VD & incorrect json response

[10der 832]

hi

 

I have VD with periodic polling internet resource

sometimes response from a resource invalid. my VD throw an exception in json.decode and stopped

so, my question is - how to catch exceptions from http and prevent to stop VD main loop?

 

notice: response, status, errorCode - all OK and status - 200

Edited May 20, 2017 by 10der

[pos 22]

Can you print returned data? What is the returned data size of it when ok and when not ok?

 

/Peo

[Sankotronic 2,370]

Hi @10der,

 

One of the ways is to parse received data and check if there is structure missing. Since you didn't provide any structure here is what I use to check data returned from Netatmo weather station:

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Above function is called from code after getting response:

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Of course this code is from scene, but it should also work in VD.

 

if there is only one part that is missing from table sometimes, like for example rain participation from weather forecast then you can check by comparing with nil:

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I thank to @petergebruers for above solutions that he kindly shared!

 

[10der 832]

@Sankotronic you are a monster!  thank you so much.

a crazzzy solution as for me
 

[Sankotronic 2,370]

I hope that it will help.

 

There is one more solution if nothing else helps. I had also problems with WU weather rain participation data. It is not nil neither empty string or anything recognizable by normal comparison. I haven't try to use conversion from code to char, but at the end this helped, at least i think it helped since code didn't stop since:

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This one I still need to analyze when it happens again except if @petergebruers or someone else has answer to it.

 

 

[Sankotronic 2,370]

Hi @10der,

 

Here is one more way how to check in VD if you get in response json table or some scrambled and unwanted data that json.decode can't process and stops with error:

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Using pcall (protected call) function prevents debugger from stopping code and returns false result and message if there is error. In above case if response does not contain table data.