pubsub: Remove cloudevents dependency#707
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The pinned cloudevents 2.0.0 no longer provides the cloudevents.http module, so api/pubsub.py and api/pubsub_mongo.py fail to import and the API cannot start. Instead of migrating to the new cloudevents v2 API, drop the library: it was only used to fill in the "id", "time" and "specversion" attributes and serialize the event to JSON. Add a small to_cloudevent_json() helper that emits the exact same CloudEvents 1.0 JSON envelope (verified byte-identical against cloudevents 1.12.1 output for dict data, string data and extension attributes such as "owner"), so the wire format consumed by external subscribers is unchanged. Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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The pinned cloudevents 2.0.0 no longer provides the cloudevents.http module, so api/pubsub.py and api/pubsub_mongo.py fail to import and the API cannot start. Instead of migrating to the new cloudevents v2 API, drop the library: it was only used to fill in the "id", "time" and "specversion" attributes and serialize the event to JSON.
Add a small to_cloudevent_json() helper that emits the exact same CloudEvents 1.0 JSON envelope (verified byte-identical against cloudevents 1.12.1 output for dict data, string data and extension attributes such as "owner"), so the wire format consumed by external subscribers is unchanged.