Chainlink CCIP - Proof of Concept

Description:

This project demonstrates cross-chain message passing using Chainlink CCIP between the Base Chain (Sepolia testnet) and Optimism (Sepolia testnet). It allows sending a wallet address from Optimism to Base and retrieving the associated tier information.

Prerequisites:

• Node.js (https://nodejs.org/)
• Foundry (https://github.com/foundry-rs/foundry)

Clone the repository:

$ git clone git@github.com:skeletordapps/chainlink-ccip-poc.git

Install Foundry dependencies:

$ foundryup && forge install

Configuration:

Create a .env file in the project root directory with the following environment variables:

BASE_SEPOLIA_RPC_URL="https://sepolia.base.org"
OPTIMISM_SEPOLIA_RPC_URL="https://sepolia.optimism.io"

BASE_SEPOLIA_CHAIN_SELECTOR=10344971235874465080
OPTIMISM_SEPOLIA_CHAIN_SELECTOR=5224473277236331295

BASE_SEPOLIA_ROUTER_ADDRESS=0xD3b06cEbF099CE7DA4AcCf578aaebFDBd6e88a93
OPTIMISM_SEPOLIA_ROUTER_ADDRESS=0x114A20A10b43D4115e5aeef7345a1A71d2a60C57

BASE_SEPOLIA_LINK_ADDRESS=0xE4aB69C077896252FAFBD49EFD26B5D171A32410
OPTIMISM_SEPOLIA_LINK_ADDRESS=0xE4aB69C077896252FAFBD49EFD26B5D171A32410

WALLET_A=0x
WALLET_B=0x
WALLET_C=0x

Important: Replace the placeholder wallet addresses (WALLET_A, WALLET_B, WALLET_C) with your actual testnet wallet addresses if you intend to use them in the tests.

Test

$ forge test && forge coverage

Coverage

Ran 1 test suite in 21.46s (21.46s CPU time): 3 tests passed, 0 failed, 0 skipped (3 total tests)

File	% Lines	% Statements	% Branches	% Funcs
src/Answer.sol	100.00% (22/22)	100.00% (28/28)	50.00% (1/2)	83.33% (5/6)
src/Ask.sol	100.00% (15/15)	100.00% (20/20)	50.00% (1/2)	100.00% (5/5)
src/Points.sol	100.00% (1/1)	100.00% (1/1)	100.00% (0/0)	100.00% (1/1)
src/Tiers.sol	60.00% (9/15)	54.55% (12/22)	100.00% (1/1)	75.00% (3/4)
Total	88.68% (47/53)	85.92% (61/71)	60.00% (3/5)	87.50% (14/16)

Contracts

Tier.sol Defines tiers on the Base Chain, each with a name, minimum points, and maximum points.

Points.sol Manages a list of wallets and their corresponding points on the Base Chain. This contract is used to determine the tier associated with a wallet's points.

Ask.sol Deployed on Optimism, this contract facilitates sending a wallet address to the Base Chain to retrieve tier information.

Answer.sol Receives requests from other chains (in this case, Optimism) to check the tier of a specified wallet address on the Base Chain.

Additional Notes:

• Remember to replace the placeholder wallet addresses in the .env file with your own testnet addresses if you plan to use them in the tests.
• Ensure that you have sufficient testnet funds in your wallets to cover gas costs during testing.
• This poc only aims to test crosschain messages sending a question and obtaining an answer, that's why we don't have a full coverage for all aspects.