mirror of
https://github.com/scsibug/nostr-rs-relay.git
synced 2024-05-19 21:24:08 -04:00
4fa8616c73
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619 lines
27 KiB
Rust
619 lines
27 KiB
Rust
//! Server process
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use crate::close::Close;
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use crate::close::CloseCmd;
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use crate::config::{Settings, VerifiedUsersMode};
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use crate::conn;
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use crate::db;
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use crate::db::SubmittedEvent;
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use crate::error::{Error, Result};
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use crate::event::Event;
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use crate::event::EventCmd;
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use crate::info::RelayInfo;
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use crate::nip05;
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use crate::subscription::Subscription;
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use futures::SinkExt;
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use futures::StreamExt;
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use hyper::header::ACCEPT;
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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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use log::*;
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use serde::{Deserialize, Serialize};
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use serde_json::json;
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use std::collections::HashMap;
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use std::convert::Infallible;
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use std::net::SocketAddr;
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use std::path::Path;
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use std::sync::mpsc::Receiver as MpscReceiver;
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use std::time::Duration;
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use std::time::Instant;
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use tokio::runtime::Builder;
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use tokio::sync::broadcast::{self, Receiver, Sender};
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use tokio::sync::mpsc;
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use tokio::sync::oneshot;
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use tokio_tungstenite::WebSocketStream;
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use tungstenite::error::CapacityError::MessageTooLong;
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use tungstenite::error::Error as WsError;
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use tungstenite::handshake;
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use tungstenite::protocol::Message;
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use tungstenite::protocol::WebSocketConfig;
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/// Handle arbitrary HTTP requests, including for WebSocket upgrades.
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async fn handle_web_request(
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mut request: Request<Body>,
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pool: db::SqlitePool,
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settings: Settings,
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remote_addr: SocketAddr,
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broadcast: Sender<Event>,
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event_tx: tokio::sync::mpsc::Sender<SubmittedEvent>,
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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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// Request for / as websocket
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("/", true) => {
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trace!("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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// set WebSocket configuration options
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let config = WebSocketConfig {
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max_message_size: settings.limits.max_ws_message_bytes,
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max_frame_size: settings.limits.max_ws_frame_bytes,
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..Default::default()
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};
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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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Some(config),
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)
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.await;
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tokio::spawn(nostr_server(
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pool, settings, 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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// Request for Relay info
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("/", false) => {
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// handle request at root with no upgrade header
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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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// build a relay info response
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debug!("Responding to server info request");
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let rinfo = RelayInfo::from(settings.info);
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let b = Body::from(serde_json::to_string_pretty(&rinfo).unwrap());
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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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.header("Access-Control-Allow-Origin", "*")
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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::builder()
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.status(200)
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.header("Content-Type", "text/plain")
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.body(Body::from("Please use a Nostr client to connect."))
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.unwrap())
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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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// return on a control-c or internally requested shutdown signal
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async fn ctrl_c_or_signal(mut shutdown_signal: Receiver<()>) {
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loop {
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tokio::select! {
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_ = shutdown_signal.recv() => {
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info!("Shutting down webserver as requested");
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// server shutting down, exit loop
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break;
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},
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_ = tokio::signal::ctrl_c() => {
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info!("Shutting down webserver due to SIGINT");
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break;
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}
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}
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}
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}
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/// Start running a Nostr relay server.
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pub fn start_server(settings: Settings, shutdown_rx: MpscReceiver<()>) -> Result<(), Error> {
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trace!("Config: {:?}", settings);
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// do some config validation.
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if !Path::new(&settings.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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let addr = format!(
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"{}:{}",
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settings.network.address.trim(),
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settings.network.port
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);
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let socket_addr = addr.parse().expect("listening address not valid");
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// address whitelisting settings
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if let Some(addr_whitelist) = &settings.authorization.pubkey_whitelist {
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info!(
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"Event publishing restricted to {} pubkey(s)",
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addr_whitelist.len()
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);
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}
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// check if NIP-05 enforced user verification is on
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if settings.verified_users.is_active() {
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info!(
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"NIP-05 user verification mode:{:?}",
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settings.verified_users.mode
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);
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if let Some(d) = settings.verified_users.verify_update_duration() {
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info!("NIP-05 check user verification every: {:?}", d);
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}
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if let Some(d) = settings.verified_users.verify_expiration_duration() {
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info!("NIP-05 user verification expires after: {:?}", d);
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}
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if let Some(wl) = &settings.verified_users.domain_whitelist {
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info!("NIP-05 domain whitelist: {:?}", wl);
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}
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if let Some(bl) = &settings.verified_users.domain_blacklist {
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info!("NIP-05 domain blacklist: {:?}", bl);
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}
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}
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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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let broadcast_buffer_limit = settings.limits.broadcast_buffer;
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let persist_buffer_limit = settings.limits.event_persist_buffer;
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let verified_users_active = settings.verified_users.is_active();
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let db_min_conn = settings.database.min_conn;
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let db_max_conn = settings.database.max_conn;
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let settings = settings.clone();
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info!("listening on: {}", socket_addr);
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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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let (bcast_tx, _) = broadcast::channel::<Event>(broadcast_buffer_limit);
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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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let (event_tx, event_rx) = mpsc::channel::<SubmittedEvent>(persist_buffer_limit);
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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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let (invoke_shutdown, shutdown_listen) = broadcast::channel::<()>(1);
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// create a channel for sending any new metadata event. These
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// will get processed relatively slowly (a potentially
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// multi-second blocking HTTP call) on a single thread, so we
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// buffer requests on the channel. No harm in dropping events
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// here, since we are protecting against DoS. This can make
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// it difficult to setup initial metadata in bulk, since
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// overwhelming this will drop events and won't register
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// metadata events.
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let (metadata_tx, metadata_rx) = broadcast::channel::<Event>(4096);
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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(
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settings.clone(),
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event_rx,
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bcast_tx.clone(),
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metadata_tx.clone(),
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shutdown_listen,
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)
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.await;
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info!("db writer created");
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// create a nip-05 verifier thread; if enabled.
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if settings.verified_users.mode != VerifiedUsersMode::Disabled {
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let verifier_opt =
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nip05::Verifier::new(metadata_rx, bcast_tx.clone(), settings.clone());
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if let Ok(mut v) = verifier_opt {
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if verified_users_active {
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tokio::task::spawn(async move {
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info!("starting up NIP-05 verifier...");
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v.run().await;
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});
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}
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}
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}
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// listen for (external to tokio) shutdown request
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let controlled_shutdown = invoke_shutdown.clone();
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tokio::spawn(async move {
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info!("control message listener started");
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match shutdown_rx.recv() {
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Ok(()) => {
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info!("control message requesting shutdown");
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controlled_shutdown.send(()).ok();
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}
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Err(std::sync::mpsc::RecvError) => {
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debug!("shutdown requestor is disconnected");
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}
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};
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});
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// listen for ctrl-c interruupts
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let ctrl_c_shutdown = invoke_shutdown.clone();
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// listener for webserver shutdown
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let webserver_shutdown_listen = invoke_shutdown.subscribe();
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tokio::spawn(async move {
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tokio::signal::ctrl_c().await.unwrap();
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info!("shutting down due to SIGINT (main)");
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ctrl_c_shutdown.send(()).ok();
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});
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// build a connection pool for sqlite connections
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let pool = db::build_pool(
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"client query",
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settings.clone(),
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rusqlite::OpenFlags::SQLITE_OPEN_READ_ONLY
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| rusqlite::OpenFlags::SQLITE_OPEN_SHARED_CACHE,
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db_min_conn,
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db_max_conn,
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true,
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);
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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 svc_pool = pool.clone();
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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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let settings = settings.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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svc_pool.clone(),
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settings.clone(),
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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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}
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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(ctrl_c_or_signal(webserver_shutdown_listen));
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// run hyper in this thread. This is why the thread does not return.
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if let Err(e) = server.await {
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eprintln!("server error: {}", e);
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}
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});
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Ok(())
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}
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/// Nostr protocol messages from a client
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#[derive(Deserialize, Serialize, Clone, PartialEq, Debug)]
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#[serde(untagged)]
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pub enum NostrMessage {
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/// An `EVENT` message
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EventMsg(EventCmd),
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/// A `REQ` message
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SubMsg(Subscription),
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/// A `CLOSE` message
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CloseMsg(CloseCmd),
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}
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/// Convert Message to NostrMessage
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fn convert_to_msg(msg: String, max_bytes: Option<usize>) -> Result<NostrMessage> {
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let parsed_res: Result<NostrMessage> = serde_json::from_str(&msg).map_err(|e| e.into());
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match parsed_res {
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Ok(m) => {
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if let NostrMessage::EventMsg(_) = m {
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if let Some(max_size) = max_bytes {
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// check length, ensure that some max size is set.
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if msg.len() > max_size && max_size > 0 {
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return Err(Error::EventMaxLengthError(msg.len()));
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}
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}
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}
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Ok(m)
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}
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Err(e) => {
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debug!("proto parse error: {:?}", e);
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debug!("parse error on message: {}", msg.trim());
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Err(Error::ProtoParseError)
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}
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}
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}
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/// Turn a string into a NOTICE message ready to send over a WebSocket
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fn make_notice_message(msg: &str) -> Message {
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Message::text(json!(["NOTICE", msg]).to_string())
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}
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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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async fn nostr_server(
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pool: db::SqlitePool,
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settings: Settings,
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mut ws_stream: WebSocketStream<Upgraded>,
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broadcast: Sender<Event>,
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event_tx: mpsc::Sender<SubmittedEvent>,
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mut shutdown: Receiver<()>,
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) {
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// get a broadcast channel for clients to communicate on
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let mut bcast_rx = broadcast.subscribe();
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// Track internal client state
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let mut conn = conn::ClientConn::new();
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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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// Create channel for receiving NOTICEs
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let (notice_tx, mut notice_rx) = mpsc::channel::<String>(32);
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// last time this client sent data (message, ping, etc.)
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let mut last_message_time = Instant::now();
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// ping interval (every 5 minutes)
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let default_ping_dur = Duration::from_secs(300);
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// disconnect after 20 minutes without a ping response or event.
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let max_quiet_time = Duration::from_secs(60 * 20);
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let start = tokio::time::Instant::now() + default_ping_dur;
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let mut ping_interval = tokio::time::interval_at(start, default_ping_dur);
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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 mut running_queries: HashMap<String, oneshot::Sender<()>> = HashMap::new();
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// for stats, keep track of how many events the client published,
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// and how many it received from queries.
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let mut client_published_event_count: usize = 0;
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let mut client_received_event_count: usize = 0;
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info!("new connection for client: {:?}", cid);
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loop {
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tokio::select! {
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_ = shutdown.recv() => {
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info!("Shutting client connection down due to shutdown: {:?}", cid);
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// server shutting down, exit loop
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break;
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},
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_ = ping_interval.tick() => {
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// check how long since we talked to client
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// if it has been too long, disconnect
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if last_message_time.elapsed() > max_quiet_time {
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debug!("ending connection due to lack of client ping response");
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break;
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}
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// Send a ping
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ws_stream.send(Message::Ping(Vec::new())).await.ok();
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},
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Some(notice_msg) = notice_rx.recv() => {
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ws_stream.send(make_notice_message(¬ice_msg)).await.ok();
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},
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Some(query_result) = query_rx.recv() => {
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// database informed us of a query result we asked for
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let subesc = query_result.sub_id.replace('"', "");
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if query_result.event == "EOSE" {
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let send_str = format!("[\"EOSE\",\"{}\"]", subesc);
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ws_stream.send(Message::Text(send_str)).await.ok();
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} else {
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client_received_event_count += 1;
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// send a result
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let send_str = format!("[\"EVENT\",\"{}\",{}]", subesc, &query_result.event);
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ws_stream.send(Message::Text(send_str)).await.ok();
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}
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},
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// TODO: consider logging the LaggedRecv error
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Ok(global_event) = bcast_rx.recv() => {
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// an event has been broadcast to all clients
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// first check if there is a subscription for this event.
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let matching_subs = conn.get_matching_subscriptions(&global_event);
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for s in matching_subs {
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// TODO: serialize at broadcast time, instead of
|
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// once for each consumer.
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if let Ok(event_str) = serde_json::to_string(&global_event) {
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debug!("sub match for client: {:?}, sub: {:?}, event: {:?}",
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cid, s,
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global_event.get_event_id_prefix());
|
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// create an event response and send it
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let subesc = s.replace('"', "");
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ws_stream.send(Message::Text(format!("[\"EVENT\",\"{}\",{}]", subesc, event_str))).await.ok();
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} else {
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warn!("could not serialize event: {:?}", global_event.get_event_id_prefix());
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}
|
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}
|
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},
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ws_next = ws_stream.next() => {
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// update most recent message time for client
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last_message_time = Instant::now();
|
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// Consume text messages from the client, parse into Nostr messages.
|
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let nostr_msg = match ws_next {
|
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Some(Ok(Message::Text(m))) => {
|
|
convert_to_msg(m,settings.limits.max_event_bytes)
|
|
},
|
|
Some(Ok(Message::Binary(_))) => {
|
|
ws_stream.send(
|
|
make_notice_message("binary messages are not accepted")).await.ok();
|
|
continue;
|
|
},
|
|
Some(Ok(Message::Ping(_))) | Some(Ok(Message::Pong(_))) => {
|
|
// get a ping/pong, ignore. tungstenite will
|
|
// send responses automatically.
|
|
continue;
|
|
},
|
|
Some(Err(WsError::Capacity(MessageTooLong{size, max_size}))) => {
|
|
ws_stream.send(
|
|
make_notice_message(
|
|
&format!("message too large ({} > {})",size, max_size))).await.ok();
|
|
continue;
|
|
},
|
|
None |
|
|
Some(Ok(Message::Close(_))) |
|
|
Some(Err(WsError::AlreadyClosed)) |
|
|
Some(Err(WsError::ConnectionClosed)) |
|
|
Some(Err(WsError::Protocol(tungstenite::error::ProtocolError::ResetWithoutClosingHandshake)))
|
|
=> {
|
|
debug!("websocket close from client: {:?}",cid);
|
|
break;
|
|
},
|
|
Some(Err(WsError::Io(e))) => {
|
|
// IO errors are considered fatal
|
|
warn!("IO error (client: {:?}): {:?}", cid, e);
|
|
break;
|
|
}
|
|
x => {
|
|
// default condition on error is to close the client connection
|
|
info!("unknown error (client: {:?}): {:?} (closing conn)", cid, x);
|
|
break;
|
|
}
|
|
};
|
|
|
|
// convert ws_next into proto_next
|
|
match nostr_msg {
|
|
Ok(NostrMessage::EventMsg(ec)) => {
|
|
// An EventCmd needs to be validated to be converted into an Event
|
|
// handle each type of message
|
|
let parsed : Result<Event> = Result::<Event>::from(ec);
|
|
match parsed {
|
|
Ok(e) => {
|
|
let id_prefix:String = e.id.chars().take(8).collect();
|
|
debug!("successfully parsed/validated event: {:?} from client: {:?}", id_prefix, cid);
|
|
// check if the event is too far in the future.
|
|
if e.is_valid_timestamp(settings.options.reject_future_seconds) {
|
|
// Write this to the database.
|
|
let submit_event = SubmittedEvent { event: e.clone(), notice_tx: notice_tx.clone() };
|
|
event_tx.send(submit_event).await.ok();
|
|
client_published_event_count += 1;
|
|
} else {
|
|
info!("client {:?} sent a far future-dated event", cid);
|
|
if let Some(fut_sec) = settings.options.reject_future_seconds {
|
|
ws_stream.send(make_notice_message(&format!("The event created_at field is out of the acceptable range (+{}sec) for this relay and was not stored.",fut_sec))).await.ok();
|
|
}
|
|
}
|
|
},
|
|
Err(_) => {
|
|
info!("client {:?} sent an invalid event", cid);
|
|
ws_stream.send(make_notice_message("event was invalid")).await.ok();
|
|
}
|
|
}
|
|
},
|
|
Ok(NostrMessage::SubMsg(s)) => {
|
|
debug!("client {} requesting a subscription", cid);
|
|
// subscription handling consists of:
|
|
// * 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::<()>();
|
|
match conn.subscribe(s.clone()) {
|
|
Ok(()) => {
|
|
// when we insert, if there was a previous query running with the same name, cancel it.
|
|
if let Some(previous_query) = running_queries.insert(s.id.to_owned(), abandon_query_tx) {
|
|
previous_query.send(()).ok();
|
|
}
|
|
// start a database query
|
|
db::db_query(s, cid.to_owned(), pool.clone(), query_tx.clone(), abandon_query_rx).await;
|
|
},
|
|
Err(e) => {
|
|
info!("Subscription error: {}", e);
|
|
ws_stream.send(make_notice_message(&e.to_string())).await.ok();
|
|
}
|
|
}
|
|
},
|
|
Ok(NostrMessage::CloseMsg(cc)) => {
|
|
// closing a request simply removes the subscription.
|
|
let parsed : Result<Close> = Result::<Close>::from(cc);
|
|
match parsed {
|
|
Ok(c) => {
|
|
// check if a query is currently
|
|
// running, and remove it if so.
|
|
let stop_tx = running_queries.remove(&c.id);
|
|
if let Some(tx) = stop_tx {
|
|
tx.send(()).ok();
|
|
}
|
|
// stop checking new events against
|
|
// the subscription
|
|
conn.unsubscribe(c);
|
|
},
|
|
Err(_) => {
|
|
info!("invalid command ignored");
|
|
ws_stream.send(make_notice_message("could not parse command")).await.ok();
|
|
}
|
|
}
|
|
},
|
|
Err(Error::ConnError) => {
|
|
debug!("got connection close/error, disconnecting client: {:?}",cid);
|
|
break;
|
|
}
|
|
Err(Error::EventMaxLengthError(s)) => {
|
|
info!("client {:?} sent event larger ({} bytes) than max size", cid, s);
|
|
ws_stream.send(make_notice_message("event exceeded max size")).await.ok();
|
|
},
|
|
Err(Error::ProtoParseError) => {
|
|
info!("client {:?} sent event that could not be parsed", cid);
|
|
ws_stream.send(make_notice_message("could not parse command")).await.ok();
|
|
},
|
|
Err(e) => {
|
|
info!("got non-fatal error from client: {:?}, error: {:?}", cid, e);
|
|
},
|
|
}
|
|
},
|
|
}
|
|
}
|
|
// connection cleanup - ensure any still running queries are terminated.
|
|
for (_, stop_tx) in running_queries.into_iter() {
|
|
stop_tx.send(()).ok();
|
|
}
|
|
info!(
|
|
"stopping connection for client: {:?} (client sent {} event(s), received {})",
|
|
cid, client_published_event_count, client_received_event_count
|
|
);
|
|
}
|