From 4e55b06016f254947a21b3de3eb93392c0b627dc Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 7 Nov 2024 18:33:17 -0500
Subject: server: handle /duty_cycle

---
 Makefile         |  7 ++++++-
 server/Makefile  | 10 ----------
 server/server.go | 28 ++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 11 deletions(-)
 delete mode 100644 server/Makefile

diff --git a/Makefile b/Makefile
index 089a0f4..91b6c05 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 SENSOR_SRC = SensorStation/SensorStation.ino
 HVAC_SRC = HvacStation/HvacStation.ino
+SERVER_SRC = server/server.go server/record.go
 
 BOARD = esp32:esp32:lilygo_t_display
 PORT = /dev/ttyACM0
@@ -7,7 +8,11 @@ PORT = /dev/ttyACM0
 CFLAGS = -b ${BOARD}
 UPLOADFLAGS = -p ${PORT} ${CFLAGS}
 
-all: SensorStation/build HvacStation/build
+all: SensorStation/build HvacStation/build server/server
+
+server/server: ${SERVER_SRC}
+	go build -o $@ $^
+	gofmt -l -s -w $^
 
 SensorStation/build: ${SENSOR_SRC}
 	arduino-cli compile ${CFLAGS} SensorStation
diff --git a/server/Makefile b/server/Makefile
deleted file mode 100644
index 8954492..0000000
--- a/server/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-SRC = server.go record.go
-
-server: ${SRC}
-	go build $^
-
-fmt:
-	gofmt -l -s -w ${SRC}
-
-clean:
-	rm -f server
diff --git a/server/server.go b/server/server.go
index a658a00..88bfaa3 100644
--- a/server/server.go
+++ b/server/server.go
@@ -18,6 +18,7 @@ var rooms = []RoomID{
 
 type Humidity float32
 type RoomID string
+type DutyCycle float32
 
 type HumidityHandler struct {
 	rooms map[RoomID]Record[Humidity]
@@ -28,12 +29,19 @@ type TargetHumidityHandler struct {
 	target Humidity
 }
 
+type DutyCycleHandler struct {
+	mu sync.Mutex
+	dc DutyCycle
+}
+
 func main() {
 	humidityHandler := newHumidityHandler(rooms)
 	defer humidityHandler.Close()
 
 	http.Handle("/humidity", humidityHandler)
 	http.Handle("/target_humidity", new(TargetHumidityHandler))
+	http.Handle("/duty_cycle", new(DutyCycleHandler))
+
 	fmt.Printf("Listening on %s...\n", addr)
 	log.Fatal(http.ListenAndServe(addr, nil))
 }
@@ -150,6 +158,26 @@ func (h *TargetHumidityHandler) post(w http.ResponseWriter, r *http.Request) {
 	h.target = Humidity(target)
 }
 
+func (h *DutyCycleHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Println(r.Method, r.URL)
+
+	if r.Method != http.MethodPost {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		fmt.Fprintf(w, "invalid method: '%s'", r.Method)
+		return
+	}
+
+	dc, err := strconv.ParseFloat(r.URL.RawQuery, 32)
+	if err != nil {
+		badRequest(w, "invalid duty cycle: '%s'", r.URL.RawQuery)
+		return
+	}
+
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	h.dc = DutyCycle(dc)
+}
+
 // 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.
-- 
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