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Pub/Sub: improve pub.py #2403

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merged 2 commits into from
Sep 17, 2019
Merged

Pub/Sub: improve pub.py #2403

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90820f5
print number of messages published
anguillanneuf Sep 16, 2019
0d2dd94
two nit's
anguillanneuf Sep 17, 2019
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20 changes: 12 additions & 8 deletions pubsub/cloud-client/quickstart/pub.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,13 +22,13 @@
# [END pubsub_quickstart_pub_deps]


def get_callback(api_future, data):
def get_callback(api_future, data, ref):
"""Wrap message data in the context of the callback function."""

def callback(api_future):
try:
print("Published message {} now has message ID {}".format(
data, api_future.result()))
ref["num_messages"] += 1
except Exception:
print("A problem occurred when publishing {}: {}\n".format(
data, api_future.exception()))
Expand All @@ -39,24 +39,28 @@ def callback(api_future):
def pub(project_id, topic_name):
"""Publishes a message to a Pub/Sub topic."""
# [START pubsub_quickstart_pub_client]
# Initialize a Publisher client
# Initialize a Publisher client.
client = pubsub_v1.PublisherClient()
# [END pubsub_quickstart_pub_client]
# Create a fully qualified identifier in the form of
# `projects/{project_id}/topics/{topic_name}`
topic_path = client.topic_path(project_id, topic_name)

# Data sent to Cloud Pub/Sub must be a bytestring
# Data sent to Cloud Pub/Sub must be a bytestring.
data = b"Hello, World!"

# Keep track of the number of published messages.
ref = dict({"num_messages": 0})

# When you publish a message, the client returns a future.
api_future = client.publish(topic_path, data=data)
api_future.add_done_callback(get_callback(api_future, data))
api_future.add_done_callback(get_callback(api_future, data, ref))

# Keep the main thread from exiting until background message
# is processed.
# Keep the main thread from exiting while the message future
# gets resolved in the background.
while api_future.running():
time.sleep(0.1)
time.sleep(0.5)
print("Published {} message(s).".format(ref["num_messages"]))


if __name__ == '__main__':
Expand Down