102 lines
3.1 KiB
Rust
102 lines
3.1 KiB
Rust
use std::net::SocketAddr;
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use std::sync::Arc;
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use hyper::server::conn::AddrStream;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Request, Response, Server};
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use mlua::{Error, Function, Lua, Result, Table, UserData, UserDataMethods};
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#[derive(Clone)]
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struct LuaRequest(Arc<(SocketAddr, Request<Body>)>);
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impl UserData for LuaRequest {
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fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
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methods.add_method("remote_addr", |_lua, req, ()| Ok((req.0).0.to_string()));
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methods.add_method("method", |_lua, req, ()| Ok((req.0).1.method().to_string()));
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}
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}
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async fn run_server(handler: Function<'static>) -> Result<()> {
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let make_svc = make_service_fn(|socket: &AddrStream| {
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let remote_addr = socket.remote_addr();
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let handler = handler.clone();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let handler = handler.clone();
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async move {
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let lua_req = LuaRequest(Arc::new((remote_addr, req)));
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let lua_resp: Table = handler.call_async(lua_req).await?;
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let body = lua_resp
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.get::<_, Option<String>>("body")?
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.unwrap_or_default();
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let mut resp = Response::builder()
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.status(lua_resp.get::<_, Option<u16>>("status")?.unwrap_or(200));
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if let Some(headers) = lua_resp.get::<_, Option<Table>>("headers")? {
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for pair in headers.pairs::<String, String>() {
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let (h, v) = pair?;
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resp = resp.header(&h, v);
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}
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}
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Ok::<_, Error>(resp.body(Body::from(body)).unwrap())
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}
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}))
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}
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});
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let addr = ([127, 0, 0, 1], 3000).into();
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let server = Server::bind(&addr).executor(LocalExec).serve(make_svc);
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println!("Listening on http://{}", addr);
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tokio::task::LocalSet::new()
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.run_until(server)
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.await
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.map_err(Error::external)
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}
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#[tokio::main]
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async fn main() -> Result<()> {
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let lua = Lua::new().into_static();
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let handler: Function = lua
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.load(
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r#"
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function(req)
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return {
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status = 200,
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headers = {
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["X-Req-Method"] = req:method(),
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["X-Remote-Addr"] = req:remote_addr(),
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},
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body = "Hello, World!"
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}
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end
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"#,
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)
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.eval()?;
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run_server(handler).await?;
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// Consume the static reference and drop it.
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// This is safe as long as we don't hold any other references to Lua
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// or alive resources.
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unsafe { Lua::from_static(lua) };
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Ok(())
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}
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#[derive(Clone, Copy, Debug)]
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struct LocalExec;
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impl<F> hyper::rt::Executor<F> for LocalExec
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where
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F: std::future::Future + 'static, // not requiring `Send`
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{
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fn execute(&self, fut: F) {
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tokio::task::spawn_local(fut);
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}
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}
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