SIP: CloudEvents HTTP for spin SDK #398
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Signed-off-by: Jiaxiao Zhou <[email protected]>
Mossaka
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Related to #394 |
Signed-off-by: Jiaxiao Zhou <[email protected]>
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| /// A simple Spin event component. | ||
| #[event_component] |
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One small nit / aesthetic preference. Can we call this macro cloud_event_component and the module in the sdk exposing utilities cloud_event?
Signed-off-by: Jiaxiao Zhou <[email protected]>
Signed-off-by: Jiaxiao Zhou <[email protected]>
Mossaka
changed the title
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I have restricted the scope of this SIP to only implement spin SDK that adapts CloudEvents http binding, per our discussion at the community meeting. @radu-matei @lann |
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Some interestings future SIPs are
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Signed-off-by: Jiaxiao Zhou <[email protected]>
| 2. Reusability: you can reuse the same event components with different protocols bindings, such as AMQP and Kafka. | ||
| 3. Chaining: you can chain multiple event components together since they share the same component signature. | ||
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| #### CloudEvents trigger |
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Is a trigger still relevant for the SIP?
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No, as I put this in future considerations.
| sink = "http://localhost:8080/someresource" | ||
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| Note that the sink address is only used when the component is invoked. The component will make a outbound HTTP request that includes the CloudEvents to the sink address. |
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Is a "sink address" specific for HTTP?
What is the default way of returning a result from a CloudEvents invocation?
For example, if there is an invocation triggered by an AMQP event, what is the expectation for the result?
Should the component itself make outbound requests (be those HTTP, or publish messages), or is it expected that the underlying runtime should do something with the returned event data?
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yeah forgot about the sink proposal. I was thinking to let the Spin runtime to send events to sinks, which are addressable. But now it makes more sense to just allow user to use outbound-http-cloudevents to send events.
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@Mossaka I did a small write-up for my thoughts around CloudEvents in Spin in #394 (comment), let me know what you think. |
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I will update the SIP to reflect on the discussion on #394 . In particular, the implementation of CloudEvetns "feature" is quiet large, and I want to break it down to several small SIPs. |
Signed-off-by: Jiaxiao Zhou [email protected]