elrond-wasm-rs

Rust smart contract library designed for Elrond's Arwen VM. Also provides a debugging mode with mocks.

Examples

For examples on how to use the Elrond WASM framework, see https://github.com/ElrondNetwork/elrond-wasm-rs/tree/master/contracts/examples

IDE

The framework is designed to be easiest to use with the Elrond IDE VSCode extension: https://marketplace.visualstudio.com/items?itemName=Elrond.vscode-elrond-ide

Manual build

To build a smart contract without the IDE, run the following command in the contract crate:

./build-wasm.sh

In case this doesn't work, you might not have rustc configured properly. Try:

rustup toolchain install nightly
rustup default nightly
rustup target add wasm32-unknown-unknown

Debugging

Step-by-step debugging of smart contracts is possible in VSCode. To do this, it is required to have a separate debug crate and to have tasks.json and launch.json in .vscode properly configured. See https://github.com/ElrondNetwork/elrond-wasm-rs/tree/master/contracts/examples for examples on how to set this up.

Advanced

To debug macros:

cargo +nightly rustc --bin wasm -- -Z unstable-options --pretty=expanded > demacroed.rs

To check wasm size:

twiggy top -n 20 target/wasm32-unknown-unknown/release/wasm.wasm