Include datapoint value in transform?

[themactech]

themactech [http://community.zenoss.org/people/themactech] created the discussion

"Include datapoint value in transform?"

To view the discussion, visit: http://community.zenoss.org/message/69961#69961

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I have a temperature sensor that sends the exact same trap whether the temperature went above the top threshold or under the low threshold.  I want to differentiate between the two.  Now the trap includes the current temp that set of the trap, and I am getting the top and bottom threshold values via a command datasource (it's not available over SNMP).  I store the Threshold values as TempHigh and TempLow data points within my command datasource, and I add them to the temperature graph.

How can I reference the TempHigh or TempLow data points from my command datasource within my transform so I can compare with the current temp that triggered the trap so I can change the summary to reflect if the top or bottom threshold has been broken?

Here is what I am looking to do in a flowchart way

-Receive trap
     -Transform
          -Put in correct event class
          -Get current temperature that triggered trap  ** this I know how to do
          -If current temp > Top threshold  ** <- this is the value I need to pull and don't know how **
               set summary to : High temperature threshold exceeded with (current temp value)
           else
               set summary to : Low temperature threshold exceeded with (current temp value)


Thanks

Manuel
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[themactech]

themactech [http://community.zenoss.org/people/themactech] created the discussion

"Re: Include datapoint value in transform?"

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Ok I figured out how to pull RRD values, but of all things I am now having an issue with my if statement...

Here is what I have:

LowThresh = float(device.getRRDValue('TempLow'))
HighThresh = float(device.getRRDValue('TempHigh))
CurrentTemp = float(float(getattr(evt, 'internalTemp'))/10)

Now this gives me correct values, LowThresh is 75.0, HighThresh is 80.0 and Current temp will be the current value when the trap is sent, i.e. 86.3  (I have to divide by 10 since it will return 863 for 86.3).

Now I want to determine if I blew the top or bottow threshold, so I do this:

if CurrentTemp > HIghThresh:
    evt.summary = "Current temperature of " + str (CurrentTemp) + " is above the threshold of " + str (HighThresh)
if CurrentTemp < LowThresh:
    evt.summary = "Current temperature of " + str (CurrentTemp) + " is under the threshold of " + str (LowThresh)

however I get an error and zenhub.log says it's a compile error on the 'if CurrentTemp > HIghThresh:" line

Is my syntax wrong?

Thanks

Manuel
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[j053ph4]

j053ph4 [http://community.zenoss.org/people/j053ph4] created the discussion

"Re: Include datapoint value in transform?"

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You may want to try putting a try:...except:  branch in the transform.  Sometimes the RRD data isn't available (for whatever reason), so the initial variables may be defined as "None:
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[themactech]

themactech [http://community.zenoss.org/people/themactech] created the discussion

"Re: Include datapoint value in transform?"

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Thanks for the reply but all my variables are populated.  To test it I removed my if statement and instead just put a this line:

evt.summary = str (LowThresh) + "   " +  str (HighThresh) + "   " + str (CurrentTemp)

I then triggered an event (heat gun) and the event summary did contain the proper 3 values.

It is so frustrating to be stumped by an 'if' statement of all things...

Manuel
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[j053ph4]

j053ph4 [http://community.zenoss.org/people/j053ph4] created the discussion

"Re: Include datapoint value in transform?"

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Well if this is it be sure to smack yourself for me:

if CurrentTemp > H*I*ghThresh:

Looks like your 'if' clause uses a capital "I" instead of lowercase 'i' in your variable definition...

If only i could recover the time i've lost to miskeys and missing semicolons X-(
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[themactech]

themactech [http://community.zenoss.org/people/themactech] created the discussion

"Re: Include datapoint value in transform?"

To view the discussion, visit: http://community.zenoss.org/message/70015#70015

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I got it to work by using the expressions instead of the variables in my "if" statement, so:

if CurrentTemp < LowThresh:

Does not work, but:

if float(float(getattr(evt, 'internalTemp'))/10) > float(device.getRRDValue('TempHigh')):

Does work:

Funny thing is I can use the variables CurrentTemp, HighThresh, LowThresh that I define at the top of my script in my evt.summary definition, but my if statement fails if I try to use them there...

Manuel
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[erlingqiling yu]

erlingqiling yu [http://community.zenoss.org/people/erlingqiling] created the discussion

"Re: Include datapoint value in transform?"

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