now polling backend only: prevent completely read of big files first time (after start of service), initial seek to start time using half-interval search algorithm (see issue #795):

disabled for gamin and pyinotify backends;

fail2ban/server/filtergamin.py

@@ -76,7 +76,7 @@ class FilterGamin(FileFilter):
 		TODO -- RF:
 		this is a common logic and must be shared/provided by FileFilter
 		"""
-		self.getFailures(path, MyTime.time() - self.getFindTime())
+		self.getFailures(path)
 		try:
 			while True:
 				ticket = self.failManager.toBan()

fail2ban/server/filterpoll.py

@@ -55,6 +55,7 @@ class FilterPoll(FileFilter):
 		## The time of the last modification of the file.
 		self.__prevStats = dict()
 		self.__file404Cnt = dict()
+		self.__initial = dict()
 		logSys.debug("Created FilterPoll")
 
 	##
@@ -83,7 +84,6 @@ class FilterPoll(FileFilter):
 	# @return True when the thread exits nicely
 
 	def run(self):
-		cntr = 0
 		while self.active:
 			if logSys.getEffectiveLevel() <= 6:
 				logSys.log(6, "Woke up idle=%s with %d files monitored",
@@ -93,8 +93,11 @@ class FilterPoll(FileFilter):
 				for container in self.getLogPath():
 					filename = container.getFileName()
 					if self.isModified(filename):
-						self.getFailures(filename, (MyTime.time() - self.getFindTime()) if not cntr else None)
+						# set start time as now - find time for first usage only (prevent performance bug with polling of big files)
-						cntr += 1
+						self.getFailures(filename, 
+							(MyTime.time() - self.getFindTime()) if not self.__initial.get(filename) else None
+						)
+						self.__initial[filename] = True
 						self.__modified = True
 
 				if self.__modified:

fail2ban/server/filterpyinotify.py

@@ -102,7 +102,7 @@ class FilterPyinotify(FileFilter):
 		TODO -- RF:
 		this is a common logic and must be shared/provided by FileFilter
 		"""
-		self.getFailures(path, MyTime.time() - self.getFindTime())
+		self.getFailures(path)
 		try:
 			while True:
 				ticket = self.failManager.toBan()