::from_static("host"), host);
}
build.body(req.take_body().unwrap_or_default()).map_err(|e| salvo_core::Error::new(e))
}
}
#[async_trait]
impl Handler for ProxyHandler {
async fn handle(&self, req: &mut Request, _depot: &mut Depot, res: &mut Response) {
match self.build_proxied_request(req) {
Ok(proxied_request) => {
let response = if proxied_request.uri().scheme().map(|s| s == &Scheme::HTTPS).unwrap_or(false) {
let client = Client::builder().build::<_, hyper::Body>(HttpsConnector::new());
client.request(proxied_request).await
} else {
let client = Client::new();
client.request(proxied_request).await
};
match response {
Ok(response) => {
let (
http::response::Parts {
status,
headers,
..
},
body,
) = response.into_parts();
res.set_status_code(status);
res.set_headers(headers);
res.set_body(Some(body.into()));
}
Err(e) => {
tracing::error!("error: {}", e);
res.set_status_code(StatusCode::INTERNAL_SERVER_ERROR);
}
};
res.headers_mut().remove(CONNECTION);
}
Err(e) => {
tracing::error!("error when build proxied request: {}", e);
}
}
}
}