python实时分析日志的一个小脚本分享

#!/usr/bin/env python#coding: utf-8from __future__ import divisionimport osLOG_FILE = '/data0/logs/nginx/xxxx-access_log'POSITION_FILE = '/tmp/position.log'STATUS_FILE = '/tmp/http_status'#crontab 执行时间CRON_TIME = 300def get_position(): #第一次读取日志文件，POSITION_FILE为空 if not os.path.exists(POSITION_FILE):  start_position = str(0)  end_position = str(os.path.getsize(LOG_FILE))  fh = open(POSITION_FILE,'w')  fh.write('start_position: %s/n' % start_position)  fh.write('end_position: %s/n' % end_position)  fh.close()  os._exit(1) else:  fh = open(POSITION_FILE)  se = fh.readlines()  fh.close()  #其他意外情况导致POSITION_FILE内容不是两行  if len(se) != 2:   os.remove(POSITION_FILE)   os._exit(1)  last_start_position,last_end_position = [item.split(':')[1].strip() for item in se]  start_position = last_end_position  end_position = str(os.path.getsize(LOG_FILE))  #日志轮转导致start_position > end_position  #print start_position,end_position  if start_position > end_position:   start_position = 0  #日志停止滚动时  elif start_position == end_position:   os._exit(1)  #print start_position,end_position  fh = open(POSITION_FILE,'w')  fh.write('start_position: %s/n' % start_position)  fh.write('end_position: %s/n' % end_position)  fh.close()  return map(int,[start_position,end_position])def write_status(content): fh = open(STATUS_FILE,'w') fh.write(content) fh.close()def handle_log(start_position,end_position): log = open(LOG_FILE) log.seek(start_position,0) status_2xx,status_403,status_404,status_500,status_502,status_503,status_504,status_all,rt,bandwidth = 0,0,0,0,0,0,0,0,0,0 while True:  current_position = log.tell()  if current_position >= end_position:   break  line = log.readline()  line = line.split(' ')  host,request_time,time_local,status,bytes_sent = line[1],line[3],line[5],line[10],line[11]  #print host,request_time,time_local,status,bytes_sent  status_all += 1  try:   rt += float(request_time.strip('s'))   bandwidth += int(bytes_sent)  except:   pass  if status == '200' or status == '206':   status_2xx += 1  elif status == '403':   status_403 += 1  elif status == '404':   status_404 += 1  elif status == '500':   status_500 += 1  elif status == '502':   status_502 += 1  elif status == '503':   status_503 += 1  elif status == '504':   status_504 += 1 log.close() #print "status_2xx: %s/nstatus_403: %s/nstatus_404: %s/nstatus_500: %s/nstatus_502: %s/nstatus_503: %s/nstatus_504: %s/nstatus_all: %s/nrt: %s/nbandwidth: %s/n" % (status_2xx/CRON_TIME,status_403/CRON_TIME,status_404/CRON_TIME,status_500/CRON_TIME,status_502/CRON_TIME,status_503/CRON_TIME,status_504/CRON_TIME,status_all/CRON_TIME,rt/status_all,bandwidth/CRON_TIME) write_status("status_2xx: %s/nstatus_403: %s/nstatus_404: %s/nstatus_500: %s/nstatus_502: %s/nstatus_503: %s/nstatus_504: %s/nstatus_all: %s/nrt: %s/nbandwidth: %s/n" % (status_2xx/CRON_TIME,status_403/CRON_TIME,status_404/CRON_TIME,status_500/CRON_TIME,status_502/CRON_TIME,status_503/CRON_TIME,status_504/CRON_TIME,status_all/CRON_TIME,rt/status_all,bandwidth/CRON_TIME))if __name__ == '__main__': start_position,end_position = get_position() handle_log(start_position,end_position)

cat /tmp/http_statusstatus_2xx: 17.3333333333status_403: 0.0status_404: 1.0status_500: 0.0status_502: 0.0status_503: 0.0status_504: 0.0status_all: 20.0rt: 0.0782833333333bandwidth: 204032.0

In [5]: '99772400' > '100227572'Out[5]: TrueIn [6]: int('99772400') > int('100227572')Out[6]: False

#日志轮转导致start_position > end_position#print start_position,end_positionif int(start_position) > int(end_position): start_position = 0#日志停止滚动时elif int(start_position) == int(end_position): os._exit(1)