Add logger file

file/filelib.go

@@ -0,0 +1,73 @@
+package file
+
+import "fmt"
+import "os"
+
+
+func GetFilePointer (LogFileName string) (*os.File){
+
+    if FileExists (LogFileName) == false {
+    	fp, err := CreateFile (LogFileName)
+    	if err != nil {
+    		fmt.Printf("Error to creata file '%s' , err: '%s'\n", LogFileName, err)
+    		return nil
+    	}
+    	return fp
+    }
+
+	fp, err := OpenFile (LogFileName)
+	if err != nil {
+		fmt.Printf("Error to open file '%s' , err: '%s'\n", LogFileName, err)
+		return nil
+	}
+
+    return fp
+
+}
+
+func FileExists(name string) bool {
+    if _, err := os.Stat(name); err != nil {
+       if os.IsNotExist(err) {
+            return false
+        }
+    }
+    return true
+}
+
+func CreateFile(name string) (*os.File, error) {
+    fo, err := os.Create(name)
+    if err != nil {
+        return nil, err
+    }
+    defer func() {
+        fo.Close()
+    }()
+    return fo, nil
+}
+
+func OpenFile(filename string) (*os.File, error) {
+	f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, 0600)
+	if err != nil {
+	    return nil, err
+	}
+
+	defer func() {
+		f.Close()
+	}()
+
+	return f, nil
+}
+
+func OpenCreateFile(filename string) (*os.File) {
+	f, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	if err != nil {
+		fmt.Printf("Error to open/create file '%s' , err: '%s'\n", filename, err)
+	    return nil
+	}
+
+	defer func() {
+		//f.Close()
+	}()
+
+	return f
+}