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file filter-backends: stability fix for sporadically errors - always close file handle, otherwise may be locked (prevent log-rotate, etc.)

pull/1557/head
sebres 2016-09-09 16:08:28 +02:00
parent 4404642fa3
commit 2108216d33
1 changed files with 37 additions and 38 deletions
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75
fail2ban/server/filter.py
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@ -799,49 +799,48 @@ class FileFilter(Filter):
if log is None:
logSys.error("Unable to get failures in " + filename)
return False
# Try to open log file.
# We should always close log (file), otherwise may be locked (log-rotate, etc.)
try:
has_content = log.open()
# see http://python.org/dev/peps/pep-3151/
except IOError as e:
logSys.error("Unable to open %s" % filename)
logSys.exception(e)
return False
except OSError as e: # pragma: no cover - requires race condition to tigger this
logSys.error("Error opening %s" % filename)
logSys.exception(e)
return False
except Exception as e: # pragma: no cover - Requires implemention error in FileContainer to generate
logSys.error("Internal error in FileContainer open method - please report as a bug to https://github.com/fail2ban/fail2ban/issues")
logSys.exception(e)
return False
# seek to find time for first usage only (prevent performance decline with polling of big files)
if self.__autoSeek.get(filename):
startTime = self.__autoSeek[filename]
del self.__autoSeek[filename]
# prevent completely read of big files first time (after start of service),
# initial seek to start time using half-interval search algorithm:
# Try to open log file.
try:
self.seekToTime(log, startTime)
except Exception as e: # pragma: no cover
logSys.error("Error during seek to start time in \"%s\"", filename)
raise
has_content = log.open()
# see http://python.org/dev/peps/pep-3151/
except IOError as e:
logSys.error("Unable to open %s" % filename)
logSys.exception(e)
return False
except OSError as e: # pragma: no cover - requires race condition to tigger this
logSys.error("Error opening %s" % filename)
logSys.exception(e)
return False
except Exception as e: # pragma: no cover - Requires implemention error in FileContainer to generate
logSys.error("Internal error in FileContainer open method - please report as a bug to https://github.com/fail2ban/fail2ban/issues")
logSys.exception(e)
return False
# yoh: has_content is just a bool, so do not expect it to
# change -- loop is exited upon break, and is not entered at
# all if upon container opening that one was empty. If we
# start reading tested to be empty container -- race condition
# might occur leading at least to tests failures.
while has_content:
line = log.readline()
if not line or not self.active:
# The jail reached the bottom or has been stopped
break
self.processLineAndAdd(line)
log.close()
# seek to find time for first usage only (prevent performance decline with polling of big files)
if self.__autoSeek.get(filename):
startTime = self.__autoSeek[filename]
del self.__autoSeek[filename]
# prevent completely read of big files first time (after start of service),
# initial seek to start time using half-interval search algorithm:
try:
self.seekToTime(log, startTime)
except Exception as e: # pragma: no cover
logSys.error("Error during seek to start time in \"%s\"", filename)
raise
logSys.exception(e)
return False
if has_content:
while not self.idle:
line = log.readline()
if not line or not self.active:
# The jail reached the bottom or has been stopped
break
self.processLineAndAdd(line)
finally:
log.close()
db = self.jail.database
if db is not None:
db.updateLog(self.jail, log)