LLD Discovery

[focar]

Hello all

I'm creating a discovery template for some device. I have an issue which keeps returning "Cannot find the "data" array in the received JSON object"
All items tests show correct output. Could this be a bug or am i to blame here. Any feedback would be appreciated.




The template item:






Discovery Rule







The confusion i have here is that the error shows "data" but i'm requesting the "access_token" data field.

For sake i already tried to preprocess replace the access_token to data but this did not help either.


Many thanks for taking a look at this and provide some feedback

[kyus]

Hey!

Can you explain what your item is supposed to do?
The item that failed is dependent on your HTTP item?
If I understood your setup correctly, it seems like the only value received by your item is the token itself...

[focar]

Hi Kyus

Thanks for your reply

In essence the item should return a token that i can use as a macro for other items that need Oauth2 authentication. Indeed, the discovery item is a dependent from an item that exists in the template.

[focar]

Hey

Maybe worth mentioning. Another way of trying to achieve my goal was to create an item that populates a host inventory field. This works well but this macro {INVENTORY.ALIAS} is not allowed (or does not work) for use in Items.... .

[kyus]

You can store this token in a LLD Macro in your "something.token.set" discovery rule. Then you can use the LLD Macro in Item Prototypes.

[focar]

Hi kuys

That is the reason for opening this topic. It does not work when i try to LLD this: it gives me this output:





thx

[kyus]

Can you show the configuration of the item that is returning the error? Since it is a dependent item, what is it's master item... If you want to fetch data with it using the token, you should be using a different item type, probably HTTP...

[focar]

Master item:

Name: Token Bearer Fetch
Type: HTTP agent
Key: api.token.fetch
Type: text
URL: https://{HOST.IP}/management/v1/oauth2/token
Request Type: POST
Request Body: JSON data
{
"grantType": "password",
"userId": "zabbix",
"password": "password",
"scope": "..."
}
Interval 2h

This works as i receive the info:





Discovery rule:
Name: Set Bearer Token
Type: Dependant Item
Key: api.token.set
Master Item: Token Bearer Fetch

LLD: {#EXTOKEN} --> $.access_token


Gives me this:

[kyus]

Oh, so the error is in the discovery rule. Well, this looks like $.access_token isn't extracting the value of the received JSON, you could try:

$..access_token

but the expression really depends on the format of the received JSON.

[focar]

yeah, already tried different JSONpaths... no worky.

i'll see how i can move forward in this.

thanks for your feedback.