Files
security/snow-scanner/src/event_bus.rs

136 lines
4.1 KiB
Rust

use std::{net::IpAddr, str::FromStr};
use crate::{DbConnection, SnowDb};
use hickory_resolver::Name;
use rocket::futures::channel::mpsc as rocket_mpsc;
use rocket::futures::StreamExt;
use rocket::tokio;
use snow_scanner_worker::detection::{detect_scanner_from_name, validate_ip};
use crate::Scanner;
/// Handles all the raw events being streamed from balancers and parses and filters them into only the events we care about.
pub struct EventBus {
events_rx: rocket_mpsc::Receiver<EventBusWriterEvent>,
events_tx: rocket_mpsc::Sender<EventBusWriterEvent>,
bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>,
}
impl EventBus {
pub fn new() -> Self {
let (events_tx, events_rx) = rocket_mpsc::channel(100);
let (bus_tx, _) = tokio::sync::broadcast::channel(100);
Self {
events_rx,
events_tx,
bus_tx,
}
}
// db: &Connection<SnowDb>
pub async fn run(&mut self, mut conn: DbConnection<SnowDb>) {
info!("EventBus started");
loop {
tokio::select! {
Some(event) = self.events_rx.next() => {
self.handle_event(event, &mut conn).await;
}
else => {
warn!("EventBus stopped");
break;
}
}
}
}
async fn handle_event(&self, event: EventBusWriterEvent, db: &mut DbConnection<SnowDb>) {
info!("Received event");
if self.bus_tx.receiver_count() == 0 {
return;
}
match event {
EventBusWriterEvent::ScannerFoundResponse { name, address } => {
let ip: IpAddr = address.into();
if !validate_ip(ip) {
error!("Invalid IP address: {ip}");
return;
}
let name = Name::from_str(name.as_str()).unwrap();
match detect_scanner_from_name(&name) {
Ok(Some(scanner_type)) => {
match Scanner::find_or_new(ip, scanner_type, Some(name), db).await {
Ok(scanner) => {
let _ = scanner.save(db).await;
}
Err(err) => {
error!("Error find or save: {:?}", err);
}
}
}
Ok(None) => {
error!("No name detected for: {:?}", name);
}
Err(err) => {
error!("No name detected error: {:?}", err);
}
};
}
EventBusWriterEvent::BroadcastMessage(msg) => match self.bus_tx.send(msg) {
Ok(count) => {
info!("Event sent to {count} subscribers");
}
Err(err) => {
error!("Error sending event to subscribers: {}", err);
}
},
}
}
pub fn subscriber(&self) -> EventBusSubscriber {
EventBusSubscriber::new(self.bus_tx.clone())
}
pub fn writer(&self) -> EventBusWriter {
EventBusWriter::new(self.events_tx.clone())
}
}
pub type EventBusEvent = rocket_ws::Message;
/// Enables subscriptions to the event bus
pub struct EventBusSubscriber {
bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>,
}
/// Enables subscriptions to the event bus
pub struct EventBusWriter {
bus_tx: rocket_mpsc::Sender<EventBusWriterEvent>,
}
pub enum EventBusWriterEvent {
BroadcastMessage(rocket_ws::Message),
ScannerFoundResponse { name: String, address: IpAddr },
}
impl EventBusWriter {
pub fn new(bus_tx: rocket_mpsc::Sender<EventBusWriterEvent>) -> Self {
Self { bus_tx }
}
pub fn write(&self) -> rocket_mpsc::Sender<EventBusWriterEvent> {
self.bus_tx.clone()
}
}
impl EventBusSubscriber {
pub fn new(bus_tx: tokio::sync::broadcast::Sender<EventBusEvent>) -> Self {
Self { bus_tx }
}
pub fn subscribe(&self) -> tokio::sync::broadcast::Receiver<EventBusEvent> {
self.bus_tx.subscribe()
}
}