do_log转化¶

使用:

lager:info("handle_call Request = ~p",[Request]),

最本质是调用:

lager:do_log(info,
   [
      {application, mongrel},
      {module, mongrel},
      {function, handle_call},
      {line, 79},
      {pid, pid_to_list(self())},
      {node, node()}
      | lager:md()
    ],
   "handle_call Request= ~p",
   [Request],
   4096,
   4,
   __Leveldemo_lager_server42,
   __Tracesdemo_lager_server42,
   lager_event,
   __Piddemo_lager_server42
);

do_log(Severity, Metadata, Format, Args, Size, SeverityAsInt, LevelThreshold, TraceFilters, Sink, SinkPid)