解析CSV格式日志

正常形式的CSV格式日志

• 原始日志

  _program_:access
  _severity_:6
  _priority_:14
  _facility_:1
  topic:syslog-forwarder
  content:10.64.10.20|10/Jun/2019:11:32:16 +0800|m.zf.cn|GET /css/mip-base.css HTTP/1.1|200|0.077|6404|10.11.186.82:8001|200|0.060|https://yz.m.sm.cn/s?q=%25%24%23%40%21&from=wy878378&uc_param_str=dnntnwvepffrgibijbprsvdsei|-|Mozilla/5.0 (Linux; Android 9; HWI-AL00 Build/HUAWEIHWI-A00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36|-|-

• 需求

  1. 当_program_字段值为access时，对字段content做一次PSV（pipe分隔的解析），然后丢弃content字段。

  2. 将request: GET /css/mip-base.css HTTP/1.1字段拆分为request_method、http_version以及request。

  3. 对http_referer做URL解码。

• 解决方案

  1. 如果_program_字段值是access，则通过parse-csv函数解析content内容，并删除原始字段content，语句如下：

     * | where _program_='access' | parse-csv -delim='|' content as remote_addr,time_local,host,request,status,request_time,body_bytes_sent,upstream_addr,upstream_status,upstream_response_time,http_referer,http_x_forwarded_for,http_user_agent,session_id,guid | project-away content

     返回的日志为：

     __source__:  1.2.3.4
     __tag__:__client_ip__:  2.3.X.X
     __tag__:__receive_time__:  1562845168
     __topic__:
     _facility_:  1
     _priority_:  14
     _program_:  access
     _severity_:  6
     body_bytes_sent:  6404
     guid:  -
     host:  m.zf.cn
     http_referer:  https://yz.m.sm.cn/s?q=%25%24%23%40%21&from=wy878378&uc_param_str=dnntnwvepffrgibijbprsvdsei
     http_user_agent:  Mozilla/5.0 (Linux; Android 9; HWI-AL00 Build/HUAWEIHWI-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36
     http_x_forwarded_for:  -
     remote_addr:  10.64.10.20
     request: GET /css/mip-base.css HTTP/1.1
     request_time:  0.077
     session_id:  -
     status:  200
     time_local:  10/Jun/2019:11:32:16 +0800
     topic:  syslog-forwarder
     upstream_addr:  10.11.186.82:8001
     upstream_response_time:  0.060
     upstream_status:  200

  2. 使用parse-regexp函数将request字段解析成request_method、request、http_version。

     * | parse-regexp request, '(\S+)' as request_method |  parse-regexp request, '\S+\s+\S+\s+(\S+)' as http_version | parse-regexp request, '\S+\s+(\S+)' as request

     返回的日志为：

     request:  /css/mip-base.css
     request_method:  GET
     http_version:  HTTP/1.1

  3. 对http_referer做URL解码。

     * | extend http_referer=url_decode(http_referer)

     返回的日志为：

     http_referer:https://yz.m.sm.cn/s?q=%$#@!&from=wy878378&uc_param_str=dnntnwvepffrgibijbprsvdsei

非正常形式的CSV格式日志