From 460093026a28744acf24cd176f83674d5ead63eb Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 21 Nov 2024 17:53:22 -0500
Subject: server dashboard: display duty cycle

---
 server/dashboard.go | 37 ++++++++++++++++++++++++++++---------
 server/duty.go      | 11 ++++-------
 server/server.go    |  7 +++++--
 3 files changed, 37 insertions(+), 18 deletions(-)

(limited to 'server')

diff --git a/server/dashboard.go b/server/dashboard.go
index abe68f1..df71edb 100644
--- a/server/dashboard.go
+++ b/server/dashboard.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/sam-rba/share"
 	"html/template"
 	"log"
 	"net/http"
@@ -20,7 +21,16 @@ const dashboardHtml = `
 				{{ printf "%.1f%%" .Average }}
 			{{- else -}}
 				unknown
-			{{- end }}</p>
+			{{- end -}}
+		</p>
+		<p>Duty cycle:
+			{{/* A value less than 0 means no data. */}}
+			{{- if ge .DutyCycle 0.0 -}}
+				{{ printf "%.1f%%" .DutyCycle }}
+			{{- else -}}
+				unknown
+			{{- end -}}
+		</p>
 		<table>
 			<tr><th>Room</th><th>Humidity</th></tr>
 			{{ range $id, $humidity := .Rooms }}
@@ -43,12 +53,14 @@ const dashboardHtml = `
 var dashboard = template.Must(template.New("dashboard").Parse(dashboardHtml))
 
 type Dashboard struct {
-	Average Humidity
-	Rooms   map[RoomID]Humidity
+	Average   Humidity
+	DutyCycle DutyCycle
+	Rooms     map[RoomID]Humidity
 }
 
 type DashboardHandler struct {
-	Building
+	building  Building
+	dutyCycle share.Val[DutyCycle]
 }
 
 func (h DashboardHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -60,21 +72,28 @@ func (h DashboardHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	db := newDashboard(h.Building)
+	db := h.buildDashboard()
 	err := dashboard.Execute(w, db)
 	if err != nil {
 		log.Println(err)
 	}
 }
 
-func newDashboard(b Building) Dashboard {
-	average, ok := b.average()
+func (h DashboardHandler) buildDashboard() Dashboard {
+	average, ok := h.building.average()
 	if !ok {
 		average = -1
 	}
 
+	var duty DutyCycle
+	if dutyp, ok := h.dutyCycle.TryGet(); ok {
+		duty = *dutyp
+	} else {
+		duty = -1
+	}
+
 	rooms := make(map[RoomID]Humidity)
-	for id, record := range b {
+	for id, record := range h.building {
 		c := make(chan Humidity)
 		record.getRecent <- c
 		humidity, ok := <-c
@@ -84,5 +103,5 @@ func newDashboard(b Building) Dashboard {
 		rooms[id] = humidity
 	}
 
-	return Dashboard{average, rooms}
+	return Dashboard{average, duty, rooms}
 }
diff --git a/server/duty.go b/server/duty.go
index ae32ecb..82bf60f 100644
--- a/server/duty.go
+++ b/server/duty.go
@@ -2,20 +2,19 @@ package main
 
 import (
 	"fmt"
+	"github.com/sam-rba/share"
 	"log"
 	"net/http"
 	"strconv"
-	"sync"
 )
 
 type DutyCycle float32
 
 type DutyCycleHandler struct {
-	mu sync.Mutex
-	dc DutyCycle
+	dc share.Val[DutyCycle]
 }
 
-func (h *DutyCycleHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+func (h DutyCycleHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	log.Println(r.Method, r.URL)
 
 	if r.Method != http.MethodPost {
@@ -30,7 +29,5 @@ func (h *DutyCycleHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	h.mu.Lock()
-	defer h.mu.Unlock()
-	h.dc = DutyCycle(dc)
+	h.dc.Set <- DutyCycle(dc)
 }
diff --git a/server/server.go b/server/server.go
index 7d5e977..b104bbb 100644
--- a/server/server.go
+++ b/server/server.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/sam-rba/share"
 	"log"
 	"net/http"
 )
@@ -17,12 +18,14 @@ type RoomID string
 
 func main() {
 	building := newBuilding(roomIDs)
+	dutyCycle := share.NewVal[DutyCycle]()
 	defer building.Close()
+	defer dutyCycle.Close()
 
-	http.Handle("/", DashboardHandler{building})
+	http.Handle("/", DashboardHandler{building, dutyCycle})
 	http.Handle("/humidity", HumidityHandler{building})
 	http.Handle("/target_humidity", new(TargetHumidityHandler))
-	http.Handle("/duty_cycle", new(DutyCycleHandler))
+	http.Handle("/duty_cycle", DutyCycleHandler{dutyCycle})
 
 	fmt.Printf("Listening on %s...\n", addr)
 	log.Fatal(http.ListenAndServe(addr, nil))
-- 
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