feat(gateway): added first implement of the Gateway (MQTT, Influx, REST)

Signed-off-by: Klagarge <remi@heredero.ch>

gateway/src/RequestInflux.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	_ "github.com/eclipse/paho.mqtt.golang"
+	"github.com/gin-gonic/gin"
+	"github.com/labstack/gommon/log"
+	"golang.org/x/net/context"
+	"net/http"
+	"os"
+)
+
+// swagger:model
+// @Description Example response for Garage Door status
+type GarageDoorExample struct {
+	// example: true
+	IsClosed bool `json:"IsClosed"`
+	// example: false
+	IsDownButtonPressed bool `json:"IsDownButtonPressed"`
+	// example: false
+	IsIRSensor bool `json:"IsIRSensor"`
+	// example: false
+	IsOpen bool `json:"IsOpen"`
+	// example: false
+	IsUpButtonPressed bool `json:"IsUpButtonPressed"`
+}
+
+// @Summary Request Influx data
+// @Description Request data from InfluxDB for a specific device in a room
+// @Tags request
+// @Accept json
+// @Produce json
+// @Security BasicAuth
+// @Param room query string true "Room name" example(Garage)
+// @Param device query string true "Device name" example(Door)
+// @Success 200 {object} GarageDoorExample "Returns a map of field names to their latest values."
+// @Failure 500 {object} gin.H
+// @Router /raclette [get]
+func (gh *Gateway) requestInflux(c *gin.Context) error {
+	// Get the user from the authenticated context
+	user := c.MustGet(gin.AuthUserKey).(string)
+
+	// Get room and device from the query parameters
+	room, ret := c.GetQuery("room")
+	if !ret {
+		return errors.New(`no room found`)
+	}
+	device, ret := c.GetQuery("device")
+	if !ret {
+		return errors.New(`no device found`)
+	}
+
+	org := user
+	bucket := user
+
+	queryAPI := gh.influx.QueryAPI(org)
+	MEASUREMENT_NAME, ok := os.LookupEnv("MEASUREMENT_NAME")
+	if !ok {
+		log.Error("MEASUREMENT_NAME not set, using default value: softweng")
+		MEASUREMENT_NAME = "softweng"
+	}
+	// The Flux query uses a large range (-1000d) and aggregates the latest values.
+	// This ensures we always get the most recent data, even if the database contains old entries.
+	query := fmt.Sprintf(`from(bucket: %q)
+				|> range(start: -1000d)
+ 				|> filter(fn: (r) => r["_measurement"] == %q)
+				|> filter(fn: (r) => r["room"] == %q)
+				|> filter(fn: (r) => r["device"] == %q)
+				|> aggregateWindow(every: 1000d, fn: last, createEmpty: false)
+				`, bucket, MEASUREMENT_NAME, room, device)
+	results, err := queryAPI.Query(context.Background(), query)
+	if err != nil {
+		log.Fatal(err)
+	}
+	values := make(map[string]interface{})
+	for results.Next() {
+		record := results.Record()
+		field := record.Field()
+		value := record.Value()
+		values[field] = value
+		fmt.Println(results.Record())
+	}
+	if err := results.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	c.JSON(http.StatusOK, values)
+	return nil
+}