Merge pull request #12 from vertti/stoploss

Add a stop-loss feature

README.md

@@ -33,6 +33,9 @@ See the example below:
 },
 ```
 
+`stoploss` is loss in percentage that should trigger a sale. 
+For example value `-0.10` will cause immediate sell if the
+profit dips below -10% for a given trade. This parameter is optional.
 
 The other values should be self-explanatory,
 if not feel free to raise a github issue.

config.json.example

@@ -8,6 +8,7 @@
         "720":  0.01,
         "0":  0.02
     },
+    "stoploss": -0.10,
     "poloniex": {
         "enabled": false,
         "key": "key",

main.py

@@ -138,6 +138,22 @@ def close_trade_if_fulfilled(trade: Trade) -> bool:
         return True
     return False
 
+def execute_sell(trade: Trade, current_rate: float) -> None:
+    # Get available balance
+    currency = trade.pair.split('_')[1]
+    balance = api_wrapper.get_balance(currency)
+
+    profit = trade.exec_sell_order(current_rate, balance)
+    message = '*{}:* Selling [{}]({}) at rate `{:f} (profit: {}%)`'.format(
+        trade.exchange.name,
+        trade.pair.replace('_', '/'),
+        api_wrapper.get_pair_detail_url(trade.pair),
+        trade.close_rate,
+        round(profit, 2)
+    )
+    logger.info(message)
+    TelegramHandler.send_msg(message)
+
 
 def handle_trade(trade: Trade) -> None:
     """
@@ -153,26 +169,17 @@ def handle_trade(trade: Trade) -> None:
         current_rate = api_wrapper.get_ticker(trade.pair)['bid']
         current_profit = 100 * ((current_rate - trade.open_rate) / trade.open_rate)
 
-        # Get available balance
-        currency = trade.pair.split('_')[1]
-        balance = api_wrapper.get_balance(currency)
+        if 'stoploss' in CONFIG & current_profit < float(CONFIG['stoploss'])*100:
+            logger.debug('Stop loss hit.')
+            execute_sell(trade, current_rate)
+            return
 
         for duration, threshold in sorted(CONFIG['minimal_roi'].items()):
             duration, threshold = float(duration), float(threshold)
             # Check if time matches and current rate is above threshold
             time_diff = (datetime.utcnow() - trade.open_date).total_seconds() / 60
             if time_diff > duration and current_rate > (1 + threshold) * trade.open_rate:
-                # Execute sell
-                profit = trade.exec_sell_order(current_rate, balance)
-                message = '*{}:* Selling [{}]({}) at rate `{:f} (profit: {}%)`'.format(
-                    trade.exchange.name,
-                    trade.pair.replace('_', '/'),
-                    api_wrapper.get_pair_detail_url(trade.pair),
-                    trade.close_rate,
-                    round(profit, 2)
-                )
-                logger.info(message)
-                TelegramHandler.send_msg(message)
+                execute_sell(trade, current_rate)
                 return
         else:
             logger.debug('Threshold not reached. (cur_profit: %1.2f%%)', current_profit)

utils.py

@@ -24,6 +24,7 @@ _conf_schema = {
             },
             'minProperties': 1
         },
+        'stoploss': {'type': 'number', 'maximum': 0, 'exclusiveMaximum': True},
         'poloniex': {'$ref': '#/definitions/exchange'},
         'bittrex': {'$ref': '#/definitions/exchange'},
         'telegram': {