下面为大家分享一篇python 日志增量抓取实现方法，具有很好的参考价值，希望对大家有所帮助。一起过来看看吧
实例如下所示：
import time
import pickle
import os
import re
class LogIncScaner(object):
def __init__(self,log_file, reg_ex,seek_file='/tmp/log-inc-scan.seek.temp'):
self.log_file = log_file
self.reg_ex = reg_ex
self.seek_file = seek_file
def scan(self):
seek = self._get_seek()
file_mtime = os.path.getmtime(self.log_file)
if file_mtime <= seek['time']:
print 'file mtime not change since last scan'
seek['time'] = file_mtime
self._dump_seek(seek)
return []
file_size = os.path.getsize(self.log_file)
if file_size <= seek['position']:
print 'file size not change since last scan'
seek['position'] = file_size
self._dump_seek(seek)
return []
print 'file changed,start to scan'
matchs = []
with open(self.log_file, 'rb') as logfd:
logfd.seek(seek['position'],os.SEEK_SET)
for match in re.finditer(self.reg_ex, logfd.read()):
matchs.append(match)
seek = {'time':time.time(),'position': logfd.tell()}
print seek
self._dump_seek(seek)
return matchs
def _get_seek(self):
seek = {'time':time.time(),'position':0}
if os.path.exists(self.seek_file):
with open(self.seek_file,'rb') as seekfd:
try:
seek = pickle.load(seekfd)
except:
pass
print seek
return seek
def _dump_seek(self, seek):
with open(self.seek_file,'wb') as seekfd:
pickle.dump(seek,seekfd)
def reset_seek(self):
self._dump_seek({'time':time.time(),'position':0})
if __name__ == "__main__":
scaner = LogIncScaner('/var/log/messages',r'(\w+ \d+ \d+:\d+:\d+) .+?exception')
scaner.reset_seek()
while True:
matchs = scaner.scan()
for match in matchs:
print 'fond at:' + match.group(1) + ' content:' + match.group(0)
time.sleep(5)
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