How to parse CLI output with cascading elements using textfsm - parsing

Question

I am trying to parse CLI output that has cascading elements using textfsm & python. Here is an example: Ref - https://github.com/google/textfsm/wiki/TextFSM
Using this example. How can I get the value of 'CPU utilization' for each Slot ?
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
Template
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
Output:
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
As you can see the CPU utilization elements are not getting populated.
I would really appreciate any pointer

Answer 1

I consider there are two mistakes in your template:
You should Record when you have all data.
The Model value you are trying to match in the last line of RESlot state can be matched only after you passed the CPU utilization section in the input text. Please note that textfsm parses the file line by line.
You can use below template to get your data:
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
Result:
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