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OZ BeaconProxy.md

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189 - OZ BeaconProxy

OpenZeppelin BeaconProxy: implements a proxy that gets the implementation address for each call from a UpgradeableBeacon.

The beacon address is stored in storage slot uint256(keccak256('eip1967.proxy.beacon')) - 1, so that it doesn’t conflict with the storage layout of the implementation behind the proxy.

  1. constructor(address beacon, bytes data): Initializes the proxy with beacon. If data is nonempty, it’s used as data in a delegate call to the implementation returned by the beacon. This will typically be an encoded function call, and allows initializing the storage of the proxy like a Solidity constructor. Requirements: beacon must be a contract with the interface IBeacon.

  2. _beacon() → address beacon: Returns the current beacon address.

  3. _implementation() → address: Returns the current implementation address of the associated beacon.

  4. _setBeacon(address beacon, bytes data): Changes the proxy to use a new beacon. If data is nonempty, it’s used as data in a delegate call to the implementation returned by the beacon. Requirements:

  5. beacon must be a contract

  6. The implementation returned by beacon must be a contract.

Slide Screenshot

189.jpg

Slide Text

  • Implementation Addr -> UpgradeableBeacon
  • Beacon Address -> Slot
  • uint256(keccak256('eip1967.proxy.beach')) - 1
  • Constructor -> Beacon Init
  • _beacon() -> Beacon Addr
  • _implementation()
  • _setBeacon(beacon, data)

References

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