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design_pattern_desicions.md

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Design Patterns

Fail Early, Fail Loud

Where needed, the contract fails by calling revert().

  • buyBronzeSubscription
  • buySilverSubscription
  • buyGoldSubscription

Restricting Access

Certain functions are restricted to the owner of the contract using onlyOwner.

  • setBronzeAmount
  • setSilverAmount
  • setGoldAmount
  • burn

Certain functions are restricted to the contract itself using internal.

  • mint

Circuit Breaker

The Pausable library is used which allows the contract owner to pause the contract. The whenNotPaused modifier is used on functions which will only work if the contract is not paused. Note that mint does not have whenNotPaused. It is an internal function and the functions which call it do have this modifier.

Mortal (not used)

While useful, a self destruct pattern was explicitly ommitted as its use would show that users tokens have the possibility of being removed from the blockchain.