extract backtesting abort functionality

freqtrade/optimize/backtesting.py

@@ -189,6 +189,15 @@ class Backtesting:
         self.rejected_trades = 0
         self.dataprovider.clear_cache()
 
+    def check_abort(self):
+        """
+        Check if abort was requested, raise DependencyException if that's the case
+        Only applies to Interactive backtest mode (webserver mode)
+        """
+        if self.abort:
+            self.abort = False
+            raise DependencyException("Stop requested")
+
     def _get_ohlcv_as_lists(self, processed: Dict[str, DataFrame]) -> Dict[str, Tuple]:
         """
         Helper function to convert a processed dataframes into lists for performance reasons.
@@ -203,8 +212,7 @@ class Backtesting:
 
         # Create dict with data
         for pair, pair_data in processed.items():
-            if self.abort:
-                raise DependencyException("Stop requested")
+            self.check_abort()
             self.progress.increment()
             if not pair_data.empty:
                 pair_data.loc[:, 'buy'] = 0  # cleanup if buy_signal is exist
@@ -422,8 +430,7 @@ class Backtesting:
         # Loop timerange and get candle for each pair at that point in time
         while tmp <= end_date:
             open_trade_count_start = open_trade_count
-            if self.abort:
-                raise DependencyException("Stop requested")
+            self.check_abort()
             for i, pair in enumerate(data):
                 row_index = indexes[pair]
                 try:

freqtrade/rpc/api_server/api_backtest.py

@@ -52,8 +52,8 @@ async def api_start_backtest(bt_settings: BacktestRequest, background_tasks: Bac
                 # TODO: Investigate if enabling protections can be dynamically ingested from here...
                 from freqtrade.optimize.backtesting import Backtesting
                 ApiServer._bt = Backtesting(btconfig)
-                # Reset data if backtesting is reloaded
 
+            # Only reload data if timeframe or timerange changed.
             if (not ApiServer._backtestdata or not ApiServer._bt_timerange
                     or lastconfig.get('timerange') != btconfig['timerange']
                     or lastconfig.get('timeframe') != strat.timeframe):

tests/optimize/test_backtesting.py

@@ -346,6 +346,20 @@ def test_data_to_dataframe_bt(default_conf, mocker, testdatadir) -> None:
     assert processed['UNITTEST/BTC'].equals(processed2['UNITTEST/BTC'])
 
 
+def test_backtest_abort(default_conf, mocker, testdatadir) -> None:
+    patch_exchange(mocker)
+    backtesting = Backtesting(default_conf)
+    backtesting.check_abort()
+
+    backtesting.abort = True
+
+    with pytest.raises(DependencyException, match="Stop requested"):
+        backtesting.check_abort()
+    # abort flag resets
+    assert backtesting.abort is False
+    assert backtesting.progress.progress == 0
+
+
 def test_backtesting_start(default_conf, mocker, testdatadir, caplog) -> None:
     def get_timerange(input1):
         return Arrow(2017, 11, 14, 21, 17), Arrow(2017, 11, 14, 22, 59)

tests/rpc/test_rpc_apiserver.py

@@ -1252,10 +1252,6 @@ def test_api_backtesting(botclient, mocker, fee):
     assert not result['running']
     assert result['status_msg'] == 'Backtest reset'
 
-    # bt_mock = mocker.patch('freqtrade.optimize.backtesting.Backtesting.backtest_one_strategy',
-    #                        return_value=(1, 2))
-    # stats_mock = mocker.patch('freqtrade.optimize.optimize_reports.generate_backtest_stats')
-    # bt_mock.load_bt_data = MagicMock(return_value=(xxx, 'asdfadf'))
     # start backtesting
     data = {
         "strategy": "DefaultStrategy",
@@ -1285,6 +1281,13 @@ def test_api_backtesting(botclient, mocker, fee):
     assert result['progress'] == 1
     assert result['backtest_result']
 
+    rc = client_get(client, f"{BASE_URI}/backtest/abort")
+    assert_response(rc)
+    result = rc.json()
+    assert result['status'] == 'not_running'
+    assert not result['running']
+    assert result['status_msg'] == 'Backtest ended'
+
     # Delete backtesting to avoid leakage since the backtest-object may stick around.
     rc = client_delete(client, f"{BASE_URI}/backtest")
     assert_response(rc)