Hi,
I'm trying to ship a MetaTrader4 server log file on Windows, using nxlog 2.8
and an im_file directive.
The MetaTrader4 log file is weird, since it seems to be terminated with a bunch
of null bytes.
Below is how BareTailPro shows the file.
[cid:image001.png@01D0617C.6731F2B0]
Nxlog will ship the data when the file is first opened, but then seems unable
to detect new data as it is written to the file.
It looks like the length of the log files remains constant, when new data is
written it goes before the NULL bytes and the number of NULL bytes at the end
of the file are adjusted to keep the log file the same size.
[cid:image002.png@01D0617C.6731F2B0]
Nxlog's debug logs show the following around the time some new data is written:
2015-03-18 13:05:46 DEBUG mtime of file
'\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log' changed
2015-03-18 13:05:46 DEBUG nx_event_to_jobqueue: READ (in_file3)
2015-03-18 13:05:46 DEBUG event added to jobqueue
2015-03-18 13:05:46 DEBUG no events or no future events, event thread sleeping
in condwait
2015-03-18 13:05:46 DEBUG worker 1 got signal for new job
2015-03-18 13:05:46 DEBUG opening
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log
2015-03-18 13:05:46 DEBUG worker 1 got no event to process
2015-03-18 13:05:46 DEBUG worker 1 waiting for new event
2015-03-18 13:05:46 DEBUG file
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log opened
2015-03-18 13:05:46 DEBUG non-active modification on
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log
2015-03-18 13:05:46 DEBUG nx_event_to_jobqueue: READ (in_file3)
2015-03-18 13:05:46 DEBUG event added to jobqueue
2015-03-18 13:05:46 DEBUG worker 1 got signal for new job
2015-03-18 13:05:46 DEBUG worker 1 got no event to process
2015-03-18 13:05:46 DEBUG worker 0 processing event 0x20bdea8
2015-03-18 13:05:46 DEBUG new event in event_thread [in_file3:MODULE_SPECIFIC]
2015-03-18 13:05:46 DEBUG PROCESS_EVENT: READ (in_file3)
2015-03-18 13:05:46 DEBUG future event, event thread sleeping 9999000ms in
cond_timedwait
2015-03-18 13:05:46 DEBUG Module in_file3 got EOF from
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log
2015-03-18 13:05:46 DEBUG worker 1 waiting for new event
2015-03-18 13:05:46 DEBUG closing idle file
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log (CloseWhenIdle is enabled)
2015-03-18 13:05:46 DEBUG file
\\MTLIV02\Apps\MetaTrader4Server\logs\20150318.log closed
If I understand the logs correctly, nxlog is detecting that the files
modification time changed, but it can't find any new data since it doesn't know
to look for it before the NULL bytes.
Is there any way to instruct nxlog to ignore the NULL bytes at the end of the
file?
Thanks!
:D<br />
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