server: humidity record for each room

1 files changed, 80 insertions, 0 deletions

diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..2795890
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,80 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+)
+
+const addr = ":9090"
+var rooms = []RoomID {
+	",4AL[+V*:*k*n{7vL{}/d=K#Mo*y*^.@",
+	"Jq!+<p3g-iu%-vU]FZp2H,AKZWp@!4![",
+}
+
+type Humidity float32
+type RoomID string
+
+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()
+	}
+}
+
+func (h HumidityHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Println(r.Method, r.URL)
+	switch r.Method {
+	case http.MethodGet:
+		h.get(w, r)
+	case http.MethodPost:
+		h.post(w, r)
+	default:
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		fmt.Fprintf(w, "invalid method: '%s'", r.Method)
+	}
+}
+
+func (h HumidityHandler) get(w http.ResponseWriter, r *http.Request) {
+	c := make(chan float32)
+	h.humidity.getRecent <- c
+	humidity, ok := <-c
+	if !ok {
+		w.WriteHeader(http.StatusGone)
+		fmt.Fprintf(w, "no humidity data stored on server")
+		return
+	}
+	fmt.Fprintf(w, "%.2f", humidity)
+}
+
+func (h HumidityHandler) post(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.RawQuery
+	humidity, err := strconv.ParseFloat(query, 32)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "invalid query string: '%s'", query)
+		return
+	}
+	h.humidity.put <- float32(humidity)
+}
+
+func main() {
+	humidityHandler := newHumidityHandler()
+	defer humidityHandler.Close()
+
+	http.Handle("/humidity", humidityHandler)
+	fmt.Printf("Listening on %s...\n", addr)
+	log.Fatal(http.ListenAndServe(addr, nil))
+}