Smart filters examples

[lumib95]

Hi everyone,

I have been searching in google and in the issues section but with no luck.
We do not use a schema registry and our data messages are in json format.

i tried this #1868 but with no luck.

[Haarolean]

Hey, thanks for reaching out.

We still haven't done any documentation on smart filters but we're planning to (#1865).

Right now, you can refer to this:

variables bind to groovy context: partition, timestampMs, keyAsText, valueAsText, header, key (json if possible), value (json if possible)

json parsing logic:
for key and value if they can be parsed to json they bound as json objects, if not - bound as null

sample scripts:

1. keyAsText != null && keyAsText ~"([Gg])roovy" - regex on key as a string
2. value.name == 'iliax' && value.age > 30 - when value is json
3. value == null && valueAsText != null - search for values that are not null and are not json
4. headers.sentBy == 'some system' && headers['sentAt'] == '2020-01-01'
5. multiline filters also allowed:

def name = value.name  
def age = value.age
name == 'iliax' && age == 30