WebAssembly / WebAssembly/component-model
Support to invoke user defined callbacks inside WASM component from wasmtime
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- Dominant language
- WebAssembly
- Stars
- 1.4k
- Forks
- 130
- Avg merge
- 2d 1h
- Merged PRs (30d)
- 15
Description
Programs like eBPF usually hire a callback function to let underlying framework to invoke it when a certain kind of event happened, to support this in WASM component model, it would be very useful to enable developers coding WASM component with callbacks.
Current WASM component model doesn't have an appropriate keyword/primitive to support that, and wasmtime doesn't support reentrance to WASM component.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by investigating the WebAssembly component model's lack of a callback primitive and wasmtime's stated lack of component reentrance. Define the callback and reentrance behavior needed for eBPF-like event handling, then confirm that the component model and wasmtime support it consistently.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- wasm
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100