[Proxy] Implement proxy contract

[nrryuya]

OpenZeppelin Proxy.sol

[yudetamago]

I found a delegation example in vyper test code https://github.com/ethereum/vyper/blob/50b57010ba60d9914a746488bbd939041e914301/tests/parser/functions/test_raw_call.py#L97

[nrryuya]

Gnosis Safe has a family of proxy pattern contracts. https://github.com/gnosis/safe-contracts/tree/development/contracts/proxies

[yudetamago]

specify target address and copy calldata on contract

• https://github.com/zeppelinos/zos/blob/master/packages/lib/contracts/upgradeability/Proxy.sol
• https://github.com/gnosis/safe-contracts/blob/development/contracts/proxies/Proxy.sol

pass target address and calldata from sender

• https://github.com/gnosis/safe-contracts/blob/development/contracts/base/Executor.sol

[yudetamago]

Questions

• How to get calldata on contract? (impossible for now?)
• How to specify the size for arbitrarily calldata? (always set max size? ref: https://gist.github.com/yudetamago/bfc781e9f19036d58393b7c0090b1deb )

[nrryuya]

msg.data is not supported in Vyper and there seems another discussion. Let's postpone this contract for now. https://github.com/ethereum/vyper/pull/896#discussion_r200004489

[nrryuya]

Impl in Solidity

• zos
• gnosis-safe
• Quillhash

[nrryuya]

After msg.data gets supported. https://github.com/ethereum/vyper/issues/1181