added fix for insufficient funds error from bitrex, looking at possibility to test it it

freqtrade/__init__.py

@@ -14,3 +14,10 @@ class OperationalException(BaseException):
     Requires manual intervention.
     This happens when an exchange returns an unexpected error during runtime.
     """
+
+
+class NotEnoughFundsExeption(BaseException):
+    """
+    This happens when the exchange reports that not enough funds where available. We do not want to stop
+    the bot in this case and just keep it going and suppress this message
+    """

freqtrade/exchange/bittrex.py

@@ -5,7 +5,7 @@ from bittrex.bittrex import API_V1_1, API_V2_0
 from bittrex.bittrex import Bittrex as _Bittrex
 from requests.exceptions import ContentDecodingError
 
-from freqtrade import OperationalException
+from freqtrade import OperationalException, NotEnoughFundsExeption
 from freqtrade.exchange.interface import Exchange
 
 logger = logging.getLogger(__name__)
@@ -63,6 +63,14 @@ class Bittrex(Exchange):
         data = _API.buy_limit(pair.replace('_', '-'), amount, rate)
         if not data['success']:
             Bittrex._validate_response(data)
+
+            if data['message'] == "INSUFFICIENT_FUNDS":
+                raise NotEnoughFundsExeption('{message} params=({pair}, {rate}, {amount})'.format(
+                    message=data['message'],
+                    pair=pair,
+                    rate=rate,
+                    amount=amount))
+            else:
                 raise OperationalException('{message} params=({pair}, {rate}, {amount})'.format(
                     message=data['message'],
                     pair=pair,

freqtrade/freqtradebot.py

@@ -15,8 +15,8 @@ import requests
 from cachetools import cached, TTLCache
 
 from freqtrade import (
-    DependencyException, OperationalException, exchange, persistence, __version__
-)
+    DependencyException, OperationalException, exchange, persistence, __version__,
+    NotEnoughFundsExeption)
 from freqtrade.analyze import Analyze
 from freqtrade import constants
 from freqtrade.fiat_convert import CryptoToFiatConverter
@@ -24,7 +24,6 @@ from freqtrade.persistence import Trade
 from freqtrade.rpc.rpc_manager import RPCManager
 from freqtrade.state import State
 
-
 logger = logging.getLogger(__name__)
 
 
@@ -166,7 +165,11 @@ class FreqtradeBot(object):
 
             # Then looking for buy opportunities
             if len(trades) < self.config['max_open_trades']:
+                try:
                     state_changed = self.process_maybe_execute_buy()
+                except NotEnoughFundsExeption:
+                    logger.warning('insufficient funds to execute this buy order, ignoring it!')
+                    state_changed = False
 
             if 'unfilledtimeout' in self.config:
                 # Check and handle any timed out open orders
@@ -176,6 +179,7 @@ class FreqtradeBot(object):
         except (requests.exceptions.RequestException, json.JSONDecodeError) as error:
             logger.warning('%s, retrying in 30 seconds...', error)
             time.sleep(constants.RETRY_TIMEOUT)
+
         except OperationalException:
             self.rpc.send_msg(
                 '*Status:* OperationalException:\n```\n{traceback}```{hint}'