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add option to retain fetchEvent handler #116
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Original file line number | Diff line number | Diff line change |
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@@ -130,6 +130,10 @@ Setting `disableFeatures: ['random', 'stdio', 'clocks']` will disable all featur | |
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Note that pure components **will not report errors and will instead trap**, so that this should only be enabled after very careful testing. | ||
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The features that are not included by default are: | ||
* `'http'` - Support for sending and receiving HTTP requests, depends on `wasi:io` | ||
* `'fetch-event'` - Enables using `fetchEvent` to respond to `wasi:http/[email protected]#handle`. If the target world does note export `wasi:http/[email protected]`, this will be ignored. | ||
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Note that features explicitly imported by the target world cannot be disabled - if you target a component to a world | ||
that imports `wasi:clocks`, then `disableFeatures: ['clocks']` will not be supported. | ||
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Just like we automatically merge WASI imports into the target world, perhaps we can automatically merge the
wasi:http/[email protected]
export into the target world when this feature is used?There was a problem hiding this comment.
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Actually isn't this the default behaviour anyway? Or do we still strip the export if it's not explicitly in the target world?
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With this PR we want to only optionally strip the export from the StarlingMonkey engine here based on the value of the feature. My intention with that statement is to make it such that, if the target world does not export the interface but the feature is enabled, we should probably still strip the export.
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Shouldn't it read "If the target world does export" though? Rather than "does not". Thinking about this further we probably want to make this an explicit error. That is, if you enable this feature and the target world already exports the incoming handler, then we should throw an error that you should either target the incoming handler export, or you should use the fetch event version of it, but not both.
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I think there is a disconnect in what we each mean by the target world. I am talking about the
wit
definition, not the guest content. As in, consider the following worldand the
fetch-event
is set, if we do not strip the export from the engine, it will end up in the output component but maybe that is fine?I also think that there is currently no way to check if a handler is attached to the fetch event but we can check if there is something that targets the incoming handler export so erroring on that would be good, I agree.
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Maybe I am misunderstanding here. To verify my understanding - the proposal above is to not retain
fetchEvent
incase the target world contains thewasi:http/incoming-handler
export and only have the feature take effect if it is not explicitly part of the target world.There was a problem hiding this comment.
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Oh, I see—I had missed that part of it. On that, I agree with you: I think this setting should be usable whether the targeted world includes
incoming-handler
or not.@guybedford doing what you proposed would make it substantially harder to use
FetchEvent
, because now anyone who wants to target an environment that supportswasi:http/proxy
has to edit the target world not to includeincoming-handler
if they want to useFetchEvent
. I think that's a requirement we really shouldn't put on people—and it'd be quite hard for us to satisfy using Spin as a development tool.There was a problem hiding this comment.
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I am happy to update this PR once there is consensus on this discussion.
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Guy and I just discussed this further, and came to the realization that there's a cleaner way to do this: with #117, ComponentizeJS will only generate exports for symbols exported at the JS level, too. Based on that, we could simply say "if after treeshaking we still would export the symbol, then we'll do so. Otherwise, we'll leave it alone."
In effect, that'd mean that if the input StarlingMonkey already includes an export, and content doesn't specify that same export, ComponentizeJS will leave the original export alone.
@karthik2804, if that makes sense to you, then changing #117 accordingly should make it so that this issue isn't needed anymore.
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I think I am roughly tracking it. Currently, #117 is purely for imports. I will take a stab at updating it and see if I understand things correctly and report back.