add tacking

local/utl/tracking/tracking.go

@@ -0,0 +1,24 @@
+package tracking
+
+import (
+	"bufio"
+	"os"
+	"time"
+)
+
+func TailLogFile(path string, callback func(string)) {
+    file, _ := os.Open(path)
+    defer file.Close()
+
+    file.Seek(0, os.SEEK_END) // Start at end of file
+    reader := bufio.NewReader(file)
+
+    for {
+        line, err := reader.ReadString('\n')
+        if err == nil {
+            callback(line)
+        } else {
+            time.Sleep(500 * time.Millisecond) // wait for new data
+        }
+    }
+}