add storage API

api/storage.go

@@ -0,0 +1,38 @@
+package api
+
+import (
+	"fmt"
+	"syscall"
+
+	"github.com/gin-gonic/gin"
+)
+
+// @Summary Get Storage Utilization
+// @Description Get disk free information of aptly storage
+// @Tags Status
+// @Produce json
+// @Success 200 {object} string "usage information"
+// @Failure 400 {object} Error "Internal Error"
+// @Router /api/storage [get]
+func apiDiskFree(c *gin.Context) {
+	var df struct {
+		Total       uint64
+		Free        uint64
+		PercentUsed float32
+	}
+
+	fs := context.Config().GetRootDir()
+
+	var stat syscall.Statfs_t
+	err := syscall.Statfs(fs, &stat)
+	if err != nil {
+		AbortWithJSONError(c, 400, fmt.Errorf("Error getting storage info on %s: %s", fs, err))
+		return
+	}
+
+	df.Total = uint64(stat.Blocks) * uint64(stat.Bsize) / 1048576
+	df.Free = uint64(stat.Bavail) * uint64(stat.Bsize) / 1048576
+	df.PercentUsed = 100.0 - float32(stat.Bavail)/float32(stat.Blocks)*100.0
+
+	c.JSON(200, df)
+}