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Capped Crowdsale Contract

Twitter: Jack Lee｜Conflux DAO

Community: JackLee.io ｜Conflux Forum

All code and tutorials are open-sourced on GitHub: https://github.com/jackleeio/TokenCraft

Overview

The CappedCrowdsale contract allows project teams to raise funds by selling ERC20 tokens with a cap on the total amount of tokens sold. This contract ensures that the token sale does not exceed the specified cap.

Contract

CappedCrowdsale Contract: CappedCrowdsale.sol

Testing

forge test --match-contract CappedCrowdsaleTest -vvv

Tests should cover the following scenarios:

  1. Initial token allocation
  2. Validation of crowdsale start and end times
  3. Token purchase behavior
  4. Withdrawal of unsold tokens
  5. Enforcement of the cap on total tokens sold

Method Calls

The CappedCrowdsale contract inherits from Ownable. The main method calls are:

  1. buyTokens(): Allows users to purchase tokens.
  2. withdrawTokens(): Allows the owner to withdraw unsold tokens.
  3. hasCrowdsaleStarted(): Checks if the crowdsale has started.
  4. hasCrowdsaleEnded(): Checks if the crowdsale has ended.

Deployment Script

The CappedCrowdsaleDeploy.s.sol script is used to deploy the token contract and the crowdsale contract. It sets the following parameters:

  • Rate: 1 ETH = 100 tokens
  • Crowdsale allocation: Set as needed
  • Crowdsale start time: 1 day after deployment
  • Crowdsale duration: 30 days
  • Crowdsale cap: Set to 1,000,000 tokens

To deploy the CappedCrowdsale, you can use the following script:

forge script script/Crowdsale/CappedCrowdsaleDeploy.s.sol:CappedCrowdsaleDeploy --rpc-url $RPC_URL --broadcast --verify

Note: Before deploying, make sure your account has enough native tokens (such as ETH, CFX) to pay for gas fees.