Rust runtime for OP_NET VM

• Rust contract is able to run under op-vm
• The interface is defined by btc-runtime
• Library is tested like: opnet-unit-test

Compilation

cargo build --release -p example
wasm-opt -O2 -Oz ../target/wasm32-unknown-unknown/release/example.wasm -o ./rust.wasm

Testing

cp ./rust.wasm ../opnet-unit-test/bytecode/rust.wasm
node build/tests/rust.js 

Size

• Compiled code from moto library: 23KB (23464B)
• Unoptimized code from current Rust library: 31KB (31359B) - incomplete
• Optimized code with wasm-opt: 22KB (21778B) - incomplete

Structure

• ./src/ - Library providing the interface and helper functions for contract interaction
• ./example/ - Sample smart contract, similar to contract used in unit tests

TODO

Buffer operations and manipulations

• Investigate if it’s possible to directly map structs to memory
• Write memory manipulation methods (readAddress, readUint32, etc.)
• Create unit tests and check for memory leaks

Contract helpers

• Coding methods like byte4, encodeSelector, hash, etc.
• Decoding passed buffers (set_environment, execute, on_deploy) into correct structures

Smart contract and unit tests

• Copy basic functionality from OP20 contract to examples, as needed