Add ifIndex support

net/net.go

@@ -26,6 +26,7 @@ type IOCountersStat struct {
 	Dropout     uint64 `json:"dropout"`     // total number of outgoing packets which were dropped (always 0 on OSX and BSD)
 	Fifoin      uint64 `json:"fifoin"`      // total number of FIFO buffers errors while receiving
 	Fifoout     uint64 `json:"fifoout"`     // total number of FIFO buffers errors while sending
+
 }
 
 // Addr is implemented compatibility to psutil
@@ -121,7 +122,6 @@ func InterfacesWithContext(ctx context.Context) ([]InterfaceStat, error) {
 	for _, ifi := range is {
 
 		var flags []string
-
 		if ifi.Flags&net.FlagUp != 0 {
 			flags = append(flags, "up")
 		}