Merge branch 'develop' of github.com:enigmampc/catalyst into develop

catalyst/exchange/exchange_algorithm.py

@@ -40,7 +40,8 @@ from catalyst.exchange.exchange_utils import (
     group_assets_by_exchange, )
 from catalyst.exchange.live_graph_clock import LiveGraphClock
 from catalyst.exchange.simple_clock import SimpleClock
-from catalyst.exchange.stats_utils import get_pretty_stats, stats_to_s3
+from catalyst.exchange.stats_utils import get_pretty_stats, stats_to_s3, \
+    stats_to_algo_folder
 from catalyst.finance.execution import MarketOrder
 from catalyst.finance.performance.period import calc_period_stats
 from catalyst.gens.tradesimulation import AlgorithmSimulator
@@ -64,6 +65,8 @@ class ExchangeTradingAlgorithmBase(TradingAlgorithm):
 
         super(ExchangeTradingAlgorithmBase, self).__init__(*args, **kwargs)
 
+        self.current_day = None
+
         if self.simulate_orders is None \
                 and self.sim_params.arena == 'backtest':
             self.simulate_orders = True
@@ -284,6 +287,8 @@ class ExchangeTradingAlgorithmBacktest(ExchangeTradingAlgorithmBase):
             )
             self.frame_stats.append(frame_stats)
 
+        self.current_day = data.current_dt.floor('1D')
+
     def _create_stats_df(self):
         stats = pd.DataFrame(self.frame_stats)
         stats.set_index('period_close', inplace=True, drop=False)
@@ -311,7 +316,7 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         self.stats_output = kwargs.pop('stats_output', None)
 
         self._clock = None
-        self.frame_stats = deque(maxlen=60)
+        self.frame_stats = list()
 
         self.pnl_stats = get_algo_df(self.algo_namespace, 'pnl_stats')
 
@@ -329,7 +334,7 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         self.retry_order = 2
         self.retry_delay = 5
 
-        self.stats_minutes = 20
+        self.stats_minutes = 10
 
         super(ExchangeTradingAlgorithmLive, self).__init__(*args, **kwargs)
 
@@ -441,27 +446,49 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         return self.perf_tracker.get_account(False)
 
     def synchronize_portfolio(self, attempt_index=0):
+        """
+        Synchronizes the portfolio tracked by the algorithm to refresh
+        its current value.
+
+        This includes updating the last_sale_price of all tracked
+        positions, returning the available cash, and raising error
+        if the data goes out of sync.
+
+        Parameters
+        ----------
+        attempt_index: int
+
+        Returns
+        -------
+        float
+            The amount of base currency available for trading.
+
+        float
+            The total value of all tracked positions.
+
+        """
         tracker = self.perf_tracker.position_tracker
         total_cash = 0.0
         total_positions_value = 0.0
 
         try:
             # Position keys correspond to assets
-            assets = list(tracker.positions)
+            positions = self.portfolio.positions
+            assets = list(positions)
             exchange_assets = group_assets_by_exchange(assets)
             for exchange_name in self.exchanges:
                 assets = exchange_assets[exchange_name] \
                     if exchange_name in exchange_assets else []
 
                 exchange_positions = \
-                    [tracker.positions[asset] for asset in assets]
+                    [positions[asset] for asset in assets]
 
                 exchange = self.exchanges[exchange_name]  # Type: Exchange
                 cash, positions_value = \
                     exchange.calculate_totals(exchange_positions)
 
                 total_cash += cash
-                total_positions_value += total_positions_value
+                total_positions_value += positions_value
 
                 for position in exchange_positions:
                     tracker.update_position(
@@ -474,6 +501,7 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
                 raise ValueError('Cash on exchanges is lower than the algo.')
 
             return total_cash, total_positions_value
+
         except ExchangeRequestError as e:
             log.warn(
                 'update portfolio attempt {}: {}'.format(attempt_index, e)
@@ -577,6 +605,11 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         if not self.is_running:
             return
 
+        # Resetting the frame stats every day to minimize memory footprint
+        today = data.current_dt.floor('1D')
+        if self.current_day is not None and today > self.current_day:
+            self.frame_stats = list()
+
         new_transactions, new_commissions, closed_orders = \
             self.blotter.get_transactions(data)
 
@@ -629,7 +662,6 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
                     )
                 ))
 
-            today = pd.to_datetime('today', utc=True)
             daily_stats = self.prepare_period_stats(
                 start_dt=today,
                 end_dt=pd.Timestamp.utcnow()
@@ -643,6 +675,17 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         except Exception as e:
             log.warn('unable to calculate performance: {}'.format(e))
 
+        csv_bytes = None
+        try:
+            csv_bytes = stats_to_algo_folder(
+                stats=self.frame_stats,
+                algo_namespace=self.algo_namespace,
+                recorded_cols=recorded_cols,
+            )
+
+        except Exception as e:
+            log.warn('unable save stats locally: {}'.format(e))
+
         try:
             if self.stats_output is not None:
                 if 's3://' in self.stats_output:
@@ -651,14 +694,17 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
                         stats=self.frame_stats,
                         algo_namespace=self.algo_namespace,
                         recorded_cols=recorded_cols,
+                        bytes_to_write=csv_bytes
                     )
 
                 else:
                     raise ValueError(
                         'Only S3 stats output is supported for now.'
                     )
+
         except Exception as e:
-            log.warn('unable save stats: {}'.format(e))
+            log.warn('unable save stats externally: {}'.format(e))
+
         # TODO: pickle does not seem to work in python 3
         try:
             save_algo_object(
@@ -669,6 +715,8 @@ class ExchangeTradingAlgorithmLive(ExchangeTradingAlgorithmBase):
         except Exception as e:
             log.warn('unable to save minute perfs to disk: {}'.format(e))
 
+        self.current_day = data.current_dt.floor('1D')
+
     @api_method
     def batch_market_order(self, share_counts):
         raise NotImplementedError()