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39 lines
1.5 KiB
Plaintext
39 lines
1.5 KiB
Plaintext
// Module included in the following assemblies
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//
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// * serverless/functions/serverless-developing-python-functions.adoc
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:_mod-docs-content-type: REFERENCE
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[id="serverless-python-function-return-values_{context}"]
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= Python function return values
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Functions can return any value supported by link:https://flask.palletsprojects.com/en/1.1.x/quickstart/#about-responses[Flask]. This is because the invocation framework proxies these values directly to the Flask server.
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.Example
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[source,python]
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----
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def main(context: Context):
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body = { "message": "Howdy!" }
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headers = { "content-type": "application/json" }
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return body, 200, headers
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----
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Functions can set both headers and response codes as secondary and tertiary response values from function invocation.
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[id="serverless-python-function-return-values-returning-events_{context}"]
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== Returning CloudEvents
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Developers can use the `@event` decorator to tell the invoker that the function return value must be converted to a CloudEvent before sending the response.
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.Example
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[source,python]
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----
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@event("event_source"="/my/function", "event_type"="my.type")
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def main(context):
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# business logic here
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data = do_something()
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# more data processing
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return data
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----
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This example sends a CloudEvent as the response value, with a type of `"my.type"` and a source of `"/my/function"`. The CloudEvent link:https://github.com/cloudevents/spec/blob/v1.0.1/spec.md#event-data[`data` property] is set to the returned `data` variable. The `event_source` and `event_type` decorator attributes are both optional.
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