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OZ Clones.md

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191 - OZ Clones

OpenZeppelin Clones: EIP 1167 is a standard for deploying minimal proxy contracts, also known as “clones".

To simply and cheaply clone contract functionality in an immutable way, this standard specifies a minimal bytecode implementation that delegates all calls to a known, fixed address.

The library includes functions to deploy a proxy using either create (traditional deployment) or create2 (salted deterministic deployment).

It also includes functions to predict the addresses of clones deployed using the deterministic method.

  1. clone(address implementation) → address instance: Deploys and returns the address of a clone that mimics the behaviour of implementation. This function uses the create opcode, which should never revert.

  2. cloneDeterministic(address implementation, bytes32 salt) → address instance: Deploys and returns the address of a clone that mimics the behaviour of implementation. This function uses the create2 opcode and a salt to deterministically deploy the clone. Using the same implementation and salt multiple times will revert, since the clones cannot be deployed twice at the same address.

  3. predictDeterministicAddress(address implementation, bytes32 salt, address deployer) → address predicted: Computes the address of a clone deployed using Clones.cloneDeterministic.

  4. predictDeterministicAddress(address implementation, bytes32 salt) → address predicted: Computes the address of a clone deployed using Clones.cloneDeterministic.

Slide Screenshot

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Slide Text

  • EIP-1167 Minimal Proxy Contracts
  • Delegate -> Fixed Impl
  • Deploy -> Create/Create2
  • clone(implementation) -> instance
  • cloneDetereministic(implementation, salt) -> instance

References

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