eth/pol: Gasless redemptions using account abstraction

[martonp]

• Overview:

  • Uses ERC-4337 for account abstraction in gasless redemptions.
  • Users can now perform gasless redemptions by specifying a bundler endpoint in wallet settings.
  • If insufficient balance, redemption transactions are handled via user operations sent to the bundler, which then submits to the network and takes a fee.

• Changes in dex/networks/eth:

  • Updated V1 ETH swap contract to support account abstraction via the IAccount interface.
  • Added functions:
    • validateUserOp: Validates user operations and prepays gas for redemption.
    • redeemAA: Executes the redemption.

• Changes in client/asset/eth:

  • ReserveNRedemptions updated to return 0 without error if there is insufficient funds for redemption, but a bundler is configured.
  • Added GaslessRedeem function for bundler-based redemptions when ReserveNRedemptions returns 0.
  • Updated txDB to order transactions by timestamp instead of nonce, now using lexi instead of raw badgerDB.
  • Added logic to keep track of pending user operations, and confirming redemptions done using account abstraction.

• Changes in client/core:

  • Calling GaslessRedeem instead of Redeem if ReserveNRedemptions returns 0.
  • Post-redeem actions:
    • For Redeem, immediately sends a redeem message to the server.
    • For GaslessRedeem, waits for ConfirmRedemption to ensure submission before messaging the server with the updated coin ID (now includes both user op ID and tx hash).

• Changes in server/asset/eth:

  • Added support for validating redemptions submitted by a bundler. The bundler must have submitted a transaction before the server is notified.

• Changes in server/market:

  • Update balance checking for redemptions of EVM base assets to no longer require a balance. Token redemptions still require a balance.

I have tested using Alchemy on testnet, and it works well. I have also tested with Pimlico, but there are some issues. I'm in contact with their support to resolve them. I will keep testing other bundler providers.

[buck54321]

This all looks very reasonable. Love that lexi upgrade.

[JoeGruffins]

It seems there are still conflicts.