Cloud Function with pubsub trigger topic is not working - google-cloud-platform

Question

I have wrote a simple code to print data and context from a pubsub trigger cloud function.
def main(event, context):
"""Background Cloud Function to be triggered by Pub/Sub.
Args:
event (dict): The dictionary with data specific to this type of
event. The data field contains the PubsubMessage message. The
attributes field will contain custom attributes if there are any.
context (google.cloud.functions.Context): The Cloud Functions event
metadata. The event_id field contains the Pub/Sub message ID. The
timestamp field contains the publish time.
"""
import base64
print("""This Function was triggered by messageId {} published at {}
""".format(context.event_id, context.timestamp))
if 'data' in event:
name = base64.b64decode(event['data']).decode('utf-8')
else:
name = 'World'
print('Hello {}!'.format(name))
Cloud function is deployed successfully but whenever I publish a message to the trigger topic in logs I cannot see any function execution statement.
I have already verified that I am calling main function only and publishing to a right pubsub topic.
I cannot see any error statement so I am not able to debug.
Any Suggestion will be helpful

Answer 1

I tested your code function in python 3.8 runtime and all works fine, are you using the same pub/sub topic for push new messages?
This the code that I used on my computer to send pubsub messages.
from google.cloud import pubsub_v1
publisher = pubsub_v1.PublisherClient()
# The `topic_path` method creates a fully qualified identifier
# in the form `projects/{project_id}/topics/{topic_id}`
topic_path = publisher.topic_path("myprojectID", "test")
for n in range(1, 10):
data = u"Message number {}".format(n)
# Data must be a bytestring
data = data.encode("utf-8")
# When you publish a message, the client returns a future.
future = publisher.publish(topic_path, data=data)
print(future.result())
print("Published messages.")
requirements.txt
google-cloud-pubsub
This is full function code
import base64
def hello_pubsub(event, context):
print("""This Function was triggered by messageId {} published at {}
""".format(context.event_id, context.timestamp))
if 'data' in event:
name = base64.b64decode(event['data']).decode('utf-8')
else:
name = 'World'
print('Hello {}!'.format(name))
Expected output
This Function was triggered by messageId 1449686821351887 published at 2020-08-20T21:26:30.600Z
The logs may appears with a delay of 10-30 secs on stackdriver