add function to caller

logger.go

@@ -1864,7 +1864,7 @@ func (e *Entry) caller(n int, pc uintptr, fullpath bool) {
 		return
 	}
 
-	file, line := pcFileLine(pc)
+	file, line, name := pcFileLineName(pc)
 	if !fullpath {
 		var i, j int
 		for i = len(file) - 1; i >= 0; i-- {
@@ -1883,9 +1883,17 @@ func (e *Entry) caller(n int, pc uintptr, fullpath bool) {
 			}
 			file = file[i+1:]
 		}
+		for i = len(name) - 1; i >= 0; i-- {
+			if name[i] == '/' {
+				name = name[i+1:]
+				break
+			}
+		}
 	}
 
 	e.buf = append(e.buf, ",\"caller\":\""...)
+	e.buf = append(e.buf, name...)
+	e.buf = append(e.buf, ':')
 	e.buf = append(e.buf, file...)
 	e.buf = append(e.buf, ':')
 	e.buf = strconv.AppendInt(e.buf, int64(line), 10)