INITIAL
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beans
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module srvr
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go 1.27.0
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
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<title>Macker · Work car</title>
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css">
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<style>
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*{box-sizing:border-box}body{margin:0;background:#f3f5f2;color:#182d26;font:16px system-ui,sans-serif}header{padding:24px 5vw;display:flex;justify-content:space-between;align-items:center}h1{font-size:24px;margin:0}header p{margin:4px 0;color:#607269}main{margin:0 5vw 28px}.stats{display:flex;gap:16px;margin-bottom:20px}.card{background:white;border:1px solid #dce4dd;border-radius:12px;padding:20px;flex:1}.label{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:#607269}.value{display:block;font-size:32px;margin:8px 0}small{color:#607269}#map{height:65vh;min-height:320px;border-radius:14px;border:1px solid #cbd8cd}button{background:#1c593f;color:white;border:0;border-radius:8px;padding:12px;cursor:pointer}#status{margin:12px 0;min-height:24px}@media(max-width:540px){.stats{flex-direction:column;gap:10px}.card{padding:14px}.value{font-size:26px}header{gap:12px}#map{height:50vh}}
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</style>
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</head>
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<body>
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<header><div><h1>Macker</h1><p>Work car · Live location</p></div><button id="follow" type="button">Follow car: on</button></header>
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<main><div class="stats"><section class="card"><span class="label">Current speed</span><strong class="value" id="speed">—</strong><small id="metric">Waiting for GPS</small></section><section class="card"><span class="label">Last update</span><strong class="value" id="age">—</strong><small id="time">No location received yet</small></section></div><p id="status" role="status">Waiting for the car’s first GPS fix…</p><div id="map" aria-label="Car location map"></div></main>
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<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
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<script>
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const el=id=>document.getElementById(id);
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let map, marker, latest, follow=true, failed=false;
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if(window.L){map=L.map('map').setView([20,0],2);L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png',{maxZoom:19,attribution:'© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'}).addTo(map);}
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el('follow').onclick=()=>{follow=!follow;el('follow').textContent=`Follow car: ${follow?'on':'off'}`;if(follow&&marker)map.panTo(marker.getLatLng());};
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function render(){
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if(!latest){el('status').textContent=failed?'Cannot reach server. Retrying…':'Waiting for the car’s first GPS fix…';return;}
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const seconds=Math.max(0,Math.floor((Date.now()-Date.parse(latest.updated_at))/1000));
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const stale=seconds>30,p=latest.point;
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el('age').textContent=seconds<60?`${seconds} s ago`:seconds<3600?`${Math.floor(seconds/60)} min ago`:`${Math.floor(seconds/3600)} h ago`;
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el('time').textContent=new Date(latest.updated_at).toLocaleString();
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el('speed').textContent=stale||p.Speed==null?'—':`${(p.Speed*2.236936).toFixed(1)} mph`;
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el('metric').textContent=stale?'Last fix is stale':p.Speed==null?'Speed unavailable':`${(p.Speed*3.6).toFixed(1)} km/h`;
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el('status').textContent=failed?'Connection lost · showing last known location':stale?'No recent GPS fix · showing last known location':`GPS active · ${p.Lat.toFixed(5)}, ${p.Long.toFixed(5)}`;
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if(!map)el('status').textContent+=' · Map failed to load; reload to retry';
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}
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async function poll(){try{const res=await fetch('/api/location',{cache:'no-store',signal:AbortSignal.timeout(8000)});if(!res.ok)throw Error(res.status);latest=await res.json();failed=false;if(latest&&map){const pos=[latest.point.Lat,latest.point.Long];if(!marker){marker=L.marker(pos).addTo(map);map.setView(pos,15);}else{marker.setLatLng(pos);if(follow)map.panTo(pos);}}}catch(e){failed=true;}render();setTimeout(poll,2000);}
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setInterval(render,1000);poll();
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</script>
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</body></html>
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+118
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package main
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import (
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_ "embed"
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"encoding/gob"
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"encoding/json"
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"flag"
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"io"
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"log"
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"math"
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"net"
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"net/http"
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"sync"
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"time"
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"macker/datapoint"
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)
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//go:embed index.html
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var page []byte
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type location struct {
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Point datapoint.DataPoint `json:"point"`
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UpdatedAt time.Time `json:"updated_at"`
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ReceivedAt time.Time `json:"received_at"`
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}
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type tracker struct {
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mu sync.RWMutex
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latest *location
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}
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func (t *tracker) accept(points []datapoint.DataPoint, now time.Time) {
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t.mu.Lock()
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defer t.mu.Unlock()
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for _, p := range points {
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if math.IsNaN(p.Lat) || math.IsInf(p.Lat, 0) || math.IsNaN(p.Long) || math.IsInf(p.Long, 0) || p.Lat < -90 || p.Lat > 90 || p.Long < -180 || p.Long > 180 {
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continue
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}
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if p.Speed != nil && (math.IsNaN(*p.Speed) || math.IsInf(*p.Speed, 0) || *p.Speed < 0) {
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p.Speed = nil
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}
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updated := now
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if p.Timestamp != 0 {
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if p.Timestamp > uint64(now.Add(time.Minute).UnixMilli()) {
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continue
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}
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updated = time.UnixMilli(int64(p.Timestamp))
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}
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if t.latest != nil && !updated.After(t.latest.UpdatedAt) {
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continue
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}
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t.latest = &location{Point: p, UpdatedAt: updated, ReceivedAt: now}
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}
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}
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func (t *tracker) receive(c net.Conn) {
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defer c.Close()
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_ = c.SetReadDeadline(time.Now().Add(10 * time.Second))
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var raw []byte
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if err := gob.NewDecoder(io.LimitReader(c, 4<<20)).Decode(&raw); err != nil {
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log.Printf("decode batch: %v", err)
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return
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}
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var points []datapoint.DataPoint
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if err := json.Unmarshal(raw, &points); err != nil {
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log.Printf("decode points: %v", err)
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return
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}
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t.accept(points, time.Now().UTC())
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}
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func (t *tracker) handler() http.Handler {
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mux := http.NewServeMux()
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mux.HandleFunc("GET /api/location", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Cache-Control", "no-store")
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t.mu.RLock()
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defer t.mu.RUnlock()
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_ = json.NewEncoder(w).Encode(t.latest)
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})
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mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = w.Write(page)
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})
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return mux
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}
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func main() {
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ingest := flag.String("ingest", ":2948", "TCP address for car GPS batches")
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web := flag.String("http", ":8080", "HTTP address for the map")
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flag.Parse()
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ln, err := net.Listen("tcp", *ingest)
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if err != nil {
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log.Fatal(err)
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}
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defer ln.Close()
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t := &tracker{}
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go func() {
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// Bound concurrent decoders and their memory usage.
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slots := make(chan struct{}, 32)
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for {
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c, err := ln.Accept()
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if err != nil {
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return
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}
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select {
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case slots <- struct{}{}:
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go func() { defer func() { <-slots }(); t.receive(c) }()
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default:
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c.Close()
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}
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}
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}()
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log.Printf("GPS receiver on %s; map on %s", *ingest, *web)
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srv := &http.Server{Addr: *web, Handler: t.handler(), ReadHeaderTimeout: 5 * time.Second, WriteTimeout: 15 * time.Second, IdleTimeout: 60 * time.Second}
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log.Fatal(srv.ListenAndServe())
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}
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@@ -0,0 +1,63 @@
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package main
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import (
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"encoding/gob"
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"encoding/json"
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"net"
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"net/http/httptest"
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"testing"
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"time"
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"macker/datapoint"
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)
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func TestReceiveAndServeLocation(t *testing.T) {
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tr := &tracker{}
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server, client := net.Pipe()
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done := make(chan struct{})
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go func() { tr.receive(server); close(done) }()
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speed := 12.5
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now := time.Now().UTC().Truncate(time.Millisecond)
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point := datapoint.DataPoint{Timestamp: uint64(now.UnixMilli()), Lat: 41.8, Long: -87.6, Speed: &speed}
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raw, err := json.Marshal([]datapoint.DataPoint{point})
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if err != nil {
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t.Fatal(err)
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}
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if err = gob.NewEncoder(client).Encode(raw); err != nil {
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t.Fatal(err)
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}
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client.Close()
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<-done
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rr := httptest.NewRecorder()
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tr.handler().ServeHTTP(rr, httptest.NewRequest("GET", "/api/location", nil))
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var got location
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if err = json.Unmarshal(rr.Body.Bytes(), &got); err != nil {
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t.Fatal(err)
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}
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if rr.Code != 200 || got.Point.Lat != point.Lat || got.Point.Speed == nil || *got.Point.Speed != speed || !got.UpdatedAt.Equal(now) {
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t.Fatalf("unexpected location: %s", rr.Body.String())
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}
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// A delayed batch must not replace the current position.
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tr.accept([]datapoint.DataPoint{{Timestamp: uint64(now.Add(-time.Minute).UnixMilli()), Lat: 20}}, now)
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if tr.latest.Point.Lat != point.Lat {
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t.Fatal("older fix replaced current position")
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}
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}
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func TestEmptyInvalidAndMissingTimestamp(t *testing.T) {
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tr := &tracker{}
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rr := httptest.NewRecorder()
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tr.handler().ServeHTTP(rr, httptest.NewRequest("GET", "/api/location", nil))
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if rr.Body.String() != "null\n" {
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t.Fatal(rr.Body.String())
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}
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now := time.Now().UTC()
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tr.accept([]datapoint.DataPoint{{Lat: 91}, {Long: 181}, {Timestamp: uint64(now.Add(time.Hour).UnixMilli())}}, now)
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if tr.latest != nil {
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t.Fatal("accepted invalid point")
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}
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tr.accept([]datapoint.DataPoint{{Lat: 0, Long: 0}}, now)
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if tr.latest == nil || !tr.latest.UpdatedAt.Equal(now) {
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t.Fatal("missing timestamp should use receipt time")
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}
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}
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