Hi, I wanted to get feedback about the upcoming Python Pubsub API. It is currently experimental and only supports reading and writing UTF-8 strings. My current proposal only concerns reading from Pubsub.
Classes: - PubsubMessage: encapsulates Pubsub message payload and attributes. PTransforms: - ReadMessagesFromPubSub: Outputs elements of type ``PubsubMessage``. - ReadPayloadsFromPubSub: Outputs elements of type ``str``. - ReadStringsFromPubSub: Outputs elements of type ``unicode``, decoded from UTF-8. Description of common PTransform arguments: topic: Cloud Pub/Sub topic in the form "projects/<project>/topics/<topic>". If provided, subscription must be None. subscription: Existing Cloud Pub/Sub subscription to use in the form "projects/<project>/subscriptions/<subscription>". If not specified, a temporary subscription will be created from the specified topic. If provided, topic must be None. id_label: The attribute on incoming Pub/Sub messages to use as a unique record identifier. When specified, the value of this attribute (which can be any string that uniquely identifies the record) will be used for deduplication of messages. If not provided, we cannot guarantee that no duplicate data will be delivered on the Pub/Sub stream. In this case, deduplication of the stream will be strictly best effort. timestamp_attribute: Message value to use as element timestamp. If None, uses message publishing time as the timestamp. Timestamp values should be in one of two formats: - A numerical value representing the number of milliseconds since the Unix epoch. - A string in RFC 3339 format. For example, {@code 2015-10-29T23:41:41.123Z}. The sub-second component of the timestamp is optional, and digits beyond the first three (i.e., time units smaller than milliseconds) will be ignored. Code: https://github.com/udim/beam/blob/b981dd618e9e1f667597eec2a91c7265a389c405/sdks/python/apache_beam/io/gcp/pubsub.py PR: https://github.com/apache/beam/pull/4901
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