swap StartFailed because total required amount is larger than available

[cipig]

found 3 failed swaps with

maker_swap:254] !check_balance_for_maker_swap maker_swap:1346] The total required KMD amount 6.162357815 is larger than available 0.31337041, balance: 0.31337041, locked by swaps: 0

https://dexapi.cipig.net/public/error.php?uuid=ed261d00-8035-4dc9-86d2-34ba2a552b7a
https://dexapi.cipig.net/public/error.php?uuid=d30827cb-dcc5-4629-ba52-800c7ff9fcbd
https://dexapi.cipig.net/public/error.php?uuid=306e0bba-505c-4977-8ef2-b9a0f84d6f5a

they are all from the same maker 2.0.2422_mm2_31d1803b0, the diff between 6.162357815 and 0.31337041 is pretty big and the actual balance is the same with all 3 0.31337041

[cipig]

a new example using latest mm2:

{
   "uuid" : "6982ecbe-9929-4819-8db4-d3ddda29a933",
   "maker_amount" : "2.81776082",
   "error_events" : [
      "StartFailed",
      "NegotiateFailed",
      "TakerFeeValidateFailed",
      "MakerPaymentTransactionFailed",
      "MakerPaymentDataSendFailed",
      "MakerPaymentWaitConfirmFailed",
      "TakerPaymentValidateFailed",
      "TakerPaymentWaitConfirmFailed",
      "TakerPaymentSpendFailed",
      "TakerPaymentSpendConfirmFailed",
      "MakerPaymentWaitRefundStarted",
      "MakerPaymentRefunded",
      "MakerPaymentRefundFailed"
   ],
   "mm_version" : "8faf62398",
   "success_events" : [
      "Started",
      "Negotiated",
      "TakerFeeValidated",
      "MakerPaymentSent",
      "TakerPaymentReceived",
      "TakerPaymentWaitConfirmStarted",
      "TakerPaymentValidatedAndConfirmed",
      "TakerPaymentSpent",
      "TakerPaymentSpendConfirmStarted",
      "TakerPaymentSpendConfirmed",
      "Finished"
   ],
   "my_order_uuid" : "6ea2ef0f-ad12-4100-b797-e95d726426d2",
   "gui" : "mpm",
   "taker_amount" : "337.696787706072515",
   "type" : "Maker",
   "taker_coin" : "KMD",
   "events" : [
      {
         "event" : {
            "data" : {
               "error" : "maker_swap:315] !check_balance_for_maker_swap maker_swap:1508] Not sufficient balance: lp_swap:561] The total required DASH amount 2.81827142 is larger than available 2.81823405, balance: 2.81823405, locked by swaps: 0"
            },
            "type" : "StartFailed"
         },
         "timestamp" : 1616442657218
      },
      {
         "timestamp" : 1616442657218,
         "event" : {
            "type" : "Finished"
         }
      }
   ],
   "maker_coin" : "DASH"
}

i was maker and this is my DASH address: https://chainz.cryptoid.info/dash/address.dws?XtZ1a6kWyiwjc4pwjS6cwoDSr6vm6hWmiy.htm

console on maker showed this:

22 19:50:57, mm2src/lp_ordermatch.rs:2172] INFO Entering the maker_swap_loop DASH/KMD with uuid: 6982ecbe-9929-4819-8db4-d3ddda29a933
22 19:50:57, mm2src/gossipsub/src/behaviour.rs:191] INFO Subscribed to topic: swap/6982ecbe-9929-4819-8db4-d3ddda29a933
22 19:50:57, mm2src/database/stats_swaps.rs:113] ERROR Error maker_swap:1299] First swap event must be Started on getting swap 6982ecbe-9929-4819-8db4-d3ddda29a933 data
· 2021-03-22 19:50:57 +0000 [swap uuid=6982ecbe-9929-4819-8db4-d3ddda29a933] Finished

[artemii235]

The problem with DASH can be it uses a dynamic fee - if it increases between order creation and swap start it can lead to this error. I'm unsure if we can eliminate this error completely but will check what we can do to at least reduce the possibility.

[cipig]

with latest mm2:
https://dexapi.cipig.net/public/error.php?uuid=5cacaa65-f170-4d84-99b0-927c55a2b1a3

maker_swap:516] !check_balance_for_maker_swap check_balance:75] Not enough LTC-segwit for swap: available 0.183626609, required at least 1.652657281, locked by swaps Some(BigDecimal("1.652657281"))

i guess it's because mm2 used the LTC in some other swap that was running in parallel