added autorereload and API
This commit is contained in:
Dejan R
parent
8d6076d046
commit
4ddf124174
45
main.go
45
main.go
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@ -20,6 +20,7 @@ import (
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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@ -32,7 +33,7 @@ import (
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//go:embed static
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var staticFiles embed.FS
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const version = "0.9.0"
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const version = "0.9.1"
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// ---------------------------------------------------------------------------
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// Config structs
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@ -484,6 +485,7 @@ type PageData struct {
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ShowGauges bool
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ShowGaugeDigital bool
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ShowTrendChart bool
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UIRevision uint64
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}
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type NumericStats struct {
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@ -528,6 +530,7 @@ var (
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alarmTracker AlarmTracker
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uiTemplate = template.Must(template.New("ui").Parse(uiHTML))
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cachedUI []byte
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uiRevision uint64 = 1
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)
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// ---------------------------------------------------------------------------
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@ -552,7 +555,7 @@ func getConfigSnapshot() Config {
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return cfg
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}
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func buildCachedUI(config Config) ([]byte, error) {
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func buildCachedUI(config Config, revision uint64) ([]byte, error) {
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data := PageData{
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Title: config.UI.Title,
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Subtitle: config.UI.Subtitle,
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@ -579,6 +582,7 @@ func buildCachedUI(config Config) ([]byte, error) {
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ShowGauges: boolValue(config.Modules.ShowGauges, true),
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ShowGaugeDigital: boolValue(config.Modules.ShowGaugeDigital, false),
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ShowTrendChart: boolValue(config.Modules.ShowTrendChart, true),
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UIRevision: revision,
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}
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var buf bytes.Buffer
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@ -590,7 +594,7 @@ func buildCachedUI(config Config) ([]byte, error) {
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func initCachedUI() {
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config := getConfigSnapshot()
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payload, err := buildCachedUI(config)
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payload, err := buildCachedUI(config, atomic.LoadUint64(&uiRevision))
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if err != nil {
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log.Fatalf("failed to pre-render UI template: %v", err)
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}
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@ -655,7 +659,9 @@ func reloadConfigSafely(configPath string) {
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updatedCfg := oldCfg
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hotReloadSectionsLocked(&updatedCfg, newCfg)
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payload, err := buildCachedUI(updatedCfg)
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if len(hotSections) > 0 {
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nextUIRevision := atomic.LoadUint64(&uiRevision) + 1
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payload, err := buildCachedUI(updatedCfg, nextUIRevision)
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if err != nil {
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log.Printf("config reload rejected: failed to rebuild UI: %v", err)
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return
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@ -664,7 +670,9 @@ func reloadConfigSafely(configPath string) {
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cfgMu.Lock()
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cfg = updatedCfg
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cachedUI = payload
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atomic.StoreUint64(&uiRevision, nextUIRevision)
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cfgMu.Unlock()
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}
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if len(hotSections) == 0 && len(restartSections) == 0 {
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log.Printf("config reload checked: no effective changes")
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@ -1764,6 +1772,14 @@ func apiData(w http.ResponseWriter, r *http.Request) {
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_ = json.NewEncoder(w).Encode(snapshotState())
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}
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func apiUIRevision(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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_ = json.NewEncoder(w).Encode(map[string]uint64{
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"revision": atomic.LoadUint64(&uiRevision),
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})
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}
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func apiHistory(w http.ResponseWriter, r *http.Request) {
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window, label, err := parseWindow(r.URL.Query().Get("window"))
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if err != nil {
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@ -1903,6 +1919,7 @@ func main() {
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mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticRoot))))
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mux.HandleFunc("/", serveUI)
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mux.HandleFunc("/api/data", apiData)
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mux.HandleFunc("/api/ui-revision", apiUIRevision)
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mux.HandleFunc("/api/history", apiHistory)
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mux.HandleFunc("/api/trend", apiTrend)
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mux.HandleFunc("/api/alarms", apiAlarms)
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@ -2689,6 +2706,7 @@ const uiHTML = `<!DOCTYPE html>
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const SHOW_GAUGES = {{if .ShowGauges}}true{{else}}false{{end}};
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const SHOW_GAUGE_DIGITAL = {{if .ShowGaugeDigital}}true{{else}}false{{end}};
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const SHOW_TREND_CHART = {{if .ShowTrendChart}}true{{else}}false{{end}};
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const CURRENT_UI_REVISION = {{.UIRevision}};
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const START_ANGLE = Math.PI * 0.75;
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const END_ANGLE = Math.PI * 2.25;
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@ -2698,6 +2716,7 @@ const uiHTML = `<!DOCTYPE html>
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let currentWindow = DEFAULT_WINDOW;
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let currentTrendWindow = DEFAULT_TREND_WINDOW;
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let currentTheme = 'dark';
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let activeUIRevision = CURRENT_UI_REVISION;
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let historyBusy = false;
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let trendBusy = false;
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let alarmsBusy = false;
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@ -3329,6 +3348,22 @@ const uiHTML = `<!DOCTYPE html>
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lineChart.update('none');
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}
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async function checkUIRevision() {
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try {
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const res = await fetch('/api/ui-revision', { cache: 'no-store' });
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if (!res.ok) return;
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const d = await res.json();
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const revision = Number(d.revision) || 0;
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if (revision > activeUIRevision) {
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window.location.reload();
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return;
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}
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activeUIRevision = revision;
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} catch (err) {
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console.warn('UI revision check error:', err);
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}
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}
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async function fetchLiveData() {
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try {
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const res = await fetch('/api/data', { cache: 'no-store' });
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@ -3683,8 +3718,10 @@ const uiHTML = `<!DOCTYPE html>
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fetchHistory();
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fetchTrend();
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fetchAlarms();
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checkUIRevision();
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setInterval(fetchLiveData, POLL_MS);
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setInterval(checkUIRevision, 1200);
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if (SHOW_TREND_CHART) {
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setInterval(fetchHistory, Math.max(1500, POLL_MS * 3));
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