feat : add datasource sql and csv for webapp

apps/candlestick-patterns/app.py

@@ -479,6 +479,19 @@ def section_summary(text: str):
                                                         ),
                                                     ]
                                                 ),
+                                                dbc.Col(
+                                                    children=[
+                                                        html.Label("Source:"),
+                                                        dcc.Dropdown(
+                                                            id="datasource",
+                                                            options=[{"value": 'yahoo', "label": 'yahoo'},
+                                                                     {"value": 'csv', "label": 'csv'},
+                                                                     {"value": 'csv_all', "label": 'csv_all'},
+                                                                     {"value": 'sql', "label": 'sql'}],
+                                                            value='csv',
+                                                        ),
+                                                    ]
+                                                ),
                                             ],
                                         ),
                                         html.Label("Filter period:"),
@@ -906,8 +919,26 @@ def section_summary(text: str):
 )
 
 
+data_mode = 'sql'
+df_all_symbol = None
+sql_dal = None
+
+
 @cache.memoize()
 def fetch_data(symbol, period, interval, auto_adjust, back_adjust):
+    """Fetch OHLCV data from backend."""
+    global data_mode
+    if data_mode == 'csv_all':
+        return fetch_data_csv_all(symbol, period, interval, auto_adjust, back_adjust)
+    elif data_mode == 'csv':
+        return fetch_data_csv(symbol, period, interval, auto_adjust, back_adjust)
+    elif data_mode == 'sql':
+        return fetch_data_sql(symbol, period, interval, auto_adjust, back_adjust)
+    return fetch_data_yf(symbol, period, interval, auto_adjust, back_adjust)
+
+
+@cache.memoize()
+def fetch_data_yf(symbol, period, interval, auto_adjust, back_adjust):
     """Fetch OHLCV data from Yahoo! Finance."""
     df = yf.Ticker(symbol).history(
         period=period,
@@ -921,6 +952,73 @@ def fetch_data(symbol, period, interval, auto_adjust, back_adjust):
     return df
 
 
+@cache.memoize()
+def fetch_data_csv(symbol, period, interval, auto_adjust, back_adjust, csvdir='~/trade/data/kaggle_allUS_daily_with_volume_yahoo/stocks'):
+    """Fetch OHLCV data from csv containing one symbols."""
+    csvfile = csvdir + '/' + symbol + '.csv'
+    _start = time.perf_counter()
+    df = pd.read_csv(csvfile, parse_dates=['Date'], index_col='Date')
+    _duration = time.perf_counter() - _start
+    return df
+
+
+@cache.memoize()
+def fetch_data_csv_all(symbol, period, interval, auto_adjust, back_adjust, csvfile='~/trade/data/test.csv'):
+    """Fetch OHLCV data from csv containing multiple symbols."""
+    global df_all_symbol
+    csvfile = '~/trade/data/test.csv'
+    if df_all_symbol is None:
+        _start = time.perf_counter()
+        df_all_symbol = pd.read_csv(csvfile, parse_dates=['date'])
+        df_all_symbol = df_all_symbol.rename(
+            columns={"date": "Date", "open": "Open", "high": "High", "low": "Low", "close": "Close",
+                     "volume": "Volume"})
+        df_all_symbol['Date'] = df_all_symbol['Date'].map(
+            lambda t: pd.to_datetime(t.replace(tzinfo=None)).to_pydatetime())
+        df_all_symbol = df_all_symbol.set_index(pd.DatetimeIndex(df_all_symbol['Date']))
+        _duration = time.perf_counter() - _start
+    res = df_all_symbol[df_all_symbol['symbol'] == symbol]
+    res = res.drop(['symbol'], axis=1)
+    return res
+
+
+@cache.memoize()
+def fetch_data_sql(symbol, period, interval, auto_adjust, back_adjust):
+    """Fetch OHLCV data from SQL."""
+    global sql_dal
+    if interval == '60m':
+        dbtableRead = 'stock_market.ohlcv_1_hour'
+    elif interval == '15m':
+        dbtableRead = 'stock_market.ohlcv_15_minute'
+    elif interval == '1d':
+        dbtableRead = 'stock_market.ohlcv_1_day'
+    else:
+        raise(ValueError(f"error unknown interval {interval}"))
+    if sql_dal is None:
+        user = getpass.getuser()
+        password = os.getenv('pg_password')
+        sql_dal = MarketDataRepository()
+        sql_dal.init(user=user, password=password)
+    res = sql_dal.get_one_symbol(dbtableRead, symbol)
+    res = res.rename(
+        columns={"date": "Date", "open": "Open", "high": "High", "low": "Low", "close": "Close",
+                 "volume": "Volume"})
+    return res
+
+
+@app.callback(
+    [Output('clean_button', 'children')],
+    [Input('clean_button', 'n_clicks')],
+    prevent_initial_call=True
+)
+def clean_cache(_):
+    """Clean all data in cache."""
+    files = glob.glob('data/*')
+    for f in files:
+        os.remove(f)
+    return
+
+
 @app.callback(
     [
         Output("data_signal", "children"),

apps/candlestick-patterns/dal_stock_sql/dal.py

@@ -0,0 +1,126 @@
+import datetime as dt
+import psycopg2
+from psycopg2 import pool
+import pandas as pd
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class MarketDataRepository:
+    def __init__(self):
+        """Initialize basic structure but don't connect yet"""
+        self.connection_pool = None
+        self.ver_twsapi = None
+
+    def init(self, database='postgres', user='admin', password='admin', host='127.0.0.1', port='5432',
+             ver_twsapi=10, maxconn=2):
+        self.ver_twsapi = ver_twsapi
+        # Establishing the connection
+        logger.info('connecting to host %s and DB %s' % (host, database))
+        self.connection_pool = psycopg2.pool.ThreadedConnectionPool(
+            1, maxconn,  # minconn, maxconn
+            user=user,
+            password=password,
+            host=host,
+            port=port,
+            database=database
+        )
+
+    def get_connection(self):
+        try:
+            conn = self.connection_pool.getconn()
+        except Exception as e:
+            raise e
+        return conn
+
+    def release_connection(self, connection):
+        self.connection_pool.putconn(connection)
+
+    def end(self):
+        self.connection_pool.closeall()
+
+    def get_all_symbol(self, dbtable: str, date_start: dt = None, date_end: dt = None):
+        if None not in [date_start, date_end]:
+            sql = '''SELECT * FROM %s WHERE date >= to_timestamp(%s) AND date <= to_timestamp(%s);''' % \
+                  (dbtable, date_start.strftime('%s'), date_end.strftime('%s'))
+        elif date_start == date_end:
+            sql = '''SELECT * FROM %s ;''' % (dbtable)
+            print(sql)
+        elif date_end is None:
+            sql = '''SELECT * FROM %s WHERE date >= to_timestamp(%s);''' % \
+                  (dbtable, date_start.strftime('%s'))
+        else:
+            sql = '''SELECT * FROM %s WHERE date <= to_timestamp(%s);''' % \
+                  (dbtable, date_end.strftime('%s'))
+        # pandas only supports SQLAlchemy connectable (engine/connection) or database string URI or sqlite3 DBAPI2 connection. Other DBAPI2 objects are not tested. Please consider using SQLAlchemy.
+        conn = self.get_connection()
+        try:
+            with conn.cursor() as cursor:
+                cursor.execute(sql)
+                result = cursor.fetchall()
+                columns = [desc[0] for desc in cursor.description]
+                cursor.close()
+                df = pd.DataFrame(result, columns=columns)
+                # Specify the types directly at DataFrame creation
+                df = df.astype({
+                    'date': 'datetime64[ns, UTC]',
+                    'open': 'float',
+                    'high': 'float',
+                    'low': 'float',
+                    'close': 'float',
+                    'volume': 'int'
+                })
+        except Exception as e:
+            raise e
+        finally:
+            self.release_connection(conn)
+        # remove TZ otherwise pandas DateTimeIndex lookup in pandas do not work
+        #df['date'] = df['date'].map(lambda t: pd.to_datetime(t.replace(tzinfo=None)).to_pydatetime())
+        df = df.set_index(pd.DatetimeIndex(df['date']))
+        return df
+
+    def get_one_symbol(self, dbtable: str, symbol: str, date_start: dt = None, date_end: dt = None):
+        if ':' not in symbol:
+            logger.error('Incorrect symbol %s' % symbol)
+            return
+            # raise ValueError
+        if None not in [date_start, date_end]:
+            sql = '''SELECT * FROM %s WHERE symbol = '%s' AND date >= to_timestamp(%s) AND date <= to_timestamp(%s);''' % \
+                  (dbtable, symbol, date_start.strftime('%s'), date_end.strftime('%s'))
+        elif date_start == date_end:
+            sql = '''SELECT * FROM %s WHERE symbol = '%s';''' % (dbtable, symbol)
+            print(sql)
+        elif date_end is None:
+            sql = '''SELECT * FROM %s WHERE symbol = '%s' AND date >= to_timestamp(%s);''' % \
+                  (dbtable, symbol, date_start.strftime('%s'))
+        else:
+            sql = '''SELECT * FROM %s WHERE symbol = '%s' AND date <= to_timestamp(%s);''' % \
+                  (dbtable, symbol, date_end.strftime('%s'))
+        # pandas only supports SQLAlchemy connectable (engine/connection) or database string URI or sqlite3 DBAPI2 connection. Other DBAPI2 objects are not tested. Please consider using SQLAlchemy.
+        conn = self.get_connection()
+        try:
+            with conn.cursor() as cursor:
+                cursor.execute(sql)
+                result = cursor.fetchall()
+                columns = [desc[0] for desc in cursor.description]
+                cursor.close()
+                df = pd.DataFrame(result, columns=columns)
+                # Specify the types directly at DataFrame creation
+                df = df.astype({
+                    'date': 'datetime64[ns, UTC]',
+                    'open': 'float',
+                    'high': 'float',
+                    'low': 'float',
+                    'close': 'float',
+                    'volume': 'int'
+                })
+        except Exception as e:
+            raise e
+        finally:
+            self.release_connection(conn)
+        # remove TZ otherwise pandas DateTimeIndex lookup in pandas do not work
+        #df['date'] = df['date'].map(lambda t: pd.to_datetime(t.replace(tzinfo=None)).to_pydatetime())
+        df = df.set_index(pd.DatetimeIndex(df['date']))
+        return df