Add ohlcv_get_available_data to find available data

freqtrade/data/history/idatahandler.py

@@ -13,6 +13,7 @@ from typing import List, Optional, Type
 from pandas import DataFrame
 
 from freqtrade.configuration import TimeRange
+from freqtrade.constants import ListPairsWithTimeframes
 from freqtrade.data.converter import (clean_ohlcv_dataframe,
                                       trades_remove_duplicates, trim_dataframe)
 from freqtrade.exchange import timeframe_to_seconds
@@ -28,6 +29,14 @@ class IDataHandler(ABC):
     def __init__(self, datadir: Path) -> None:
         self._datadir = datadir
 
+    @abstractclassmethod
+    def ohlcv_get_available_data(cls, datadir: Path) -> ListPairsWithTimeframes:
+        """
+        Returns a list of all pairs with ohlcv data available in this datadir
+        :param datadir: Directory to search for ohlcv files
+        :return: List of Pair
+        """
+
     @abstractclassmethod
     def ohlcv_get_pairs(cls, datadir: Path, timeframe: str) -> List[str]:
         """

freqtrade/data/history/jsondatahandler.py

@@ -8,7 +8,8 @@ from pandas import DataFrame, read_json, to_datetime
 
 from freqtrade import misc
 from freqtrade.configuration import TimeRange
-from freqtrade.constants import DEFAULT_DATAFRAME_COLUMNS
+from freqtrade.constants import (DEFAULT_DATAFRAME_COLUMNS,
+                                 ListPairsWithTimeframes)
 from freqtrade.data.converter import trades_dict_to_list
 
 from .idatahandler import IDataHandler, TradeList
@@ -21,6 +22,17 @@ class JsonDataHandler(IDataHandler):
     _use_zip = False
     _columns = DEFAULT_DATAFRAME_COLUMNS
 
+    @classmethod
+    def ohlcv_get_available_data(cls, datadir: Path) -> ListPairsWithTimeframes:
+        """
+        Returns a list of all pairs with ohlcv data available in this datadir
+        :param datadir: Directory to search for ohlcv files
+        :return: List of Pair
+        """
+        _tmp = [re.search(r'^([a-zA-Z_]+)\-(\S+)(?=.json)', p.name)
+                for p in datadir.glob(f"*.{cls._get_file_extension()}")]
+        return [(match[1].replace('_', '/'), match[2]) for match in _tmp if len(match.groups()) > 1]
+
     @classmethod
     def ohlcv_get_pairs(cls, datadir: Path, timeframe: str) -> List[str]:
         """