mirror of https://github.com/MingweiSamuel/Riven
196 lines
6.2 KiB
Rust
196 lines
6.2 KiB
Rust
// #![deny(warnings)]
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use std::convert::Infallible;
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use http::{Method, Request, Response, StatusCode};
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use hyper::header::HeaderValue;
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use hyper::http;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Server};
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use lazy_static::lazy_static;
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use tracing as log;
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use riven::consts::Route;
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use riven::{RiotApi, RiotApiConfig};
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lazy_static! {
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/// Create lazy static RiotApi instance.
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/// Easier than passing it around.
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pub static ref RIOT_API: RiotApi = {
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let api_key = std::env::var("RGAPI_KEY").ok()
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.or_else(|| {
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let path: std::path::PathBuf = [ env!("CARGO_MANIFEST_DIR"), "../../apikey.txt" ].iter().collect();
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std::fs::read_to_string(path).ok()
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})
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.expect("Failed to find RGAPI_KEY env var or apikey.txt.");
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RiotApi::new(RiotApiConfig::with_key(api_key.trim()).preconfig_burst())
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};
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}
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/// Helper to create JSON error responses.
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fn create_json_response(body: &'static str, status: StatusCode) -> Response<Body> {
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let mut resp = Response::new(Body::from(body));
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*resp.status_mut() = status;
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resp.headers_mut().insert(
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hyper::header::CONTENT_TYPE,
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HeaderValue::from_static("application/json"),
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);
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resp
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}
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/// Main request handler service.
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async fn handle_request(req: Request<Body>) -> Result<Response<Body>, Infallible> {
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let (parts, body) = req.into_parts();
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let http::request::Parts { method, uri, .. } = parts;
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// Handle path.
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let path_data_opt = parse_path(&method, uri.path());
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let (route, method_id, req_path) = match path_data_opt {
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None => {
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return Ok(create_json_response(
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r#"{"error":"Riot API endpoint method not found."}"#,
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StatusCode::NOT_FOUND,
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))
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}
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Some(path_data) => path_data,
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};
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log::debug!(
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"Request to route {:?}, method ID {:?}: {} {:?}.",
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route,
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method_id,
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method,
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req_path
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);
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// Convert http:request::Parts from hyper to reqwest's RequestBuilder.
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let body = match hyper::body::to_bytes(body).await {
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Err(err) => {
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log::info!("Error handling request body: {:#?}", err);
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return Ok(create_json_response(
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r#"{"error":"Failed to handle request body."}"#,
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StatusCode::BAD_REQUEST,
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));
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}
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Ok(bytes) => bytes,
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};
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let req_builder = RIOT_API.request(method, route.into(), req_path).body(body);
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// Send request to Riot API.
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let resp_result = RIOT_API
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.execute_raw(method_id, route.into(), req_builder)
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.await;
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let resp_info = match resp_result {
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Err(err) => {
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log::info!("Riot API error: {:#?}", err.source_reqwest_error());
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return Ok(create_json_response(
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r#"{"error":"Riot API request failed."}"#,
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StatusCode::INTERNAL_SERVER_ERROR,
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));
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}
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Ok(resp_info) => resp_info,
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};
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// Write output.
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let api_response = resp_info.response;
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let mut out_response = Response::default();
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*out_response.headers_mut() = api_response.headers().clone();
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// If None, write "null" to body to be extra nice.
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if resp_info.status_none {
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*out_response.body_mut() = Body::from("null");
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}
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// Otherwise copy body.
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else {
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*out_response.status_mut() = api_response.status();
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// Using streams would be faster.
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let bytes_result = api_response.bytes().await;
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let bytes = match bytes_result {
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Err(_err) => {
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return Ok(create_json_response(
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r#"{"error":"Failed to get body from Riot API response."}"#,
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StatusCode::INTERNAL_SERVER_ERROR,
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))
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}
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Ok(bytes) => bytes,
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};
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*out_response.body_mut() = Body::from(bytes);
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}
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Ok(out_response)
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}
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/// Gets the region, method_id, and Riot API path based on the given http method and path.
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fn parse_path<'a>(
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http_method: &Method,
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req_path: &'a str,
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) -> Option<(Route, &'static str, &'a str)> {
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// Split URI into region and rest of path.
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let req_path = req_path.trim_start_matches('/');
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let (route, req_path) = req_path.split_at(req_path.find('/')?);
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let route: Route = route.to_uppercase().parse().ok()?;
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// Find method_id for given path.
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let method_id = find_matching_method_id(http_method, req_path)?;
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Some((route, method_id, req_path))
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}
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/// Finds the method_id given the request path.
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fn find_matching_method_id(http_method: &Method, req_path: &str) -> Option<&'static str> {
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for (endpoint_http_method, ref_path, method_id) in &riven::meta::ALL_ENDPOINTS {
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if http_method == endpoint_http_method && paths_match(ref_path, req_path) {
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return Some(method_id);
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}
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}
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None
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}
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/// Checks if the request path (req_path) matches the reference path (ref_path).
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fn paths_match(ref_path: &str, req_path: &str) -> bool {
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let mut ref_iter = ref_path.split('/');
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let mut req_iter = req_path.split('/');
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loop {
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match (ref_iter.next(), req_iter.next()) {
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(None, None) => return true,
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(Some(ref_seg), Some(req_seg)) => {
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if ref_seg.starts_with('{') || ref_seg == req_seg {
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continue;
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}
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return false;
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}
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_ => return false,
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}
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}
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}
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#[tokio::main]
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pub async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
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// Setup loggers.
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// env_logger::init();
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tracing_subscriber::fmt::init();
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// Trigger lazy_static.
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let _ = &*RIOT_API;
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// For every connection, we must make a `Service` to handle all
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// incoming HTTP requests on said connection.
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let make_svc = make_service_fn(|_conn| {
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// This is the `Service` that will handle the connection.
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// `service_fn` is a helper to convert a function that
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// returns a Response into a `Service`.
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async { Ok::<_, Infallible>(service_fn(handle_request)) }
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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).serve(make_svc);
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log::info!("Listening on http://{}", addr);
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server.await?;
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Ok(())
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}
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