2021-12-11 22:43:41 -05:00
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//! Server process
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2021-12-05 21:28:02 -05:00
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use futures::SinkExt;
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2021-12-05 17:53:26 -05:00
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use futures::StreamExt;
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2022-01-03 18:42:24 -05:00
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use hyper::header::ACCEPT;
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2022-01-01 09:08:54 -05:00
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use hyper::service::{make_service_fn, service_fn};
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use hyper::upgrade::Upgraded;
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use hyper::{
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header, server::conn::AddrStream, upgrade, Body, Request, Response, Server, StatusCode,
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};
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2021-12-05 17:53:26 -05:00
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use log::*;
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2021-12-05 19:14:14 -05:00
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use nostr_rs_relay::close::Close;
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2021-12-29 23:13:02 -05:00
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use nostr_rs_relay::config;
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2021-12-05 17:53:26 -05:00
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use nostr_rs_relay::conn;
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use nostr_rs_relay::db;
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use nostr_rs_relay::error::{Error, Result};
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use nostr_rs_relay::event::Event;
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2022-01-03 18:42:24 -05:00
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use nostr_rs_relay::info::relay_info_json;
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use nostr_rs_relay::protostream;
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use nostr_rs_relay::protostream::NostrMessage::*;
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use nostr_rs_relay::protostream::NostrResponse::*;
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use std::collections::HashMap;
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use std::convert::Infallible;
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2021-12-31 12:51:57 -05:00
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use std::env;
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2022-01-01 09:08:54 -05:00
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use std::net::SocketAddr;
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2021-12-31 12:51:57 -05:00
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use std::path::Path;
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2021-12-05 17:53:26 -05:00
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use tokio::runtime::Builder;
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use tokio::sync::broadcast;
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2021-12-11 16:48:59 -05:00
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use tokio::sync::broadcast::{Receiver, Sender};
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2021-12-05 17:53:26 -05:00
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use tokio::sync::mpsc;
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2021-12-11 16:48:59 -05:00
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use tokio::sync::oneshot;
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2022-01-01 09:08:54 -05:00
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use tokio_tungstenite::WebSocketStream;
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use tungstenite::handshake;
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2021-12-19 17:26:32 -05:00
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use tungstenite::protocol::WebSocketConfig;
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2021-12-05 17:53:26 -05:00
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2021-12-31 12:51:57 -05:00
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fn db_from_args(args: Vec<String>) -> Option<String> {
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2021-12-31 16:19:35 -05:00
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if args.len() == 3 && args.get(1) == Some(&"--db".to_owned()) {
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return args.get(2).map(|x| x.to_owned());
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2021-12-31 12:51:57 -05:00
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}
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None
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}
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2022-01-01 09:08:54 -05:00
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async fn handle_web_request(
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mut request: Request<Body>,
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remote_addr: SocketAddr,
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broadcast: Sender<Event>,
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event_tx: tokio::sync::mpsc::Sender<Event>,
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shutdown: Receiver<()>,
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) -> Result<Response<Body>, Infallible> {
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match (
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request.uri().path(),
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request.headers().contains_key(header::UPGRADE),
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) {
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2022-01-03 18:42:24 -05:00
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// Request for / as websocket
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2022-01-01 09:08:54 -05:00
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("/", true) => {
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debug!("websocket with upgrade request");
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//assume request is a handshake, so create the handshake response
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let response = match handshake::server::create_response_with_body(&request, || {
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Body::empty()
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}) {
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Ok(response) => {
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//in case the handshake response creation succeeds,
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//spawn a task to handle the websocket connection
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tokio::spawn(async move {
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//using the hyper feature of upgrading a connection
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match upgrade::on(&mut request).await {
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//if successfully upgraded
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Ok(upgraded) => {
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//create a websocket stream from the upgraded object
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let ws_stream = WebSocketStream::from_raw_socket(
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//pass the upgraded object
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//as the base layer stream of the Websocket
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upgraded,
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tokio_tungstenite::tungstenite::protocol::Role::Server,
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None,
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)
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.await;
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tokio::spawn(nostr_server(
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ws_stream, broadcast, event_tx, shutdown,
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));
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}
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Err(e) => println!(
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"error when trying to upgrade connection \
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from address {} to websocket connection. \
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Error is: {}",
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remote_addr, e
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),
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}
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});
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//return the response to the handshake request
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response
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}
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Err(error) => {
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warn!("websocket response failed");
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let mut res =
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Response::new(Body::from(format!("Failed to create websocket: {}", error)));
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*res.status_mut() = StatusCode::BAD_REQUEST;
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return Ok(res);
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}
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};
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Ok::<_, Infallible>(response)
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}
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2022-01-03 18:42:24 -05:00
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// Request for Relay info
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2022-01-01 09:08:54 -05:00
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("/", false) => {
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// handle request at root with no upgrade header
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2022-01-03 18:42:24 -05:00
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// Check if this is a nostr server info request
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let accept_header = &request.headers().get(ACCEPT);
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// check if application/nostr+json is included
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if let Some(media_types) = accept_header {
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if let Ok(mt_str) = media_types.to_str() {
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if mt_str.contains("application/nostr+json") {
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let config = config::SETTINGS.read().unwrap();
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// build a relay info response
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debug!("Responding to server info request");
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let b = Body::from(relay_info_json(&config.info));
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return Ok(Response::builder()
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.status(200)
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.header("Content-Type", "application/nostr+json")
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.body(b)
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.unwrap());
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}
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}
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}
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Ok(Response::new(Body::from(
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"Please use a Nostr client to connect.",
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)))
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}
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(_, _) => {
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//handle any other url
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Ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::from("Nothing here."))
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.unwrap())
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}
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}
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}
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async fn shutdown_signal() {
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// Wait for the CTRL+C signal
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tokio::signal::ctrl_c()
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.await
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.expect("failed to install CTRL+C signal handler");
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}
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2021-12-31 12:51:57 -05:00
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2021-12-05 17:53:26 -05:00
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/// Start running a Nostr relay server.
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fn main() -> Result<(), Error> {
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// setup logger
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2021-12-05 17:53:26 -05:00
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let _ = env_logger::try_init();
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2021-12-31 12:51:57 -05:00
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// get database directory from args
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let args: Vec<String> = env::args().collect();
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let db_dir: Option<String> = db_from_args(args);
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{
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let mut settings = config::SETTINGS.write().unwrap();
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// replace default settings with those read from config.toml
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let mut c = config::Settings::new();
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// update with database location
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if let Some(db) = db_dir {
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c.database.data_directory = db;
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}
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*settings = c;
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}
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2022-01-01 09:08:54 -05:00
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2021-12-29 23:47:31 -05:00
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let config = config::SETTINGS.read().unwrap();
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// do some config validation.
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if !Path::new(&config.database.data_directory).is_dir() {
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error!("Database directory does not exist");
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return Err(Error::DatabaseDirError);
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}
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2021-12-30 22:07:21 -05:00
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debug!("config: {:?}", config);
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2021-12-29 23:13:02 -05:00
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let addr = format!("{}:{}", config.network.address.trim(), config.network.port);
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let socket_addr = addr.parse().expect("listening address not valid");
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// configure tokio runtime
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let rt = Builder::new_multi_thread()
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.enable_all()
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.thread_name("tokio-ws")
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.build()
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.unwrap();
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// start tokio
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rt.block_on(async {
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2021-12-29 23:47:31 -05:00
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let settings = config::SETTINGS.read().unwrap();
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info!("listening on: {}", socket_addr);
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2021-12-11 22:43:41 -05:00
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// all client-submitted valid events are broadcast to every
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// other client on this channel. This should be large enough
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// to accomodate slower readers (messages are dropped if
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// clients can not keep up).
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2021-12-29 23:13:02 -05:00
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let (bcast_tx, _) = broadcast::channel::<Event>(settings.limits.broadcast_buffer);
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2021-12-11 22:43:41 -05:00
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// validated events that need to be persisted are sent to the
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// database on via this channel.
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2021-12-29 23:13:02 -05:00
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let (event_tx, event_rx) = mpsc::channel::<Event>(settings.limits.event_persist_buffer);
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2021-12-11 22:43:41 -05:00
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// establish a channel for letting all threads now about a
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// requested server shutdown.
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2021-12-11 16:48:59 -05:00
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let (invoke_shutdown, _) = broadcast::channel::<()>(1);
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2021-12-11 22:43:41 -05:00
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let ctrl_c_shutdown = invoke_shutdown.clone();
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2022-01-01 09:08:54 -05:00
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// // listen for ctrl-c interruupts
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2021-12-11 16:48:59 -05:00
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tokio::spawn(async move {
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tokio::signal::ctrl_c().await.unwrap();
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2021-12-12 11:03:28 -05:00
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info!("shutting down due to SIGINT");
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2021-12-11 22:43:41 -05:00
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ctrl_c_shutdown.send(()).ok();
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2021-12-11 16:48:59 -05:00
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});
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2021-12-30 22:07:21 -05:00
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// start the database writer thread. Give it a channel for
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// writing events, and for publishing events that have been
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// written (to all connected clients).
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db::db_writer(event_rx, bcast_tx.clone(), invoke_shutdown.subscribe()).await;
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2022-01-01 09:08:54 -05:00
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info!("db writer created");
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// A `Service` is needed for every connection, so this
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// creates one from our `handle_request` function.
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let make_svc = make_service_fn(|conn: &AddrStream| {
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let remote_addr = conn.remote_addr();
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let bcast = bcast_tx.clone();
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let event = event_tx.clone();
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let stop = invoke_shutdown.clone();
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async move {
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// service_fn converts our function into a `Service`
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Ok::<_, Infallible>(service_fn(move |request: Request<Body>| {
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handle_web_request(
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request,
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remote_addr,
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bcast.clone(),
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event.clone(),
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stop.subscribe(),
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)
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}))
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2021-12-11 16:48:59 -05:00
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}
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2022-01-01 09:08:54 -05:00
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});
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let server = Server::bind(&socket_addr)
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.serve(make_svc)
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.with_graceful_shutdown(shutdown_signal());
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// run hyper
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if let Err(e) = server.await {
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eprintln!("server error: {}", e);
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2021-12-05 17:53:26 -05:00
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}
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2022-01-01 09:08:54 -05:00
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// our code
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2021-12-05 17:53:26 -05:00
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});
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Ok(())
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}
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2021-12-11 22:43:41 -05:00
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/// Handle new client connections. This runs through an event loop
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/// for all client communication.
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2021-12-05 17:53:26 -05:00
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async fn nostr_server(
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2022-01-01 09:08:54 -05:00
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ws_stream: WebSocketStream<Upgraded>,
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2021-12-05 17:53:26 -05:00
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broadcast: Sender<Event>,
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2021-12-11 16:48:59 -05:00
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event_tx: tokio::sync::mpsc::Sender<Event>,
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mut shutdown: Receiver<()>,
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2021-12-05 17:53:26 -05:00
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) {
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// get a broadcast channel for clients to communicate on
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2021-12-05 21:28:02 -05:00
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let mut bcast_rx = broadcast.subscribe();
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2021-12-29 23:13:02 -05:00
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let mut config = WebSocketConfig::default();
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{
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2021-12-29 23:47:31 -05:00
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let settings = config::SETTINGS.read().unwrap();
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2021-12-29 23:13:02 -05:00
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config.max_message_size = settings.limits.max_ws_message_bytes;
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config.max_frame_size = settings.limits.max_ws_frame_bytes;
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}
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2021-12-11 16:48:59 -05:00
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// upgrade the TCP connection to WebSocket
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2022-01-01 09:08:54 -05:00
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//let conn = tokio_tungstenite::accept_async_with_config(stream, Some(config)).await;
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//let ws_stream = conn.expect("websocket handshake error");
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2021-12-11 16:48:59 -05:00
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// wrap websocket into a stream & sink of Nostr protocol messages
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2021-12-05 17:53:26 -05:00
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let mut nostr_stream = protostream::wrap_ws_in_nostr(ws_stream);
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// Track internal client state
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2021-12-05 19:14:14 -05:00
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let mut conn = conn::ClientConn::new();
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2021-12-11 16:48:59 -05:00
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let cid = conn.get_client_prefix();
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// Create a channel for receiving query results from the database.
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// we will send out the tx handle to any query we generate.
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let (query_tx, mut query_rx) = mpsc::channel::<db::QueryResult>(256);
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// maintain a hashmap of a oneshot channel for active subscriptions.
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// when these subscriptions are cancelled, make a message
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// available to the executing query so it knows to stop.
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//let (abandon_query_tx, _) = oneshot::channel::<()>();
|
|
|
|
|
let mut running_queries: HashMap<String, oneshot::Sender<()>> = HashMap::new();
|
2021-12-12 11:03:28 -05:00
|
|
|
// for stats, keep track of how many events the client published,
|
|
|
|
|
// and how many it received from queries.
|
|
|
|
|
let mut client_published_event_count: usize = 0;
|
|
|
|
|
let mut client_received_event_count: usize = 0;
|
|
|
|
|
info!("new connection for client: {}", cid);
|
2021-12-05 17:53:26 -05:00
|
|
|
loop {
|
|
|
|
|
tokio::select! {
|
2021-12-11 16:48:59 -05:00
|
|
|
_ = shutdown.recv() => {
|
|
|
|
|
// server shutting down, exit loop
|
|
|
|
|
break;
|
|
|
|
|
},
|
|
|
|
|
Some(query_result) = query_rx.recv() => {
|
2021-12-12 11:03:28 -05:00
|
|
|
// database informed us of a query result we asked for
|
2021-12-11 16:48:59 -05:00
|
|
|
let res = EventRes(query_result.sub_id,query_result.event);
|
2021-12-12 11:03:28 -05:00
|
|
|
client_received_event_count += 1;
|
2021-12-11 16:48:59 -05:00
|
|
|
nostr_stream.send(res).await.ok();
|
|
|
|
|
},
|
2021-12-05 21:28:02 -05:00
|
|
|
Ok(global_event) = bcast_rx.recv() => {
|
2021-12-12 11:03:28 -05:00
|
|
|
// an event has been broadcast to all clients
|
|
|
|
|
// first check if there is a subscription for this event.
|
2021-12-14 22:38:26 -05:00
|
|
|
let matching_subs = conn.get_matching_subscriptions(&global_event);
|
|
|
|
|
for s in matching_subs {
|
2021-12-12 11:03:28 -05:00
|
|
|
// TODO: serialize at broadcast time, instead of
|
|
|
|
|
// once for each consumer.
|
|
|
|
|
if let Ok(event_str) = serde_json::to_string(&global_event) {
|
|
|
|
|
debug!("sub match: client: {}, sub: {}, event: {}",
|
2021-12-14 22:38:26 -05:00
|
|
|
cid, s,
|
2021-12-12 11:03:28 -05:00
|
|
|
global_event.get_event_id_prefix());
|
2021-12-05 21:28:02 -05:00
|
|
|
// create an event response and send it
|
2021-12-14 22:38:26 -05:00
|
|
|
let res = EventRes(s.to_owned(),event_str);
|
2021-12-05 21:28:02 -05:00
|
|
|
nostr_stream.send(res).await.ok();
|
2021-12-11 16:48:59 -05:00
|
|
|
} else {
|
|
|
|
|
warn!("could not convert event to string");
|
2021-12-05 21:28:02 -05:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
// check if this client has a subscription
|
2021-12-05 17:53:26 -05:00
|
|
|
proto_next = nostr_stream.next() => {
|
|
|
|
|
match proto_next {
|
2021-12-05 18:15:50 -05:00
|
|
|
Some(Ok(EventMsg(ec))) => {
|
|
|
|
|
// An EventCmd needs to be validated to be converted into an Event
|
2021-12-05 17:53:26 -05:00
|
|
|
// handle each type of message
|
2021-12-05 18:15:50 -05:00
|
|
|
let parsed : Result<Event> = Result::<Event>::from(ec);
|
|
|
|
|
match parsed {
|
2021-12-05 19:14:14 -05:00
|
|
|
Ok(e) => {
|
|
|
|
|
let id_prefix:String = e.id.chars().take(8).collect();
|
2021-12-12 11:03:28 -05:00
|
|
|
debug!("successfully parsed/validated event: {} from client: {}", id_prefix, cid);
|
2021-12-11 16:48:59 -05:00
|
|
|
// Write this to the database
|
|
|
|
|
event_tx.send(e.clone()).await.ok();
|
2021-12-12 11:03:28 -05:00
|
|
|
client_published_event_count += 1;
|
2021-12-05 21:28:02 -05:00
|
|
|
},
|
2021-12-12 11:50:16 -05:00
|
|
|
Err(_) => {
|
|
|
|
|
info!("client {} sent an invalid event", cid);
|
|
|
|
|
nostr_stream.send(NoticeRes("event was invalid".to_owned())).await.ok();
|
|
|
|
|
}
|
2021-12-05 18:15:50 -05:00
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
Some(Ok(SubMsg(s))) => {
|
2021-12-12 11:03:28 -05:00
|
|
|
debug!("client {} requesting a subscription", cid);
|
2021-12-05 19:14:14 -05:00
|
|
|
// subscription handling consists of:
|
2021-12-11 16:48:59 -05:00
|
|
|
// * registering the subscription so future events can be matched
|
|
|
|
|
// * making a channel to cancel to request later
|
|
|
|
|
// * sending a request for a SQL query
|
|
|
|
|
let (abandon_query_tx, abandon_query_rx) = oneshot::channel::<()>();
|
2021-12-12 11:50:16 -05:00
|
|
|
match conn.subscribe(s.clone()) {
|
|
|
|
|
Ok(()) => {
|
|
|
|
|
running_queries.insert(s.id.to_owned(), abandon_query_tx);
|
|
|
|
|
// start a database query
|
|
|
|
|
db::db_query(s, query_tx.clone(), abandon_query_rx).await;
|
|
|
|
|
},
|
|
|
|
|
Err(e) => {
|
|
|
|
|
info!("Subscription error: {}", e);
|
|
|
|
|
nostr_stream.send(NoticeRes(format!("{}",e))).await.ok();
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
2021-12-05 18:33:40 -05:00
|
|
|
},
|
2021-12-05 19:14:14 -05:00
|
|
|
Some(Ok(CloseMsg(cc))) => {
|
|
|
|
|
// closing a request simply removes the subscription.
|
|
|
|
|
let parsed : Result<Close> = Result::<Close>::from(cc);
|
|
|
|
|
match parsed {
|
2021-12-11 16:48:59 -05:00
|
|
|
Ok(c) => {
|
2021-12-12 11:03:28 -05:00
|
|
|
// check if a query is currently
|
|
|
|
|
// running, and remove it if so.
|
2021-12-11 16:48:59 -05:00
|
|
|
let stop_tx = running_queries.remove(&c.id);
|
2021-12-11 22:56:52 -05:00
|
|
|
if let Some(tx) = stop_tx {
|
|
|
|
|
tx.send(()).ok();
|
2021-12-11 16:48:59 -05:00
|
|
|
}
|
2021-12-12 11:03:28 -05:00
|
|
|
// stop checking new events against
|
|
|
|
|
// the subscription
|
2021-12-11 16:48:59 -05:00
|
|
|
conn.unsubscribe(c);
|
|
|
|
|
},
|
2021-12-12 11:50:16 -05:00
|
|
|
Err(_) => {
|
|
|
|
|
info!("invalid command ignored");
|
|
|
|
|
|
|
|
|
|
}
|
2021-12-05 19:14:14 -05:00
|
|
|
}
|
2021-12-05 17:53:26 -05:00
|
|
|
},
|
|
|
|
|
None => {
|
2021-12-12 11:03:28 -05:00
|
|
|
debug!("normal websocket close from client: {}",cid);
|
2021-12-11 16:48:59 -05:00
|
|
|
break;
|
2021-12-05 17:53:26 -05:00
|
|
|
},
|
|
|
|
|
Some(Err(Error::ConnError)) => {
|
2021-12-12 11:03:28 -05:00
|
|
|
debug!("got connection close/error, disconnecting client: {}",cid);
|
2021-12-11 16:48:59 -05:00
|
|
|
break;
|
2021-12-05 17:53:26 -05:00
|
|
|
}
|
2021-12-31 16:19:35 -05:00
|
|
|
Some(Err(Error::EventMaxLengthError(s))) => {
|
|
|
|
|
info!("client {} sent event larger ({} bytes) than max size", cid, s);
|
|
|
|
|
nostr_stream.send(NoticeRes("event exceeded max size".to_owned())).await.ok();
|
|
|
|
|
},
|
2021-12-05 17:53:26 -05:00
|
|
|
Some(Err(e)) => {
|
2021-12-11 16:48:59 -05:00
|
|
|
info!("got non-fatal error from client: {}, error: {:?}", cid, e);
|
2021-12-05 17:53:26 -05:00
|
|
|
},
|
|
|
|
|
}
|
2021-12-11 16:48:59 -05:00
|
|
|
},
|
2021-12-05 17:53:26 -05:00
|
|
|
}
|
|
|
|
|
}
|
2021-12-11 16:48:59 -05:00
|
|
|
// connection cleanup - ensure any still running queries are terminated.
|
|
|
|
|
for (_, stop_tx) in running_queries.into_iter() {
|
|
|
|
|
stop_tx.send(()).ok();
|
|
|
|
|
}
|
2021-12-12 11:03:28 -05:00
|
|
|
info!(
|
|
|
|
|
"stopping connection for client: {} (client sent {} event(s), received {})",
|
|
|
|
|
cid, client_published_event_count, client_received_event_count
|
|
|
|
|
);
|
2021-12-05 09:42:28 -05:00
|
|
|
}
|
