Depends on #1241

Contract Variables to add (all variables are internal)

• address feeSweeper : Address of contract that will receive the protocol fees when withdrawProtocolFees is called. This is important to make withdrawProtocolFees permissionless, and reduce the risk of informing the wrong receiver of protocol fees.

Functions to add

getFeeSweeper

• return:
  • feeSweeper

setFeeSweeper

• permissioned
• arguments:
  • address newFeeSweeper : Address of the contract that will receive fees when withdrawProtocolFees is called
• Logic:
  • feeSweeper = newFeeSweeper (nothing to validate, except the permission)
  • Emit event FeeSweeperChanged with new fee sweeper address

withdrawProtocolFees

Withdraw protocol fees of a given token to feeSweeper contract.

• permissionless
• arguments
  • address token : Token which will be withdrawn
• Logic
  • Transfer protocolFees[token] to feeSweeper contract
  • protocolFees[token] = 0
  • Emit event CoWProtocolFeeWithdrawn
    • address token
    • address feeSweeper
    • uint256 amount