165 lines
5.1 KiB
Rust
165 lines
5.1 KiB
Rust
use std::collections::HashMap;
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use std::sync::{Arc, RwLock};
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use std::time::{Duration, Instant};
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use futures::stream::StreamExt;
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use tokio::sync::mpsc::channel;
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use adsb::ICAOAddress;
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use super::beast;
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#[derive(Default)]
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pub struct Entry {
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pub emitter_category: Option<u8>,
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pub callsign: Option<String>,
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pub altitude: Option<u16>,
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cpr1: Option<adsb::CPRFrame>,
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cpr2: Option<adsb::CPRFrame>,
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pub heading: Option<f64>,
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pub ground_speed: Option<f64>,
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pub vertical_rate: Option<i16>,
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pub vertical_rate_source: Option<adsb::VerticalRateSource>,
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last_update: Option<Instant>,
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}
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impl Entry {
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const MAX_AGE: u64 = 300;
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fn update(&mut self, kind: adsb::ADSBMessageKind) {
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match kind {
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adsb::ADSBMessageKind::AirbornePosition {
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altitude, cpr_frame
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} => {
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self.altitude = Some(altitude);
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if self.cpr2.as_ref().map(|cpr2| cpr2.parity != cpr_frame.parity).unwrap_or(false) {
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self.cpr1 = self.cpr2.take();
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}
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self.cpr2 = Some(cpr_frame);
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}
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adsb::ADSBMessageKind::AirborneVelocity {
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heading, ground_speed,
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vertical_rate, vertical_rate_source,
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} => {
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self.heading = Some(heading);
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self.ground_speed = Some(ground_speed);
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self.vertical_rate = Some(vertical_rate);
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self.vertical_rate_source = Some(vertical_rate_source);
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}
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adsb::ADSBMessageKind::AircraftIdentification {
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emitter_category, callsign
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} => {
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self.emitter_category = Some(emitter_category);
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self.callsign = Some(callsign);
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}
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}
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self.last_update = Some(Instant::now());
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}
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pub fn position(&self) -> Option<adsb::Position> {
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match (&self.cpr1, &self.cpr2) {
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(Some(cpr1), Some(cpr2)) => {
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let pos = adsb::cpr::get_position((cpr1, cpr2))?;
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if pos.latitude >= -90.0 && pos.latitude <= 90.0 &&
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pos.longitude >= -180.0 && pos.longitude <= 180.0
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{
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Some(pos)
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} else {
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None
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}
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}
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_ =>
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None
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}
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}
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pub fn flight(&self) -> Option<&str> {
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self.callsign.as_ref().map(|callsign| {
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callsign.split(char::is_whitespace)
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.next().unwrap()
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})
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}
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pub fn altitude_m(&self) -> Option<f64> {
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self.altitude.map(|altitude| altitude as f64 * 0.3048)
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}
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}
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#[derive(Clone)]
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pub struct Aircrafts {
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state: Arc<RwLock<HashMap<ICAOAddress, RwLock<Entry>>>>,
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}
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impl Aircrafts {
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pub fn new() -> Self {
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Aircrafts {
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state: Arc::new(RwLock::new(HashMap::new())),
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}
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}
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pub fn read(&self) -> std::sync::RwLockReadGuard<HashMap<ICAOAddress, RwLock<Entry>>> {
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self.state.read().unwrap()
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}
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pub fn connect(&self, host: &'static str, port: u16) {
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// buffering channel because readsb is very sensitive
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let (tx, mut rx) = channel(16 * 1024);
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// network input
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tokio::spawn(async move {
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loop {
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let mut stream;
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if let Ok(stream_) = beast::connect(host, port).await {
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stream = Box::pin(stream_);
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} else {
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tokio::time::sleep(Duration::from_secs(1)).await;
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// Retry
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continue;
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}
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while let Some(frame) = stream.next().await {
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let _ = tx.send(frame).await;
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}
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}
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});
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// state update
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let state = self.state.clone();
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tokio::spawn(async move {
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while let Some(frame) = rx.recv().await {
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match frame.parse_adsb() {
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Some(adsb::Message {
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kind: adsb::MessageKind::ADSBMessage {
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icao_address,
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kind,
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crc,
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.. },
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.. }) if crc =>
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{
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state.write().unwrap()
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.entry(icao_address)
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.or_default()
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.write().unwrap()
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.update(kind);
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}
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_ => {}
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}
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}
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});
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// discard old states
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let state = self.state.clone();
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tokio::spawn(async move {
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loop {
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state.write().unwrap().
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retain(|_, entry| {
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entry.read().unwrap()
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.last_update.map(|last_update| {
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last_update + Duration::from_secs(Entry::MAX_AGE) > Instant::now()
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})
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.unwrap_or(false)
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});
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tokio::time::sleep(Duration::from_secs(1)).await;
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}
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});
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}
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}
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