Common Contracts for Nervos CKB

Yes, the repository name Common Contracts Base comes from Common Knowledge Base~ O(∩_∩)O

A Public Good focusing on multi-chain, which will demonstrate the cryptographic primitives on Nervos. This repository refactored and rewrote the logic from rust-playground (PLAN), so if you wanna use the logic code of DNA in non-smart-contract environment, see rust-playground.

0. start: The start of learning CKB development.
1. scripts: The contracts scripts were organized from Nervos explorer.
2. contracts (TODO)
3. Code example of usage (TODO)

Common Usage

I still haven't tried a complete test. The test code come from Testing part.

0. Explanation When deploy a contract, we can get tx_hash and index.
   Through tx_hash and index, we can call a deployed contract in another contract.

1. Deploy the echo contract and get out_point info.

let echo_bin = {
    let mut buf = Vec::new();
    File::open("../build/debug/echo")
        .unwrap()
        .read_to_end(&mut buf)
        .expect("read code");
    Bytes::from(buf)
};
let echo_out_point = context.deploy_cell(echo_bin);

// out_point has 2 properties:
//   tx_hash:H256
//   index: uint32.

2. Get cell_dep info by out_point.

let echo_dep = CellDep::new_builder()
    .out_point(echo_out_point)
    .build();

// cell dep:
//   dep_type: uint8. // 0=Code, 8=DepGroup
//   out_point

3. Reference the contract cell in transaction by cell_dep

// build transaction
let tx = TransactionBuilder::default()
    .input(input)
    .outputs(outputs)
    .outputs_data(outputs_data.pack())
    // reference to echo cell
    .cell_dep(echo_dep)
    .build();

4. Test

let err = context.verify_tx(&tx, MAX_CYCLES).unwrap_err();
// check the return code is 42
assert_script_error(err, 42);