429 lines
9.8 KiB
Rust
429 lines
9.8 KiB
Rust
pub mod watcher;
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use std::{
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error::Error,
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collections::*,
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convert::Infallible,
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iter::FromIterator,
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net::SocketAddr,
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sync::{
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Arc
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},
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};
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use dashmap::DashMap;
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use futures::channel::oneshot;
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use handlebars::Handlebars;
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use hyper::{
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Body,
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Method,
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Request,
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Response,
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Server,
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StatusCode,
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};
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use hyper::service::{make_service_fn, service_fn};
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use serde::{
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Deserialize,
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Serialize,
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};
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use tokio::{
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sync::Mutex,
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};
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use crate::{
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http_serde,
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prefix_match,
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};
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/*
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Here's what we need to handle:
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When a request comes in:
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- Park the client in response_rendezvous
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- Look up the server ID in request_rendezvous
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- If a server is parked, unpark it and send the request
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- Otherwise, queue the request
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When a server comes to listen:
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- Look up the server ID in request_rendezvous
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- Either return all pending requests, or park the server
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When a server comes to respond:
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- Look up the parked client in response_rendezvous
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- Unpark the client and begin streaming
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So we need these lookups to be fast:
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- Server IDs, where (1 server) or (0 or many clients)
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can be parked
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- Request IDs, where 1 client is parked
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*/
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enum RequestRendezvous {
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ParkedClients (Vec <http_serde::WrappedRequest>),
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ParkedServer (oneshot::Sender <http_serde::WrappedRequest>),
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}
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type ResponseRendezvous = oneshot::Sender <(http_serde::ResponseParts, Body)>;
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// Stuff we need to load from the config file and use to
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// set up the HTTP server
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#[derive (Default, Deserialize)]
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pub struct ConfigFile {
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pub port: Option <u16>,
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pub server_tripcodes: HashMap <String, String>,
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}
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// Stuff we actually need at runtime
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struct Config {
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server_tripcodes: HashMap <String, blake3::Hash>,
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}
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impl From <&ConfigFile> for Config {
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fn from (f: &ConfigFile) -> Self {
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let trips = HashMap::from_iter (f.server_tripcodes.iter ()
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.map (|(k, v)| {
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use std::convert::TryInto;
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let bytes: Vec <u8> = base64::decode (v).unwrap ();
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let bytes: [u8; 32] = (&bytes [..]).try_into ().unwrap ();
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let v = blake3::Hash::from (bytes);
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(k.clone (), v)
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}));
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Self {
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server_tripcodes: trips,
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}
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}
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}
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pub struct RelayState {
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config: Config,
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handlebars: Arc <Handlebars <'static>>,
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// Key: Server ID
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request_rendezvous: Mutex <HashMap <String, RequestRendezvous>>,
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// Key: Request ID
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response_rendezvous: DashMap <String, ResponseRendezvous>,
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}
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impl Default for RelayState {
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fn default () -> Self {
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Self {
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config: Config::from (&ConfigFile::default ()),
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handlebars: Arc::new (load_templates ().unwrap ()),
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request_rendezvous: Default::default (),
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response_rendezvous: Default::default (),
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}
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}
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}
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impl From <&ConfigFile> for RelayState {
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fn from (config_file: &ConfigFile) -> Self {
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Self {
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config: Config::from (config_file),
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handlebars: Arc::new (load_templates ().unwrap ()),
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request_rendezvous: Default::default (),
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response_rendezvous: Default::default (),
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}
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}
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}
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impl RelayState {
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pub async fn list_servers (&self) -> Vec <String> {
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self.request_rendezvous.lock ().await.iter ()
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.map (|(k, _)| (*k).clone ())
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.collect ()
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}
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}
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fn status_reply <B: Into <Body>> (status: StatusCode, b: B)
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-> Response <Body>
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{
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Response::builder ().status (status).body (b.into ()).unwrap ()
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}
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async fn handle_http_listen (
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state: Arc <RelayState>,
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watcher_code: String,
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api_key: &[u8],
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)
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-> Response <Body>
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{
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let trip_error = status_reply (StatusCode::UNAUTHORIZED, "Bad X-ApiKey");
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let expected_tripcode = match state.config.server_tripcodes.get (&watcher_code) {
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None => {
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eprintln! ("Denied http_listen for non-existent server name {}", watcher_code);
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return trip_error;
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},
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Some (x) => x,
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};
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let actual_tripcode = blake3::hash (api_key);
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if expected_tripcode != &actual_tripcode {
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eprintln! ("Denied http_listen for bad tripcode {}", base64::encode (actual_tripcode.as_bytes ()));
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return trip_error;
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}
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use RequestRendezvous::*;
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let (tx, rx) = oneshot::channel ();
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{
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let mut request_rendezvous = state.request_rendezvous.lock ().await;
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if let Some (ParkedClients (v)) = request_rendezvous.remove (&watcher_code)
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{
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return status_reply (StatusCode::OK, rmp_serde::to_vec (&v).unwrap ());
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}
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request_rendezvous.insert (watcher_code, ParkedServer (tx));
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}
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let one_req = vec! [
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rx.await.unwrap (),
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];
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return status_reply (StatusCode::OK, rmp_serde::to_vec (&one_req).unwrap ());
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}
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async fn handle_http_response (
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req: Request <Body>,
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state: Arc <RelayState>,
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req_id: String,
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)
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-> Response <Body>
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{
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let (parts, body) = req.into_parts ();
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let resp_parts: http_serde::ResponseParts = rmp_serde::from_read_ref (&base64::decode (parts.headers.get (crate::PTTH_MAGIC_HEADER).unwrap ()).unwrap ()).unwrap ();
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match state.response_rendezvous.remove (&req_id) {
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Some ((_, tx)) => {
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match tx.send ((resp_parts, body)) {
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Ok (()) => status_reply (StatusCode::OK, "Connected to remote client...\n"),
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_ => status_reply (StatusCode::BAD_GATEWAY, "Failed to connect to client"),
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}
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},
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None => status_reply (StatusCode::BAD_REQUEST, "Request ID not found in response_rendezvous"),
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}
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}
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async fn handle_http_request (
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req: http::request::Parts,
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uri: String,
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state: Arc <RelayState>,
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watcher_code: String
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)
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-> Response <Body>
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{
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let id = ulid::Ulid::new ().to_string ();
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let req = match http_serde::RequestParts::from_hyper (req.method, uri, req.headers) {
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Ok (x) => x,
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_ => return status_reply (StatusCode::BAD_REQUEST, "Bad request"),
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};
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let (tx, rx) = oneshot::channel ();
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state.response_rendezvous.insert (id.clone (), tx);
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{
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let mut request_rendezvous = state.request_rendezvous.lock ().await;
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let wrapped = http_serde::WrappedRequest {
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id,
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req,
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};
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use RequestRendezvous::*;
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let new_rendezvous = match request_rendezvous.remove (&watcher_code) {
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Some (ParkedClients (mut v)) => {
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v.push (wrapped);
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ParkedClients (v)
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},
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Some (ParkedServer (s)) => {
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// If sending to the server fails, queue it
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match s.send (wrapped) {
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Ok (()) => ParkedClients (vec! []),
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Err (wrapped) => ParkedClients (vec! [wrapped]),
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}
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},
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None => ParkedClients (vec! [wrapped]),
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};
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request_rendezvous.insert (watcher_code, new_rendezvous);
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}
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let timeout = tokio::time::delay_for (std::time::Duration::from_secs (30));
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let received = tokio::select! {
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val = rx => val,
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() = timeout => {
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return status_reply (StatusCode::GATEWAY_TIMEOUT, "Remote server never responded")
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},
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};
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match received {
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Ok ((parts, body)) => {
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let mut resp = Response::builder ()
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.status (hyper::StatusCode::from (parts.status_code));
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for (k, v) in parts.headers.into_iter () {
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resp = resp.header (&k, v);
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}
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resp.body (body)
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.unwrap ()
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},
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_ => status_reply (StatusCode::GATEWAY_TIMEOUT, "Remote server timed out"),
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}
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}
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async fn handle_all (req: Request <Body>, state: Arc <RelayState>)
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-> Result <Response <Body>, Infallible>
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{
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let path = req.uri ().path ();
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//println! ("{}", path);
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let api_key = req.headers ().get ("X-ApiKey");
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if req.method () == Method::POST {
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// This is stuff the server can use. Clients can't
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// POST right now
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return Ok (if let Some (request_code) = prefix_match (path, "/7ZSFUKGV_http_response/") {
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let request_code = request_code.into ();
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handle_http_response (req, state, request_code).await
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}
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else {
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status_reply (StatusCode::BAD_REQUEST, "Can't POST this\n")
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});
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}
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Ok (if let Some (listen_code) = prefix_match (path, "/7ZSFUKGV_http_listen/") {
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let api_key = match api_key {
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None => return Ok (status_reply (StatusCode::UNAUTHORIZED, "Can't register as server without an API key")),
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Some (x) => x,
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};
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handle_http_listen (state, listen_code.into (), api_key.as_bytes ()).await
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}
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else if let Some (rest) = prefix_match (path, "/servers/") {
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if rest == "" {
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#[derive (Serialize)]
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struct ServerEntry <'a> {
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path: &'a str,
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name: &'a str,
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}
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#[derive (Serialize)]
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struct ServerListPage <'a> {
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servers: Vec <ServerEntry <'a>>,
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}
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let names = state.list_servers ().await;
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//println! ("Found {} servers", names.len ());
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let page = ServerListPage {
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servers: names.iter ()
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.map (|name| ServerEntry {
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name: &name,
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path: &name,
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})
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.collect (),
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};
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let s = state.handlebars.render ("relay_server_list", &page).unwrap ();
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status_reply (StatusCode::OK, s)
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}
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else if let Some (idx) = rest.find ('/') {
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let listen_code = String::from (&rest [0..idx]);
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let path = String::from (&rest [idx..]);
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let (parts, _) = req.into_parts ();
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handle_http_request (parts, path, state, listen_code).await
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}
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else {
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status_reply (StatusCode::BAD_REQUEST, "Bad URI format")
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}
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}
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else if path == "/relay_up_check" {
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status_reply (StatusCode::OK, "Relay is up\n")
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}
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else {
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status_reply (StatusCode::OK, "Hi\n")
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})
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}
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pub fn load_templates ()
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-> Result <Handlebars <'static>, Box <dyn Error>>
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{
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let mut handlebars = Handlebars::new ();
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handlebars.set_strict_mode (true);
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for (k, v) in vec! [
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("relay_server_list", "relay_server_list.html"),
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].into_iter () {
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handlebars.register_template_file (k, format! ("ptth_handlebars/{}", v))?;
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}
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Ok (handlebars)
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}
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pub async fn run_relay (
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state: Arc <RelayState>
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)
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-> Result <(), Box <dyn Error>>
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{
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let addr = SocketAddr::from ((
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[0, 0, 0, 0],
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4000,
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));
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eprintln! ("Loaded {} server tripcodes", state.config.server_tripcodes.len ());
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let make_svc = make_service_fn (|_conn| {
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let state = state.clone ();
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async {
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Ok::<_, Infallible> (service_fn (move |req| {
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let state = state.clone ();
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handle_all (req, state)
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}))
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}
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});
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let server = Server::bind (&addr).serve (make_svc);
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server.await?;
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Ok (())
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}
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pub async fn main (config_file: ConfigFile)
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-> Result <(), Box <dyn Error>>
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{
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let state = Arc::new (RelayState::from (&config_file));
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run_relay (state).await
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}
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#[cfg (test)]
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mod tests {
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}
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