succd: split out http server, daemon state, daemon controller

This improves the structure of the code, separating the data/control
interface out and then implementing the http interface as a user of this
interface.

succbone/succd/main.go

@@ -26,9 +26,9 @@ func main() {
 
 	ctx, _ := signal.NotifyContext(context.Background(), os.Interrupt)
 
-	d := daemon{
-		rpOn: true,
-	}
+	d := daemon{}
+	d.daemonState.rpOn = true
+
 	d.aboveRough.threshold = float64(flagPressureThresholdRough)
 	d.aboveHigh.threshold = float64(flagPressureThresholdHigh)
 	if flagFake {
@@ -65,16 +65,10 @@ func main() {
 		}
 	}
 
-	http.HandleFunc("/", d.httpIndex)
-	http.HandleFunc("/favicon.png", d.httpFavicon)
-	http.HandleFunc("/stream", d.httpStream)
-	http.HandleFunc("/metrics", d.httpMetrics)
-	http.HandleFunc("/button/vent", d.httpButtonVent)
-	http.HandleFunc("/button/pumpdown", d.httpButtonPumpDown)
-	http.HandleFunc("/rp/on", d.httpRoughingPumpEnable)
-	http.HandleFunc("/rp/off", d.httpRoughingPumpDisable)
-	http.HandleFunc("/dp/on", d.httpDiffusionPumpEnable)
-	http.HandleFunc("/dp/off", d.httpDiffusionPumpDisable)
+	httpServer := httpServer{
+		d: &d,
+	}
+	httpServer.setupViews()
 
 	klog.Infof("Listening for HTTP at %s", flagListenHTTP)
 	go func() {