如何使用 Python 正则表达式处理 zookeeper 日志文件？

Question

我有如下 Zookeeper 日志：

2019-09-25 11:16:39,253 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception
EndOfStreamException: Unable to read additional data from client sessionid 0x16d666b95e10002, likely client has closed socket
        at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)
        at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
        at java.lang.Thread.run(Thread.java:745)
2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002
2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded

我正在尝试得到以下结果：

log entry 1:
2019-09-25 11:16:39,253 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception
EndOfStreamException: Unable to read additional data from client sessionid 0x16d666b95e10002, likely client has closed socket
        at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)
        at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
        at java.lang.Thread.run(Thread.java:745)

log entry 2:
2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002

log entry 3:
2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002
2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded

我尝试使用以下正则表达式模式：

import re

content = "2019-09-25 11:16:39,253 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception\n \
EndOfStreamException: Unable to read additional data from client sessionid 0x16d666b95e10002, likely client has closed socket\n \
        at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)\n \
        at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)\n \
        at java.lang.Thread.run(Thread.java:745)\n \
2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002\n \
2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded\n \
"

pattern = re.compile("(\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2}:\d{2}.*)+",re.DOTALL|re.MULTILINE)

match = re.match(pattern, content)
for f in match.groups():
    print(f,"\nEND")

但它匹配整个内容：

2019-09-25 11:16:39,253 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception
 EndOfStreamException: Unable to read additional data from client sessionid 0x16d666b95e10002, likely client has closed socket
         at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)
         at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
         at java.lang.Thread.run(Thread.java:745)
 2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002
 2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded

END

有谁知道如何解决这个问题？非常感谢！

Answer 1

你可以试试下面的正则表达式：

\d{4}(?:-\d{2}){2} \d{2}(?::\d{2}){2},\d{3}(?:(?!\d{4}(?:-\d{2}){2} \d{2}(?::\d{2}){2},\d{3})[\s\S])*

Click for Demo

说明：

• \d{4}(?:-\d{2}){2} \d{2}(?::\d{2}){2},\d{3} - 匹配模式 XXXX-XX-XX XX:XX:XX,XXX 的时间戳，其中 X 是一个数字
• (?:(?!\d{4}(?:-\d{2}){2} \d{2}(?::\d{2}){2},\d{3})[\s\S])* - 匹配 0+ 次出现的任何字符，只要它不以上面指针 1 中提到的格式的另一个时间戳开头。

您可以找到working Python 代码here。

Answer 2

这是您正在尝试的工作版本，稍作修改：

content = """2019-09-25 11:16:39,253 [myid:] - WARN  
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception\n \
EndOfStreamException: Unable to read additional data from client sessionid 
0x16d666b95e10002, likely client has closed socket\n \
    at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)\n \
    at 
org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)\n \
    at java.lang.Thread.run(Thread.java:745)\n \
2019-09-25 11:16:39,260 [myid:] - INFO  
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002\n \
2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded\n \
"""

logs = re.findall(r'\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} \[.*?\] - (?:TRACE|DEBUG|INFO|WARN|ERROR).*?(?=\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} \[.*?\] - (?:TRACE|DEBUG|INFO|WARN|ERROR)|$)', content, flags=re.DOTALL)
print(logs)

打印出来：

['2019-09-25 11:16:39,253 [myid:] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception\n EndOfStreamException: Unable to read additional data from client sessionid 0x16d666b95e10002, likely client has closed socket\n         at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)\n         at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)\n         at java.lang.Thread.run(Thread.java:745)\n ',
 '2019-09-25 11:16:39,260 [myid:] - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.101.231:48311 which had sessionid 0x16d666b95e10002\n ',
 '2019-09-25 11:16:40,000 [myid:] - INFO  [SessionTracker:ZooKeeperServer@358] - Expiring session 0x36b63c29fbac528, timeout of 10000ms exceeded\n ']

这里使用的正则表达式逻辑将日志行条目的开头定义为时间戳，后跟破折号和状态之一（即TRACE、DEBUG、INFO、WARN、ERROR） .该模式使用.* 跨行匹配，在全点模式下，直到到达另一个日志条目的开头或输入的结尾。