Read logs of a Storage trigger cloud function

Question

I need to read the status of a storage trigger cloud function, the last line of the log

2021-03-09 15:47:42.908 IST function_name 6cymbohrrv6g Function execution took 11 ms, finished with status: 'ok'

This way I can determine if the function execution was a success or not.

I tried reading the logs using the below script, but it displays all the logs.

    logging_client = logging.Client()
    for entry in logging_client.list_entries():
         timestamp = entry.timestamp.isoformat()
         print("* {}: {}".format(timestamp, entry.payload))

Is there some way I can limit the logs to the current execution? Can I read the last log which displays the status of the function?

Answer 1

You can use and advanced filter in your logging_client.list_entries() method. The official documentation of the Python client library for Stackdriver Logging admits this parameter.

filter (str) – a filter expression. See https://cloud.google.com/logging/docs/view/advanced_filters

For example:

from google.cloud import logging

logging_client = logging.Client()
f = 'resource.type="cloud_function" AND resource.labels.function_name="yourFunctionName" AND textPayload:"Function execution took"'
for entry in logging_client.list_entries(filter_=f):
    print("{} {}".format(entry.labels['execution_id'], entry.payload))

will output:

...
gssssmirx021 Function execution took 20522 ms, finished with status code: 200
gsssn1aibbc5 Function execution took 20022 ms, finished with status code: 200

Notice the substring operator (:) on textPayload:"Function execution took"