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design_pattern_decisions.md

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Design Pattern Decisions

Inter-Contract Execution

  • CryptoComposer calls CryptoComposerTokenVendor to get allowance of user to check whether they have enough balance and to transfer CCT from user to itself.

Inheritance and Interfaces

  • CryptoComposer inherits CryptoComposerNFTMinter, which also inherits openzeppelin's ERC721.sol
  • CryptoComposerTokenVendor also defines additional features on top of CryptoComposerToken which uses openzeppelin's ERC20.sol
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

Access Control Design Patterns

  • CryptoComposerToken is AccessControl to grant MINTER_ROLE to CryptoComposer
  • CryptoComposerTokenVendor is Ownable to allow only owner to set token price.
  • CryptoComposerNFTMinter is Ownable to allow only owner to metadata base url.