boilerplate code

internal/domains/sensors/handlers.go

@@ -0,0 +1,110 @@
+package sensors
+
+import (
+	"encoding/json"
+	"nats-app/internal/iot"
+
+	"github.com/nats-io/nats.go"
+)
+
+const (
+	subjectSensorsRegister  = "sensors.register"
+	subjectSensorsUpdate    = "sensors.update"
+	subjectSensorsGet       = "sensors.get"
+	subjectSensorsValuesGet = "sensors.values.get"
+	subjectSensorsList      = "sensors.list"
+)
+
+type Handlers struct {
+	service *Service
+	*iot.IoTDevice
+}
+
+func NewHandlers(service *Service, iot *iot.IoTDevice) *Handlers {
+	return &Handlers{
+		service:   service,
+		IoTDevice: iot,
+	}
+}
+
+func handleRequest[Req any, Res any](msg *nats.Msg, handler func(Req) (Res, error)) {
+	var req Req
+	if err := json.Unmarshal(msg.Data, &req); err != nil {
+		msg.Respond([]byte(`{"error":"invalid request"}`))
+		return
+	}
+
+	result, err := handler(req)
+	if err != nil {
+		msg.Respond([]byte(`{"error":"` + err.Error() + `"}`))
+		return
+	}
+
+	response, _ := json.Marshal(result)
+	msg.Respond(response)
+}
+
+func (h *Handlers) SetupEndpoints() *Handlers {
+	h.register()
+	h.update()
+	h.get()
+	h.getValues()
+	h.list()
+	return h
+}
+
+func (h *Handlers) register() {
+	h.NATS.Subscribe(subjectSensorsRegister, func(msg *nats.Msg) {
+		handleRequest(msg, func(req Sensor) (Sensor, error) {
+			// service layer
+
+			return req, nil
+		})
+	})
+}
+
+func (h *Handlers) update() {
+	h.NATS.Subscribe(subjectSensorsUpdate, func(msg *nats.Msg) {
+		handleRequest(msg, func(req Sensor) (Sensor, error) {
+			// service layer
+
+			return req, nil
+		})
+	})
+}
+
+func (h *Handlers) get() {
+	h.NATS.Subscribe(subjectSensorsGet, func(msg *nats.Msg) {
+		handleRequest(msg, func(req struct {
+			SensorID string `json:"sensor_id"`
+		}) (Sensor, error) {
+			// service layer
+
+			return Sensor{}, nil
+		})
+	})
+}
+
+func (h *Handlers) getValues() {
+	h.NATS.Subscribe(subjectSensorsValuesGet, func(msg *nats.Msg) {
+		handleRequest(msg, func(req struct {
+			SensorID string `json:"sensor_id"`
+			From     string `json:"from"`
+			To       string `json:"to"`
+		}) ([]SensorData, error) {
+			// service layer
+
+			return []SensorData{}, nil
+		})
+	})
+}
+
+func (h *Handlers) list() {
+	h.NATS.Subscribe(subjectSensorsList, func(msg *nats.Msg) {
+		handleRequest(msg, func(req struct{}) ([]Sensor, error) {
+			// service layer
+
+			return []Sensor{}, nil
+		})
+	})
+}