如何使用 textfsm 解析带有级联元素的 CLI 输出

Question

我正在尝试使用 textfsm & python 解析具有级联元素的 CLI 输出。这是一个例子：参考 - https://github.com/google/textfsm/wiki/TextFSM

使用这个例子。如何获得每个插槽的 'CPU utilization' 的值？

Routing Engine status:
  Slot 0:
    Current state                  Master
    Election priority              Master (default)
    Temperature                 39 degrees C / 102 degrees F
    CPU temperature             55 degrees C / 131 degrees F
    DRAM                      2048 MB
    Memory utilization          76 percent
    CPU utilization:
      User                      95 percent
      Background                 0 percent
      Kernel                     4 percent
      Interrupt                  1 percent
      Idle                       0 percent
    Model                          RE-4.0
    Serial ID                      xxxxxxxxxxxx
    Start time                     2008-04-10 20:32:25 PDT
    Uptime                         180 days, 22 hours, 45 minutes, 20 seconds
    Load averages:                 1 minute   5 minute  15 minute
                                       0.96       1.03       1.03
Routing Engine status:
  Slot 1:
    Current state                  Backup
    Election priority              Backup
    Temperature                 30 degrees C / 86 degrees F
    CPU temperature             31 degrees C / 87 degrees F
    DRAM                      2048 MB
    Memory utilization          14 percent
    CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     0 percent
      Interrupt                  1 percent
      Idle                      99 percent
    Model                          RE-4.0
    Serial ID                      xxxxxxxxxxxx
    Start time                     2008-01-22 07:32:10 PST
    Uptime                         260 days, 10 hours, 45 minutes, 39 seconds

模板

Value Required Slot (\d+)
Value State (\w+)
Value Temp (\d+)
Value CPUTemp (\d+)
Value DRAM (\d+)
Value User (\d+)
Value Background (\d+)
Value Kernel (\d+)
Value Interrupt (\d+)
Value Idle (\d+)
Value Model (\S+)


Start
  ^Routing Engine status: -> Record RESlot
  ^\s+CPU utilization: -> Record SUBRESlot

RESlot
  ^\s+Slot\s+${Slot}
  ^\s+Current state\s+${State}
  ^\s+Temperature\s+${Temp} degrees
  ^\s+CPU temperature\s+${CPUTemp} degrees
  ^\s+DRAM\s+${DRAM} MB
  ^\s+Model\s+${Model} -> Start

SUBRESlot
  ^\s+User\s+${User}\s+percent
  ^\s+backgroud\s+${Background}\s+percent
  ^\s+Kernel\s+${Kernel}\s+percent
  ^\s+Interrupt\s+${Interrupt}\s+percent
  ^\s+Idle\s+${Idle}\s+percent -> Start

输出：

Slot, State, Temp, CPUTemp, DRAM, User, Background, Kernel, Interrupt, Idle, Model
0, Master, 39, 55, 2048, , , , , , RE-4.0
1, Backup, 30, 31, 2048, , , , , , RE-4.0

如您所见，CPU 利用率元素未填充。

非常感谢任何指点

Answer 1

我认为你的模板有两个错误：

你应该记录当你有所有数据。
您在RESlot状态的最后一行试图匹配的Model值只有在您通过输入文本中的CPU利用部分后才能匹配。请注意，textfsm 逐行解析文件。

您可以使用以下模板获取数据：

Value Required Slot (\d+)
Value State (\w+)
Value Temp (\d+)
Value CPUTemp (\d+)
Value DRAM (\d+)
Value User (\d+)
Value Background (\d+)
Value Kernel (\d+)
Value Interrupt (\d+)
Value Idle (\d+)
Value Model (\S+)


Start
  ^Routing Engine status: -> RESlot
  ^\s+CPU utilization: -> SUBRESlot


RESlot
  ^\s+Slot\s+${Slot}
  ^\s+Current state\s+${State}
  ^\s+Temperature\s+${Temp} degrees
  ^\s+CPU temperature\s+${CPUTemp} degrees
  ^\s+DRAM\s+${DRAM} MB -> Start
  

SUBRESlot
  ^\s+User\s+${User}\s+percent
  ^\s+Background\s+${Background}\s+percent
  ^\s+Kernel\s+${Kernel}\s+percent
  ^\s+Interrupt\s+${Interrupt}\s+percent
  ^\s+Idle\s+${Idle}\s+percent -> SUBModel
  
SUBModel
  ^\s+Model\s+${Model} -> Record Start

结果：

Slot, State, Temp, CPUTemp, DRAM, User, Background, Kernel, Interrupt, Idle, Model
0, Master, 39, 55, 2048, 95, 0, 4, 1, 0, RE-4.0
1, Backup, 30, 31, 2048, 0, 0, 0, 1, 99, RE-4.0

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