stable/freqtrade/freqai/data_drawer.py

import json
import logging
from pathlib import Path
from typing import Any, Dict, Tuple

# import pickle as pk
import numpy as np


logger = logging.getLogger(__name__)


class FreqaiDataDrawer:
    """
    Class aimed at holding all pair models/info in memory for better inferencing/retrainig/saving
    /loading to/from disk.
    This object remains persistent throughout live/dry, unlike FreqaiDataKitchen, which is
    reinstantiated for each coin.
    """
    def __init__(self, full_path: Path):

        # dictionary holding all pair metadata necessary to load in from disk
        self.pair_dict: Dict[str, Any] = {}
        # dictionary holding all actively inferenced models in memory given a model filename
        self.model_dictionary: Dict[str, Any] = {}
        self.pair_data_dict: Dict[str, Any] = {}
        self.full_path = full_path
        self.load_drawer_from_disk()

    def load_drawer_from_disk(self):
        exists = Path(self.full_path / str('pair_dictionary.json')).resolve().exists()
        if exists:
            with open(self.full_path / str('pair_dictionary.json'), "r") as fp:
                self.pair_dict = json.load(fp)
        else:
            logger.info("Could not find existing datadrawer, starting from scratch")
        return exists

    def save_drawer_to_disk(self):
        with open(self.full_path / str('pair_dictionary.json'), "w") as fp:
            json.dump(self.pair_dict, fp, default=self.np_encoder)

    def np_encoder(self, object):
        if isinstance(object, np.generic):
            return object.item()

    def get_pair_dict_info(self, metadata: dict) -> Tuple[str, int, bool]:
        pair_in_dict = self.pair_dict.get(metadata['pair'])
        if pair_in_dict:
            model_filename = self.pair_dict[metadata['pair']]['model_filename']
            trained_timestamp = self.pair_dict[metadata['pair']]['trained_timestamp']
            coin_first = self.pair_dict[metadata['pair']]['first']
        else:
            self.pair_dict[metadata['pair']] = {}
            model_filename = self.pair_dict[metadata['pair']]['model_filename'] = ''
            coin_first = self.pair_dict[metadata['pair']]['first'] = True
            trained_timestamp = self.pair_dict[metadata['pair']]['trained_timestamp'] = 0

        return model_filename, trained_timestamp, coin_first