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Overview

The CCIP Modules are designed to facilitate cross-chain asset transfers of LST tokens between EVM chains and synchronize exchange rates.

Compatibility

Supports all EVM chains supported by ChainLink
Enables automated cross-chain exchange rate synchronization
Supports token cross-chain transfers (requires collaboration with Chainlink for TokenPool deployment before CCIP 1.5 update)

Introduction

The CCIP Modules comprise two main components:

Exchange Rate Cross-Chain Module
Token Cross-Chain Module

These modules are independent and can be deployed and used separately.

Repository: Evm Module Contracts

Rate Cross-Chain

Includes four main contracts:

RateSender: Deployed on the source chain, periodically checks for rate updates and sends rate messages. Supports Proxy deployment for upgradability.
RateReceiver: Deployed on the destination chain, receives LST rates.
CCIPRateProvider: Deployed on the destination chain, provides LST rates for third-party use.
RegisterUpkeep: Integrates Automation service, enables automatic triggering upon deployment.

Token Cross-Chain

Includes one main contract:

TokenTransferor: Deployed using Proxy pattern, supports upgrades and permission control.

Note: Token cross-chain functionality requires whitelisting with Chainlink

Installation

Prerequisites

Node.js
Yarn

Steps

Clone the repository:

git clone https://github.com/stafiprotocol/evm-module-contracts.git
cd evm-module-contracts

Install dependencies:
```
yarn install
```

Configure the network in hardhat.config.js,Add or replace the original chain and target chain configuration for your intended deployment:

networks: {
    hardhat: {
        allowUnlimitedContractSize: true,
    },
    local: {
        allowUnlimitedContractSize: true,
        url: "http://127.0.0.1:8545/"
    },
    fuji: {
        url: process.env.AVALANCHE_FUJI_RPC,
        accounts: [process.env.PRIVATEKEY]
    },
    ethSepolia: {
        url: process.env.SEPOLIA_RPC,
        accounts: [process.env.PRIVATEKEY]
    },
}

Set up environment variables in .env file,Add or replace the original chain and target chain configuration for your intended deployment:

AVALANCHE_FUJI_RPC=https://ava-testnet.public.blastapi.io/ext/bc/C/rpc
SEPOLIA_RPC=https://rpc.ankr.com/eth_sepolia
PRIVATEKEY=
EHTERSCAN_API_KEY=

Deployment

Rate Cross-Chain Deployment

The Router and Link addresses for each chain, as well as the chain selector, are available from networks supported by Chainlink

Option 1: Deploy contracts individually

Deploy RateSender on the source chain:

ROUTER_ADDRESS=0x.. LINK_ADDRESS=0x.. npx hardhat run ./scripts/RateMsg/deploy_sender.js --network source_chain

Deploy RateReceiver on the destination chain:

ROUTER_ADDRESS=0x.. ALLOWED_SENDER_ADDRESS=0x.. npx hardhat run ./scripts/RateMsg/deploy_receiver.js --network dest_chain

Deploy CCIPRateProvider on the destination chain:

INITIAL_RATE=1000000000000000000 RECEIVER_ADDRESS=0x.. npx hardhat run ./scripts/RateMsg/deploy_rate_provider.js --network dest_chain

Option 2: Deploy all contracts at once

Copy and modify the configuration file:

cp ./scripts/RateMsg/config.example.json ./scripts/RateMsg/config.json

Modify config.json:

{
  "routerAddressSource": "0x..", // Source chain router address
  "routerAddressDestination": "0x..", // Destination chain router address
  "linkAddressSource": "0x..", // Source chain LINK address
  "linkAddressDestination": "0x..", // Destination chain LINK address
  "initialRate": "1000000000000000000", // Initial rate for the destination chain
  "tokens": [] // Use when testing, leave blank when deploying to a production environment
}

Run the deployment script:

NETWORK_SOURCE=source_chain NETWORK_DESTINATION=dst_chain ./scripts/RateMsg/deploy_all.sh

RegisterUpkeep Deployment

REGISTRAR_ADDRESS from Automation Documents

LINK_ADDRESS=0x.. REGISTRAR_ADDRESS=0x..  npx hardhat run ./scripts/RateMsg/deploy_register_upkeep.js --network source_chain

Token Cross-Chain Deployment

Deploy the TokenTransferor contract:

ROUTER_ADDRESS=0x.. npx hardhat run ./scripts/TokenTransfer/deploy.js --network source_chain

Configuration

Configure RateSender contract:

Add token information using addTokenInfo method:

/// @notice Adds a new token rate and its associated information for a specific chain
/// @dev This function combines the functionality of adding a token rate and its chain-specific information
/// @param tokenName The name of the token to add
/// @param _rateSource The address of the contract providing the rate for this token
/// @param _receiver The address of the receiver contract on the destination chain
/// @param _dstRateProvider The address of the rate provider contract on the destination chain
/// @param _selector The chain selector for the destination chain
function addTokenInfo(
    string memory tokenName,
    address _rateSource,
    address _receiver,
    address _dstRateProvider,
    uint64 _selector
) external onlyRole(ADMIN_ROLE)

Add new destination chains using addTokenDstInfo method:

 /// @notice Adds destination information for a token
/// @param tokenName Name of the token
/// @param _receiver Receiver address on the destination chain
/// @param _dstRateProvider Rate provider address on the destination chain
/// @param _selector Chain selector for the destination chain
function addTokenDstInfo(
    string memory tokenName,
    address _receiver,
    address _dstRateProvider,
    uint64 _selector
) external onlyRole(ADMIN_ROLE)

Fund RateSender contract with LINK tokens for cross-chain message fees

Option 1: Use Chainlink Automation web interface

Option 2: Deploy RegisterUpkeep contract and call registerAndPredictID method:

Authorize a certain amount of LINK tokens to the RegisterUpkeep contract for paying fees to Chainlink when registering Upkeep.

function registerAndPredictID(
    Params calldata params
) external payable nonReentrant whenNotPaused returns (uint256)
 
struct Params {
    string name; // upkeep name
    string email; // optional Chainlink Automation is not currently enabled
    address upkeepContract; // address of the RateSender contract
    uint32 gasLimit; // gas limit for the upkeep
    address adminAddress; // address of the admin
    uint96 amount; // amount of LINK tokens
}

After a successful call to registerAndPredictID, you can see something like this on the web interface

Usage

Token Cross-Chain Transfer

Authorize tokens for cross-chain transfer to the TokenTransferor contract

Call updateChainAllowlist and updateTokenAllowlist methods on the TokenTransferor contract:

function updateChainAllowlist(uint64 _destinationChainSelector, bool _allowed) external onlyRole(ADMIN_ROLE)
function updateTokenAllowlist(address _token, bool _allowed) external onlyRole(ADMIN_ROLE)

Call transferTokens method on the TokenTransferor contract:

/// @notice Calculate the required fee for transferring tokens to another chain.
/// @dev This function simulates the token transfer process to calculate the fee,
///      without actually performing the transfer. It uses the same logic as the
///      transferTokens function to ensure fee consistency.
/// @param _destinationChainSelector The identifier (selector) for the destination blockchain.
/// @param _receiver The address of the recipient on the destination blockchain.
/// @param _token The address of the token to be transferred.
/// @param _amount The amount of tokens to be transferred.
/// @return fees The amount of native currency required as fee for the cross-chain transfer.
function transferTokens(
    uint64 _destinationChainSelector,
    address _receiver,
    address _token,
    uint256 _amount
)
external
payable
nonReentrant
validateReceiver(_receiver)
onlyAllowlistedToken(_token)
onlyAllowlistedChain(_destinationChainSelector)
returns (bytes32 messageId)

Notes

All CCIP cross-chain transactions can be viewed on CCIP Explorer using the source chain transaction hash.
Token cross-chain functionality requires whitelisting with Chainlink.
Router addresses and chain selectors can be found in the ChainLink supported networks documentation.

Point System Neutron Token ICS20 Module