ParaProxy EIP-2535 Operations

ParaProxy EIP-2535 Operations
The main way to interact with the ParaProxy is by using the function updateImplementation
which has the following signature
function updateImplementation(
        ProxyImplementation[] calldata _implementationParams,
        address _init,
        bytes calldata _calldata
    ) external
​
ProxyImplementation is 
​
struct ProxyImplementation {
        address implAddress;
        ProxyImplementationAction action;
        bytes4[] functionSelectors;
    }
​
ProxyImplementationAction is
​
enum ProxyImplementationAction {
        Add,
        Replace,
        Remove
    }
Only PoolAddressProvider can interact with the ParaProxy updateImplemnentation
Adding New Selectors
to add new selectors, we have to call updatePoolImpl in PoolAddressProvider
await addressesProvider.updatePoolImpl(
      [
        {
          implAddress: newPool.address,
          action: 0,
          functionSelectors: poolSelectors,
        },
      ],
      poolAddress,
      newPool.interface.encodeFunctionData("initialize", [
        addressesProvider.address,
      ])
    )
implAddress: is the implementation address
action: is action enum which can be Add (0), Replace (1), Remove (2)
functionSelectors: is an array of the 4byte keccak256 of the function selectors
poolAddress: is the address of the contract to call after the addition of the selectors. this can be an initialize function like what we provided in the following line:
newPool.interface.encodeFunctionData("initialize", [ addressesProvider.address, ])
Updating Existing Selectors
to update selectors, we have to call updatePoolImpl in PoolAddressProvider
await addressesProvider.updatePoolImpl(
      [
        {
          implAddress: newPool.address,
          action: 1,
          functionSelectors: poolSelectors,
        },
      ],
      poolAddress,
      newPool.interface.encodeFunctionData("initialize", [
        addressesProvider.address,
      ])
    )
implAddress: is the implementation address
action: is action enum which can be Add (0), Replace (1), Remove (2)
functionSelectors: is an array of the 4byte keccak256 of the function selectors
poolAddress: is the address of the contract to call after the addition of the selectors. this can be an initialize function like what we provided in the following line:
newPool.interface.encodeFunctionData("initialize", [ addressesProvider.address, ])
Deleting Selectors
to delete selectors, we have to call updatePoolImpl in PoolAddressProvider
await addressesProvider.updatePoolImpl(
      [
        {
          implAddress: ZERO_ADDRESS,
          action: 2,
          functionSelectors: oldPoolSelectors,
        },
      ],
      ZERO_ADDRESS,
      "0x"
    )
implAddress: this should be zero address
action: is action enum which can be Add (0), Replace (1), Remove (2)
functionSelectors: is an array of the 4byte keccak256 of the function selectors to delete
next argument is ZERO_ADDRESS or we can specify an implementation to call if we want then specify the exact encoded function to call.
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