Deployment

Architecture

Uniswap V2 is composed of Core and Periphery layers.

The Core consists of a singleton Factory and multiple Pair contracts, designed with a “brutalist” minimalism to ensure functional elegance and minimize the attack surface.

This architectural separation means the Core handles safety and the preservation of invariants, while the Periphery handles domain-specific logic like routing and WETH wrapping.

Contracts

• Liquidity Pool (Pair)
  • holds balances of two unique ERC-20 tokens
  • and enforces rules for swapping, depositing, and withdrawing them.
  • native ETH is not supported; it must be wrapped into WETH to interact with the protocol
• Factory
  • instantiates pairs
  • uses the Ethereum CREATE2 opcode to generate a deterministic address for the pair contract
  • f(addresses of the two tokens)
  • calculated off-chain without querying the blockchain state

Deployment

• WETH9: is the canonical ETH ERC20 wrapper where you can exchange ETH to/from WETH (1:1)
• UniswapV2Factory: creates UniswapV2Pair pool pairs
• UniswapV2Router02
  • stateless, therefore, easily replaceable
  • main user-facing contract
  • extra helper functions
• UniswapV2Router01: replaced by UniswapV2Router02 because of a low-severity bug

// UniswapV2Workflows:deploy:25:54
static async deploy(lensClient: LensClient<UniswapV2Artifacts>) {
  const feeToSetAccount = privateKeyToAccount(generatePrivateKey());

  const factoryDeployResult = await lensClient.deploy(
    'contracts/uniswap-v2/v2-core/contracts/UniswapV2Factory.sol:UniswapV2Factory',
    [feeToSetAccount.address]
  );

  const wethDeployResult = await lensClient.deploy(
    'contracts/uniswap-v2/v2-periphery/contracts/test/WETH9.sol:WETH9',
    []
  );

  const router2DeployResult = await lensClient.deploy(
    'contracts/uniswap-v2/v2-periphery/contracts/UniswapV2Router02.sol:UniswapV2Router02',
    [factoryDeployResult.createdAddress!, wethDeployResult.createdAddress!]
  );

  const factory = lensClient.getContract(
    factoryDeployResult.createdAddress!,
    'contracts/uniswap-v2/v2-core/contracts/UniswapV2Factory.sol:UniswapV2Factory'
  );

  const router2 = lensClient.getContract(
    router2DeployResult.createdAddress!,
    'contracts/uniswap-v2/v2-periphery/contracts/UniswapV2Router02.sol:UniswapV2Router02'
  );

  return { factory, router2 };
}