python 监控日志并发送邮件报警

#!/usr/bin/env python
#coding:utf8
import re
import os
import time
import smtplib
import socket
import fcntl
import struct
from email.mime.text import MIMEText
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915,  # SIOCGIFADDR
struct.pack('256s', ifname[:15])
)[20:24])

def sendemail(subject,msg,fromemail,emailpasswd,toemail):
'''实现发送邮件功能函数'''
_user = fromemail
_pwd  = emailpasswd
_to   = toemail
nowtime = time.strftime('%Y-%m-%d %H:%M:%S')

msg = MIMEText(msg,format,'utf-8')
if not isinstance(subject,unicode):
subject = unicode(subject)
msg["Subject"] = subject
msg["From"]    = _user
msg["To"]      = ",".join(_to)
msg["Accept-Language"]="zh-CN"
msg["Accept-Charset"]="ISO-8859-1,utf-8"

try:
s = smtplib.SMTP_SSL('smtp.qq.com', 465)
s.login(_user, _pwd)
s.sendmail(_user, _to, msg.as_string())
s.quit()
print "[%s]INFO:Email send Success!" % nowtime
except smtplib.SMTPException,e:
print "[%s]ERROR:Email send Falied,%s" % (nowtime,e)
def matchkeyword(pattern,alertlogfile):
'''实现匹配关键字函数'''
re.compile(pattern)
posfile = "/tmp/posfile"
if not os.path.exists(posfile):
os.mknod(posfile)
if not os.path.getsize(posfile):
with open(posfile,'w') as fobj:
fobj.write('0')
#打开文件
f = open(alertlogfile,'r')
#移动到文件结尾
f.seek(0,2)
#读出文件所在的字节位置
endpos = f.tell()
#移动到文件的开头
with open(posfile,'r') as fobj:
startpos = int(fobj.read())
f.seek(startpos)

if endpos-startpos > 0:
data = f.read(endpos-startpos)
f.close()
with open(posfile,'w') as fobj:
fobj.write(str(endpos))
m = re.findall(pattern, data,re.IGNORECASE)
if m:
content = '\n'.join(m)
return content
else:
return ''

if __name__ == '__main__':
local_ip = get_ip_address('eth0')
subject = '服务器[%s]日志报警了！' % local_ip
fromemail = 'xxxxxxxx@qq.com'
#emailpasswd为QQ邮箱的授权码
emailpasswd = 'mdkuasfhnjbrbhdj'
toemail = ['xxxxxx@qq.com','yyy@qq.com']
alertlogfile = "/data/mysql/mysql_3306/log/error.log"
#pattern = ".*\[Warning\].*\s|.*\[Note\].*\s"
pattern = ".*Warning.*\s|.*error.*\s"
while True:
content = matchkeyword(pattern, alertlogfile)
if content:
sendemail(subject, content, fromemail, emailpasswd, toemail)