126 lines
4.5 KiB
Rust
126 lines
4.5 KiB
Rust
/// this should move into web3_proxy once the basics are working
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mod errors;
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mod http;
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mod http_proxy;
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mod rate_limit;
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mod users;
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mod ws_proxy;
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use crate::app::Web3ProxyApp;
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use ::http::{Request, StatusCode};
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use axum::{
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body::Body,
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error_handling::HandleError,
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handler::Handler,
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response::Response,
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routing::{get, post},
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Extension, Router,
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};
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use std::net::SocketAddr;
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use std::sync::Arc;
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use tower_http::trace::TraceLayer;
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use tower_request_id::{RequestId, RequestIdLayer};
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use tracing::{error_span, info};
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// handle errors by converting them into something that implements
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// `IntoResponse`
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async fn handle_anyhow_error(err: anyhow::Error) -> (StatusCode, String) {
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// TODO: i dont like this, but lets see if it works. need to moved to the errors module and replace the version that is there
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(
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StatusCode::INTERNAL_SERVER_ERROR,
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format!("Something went wrong: {}", err),
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)
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}
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/// http and websocket frontend for customers
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pub async fn serve(port: u16, proxy_app: Arc<Web3ProxyApp>) -> anyhow::Result<()> {
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// create a tracing span for each request
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let request_tracing_layer =
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TraceLayer::new_for_http().make_span_with(|request: &Request<Body>| {
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// We get the request id from the extensions
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let request_id = request
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.extensions()
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.get::<RequestId>()
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.map(ToString::to_string)
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.unwrap_or_else(|| "unknown".into());
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// And then we put it along with other information into the `request` span
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error_span!(
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"http_request",
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id = %request_id,
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// TODO: do we want these?
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method = %request.method(),
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// uri = %request.uri(),
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)
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});
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// create user endpoint needs some work sothat
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let some_fallible_service = tower::service_fn(|_req| async {
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// thing_that_might_fail().await?;
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Ok::<_, anyhow::Error>(Response::new(Body::empty()))
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});
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// build our application with a route
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// order most to least common
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let app = Router::new()
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.route("/", post(http_proxy::public_proxy_web3_rpc))
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.route("/", get(ws_proxy::public_websocket_handler))
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.route("/u/:user_key", post(http_proxy::user_proxy_web3_rpc))
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.route("/u/:user_key", get(ws_proxy::user_websocket_handler))
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.route("/health", get(http::health))
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.route("/status", get(http::status))
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// .route(
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// "/login",
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// HandleError::new(
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// move |app| async { users::get_login(app).await },
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// handle_anyhow_error,
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// ),
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// )
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.route("/users", post(users::create_user))
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.route(
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"/foo",
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HandleError::new(some_fallible_service, handle_anyhow_error),
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)
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.layer(Extension(proxy_app))
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// create a unique id for each request and add it to our tracing logs
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.layer(request_tracing_layer)
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.layer(RequestIdLayer)
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// 404 for any unknown routes
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.fallback(errors::handler_404.into_service());
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// run our app with hyper
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// TODO: allow only listening on localhost? top_config.app.host.parse()?
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let addr = SocketAddr::from(([0, 0, 0, 0], port));
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info!("listening on port {}", port);
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// TODO: into_make_service is enough if we always run behind a proxy. make into_make_service_with_connect_info optional?
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/*
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It sequentially looks for an IP in:
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- x-forwarded-for header (de-facto standard)
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- x-real-ip header
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- forwarded header (new standard)
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- axum::extract::ConnectInfo (if not behind proxy)
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So we probably won't need into_make_service_with_connect_info, but it shouldn't hurt
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*/
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let service = app.into_make_service_with_connect_info::<SocketAddr>();
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// let service = app.into_make_service();
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// `axum::Server` is a re-export of `hyper::Server`
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axum::Server::bind(&addr)
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// TODO: option to use with_connect_info. we want it in dev, but not when running behind a proxy, but not
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.serve(service)
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.with_graceful_shutdown(signal_shutdown())
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.await
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.map_err(Into::into)
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}
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/// Tokio signal handler that will wait for a user to press CTRL+C.
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/// We use this in our hyper `Server` method `with_graceful_shutdown`.
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async fn signal_shutdown() {
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info!("ctrl-c to quit");
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tokio::signal::ctrl_c()
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.await
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.expect("expect tokio signal ctrl-c");
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info!("signal shutdown");
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}
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