CosmWasm VM

This is an abstraction layer around the wasmer VM to expose just what we need to run cosmwasm contracts in a high-level manner. This is intended both for efficient writing of unit tests, as well as a public API to run contracts in eg. go-cosmwasm. As such it includes all glue code needed for typical actions, like fs caching.

Setup

There are demo files in testdata/contract*.wasm. Those are compiled and optimized versions of contracts/hackatom run through cosmwasm-opt.

To rebuild the test contract, go to the repo root and do

docker run --rm -v "$(pwd)":/code \
  --mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
  --mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
  cosmwasm/rust-optimizer:0.8.0 ./contracts/hackatom \
  && cp contracts/hackatom/contract.wasm packages/vm/testdata/contract_0.8.wasm

Testing

By default, this repository is built and tested with the singlepass backend. This requires running Rust nighty:

cd packages/vm
cargo +nightly test

To test with Rust stable, you need to switch to cranelift:

cd packages/vm
cargo test --no-default-features --features default-cranelift

License

This package is part of the cosmwasm repository, licensed under the Apache License 2.0 (see NOTICE and LICENSE).