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Python 正则表达式实战之Java日志解析
需求描述
基于生产监控告警需求，需要对Java日志进行解析，提取相关信息，作为告警通知消息的内容部分。
创新互联于2013年开始，先为霍山等服务建站，霍山等地企业，进行企业商务咨询服务。为霍山企业网站制作PC+手机+微官网三网同步一站式服务解决您的所有建站问题。
提取思路
具体怎么提取，提取哪些内容呢？这里笔者分析了大量不同形态的生产日志，最后总结出4种形态，如下，制定出以下提取逻辑。
形态1
上图中，款选部分即为要提取的主要内容，即异常发生时所在文件，代码行，自定义异常相关描述，异常类型，异常描述，这里提取的相关说明和异常描述将统一作为异常的详细描述
形态2
类似形态1，如果没有独占一行的“异常类型”，那就取最后Caused by:后面的异常类型，及其描述
形态3
形态1，形态2不匹配的情况下，匹配形态3，该形态中，异常类型和描述是包含在自定义异常相关描述里面的
形态4
前三者都不匹配的情况下，匹配最后这种形态。没有异常类型，仅日志级别“ERROR”可以标识它是条异常日志。
代码实现
#!/usr/bin/env python
#-*- coding:utf-8 -*-
import re
log_list = [
'''
2021-10-18 09:22:41,079:ERROR http-nio-9330-exec-4 (DirectJDKLog.java:181) - Servlet.service() for servlet [dispatcherServlet] in context with path [/finance] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469) ~[?:1.8.0_202]
at java.util.TreeMap.put(TreeMap.java:552) ~[?:1.8.0_202]
''',
'''
2021-10-18 09:22:55,222:WARN kafka-async-consumer-2 (FeignClientsErrorDecoder.java:43) - read Exception failed!
com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
at [Source: java.io.InputStreamReader@a3; line: 1, column: 0]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270) ~[jackson-databind-2.8.4.jar!/:2.8.4]
''',
'''
2021-10-18 09:22:52,975:ERROR [,] parallel-2 (AccessLogWebFilter.java:60) - [accessId=616ccc49ff642e00010a4e8c] 发生网关内部错误
org.springframework.web.server.ResponseStatusException: 504 GATEWAY_TIMEOUT "Response took longer than timeout: PT35S"; nested exception is org.springframework.cloud.gateway.support.TimeoutException: Response took longer than timeout: PT35S
at org.springframework.cloud.gateway.filter.NettyRoutingFilter.lambda$filter$5(NettyRoutingFilter.java:211) ~[spring-cloud-gateway-core-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_202]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
Caused by: org.springframework.cloud.gateway.support.TimeoutException: Response took longer than timeout: PT35S
at
''',
'''
2021-10-18 09:22:41,905:WARN http-nio-8080-exec-60 (VehicleOeImpl.java:1000) - 批量更新第三方价格失败1---->
org.springframework.jdbc.BadSqlGrammarException:
### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty
### The error may involve com.cmall.ec.webapp.maindata.web.dao.vehicleOe.ThirdPartyOeMapper.updateList-Inline
### The error may involve com.cmall.ec.webapp.maindata.web.dao.vehicleOe.ThirdPartyOeMapper.updateList-Inline
### The error occurred while setting parameters
### SQL:
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:91)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
... 70 more
''',
'''
2021-10-17 18:39:33,066:ERROR http-nio--exec-34 TID: fb93d345bc92afad0f771.3235. (DirectJDKLog.java:181) - Servlet.service() for servlet [dispatcherServlet] in context with path [/orders/seller] threw exception [Request processing failed; nested exception is com.cmall.commons.service.exception.HttpMessageException: [400]标名为空] with root cause
Exception: 标名为空
at com.cmall.commons.utils.Assert.fail(Assert.java:553) ~[icec-cloud-commons-0.4.5.jar!/:?]
at com.cmall.commons.utils.Assert.notBlank(Assert.java:112) ~[icec-cloud-commons-0.4.5.jar!/:?]
''',
'''
2021-10-18 09:22:23,849:ERROR http-nio--exec-2 TID: ed41cdfb8d5d4953ac.80. (DicountAssembler.java:266) - 查询商品类优惠结果失败:DiscountProductRequest(companyId=IYl6MgdkiG9KoBMYUJo, userLoginId=5cad996c47bf5f7ccd, provinceGeoId=CN-43, cityGeoId=284)
feign.FeignException: status 500 reading DiscountProductClient#listDiscountProducts(DiscountProductRequest); content:
{"timestamp":,"status":500,"error":"Internal Server Error","exception":"com.cmall.commons.service.exception.HttpMessageException","message":"优惠前的不含税价格不能为空","path":"/discountPromotion/listDiscountProducts"}
at feign.FeignException.errorStatus(FeignException.java:62) ~[feign-core-9.3.1.jar!/:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
''',
'''2021-10-18 09:22:23,849:ERROR [-] (DicountAssembler.java:266) - task supervisor threw an exception ....''',
'''
2021-10-18 09:13:13,940:ERROR kafka-async-consumer-9 (ConsumeSupport.java:104) - kafka消费失败, cid:616cca245cc0aead690, message:{"jsonMessageType":"com.cmall.ec.cloud.scheduletask.values.kafka.command.DistributedDelayCommand","id":"616cca24d52d1d000dd","usage":"EVENT","service":"schedule-task-service","topic":"prod-quote-command-delay","timeStamp":,"delayTimes":,"producerTaskId":"B","inquiryId":"B","resolveBatchId":"616cca019cf7bc","resolveIds":["616cca00d52d1d000138be9a"],"type":"AUTO","retryCount":2,"producer":"DistributedDelayCommand"}, cause:java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor4946.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.cmall.messagebus.exception.MessageBaseException: 系统自动报价失败-->org.springframework.dao.DuplicateKeyException:
### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'
; SQL []; Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'
at com.cmall.ec.cloud.quotation.handler.QuotationAllocationHandler.intelligentAutoQuoteDispatcher(QuotationAllocationHandler.java:80)
... 9 more
''',
'''
2021-10-16 14:37:19,951:ERROR DiscoveryClient-1 (TimedSupervisorTask.java:79) - task supervisor threw an exception
java.lang.OutOfMemoryError: Java heap space
''',
'''2021-10-16 14:37:19,951:ERROR DiscoveryClient-1 (TimedSupervisorTask.java:79) - task supervisor threw an exception
java.lang.OutOfMemoryError: Java heap space
at''',
'''
2021-10-23 14:03:00,785:ERROR kafka-async-consumer-1 (ConsumeSupport.java:104) - kafka消费失败, cid:6173a593f90dce3fe, message:{"jsonMessageType":"com.cmall.ec.cloud.events.order.OrderSent","id":"6173a593cb769e0001402a3b","usage":"EVENT","service":"orders-service","topic":"prod-order","timeStamp":,"orderId":"S","shipmentType":"LOGISTICS","logisticsCompany":"快送","shipmentNum":"","shipGroupId":"6173ac35d00014c390c","remark":"","productStoreId":"SZQD0001","userLoginId":"5e0aa6649cf","username":"许庆杰","items":[{"productId":"00001","quantity":1}],"isLogisticsFeePayOnLine":true}, cause:java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor1909.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.baomidou.mybatisplus.exceptions.MybatisPlusException: Error: Cannot execute insertBatch Method. Cause
at com.baomidou.mybatisplus.service.impl.ServiceImpl.insertBatch(ServiceImpl.java:137)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
... 9 more
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error flushing statements. Cause: org.apache.ibatis.executor.BatchExecutorException: com.cmall.ec.cloud.service.dao.mapper.ShipFeeMapper.insert (batch index #1) failed. Cause: java.sql.BatchUpdateException: Duplicate entry 'SF' for key 'PRIMARY'
### Cause: org.apache.ibatis.executor.BatchExecutorException: com.cmall.ec.cloud.service.dao.mapper.ShipFeeMapper.insert (batch index #1) failed. Cause: java.sql.BatchUpdateException: Duplicate entry 'SF' for key 'PRIMARY'
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
... 51 more
Caused by: org.apache.ibatis.executor.BatchExecutorException: com.cmall.ec.cloud.service.dao.mapper.ShipFeeMapper.insert (batch index #1) failed. Cause: java.sql.BatchUpdateException: Duplicate entry 'SF' for key 'PRIMARY'
at java.lang.reflect.Method.invoke(Method.java:498)
... 52 more
Caused by: java.sql.BatchUpdateException: Duplicate entry 'SF' for key 'PRIMARY'
at sun.reflect.GeneratedConstructorAccessor1540.newInstance(Unknown Source)
... 61 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'SF' for key 'PRIMARY'
at sun.reflect.GeneratedConstructorAccessor1537.newInstance(Unknown Source)
... 71 more
''',
'''
2021-10-25 16:29:15,853:ERROR reactor-http-epoll-3 (CompositeLog.java:122) - 500 Server Error for HTTP POST "/job-service/api/registry"
reactor.netty.http.client.PrematureCloseException: Connection prematurely closed BEFORE response
''',
'''2021-11-06 07:09:04,781:WARN http-nio--exec-85 (AdminService.java:97) - 任务执行失败, code:500, reason:java.lang.OutOfMemoryError: Java heap space''',
'''2022-01-08 13:46:30,668:ERROR http-nio-9524-exec-5 (WaitSettleDealServiceImpl.java:147) - 添加退订单到账单失败com.cmall.commons.service.exception.HttpMessageException: [411]退货单添加失败，该分组已经结束对账，无法添加退货单'''
]
exception_match_pattern_list = [
':(ERROR|WARN) .+\s\(([^\s]+?\.java):(\d+)\)(.*)\n([^:\s>\u4e00-\u9fa5]*Exception|[^:\s>\u4e00-\u9fa5]*Error)(.*?)(\s+at\s|$)',
':(ERROR|WARN) .+\s\(([^\s]+?\.java):(\d+)\).*([^\n]*Caused by: )([^:\s>]*?Exception|[^:\s]*?Error)(.*?)(\s+at\s*|$)',
':(ERROR|WARN) .+\s\(([^\s]+?\.java):(\d+)\)([^\n]*?)([^:\s>\u4e00-\u9fa5]*Exception|[^:\s>\u4e00-\u9fa5]*Error)([^\n]*?)(\s+at\s|$)',
':(ERROR|WARN) .+\s\(([^\s]+?\.java):(\d+)\)(.*?)\n*?\s*?([^:\s>\u4e00-\u9fa5]*Exception|[^:\s>\u4e00-\u9fa5]*Error)*?(.*?)(\s+at\s|$)'
]
for log_index, log in enumerate(log_list):
flag = 0
for pattern_index, flag_pattern in enumerate(exception_match_pattern_list):
match_result = re.findall(flag_pattern, log, re.DOTALL)
if match_result:
print('匹配第%s个Pattern' % (pattern_index+1), '匹配结果：', match_result[0])
flag = 1
break
if not flag:
print('第%s条日志，不匹配任何正则表达式' % (log_index + 1))
提取效果
匹配第1个Pattern 匹配结果： ('ERROR', 'DirectJDKLog.java', '181', ' - Servlet.service() for servlet [dispatcherServlet] in context with path [/finance] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause', 'java.lang.NullPointerException', '', '\n\tat ')
匹配第1个Pattern 匹配结果： ('WARN', 'FeignClientsErrorDecoder.java', '43', ' - read Exception failed!', 'com.fasterxml.jackson.databind.JsonMappingException', ': No content to map due to end-of-input', '\n at ')
匹配第1个Pattern 匹配结果： ('ERROR', 'AccessLogWebFilter.java', '60', ' - [accessId=616ccc49ff642e00010a4e8c] 发生网关内部错误', 'org.springframework.web.server.ResponseStatusException', ': 504 GATEWAY_TIMEOUT "Response took longer than timeout: PT35S"; nested exception is org.springframework.cloud.gateway.support.TimeoutException: Response took longer than timeout: PT35S', '\n\tat ')
匹配第1个Pattern 匹配结果： ('WARN', 'VehicleOeImpl.java', '1000', ' - 批量更新第三方价格失败1---->', 'org.springframework.jdbc.BadSqlGrammarException', ':\n### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty\n### The error may involve com.cmall.ec.webapp.maindata.web.dao.vehicleOe.ThirdPartyOeMapper.updateList-Inline\n### The error may involve com.cmall.ec.webapp.maindata.web.dao.vehicleOe.ThirdPartyOeMapper.updateList-Inline\n### The error occurred while setting parameters\n### SQL:\n### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty\n; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was empty', '\n\tat ')
匹配第1个Pattern 匹配结果： ('ERROR', 'DirectJDKLog.java', '181', ' - Servlet.service() for servlet [dispatcherServlet] in context with path [/orders/seller] threw exception [Request processing failed; nested exception is com.cmall.commons.service.exception.HttpMessageException: [400]标名为空] with root cause', 'Exception', ': 标名为空', '\n\tat ')
匹配第1个Pattern 匹配结果： ('ERROR', 'DicountAssembler.java', '266', ' - 查询商品类优惠结果失败:DiscountProductRequest(companyId=IYl6MgdkiG9KoBMYUJo, userLoginId=5cad996c47bf5f7ccd, provinceGeoId=CN-43, cityGeoId=284)', 'feign.FeignException', ': status 500 reading DiscountProductClient#listDiscountProducts(DiscountProductRequest); content:\n{"timestamp":,"status":500,"error":"Internal Server Error","exception":"com.cmall.commons.service.exception.HttpMessageException","message":"优惠前的不含税价格不能为空","path":"/discountPromotion/listDiscountProducts"}', '\n\tat ')
匹配第4个Pattern 匹配结果： ('ERROR', 'DicountAssembler.java', '266', '', '', ' - task supervisor threw an exception ....', '')
匹配第2个Pattern 匹配结果： ('ERROR', 'ConsumeSupport.java', '104', 'Caused by: ', 'com.cmall.messagebus.exception.MessageBaseException', ": 系统自动报价失败-->org.springframework.dao.DuplicateKeyException:\n### Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'\n### The error may involve defaultParameterMap\n### The error occurred while setting parameters\n### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'\n; SQL []; Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '616cca225cc0ae1d0d2' for key 'PRIMARY'", '\n\tat ')
匹配第1个Pattern 匹配结果： ('ERROR', 'TimedSupervisorTask.java', '79', ' - task supervisor threw an exception', 'java.lang.OutOfMemoryError', ': Java heap space', '')
匹配第1个Pattern 匹配结果： ('ERROR', 'TimedSupervisorTask.java', '79', ' - task supervisor threw an exception', 'java.lang.OutOfMemoryError', ': Java heap space\nat', '')
匹配第2个Pattern 匹配结果： ('ERROR', 'ConsumeSupport.java', '104', 'Caused by: ', 'com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException', ": Duplicate entry 'SF' for key 'PRIMARY'", '\n\tat ')
匹配第1个Pattern 匹配结果： ('ERROR', 'CompositeLog.java', '122', ' - 500 Server Error for HTTP POST "/job-service/api/registry"', 'reactor.netty.http.client.PrematureCloseException', ': Connection prematurely closed BEFORE response', '')
匹配第3个Pattern 匹配结果： ('WARN', 'AdminService.java', '97', ' - 任务执行失败, code:500, reason:', 'java.lang.OutOfMemoryError', ': Java heap space', '')
匹配第3个Pattern 匹配结果： ('ERROR', 'WaitSettleDealServiceImpl.java', '147', ' - 添加退订单到账单失败', 'com.cmall.commons.service.exception.HttpMessageException', ': [411]退货单添加失败，该分组已经结束对账，无法添加退货单', '')
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