Export host functions from sp-sandbox

[shamilsan]

We face an error call to a missing function env:ext_sandbox_... when trying to connect a parachain that uses sp-sandbox (https://github.com/paritytech/substrate/tree/master/primitives/sandbox). This PR fixes this problem by exporting correspondent host functions.

[bkchr]

These are not exported, because they are not stable and may change in the future. It is also currently not planed for the near future to enable them. Why do you need them?

[shamilsan]

These are not exported, because they are not stable and may change in the future. It is also currently not planed for the near future to enable them. Why do you need them?

We use sp-sandbox in our project (https://github.com/gear-tech/gear/blob/master/core-backend/sandbox/Cargo.toml) and have the following error when trying to connect it as a parachain to the local Rococo testnet:

AbortedDueToTrap(MessageWithBacktrace { message: "call to a missing function env:ext_sandbox_memory_new_version_1", ... })

We can't avoid it therefore we can't run our node as a parachain collator.

[bkchr]

As I said, this is disabled on purpose and will not be enabled in the near future AFAIK.

If you fork, please check upstream Substrate on how this is solved there. We currently use wasmi inside wasm to have the sandboxing.

[shamilsan]

As I said, this is disabled on purpose and will not be enabled in the near future AFAIK.

Is it possible to enable it under v1 and provide stabilized version later under v2?

If you fork, please check upstream Substrate on how this is solved there. We currently use wasmi inside wasm to have the sandboxing.

I've not found an example of Substrate node with using Cumulus and sandbox together. substrate-parachain-template doesn't use sp-sandbox. Could you please provide such kind of example?

[bkchr]

Is it possible to enable it under v1 and provide stabilized version later under v2?

No. We would need to support these interfaces until the end of the universe.

I've not found an example of Substrate node with using Cumulus and sandbox together. substrate-parachain-template doesn't use sp-sandbox. Could you please provide such kind of example?

As I said before, if you fork, you should may merge back master from time to time: paritytech/substrate#9592

[shamilsan]

As I said before, if you fork, you should may merge back master from time to time: paritytech/substrate#9592

Our Substrate fork is based on the 2022-07-12 master, so this PR has been already there. But as I see it doesn't work with the wasmer-sandbox feature. This seems to be our case. Unfortunately, wasmi works a way slower than wasmer but now I see the cause of the problem, thank you for the hint.

[bkchr]

Yeah wasmi is slower than wasmer, but wasmer is even more experimental 🙈

[bkchr]

I'm going to close this for now.