Eventhub event metadata is None

[joal42]

I followed the example code in Eventhub triggerred Azure function in python. However, I got None for event enqueue time, offset, and etc.

import logging
import azure.functions as func

def main(event: func.EventHubEvent):
    logging.info('Function triggered to process a message: ', event.get_body())
    logging.info('  EnqueuedTimeUtc =', event.enqueued_time)
    logging.info('  SequenceNumber =', event.sequence_number)
    logging.info('  Offset =', event.offset)

EnqueuedTimeUtc, SequenceNumber, Offset are all None.
event.getbody() return the right payload I sent to evetnhub. Do I need to modify the payload I sent to eventhub to get the EnqueuedTimeUtc and other metadata?

[asavaritayal]

@elprans can you investigate this?

[joal42]

@elprans I tried to set "cardinality": "many" and one. Many print offset None. one prints offset but enqueued_time still None. Cloud you help with it? Do I need to modify the data I send to eventhub for using those metadata?

[maiqbal11]

I was able to repro. Will need to take a fix for this in the library code.

EDIT:
Upon further investigation, this appears to only be an issue when cardinality is absent or cardinality is set to one. cardinality set to many is working as expected with offset, sequence number and enqueued time being sent.

[m-chau]

I set my cardinality to many but still cannot see the metadata...

[Hazhzeng]

Yes, I can reproduce this issue from my local devbox.
This is due to the iothub- metadata has been moved into a sub-metadata SystemProperties of function's trigger, which results in the parser is not working correctly.
https://github.com/Azure/azure-functions-python-library/blob/dev/azure/functions/eventhub.py#L134