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use std::process::{Child as ChildProcess, Command};
use std::rc::Rc;
use hyper::http::uri::Scheme;
use hyper::{header, Body, Client, Request, Response};
use rhai::{Dynamic, FnPtr, Map};
pub struct KillOnDrop(ChildProcess);
impl Drop for KillOnDrop {
fn drop(&mut self) {
self.0.kill().unwrap();
}
}
#[derive(Clone)]
pub struct ProxyChild {
process: Rc<KillOnDrop>,
port: u16,
}
impl ProxyChild {
fn new(params: Map) -> Self {
let command_line = params["command"].clone().into_immutable_string().unwrap();
let port = params["port"].as_int().unwrap();
let mut command_line = command_line.split(" ");
let command = command_line.next().unwrap();
let mut child = Command::new(command);
child.args(command_line);
if let Some(cwd) = params.get("in_dir") {
let cwd = cwd.clone().into_immutable_string().unwrap();
let cwd: &str = cwd.as_ref();
child.current_dir(cwd);
}
let child = child.spawn().unwrap();
Self {
process: Rc::new(KillOnDrop(child)),
port: port as u16,
}
}
}
pub fn handle_request(child: &mut ProxyChild, request: Rc<Request<Body>>) -> Rc<Response<Body>> {
let ProxyChild { port, .. } = child;
let mut request_uri = request.uri().clone().into_parts();
// TODO ipv6 loopback?
request_uri.authority = Some(format!("127.0.0.1:{}", port).parse().unwrap());
request_uri.scheme = Some(Scheme::HTTP);
let mut proxy_request = Request::builder()
.method(request.method())
.uri(request_uri)
.header(header::HOST, request.headers()[header::HOST].clone());
proxy_request.headers_mut().unwrap().extend(
request
.headers()
.iter()
.map(|(x, y)| (x.clone(), y.clone())),
);
// TODO handle nonempty body
let proxy_request = proxy_request.body(Body::empty()).unwrap();
let response = async {
let client = Client::new();
Rc::new(client.request(proxy_request).await.unwrap())
};
let runtime = tokio::runtime::Handle::current();
runtime.block_on(response)
}
pub fn proxy_child(params: Map) -> FnPtr {
let child = ProxyChild::new(params);
let mut result = FnPtr::new("handle_request_proxy_child").unwrap();
result.add_curry(Dynamic::from(child));
result
}
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