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make_publisher.py
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make_publisher.py
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from typing import AsyncIterator, Mapping, Optional, MutableMapping
from google.cloud.pubsublite.admin_client import make_admin_client
from google.cloud.pubsublite.endpoints import regional_endpoint
from google.cloud.pubsublite.internal.wire.default_routing_policy import DefaultRoutingPolicy
from google.cloud.pubsublite.internal.wire.gapic_connection import GapicConnectionFactory
from google.cloud.pubsublite.internal.wire.merge_metadata import merge_metadata
from google.cloud.pubsublite.internal.wire.publisher import Publisher
from google.cloud.pubsublite.internal.wire.routing_publisher import RoutingPublisher
from google.cloud.pubsublite.internal.wire.single_partition_publisher import SinglePartitionPublisher
from google.cloud.pubsublite.partition import Partition
from google.cloud.pubsublite.paths import TopicPath
from google.cloud.pubsublite.routing_metadata import topic_routing_metadata
from google.cloud.pubsublite_v1 import InitialPublishRequest, PublishRequest
from google.cloud.pubsublite_v1.services.publisher_service import async_client
from google.api_core.client_options import ClientOptions
from google.auth.credentials import Credentials
def make_publisher(
topic: TopicPath,
batching_delay_secs: Optional[float] = None,
credentials: Optional[Credentials] = None,
client_options: Optional[ClientOptions] = None,
metadata: Optional[Mapping[str, str]] = None) -> Publisher:
"""
Make a new publisher for the given topic.
Args:
topic: The topic to publish to.
batching_delay_secs: The delay in seconds to batch messages. The default is reasonable for most cases.
credentials: The credentials to use to connect. GOOGLE_DEFAULT_CREDENTIALS is used if None.
client_options: Other options to pass to the client. Note that if you pass any you must set api_endpoint.
metadata: Additional metadata to send with the RPC.
Returns:
A new Publisher.
Throws:
GoogleApiCallException on any error determining topic structure.
"""
batching_delay_secs = batching_delay_secs if batching_delay_secs is not None else .05
admin_client = make_admin_client(region=topic.location.region, credentials=credentials, client_options=client_options)
if client_options is None:
client_options = ClientOptions(api_endpoint=regional_endpoint(topic.location.region))
client = async_client.PublisherServiceAsyncClient(
credentials=credentials, client_options=client_options) # type: ignore
clients: MutableMapping[Partition, Publisher] = {}
partition_count = admin_client.get_topic_partition_count(topic)
for partition in range(partition_count):
partition = Partition(partition)
def connection_factory(requests: AsyncIterator[PublishRequest]):
final_metadata = merge_metadata(metadata, topic_routing_metadata(topic, partition))
return client.publish(requests, metadata=list(final_metadata.items()))
clients[partition] = SinglePartitionPublisher(InitialPublishRequest(topic=str(topic), partition=partition.value),
batching_delay_secs, GapicConnectionFactory(connection_factory))
return RoutingPublisher(DefaultRoutingPolicy(partition_count), clients)