sbnair / substrate-runtime-contract-sample

A sample Substrate runtime showing interaction between runtime modules (pallets) and smart contracts (ink!).

Substrate Runtime-Contract Sample

A sample Substrate runtime showing interaction between runtime modules (pallets) and smart contracts (ink!).

Runtime to Contract Interaction

In the template module (pallet) in the runtime, following funtions are used for contract interaction:

• call_contract
• get_contract_storage

Contract to Runtime Interaction

In the custom_type contract, the read_custom_runtime funtion is used to query the runtime storage for a custom struct.

Custom types for Polkadot JS

{
  "Foo": {
    "id": "u32",
    "data": "Vec<u8>"
  }
}

Generating Storage Keys

Keys to storage items in substrate runtime are constructed by hashing the raw key.

Refer to the substrate documentation about storage types and key construction.

Build Node and Runtime

Install Rust:

curl https://sh.rustup.rs -sSf | sh

Initialize your Wasm Build environment:

./scripts/init.sh

Build Wasm and native code:

cargo build --release

Build Contract

Install Cargo Contract:

cargo install --force --git https://github.com/paritytech/cargo-contract

Inside the contracts/custom_type sub-directory, run the following commands to build the contract and generate its metadata:

cargo +nightly contract build

cargo +nightly contract generate-metadata

Run

Start a development chain with:

./target/release/substrate-runtime-contract-sample --dev

Detailed logs may be shown by running the node with the following environment variables set: RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev.

Additional CLI usage options are available and may be shown by running cargo run -- --help.

Deploy the contract

Once the Substrate node is running, deploy and instantiate the contract using the Polkadot JS portal.