add Metric

internal/services/api/handler_metrics.go

@@ -0,0 +1,13 @@
+package api
+
+import (
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"thuanle.me/ip-info/internal/services/db_updater"
+)
+
+func HandleMetrics(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{
+		"updated_at": db_updater.DbUpdatedAt.UnixMilli(),
+	})
+}

internal/services/api/main.go

@@ -24,6 +24,7 @@ func StartApiService() {
 
 	engine.GET("/", HandleIp)
 	engine.GET("/json", HandleJson)
+	engine.GET("/metrics", HandleMetrics)
 
 	port := os.Getenv(key.EnvApiPort)
 	if len(port) == 0 {

internal/services/db_updater/main.go

@@ -5,8 +5,11 @@ import (
 	"github.com/rs/zerolog/log"
 	"thuanle.me/ip-info/configs"
 	"thuanle.me/ip-info/internal/data"
+	"time"
 )
 
+var DbUpdatedAt time.Time
+
 func StartUpdateDbService() {
 	c := cron.New()
 	_, _ = c.AddFunc("@daily", fetchDbs)
@@ -29,5 +32,7 @@ func fetchDbs() {
 			log.Err(err).Msg("Failed to reload mmdb")
 			return
 		}
+
+		DbUpdatedAt = time.Now()
 	}
 }