New pool account where the funding amount + tx fee leaves less balance than open channels' anchor reserves causes pool to error on startup #514
Description
If a user opens a new pool account, where the account funding amount + the onchain transaction fee leaves less balance than the current open channels anchor reserves, pool will accept the creation of the account but instantly error, as such a transaction is not allowed to be created by lnd.
Furthermore, when restarting pool, the startup process will error with:
unable to start account manager: unable to resume account [string]: rpc error: code = Unknown desc = the outputs to be sent would leave insufficient reserves for anchor channels in the wallet
This error will be repeated on every restart, until the user has deposited enough new onchain balance to exceed the total value of:
- The account funding amount
- The onchain transaction fee
- The total channel anchor reserves of all open channels
This was reported by a user through:
lightninglabs/lightning-terminal#1193
To resolve the issue for future users, we've discussed offline that we could potentially add the following functionality:
- We shouldn't make
poolerror on startup if this occurs, but rather log it as a warning. - We could potentially add a 100k sats buffer, and not allow users to fund their pool accounts with the entire on-chain balance and require that the amount at least leaves out the 100k sats buffer.