2 level delegatecall (from custom proxy to upgradeable proxy and to implementation)

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Hello!

I'm trying to implement the next architecture: a factory contract that deploys custom proxies that are able to interact with upgradeable OZ proxy.

FACTORY -> (GROUP OF CUSTOM PROXIES) -> OZ PROXY -> IMPLEMENTATION

All custom proxies deployed through the factory should delegatecall to one OZ UPG proxy and OZ UPG proxy should delegatecall to the implementation contract.

Is it possible to implement 2 level delegatecall? I'm trying to do this and during the test, it fails to call the custom proxy and to execute code from the implementation contract.

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The pattern you described sounds like the beacon proxy concept. Have you considered beacons? See BeaconProxy and UpgradeableBeacon in https://docs.openzeppelin.com/contracts/5.x/api/proxy

It would be similar to your diagram, but each Pool Proxy would be a BeaconProxy instead, and the Pool Upgradeable Proxy would be an UpgradeableBeacon.

Calling a BeaconProxy would do the following: it would retrieve the implementation address from its associated UpgradeableBeacon, then the BeaconProxy does a delegatecall directly to the implementation. There is no need for a 2 level delegatecall in this situation.

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Thank you @ericglau
It is really what I need

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