server dashboard

author: Sam Anthony <sam@samanthony.xyz> 2024-11-21 16:47:08 -0500
committer: Sam Anthony <sam@samanthony.xyz> 2024-11-21 16:47:08 -0500
commit: dbc71139a5708b371ffb0b7580f562674707c558 (patch)
tree: 1ee13dbfa44588a723a0d1fdf4eb24f5d76a9158 /server
parent: a464e144485f69fd9ae6efee3e3fe5e00590e6de (diff)
download: soen422-dbc71139a5708b371ffb0b7580f562674707c558.zip
4 files changed, 126 insertions, 42 deletions
diff --git a/server/building.go b/server/building.go
new file mode 100644
index 0000000..c7d298f
--- /dev/null
+++ b/server/building.go
@@ -0,0 +1,40 @@
+package main
+
+import "log"
+
+type Building map[RoomID]Record[Humidity]
+
+func newBuilding(roomIDs []RoomID) Building {
+	b := make(Building)
+	for _, id := range roomIDs {
+		b[id] = newRecord[Humidity]()
+	}
+	return b
+}
+
+func (b Building) Close() {
+	for _, record := range b {
+		record.Close()
+	}
+}
+
+// Calculate the average humidity in the building. Returns false if there is not enough data available.
+func (b Building) average() (Humidity, bool) {
+	var sum Humidity = 0
+	nRooms := 0
+	for room, record := range b {
+		c := make(chan Humidity)
+		record.getRecent <- c
+		if humidity, ok := <-c; ok {
+			sum += humidity
+			nRooms++
+		} else {
+			log.Printf("Warning: no humidity for room '%s'\n", room)
+		}
+	}
+	if nRooms == 0 {
+		log.Println("Warning: not enough data to calculate average humidity")
+		return -1.0, false
+	}
+	return sum / Humidity(nRooms), true
+}
diff --git a/server/dashboard.go b/server/dashboard.go
new file mode 100644
index 0000000..0e9cd41
--- /dev/null
+++ b/server/dashboard.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+const dashboardHtml = `
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>HVAC Dashboard</title>
+	</head>
+	<body>
+		<p>Average humidity: {{ printf "%.1f %%" .Average }}</p>
+		<table>
+			<tr><th>Room</th><th>Humidity</th></tr>
+			{{ range .Rooms }}
+				<tr><td>{{ .RoomID }}</td><td>{{ printf "%.1f %%" .Humidity }}</td></tr>
+			{{ end }}
+		</table>
+	</body>
+</html>`
+
+var dashboard = template.Must(template.New("dashboard").Parse(dashboardHtml))
+
+type Dashboard struct {
+	Average Humidity
+	Rooms   []Room
+}
+
+type Room struct {
+	RoomID
+	Humidity
+}
+
+type DashboardHandler struct {
+	Building
+}
+
+func (h DashboardHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Println(r.Method, r.URL)
+
+	if r.Method != http.MethodGet {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		fmt.Fprintf(w, "invalid method: '%s'", r.Method)
+		return
+	}
+
+	db := newDashboard(h.Building)
+	err := dashboard.Execute(w, db)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func newDashboard(b Building) Dashboard {
+	average, ok := b.average()
+	if !ok {
+		average = -1
+	}
+
+	// TODO: sort by room ID.
+	rooms := make([]Room, 0, len(b))
+	for id, record := range b {
+		c := make(chan Humidity)
+		record.getRecent <- c
+		humidity, ok := <-c
+		if !ok {
+			humidity = -1
+		}
+		rooms = append(rooms, Room{id, humidity})
+	}
+
+	return Dashboard{average, rooms}
+}
diff --git a/server/humidity.go b/server/humidity.go
index 3982545..8cffccc 100644
--- a/server/humidity.go
+++ b/server/humidity.go
@@ -11,21 +11,7 @@ import (
 type Humidity float32
 
 type HumidityHandler struct {
-	rooms map[RoomID]Record[Humidity]
-}
-
-func newHumidityHandler(rooms []RoomID) HumidityHandler {
-	h := HumidityHandler{make(map[RoomID]Record[Humidity])}
-	for _, id := range rooms {
-		h.rooms[id] = newRecord[Humidity]()
-	}
-	return h
-}
-
-func (h HumidityHandler) Close() {
-	for _, record := range h.rooms {
-		record.Close()
-	}
+	Building
 }
 
 func (h HumidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -42,7 +28,7 @@ func (h HumidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h HumidityHandler) get(w http.ResponseWriter, r *http.Request) {
-	if humidity, ok := h.average(); ok {
+	if humidity, ok := h.Building.average(); ok {
 		fmt.Fprintf(w, "%.2f", humidity)
 	} else {
 		w.WriteHeader(http.StatusGone)
@@ -65,7 +51,7 @@ func (h HumidityHandler) post(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	record, ok := h.rooms[room]
+	record, ok := h.Building[room]
 	if !ok {
 		badRequest(w, "invalid room ID: '%s'", room)
 		return
@@ -74,27 +60,6 @@ func (h HumidityHandler) post(w http.ResponseWriter, r *http.Request) {
 	record.put <- Humidity(humidity)
 }
 
-// Calculate the average humidity in the building. Returns false if there is not enough data available.
-func (h HumidityHandler) average() (Humidity, bool) {
-	var sum Humidity = 0
-	nRooms := 0
-	for room, record := range h.rooms {
-		c := make(chan Humidity)
-		record.getRecent <- c
-		if humidity, ok := <-c; ok {
-			sum += humidity
-			nRooms++
-		} else {
-			log.Printf("Warning: no humidity for room '%s'\n", room)
-		}
-	}
-	if nRooms == 0 {
-		log.Println("Warning: not enough data to calculate average humidity")
-		return -1.0, false
-	}
-	return sum / Humidity(nRooms), true
-}
-
 // Parse the value associated with each key in the query string. Returns a map of
 // keys and values, or error if one of the keys is missing or if there is no value
 // associated with one of the keys.
diff --git a/server/server.go b/server/server.go
index 31d53f4..7d5e977 100644
--- a/server/server.go
+++ b/server/server.go
@@ -8,7 +8,7 @@ import (
 
 const addr = ":9090"
 
-var rooms = []RoomID{
+var roomIDs = []RoomID{
 	"SNbeEcs7XVWMEvjeEYgwZnp9XYjToVhh",
 	"rEKKa5TW5xjArmR25wT4Uiw7tksk4noE",
 }
@@ -16,10 +16,11 @@ var rooms = []RoomID{
 type RoomID string
 
 func main() {
-	humidityHandler := newHumidityHandler(rooms)
-	defer humidityHandler.Close()
+	building := newBuilding(roomIDs)
+	defer building.Close()
 
-	http.Handle("/humidity", humidityHandler)
+	http.Handle("/", DashboardHandler{building})
+	http.Handle("/humidity", HumidityHandler{building})
 	http.Handle("/target_humidity", new(TargetHumidityHandler))
 	http.Handle("/duty_cycle", new(DutyCycleHandler))
author	Sam Anthony <sam@samanthony.xyz>	2024-11-21 16:47:08 -0500
committer	Sam Anthony <sam@samanthony.xyz>	2024-11-21 16:47:08 -0500
commit	dbc71139a5708b371ffb0b7580f562674707c558 (patch)
tree	1ee13dbfa44588a723a0d1fdf4eb24f5d76a9158 /server
parent	a464e144485f69fd9ae6efee3e3fe5e00590e6de (diff)
download	soen422-dbc71139a5708b371ffb0b7580f562674707c558.zip