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。

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 relog_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 causejava.lang.NullPointerExceptionat java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469) ~[?:1.8.0_202]at java.util.TreeMap.put(TreeMap.java:552) ~[?:1.8.0_202]\'\'\',\'\'\'2021-10-18 09:22:55,222:WARN kafka-async-consumer-2 (FeignClientsErrorDecoder.java:43) - read Exception failed!com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-inputat [Source: java.io.InputStreamReader@743333a3; line: 1, column: 0]at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270) ~[jackson-databind-2.8.4.jar!/:2.8.4]\'\'\',\'\'\'2021-10-18 09:22:52,975:ERROR [,] parallel-2 (AccessLogWebFilter.java:60) - [accessId=616ccc49ff642e00010a4e8c] 发生网关内部错误org.springframework.web.server.ResponseStatusException: 504 GATEWAY_TIMEOUT "Response took longer than timeout: PT35S"; nested exception is org.springframework.cloud.gateway.support.TimeoutException: Response took longer than timeout: PT35Sat org.springframework.cloud.gateway.filter.NettyRoutingFilter.lambda$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: PT35Sat\'\'\',\'\'\'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 emptyat 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$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:748)Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Query was emptyat java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)... 70 more\'\'\',\'\'\'2021-10-17 18:39:33,066:ERROR http-nio-10062-exec-34 TID: 962118fb93d345bc92af98499ad0f771.3235.16344671730621817 (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 causeException: 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-10030-exec-2 TID: ed41cdfb8d5d4953a713285802c56032.80.16345201436864709 (DicountAssembler.java:266) - 查询商品类优惠结果失败:DiscountProductRequest(companyId=IYl6MgdkiG9KoBMYUJo, userLoginId=5c385563ad996c47bf5f7ccd, provinceGeoId=CN-43, cityGeoId=284)feign.FeignException: status 500 reading DiscountProductClient#listDiscountProducts(DiscountProductRequest); content:{"timestamp":1634520143844,"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:616cca245cc0a90001ead690, message:{"jsonMessageType":"com.cmall.ec.cloud.scheduletask.values.kafka.command.DistributedDelayCommand","id":"616cca24d52d1d00010531dd","usage":"EVENT","service":"schedule-task-service","topic":"prod-quote-command-delay","timeStamp":1634519588985,"delayTimes":16983,"producerTaskId":"B21101807668","inquiryId":"B21101807668","resolveBatchId":"616cca019cf7b70001c35477","resolveIds":["616cca00d52d1d000138be9a"],"type":"AUTO","retryCount":2,"producer":"DistributedDelayCommand"}, cause:java.lang.reflect.InvocationTargetExceptionat 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 \'616cca225cc0a90001e1d0d2\' for key \'PRIMARY\'### The error may involve defaultParameterMap### The error occurred while setting parameters### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry \'616cca225cc0a90001e1d0d2\' for key \'PRIMARY\'; SQL []; Duplicate entry \'616cca225cc0a90001e1d0d2\' for key \'PRIMARY\'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry \'616cca225cc0a90001e1d0d2\' 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 exceptionjava.lang.OutOfMemoryError: Java heap space\'\'\',\'\'\'2021-10-16 14:37:19,951:ERROR DiscoveryClient-1 (TimedSupervisorTask.java:79) - task supervisor threw an exceptionjava.lang.OutOfMemoryError: Java heap spaceat\'\'\',\'\'\'2021-10-23 14:03:00,785:ERROR kafka-async-consumer-1 (ConsumeSupport.java:104) - kafka消费失败, cid:6173a593f90d4200010ce3fe, message:{"jsonMessageType":"com.cmall.ec.cloud.events.order.OrderSent","id":"6173a593cb769e0001402a3b","usage":"EVENT","service":"orders-service","topic":"prod-order","timeStamp":1634968979938,"orderId":"S2110230001835","shipmentType":"LOGISTICS","logisticsCompany":"快送","shipmentNum":"","shipGroupId":"6173a59355c35d00014c390c","remark":"","productStoreId":"SZQD0001","userLoginId":"5e0aa6649cf5260001336437","username":"许庆杰","items":[{"productId":"00001","quantity":1}],"isLogisticsFeePayOnLine":true}, cause:java.lang.reflect.InvocationTargetExceptionat 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. Causeat com.baomidou.mybatisplus.service.impl.ServiceImpl.insertBatch(ServiceImpl.java:137)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)... 9 moreCaused 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 \'SF2110230005145\' 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 \'SF2110230005145\' for key \'PRIMARY\'at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)... 51 moreCaused 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 \'SF2110230005145\' for key \'PRIMARY\'at java.lang.reflect.Method.invoke(Method.java:498)... 52 moreCaused by: java.sql.BatchUpdateException: Duplicate entry \'SF2110230005145\' for key \'PRIMARY\'at sun.reflect.GeneratedConstructorAccessor1540.newInstance(Unknown Source)... 61 moreCaused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry \'SF2110230005145\' 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-10011-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 = 0for 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 = 1breakif 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=5c385563ad996c47bf5f7ccd, provinceGeoId=CN-43, cityGeoId=284)\', \'feign.FeignException\', \': status 500 reading DiscountProductClient#listDiscountProducts(DiscountProductRequest); content:\\n{"timestamp":1634520143844,"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 \'616cca225cc0a90001e1d0d2\' 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 \'616cca225cc0a90001e1d0d2\' for key \'PRIMARY\'\\n; SQL []; Duplicate entry \'616cca225cc0a90001e1d0d2\' for key \'PRIMARY\'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry \'616cca225cc0a90001e1d0d2\' 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 \'SF2110230005145\' 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\', \'\')