implement openweather main

cmd/openweather/main.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"runtime/debug"
+	"strconv"
+
+	"github.com/go-co-op/gocron/v2"
+	"github.com/joho/godotenv"
+	"github.com/neatflowcv/seven-skies/internal/pkg/openweather"
+)
+
+func version() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+
+	return info.Main.Version
+}
+
+func main() {
+	godotenv.Load()
+
+	key := os.Getenv("OPENWEATHER_API_KEY")
+	if key == "" {
+		log.Panic("OPENWEATHER_API_KEY is not set")
+	}
+
+	lat := os.Getenv("OPENWEATHER_LAT")
+	if lat == "" {
+		log.Panic("OPENWEATHER_LAT is not set")
+	}
+
+	lon := os.Getenv("OPENWEATHER_LON")
+	if lon == "" {
+		log.Panic("OPENWEATHER_LON is not set")
+	}
+
+	log.Println("version", version())
+
+	scheduler, err := gocron.NewScheduler()
+	if err != nil {
+		log.Panic("error in create scheduler", err)
+	}
+
+	defer func() {
+		err := scheduler.Shutdown()
+		if err != nil {
+			log.Println("error in shutdown scheduler", err)
+		}
+	}()
+
+	latFloat, err := strconv.ParseFloat(lat, 64)
+	if err != nil {
+		log.Panic("error in parse lat", err)
+	}
+
+	lonFloat, err := strconv.ParseFloat(lon, 64)
+	if err != nil {
+		log.Panic("error in parse lon", err)
+	}
+
+	err = Task(key, latFloat, lonFloat)
+	if err != nil {
+		log.Panic("error in task", err)
+	}
+
+	job, err := scheduler.NewJob(
+		gocron.CronJob("5 */2 * * *", false), // openweather에서 2시간마다 데이터가 업데이트 된다.
+		// 5분을 준 이유는 업데이트가 바로 된다는 보장이 없어서
+		gocron.NewTask(
+			Task,
+			key,
+			latFloat,
+			lonFloat,
+		),
+	)
+	if err != nil {
+		log.Panic("error in create job", err)
+	}
+
+	scheduler.Start()
+
+	nextRun, err := job.NextRun()
+	if err != nil {
+		log.Panic("error in get next run", err)
+	}
+	log.Println("next run", nextRun)
+
+	select {}
+}
+
+func Task(key string, lat float64, lon float64) error {
+	log.Println("get forecast")
+	forecast, err := openweather.Forecast(context.Background(), key, lat, lon)
+	if err != nil {
+		log.Println("error in get forecast", err)
+		return err
+	}
+
+	log.Println("get forecast successfully", forecast)
+
+	return nil
+}