def update_subscription_with_dead_letter_policy(project_id, topic_id,
subscription_id,
dead_letter_topic_id):
"""Update a subscription's dead letter policy."""
# [START pubsub_dead_letter_update_subscription]
from google.cloud import pubsub_v1
from google.cloud.pubsub_v1.types import DeadLetterPolicy, FieldMask
# TODO(developer)
# project_id = "your-project-id"
# TODO(developer): This is an existing topic that the subscription
# with dead letter policy is attached to.
# topic_id = "your-topic-id"
# TODO(developer): This is an existing subscription with a dead letter policy.
# subscription_id = "your-subscription-id"
# TODO(developer): This is an existing dead letter topic that the subscription
# with dead letter policy will forward dead letter messages to.
# dead_letter_topic_id = "your-dead-letter-topic-id"
publisher = pubsub_v1.PublisherClient()
subscriber = pubsub_v1.SubscriberClient()
topic_path = publisher.topic_path(project_id, topic_id)
subscription_path = subscriber.subscription_path(project_id,
subscription_id)
dead_letter_topic_path = publisher.topic_path(project_id,
dead_letter_topic_id)
subscription_before_update = subscriber.get_subscription(
request={"subscription": subscription_path})
print("Before the update: {}".format(subscription_before_update))
# Indicates which fields in the provided subscription to update.
update_mask = FieldMask(paths=["dead_letter_policy.max_delivery_attempts"])
# Construct a dead letter policy you expect to have after the update.
dead_letter_policy = DeadLetterPolicy(
dead_letter_topic=dead_letter_topic_path, max_delivery_attempts=20)
# Construct the subscription with the dead letter policy you expect to have
# after the update. Here, values in the required fields (name, topic) help
# identify the subscription.
subscription = pubsub_v1.types.Subscription(
name=subscription_path,
topic=topic_path,
dead_letter_policy=dead_letter_policy,
)
with subscriber:
subscription_after_update = subscriber.update_subscription(
request={
"subscription": subscription,
"update_mask": update_mask
})
print("After the update: {}".format(subscription_after_update))
# [END pubsub_dead_letter_update_subscription]
return subscription_after_update
def remove_dead_letter_policy(project_id, topic_id, subscription_id):
"""Remove dead letter policy from a subscription."""
# [START pubsub_dead_letter_remove]
from google.cloud import pubsub_v1
from google.cloud.pubsub_v1.types import FieldMask
# TODO(developer)
# project_id = "your-project-id"
# TODO(developer): This is an existing topic that the subscription
# with dead letter policy is attached to.
# topic_id = "your-topic-id"
# TODO(developer): This is an existing subscription with a dead letter policy.
# subscription_id = "your-subscription-id"
publisher = pubsub_v1.PublisherClient()
subscriber = pubsub_v1.SubscriberClient()
topic_path = publisher.topic_path(project_id, topic_id)
subscription_path = subscriber.subscription_path(project_id,
subscription_id)
subscription_before_update = subscriber.get_subscription(
request={"subscription": subscription_path})
print("Before removing the policy: {}".format(subscription_before_update))
# Indicates which fields in the provided subscription to update.
update_mask = FieldMask(paths=[
"dead_letter_policy.dead_letter_topic",
"dead_letter_policy.max_delivery_attempts",
])
# Construct the subscription (without any dead letter policy) that you
# expect to have after the update.
subscription = pubsub_v1.types.Subscription(name=subscription_path,
topic=topic_path)
with subscriber:
subscription_after_update = subscriber.update_subscription(
request={
"subscription": subscription,
"update_mask": update_mask
})
print("After removing the policy: {}".format(subscription_after_update))
# [END pubsub_dead_letter_remove]
return subscription_after_update
