envoyproxy/envoy

Add documentation about Wasm extension internals

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#15.361 aberto em 8 de mar. de 2021

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area/docsarea/wasmhelp wanted

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Description

Given that Wasm extension mechanism seems more complex than standard built-in extensions, it is useful provide the dedicated documentation about Wasm extension internals for end-users and Envoy core developers.

This would include, for example,

  • How Envoy is integrated with Proxy-Wasm C++ Host
  • How runtimes interact with Envoy
  • The Threading model
  • How VMs are initialized and Wasm binaries are loaded
  • Envoy specific implementation details
  • How to provide Envoy specific ABI
  • Considerations and limitations (e.g. memory consumptions, etc.)
  • How to develop statically linked NullVm Wasm plugins

and could be based on https://github.com/proxy-wasm/spec/blob/master/docs/WebAssembly-in-Envoy.md

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