stable/freqtrade/configuration.py

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"""
This module contains the configuration class
"""
import json
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import logging
from argparse import Namespace
from typing import Dict, Any
from jsonschema import Draft4Validator, validate
from jsonschema.exceptions import ValidationError, best_match
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import ccxt
from freqtrade import OperationalException, constants
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logger = logging.getLogger(__name__)
class Configuration(object):
"""
Class to read and init the bot configuration
Reuse this class for the bot, backtesting, hyperopt and every script that required configuration
"""
def __init__(self, args: Namespace) -> None:
self.args = args
self.config = None
def load_config(self) -> Dict[str, Any]:
"""
Extract information for sys.argv and load the bot configuration
:return: Configuration dictionary
"""
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logger.info('Using config: %s ...', self.args.config)
config = self._load_config_file(self.args.config)
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# Set strategy if not specified in config and or if it's non default
if self.args.strategy != constants.DEFAULT_STRATEGY or not config.get('strategy'):
config.update({'strategy': self.args.strategy})
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if self.args.strategy_path:
config.update({'strategy_path': self.args.strategy_path})
# Load Common configuration
config = self._load_common_config(config)
# Load Backtesting
config = self._load_backtesting_config(config)
# Load Hyperopt
config = self._load_hyperopt_config(config)
return config
def _load_config_file(self, path: str) -> Dict[str, Any]:
"""
Loads a config file from the given path
:param path: path as str
:return: configuration as dictionary
"""
try:
with open(path) as file:
conf = json.load(file)
except FileNotFoundError:
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logger.critical(
'Config file "%s" not found. Please create your config file',
path
)
exit(0)
if 'internals' not in conf:
conf['internals'] = {}
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logger.info('Validating configuration ...')
return self._validate_config(conf)
def _load_common_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
"""
Extract information for sys.argv and load common configuration
:return: configuration as dictionary
"""
# Log level
if 'loglevel' in self.args and self.args.loglevel:
config.update({'loglevel': self.args.loglevel})
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logging.basicConfig(
level=config['loglevel'],
format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
)
logger.info('Log level set to %s', logging.getLevelName(config['loglevel']))
# Add dynamic_whitelist if found
if 'dynamic_whitelist' in self.args and self.args.dynamic_whitelist:
config.update({'dynamic_whitelist': self.args.dynamic_whitelist})
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logger.info(
'Parameter --dynamic-whitelist detected. '
'Using dynamically generated whitelist. '
'(not applicable with Backtesting and Hyperopt)'
)
# Add dry_run_db if found and the bot in dry run
if self.args.dry_run_db and config.get('dry_run', False):
config.update({'dry_run_db': True})
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logger.info('Parameter --dry-run-db detected ...')
if config.get('dry_run_db', False):
if config.get('dry_run', False):
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logger.info('Dry_run will use the DB file: "tradesv3.dry_run.sqlite"')
else:
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logger.info('Dry run is disabled. (--dry_run_db ignored)')
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# Check if the exchange set by the user is supported
self.check_exchange(config)
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return config
def _load_backtesting_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
"""
Extract information for sys.argv and load Backtesting configuration
:return: configuration as dictionary
"""
# If -i/--ticker-interval is used we override the configuration parameter
# (that will override the strategy configuration)
if 'ticker_interval' in self.args and self.args.ticker_interval:
config.update({'ticker_interval': self.args.ticker_interval})
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logger.info('Parameter -i/--ticker-interval detected ...')
logger.info('Using ticker_interval: %s ...', config.get('ticker_interval'))
# If -l/--live is used we add it to the configuration
if 'live' in self.args and self.args.live:
config.update({'live': True})
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logger.info('Parameter -l/--live detected ...')
# If --realistic-simulation is used we add it to the configuration
if 'realistic_simulation' in self.args and self.args.realistic_simulation:
config.update({'realistic_simulation': True})
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logger.info('Parameter --realistic-simulation detected ...')
logger.info('Using max_open_trades: %s ...', config.get('max_open_trades'))
# If --timerange is used we add it to the configuration
if 'timerange' in self.args and self.args.timerange:
config.update({'timerange': self.args.timerange})
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logger.info('Parameter --timerange detected: %s ...', self.args.timerange)
# If --datadir is used we add it to the configuration
if 'datadir' in self.args and self.args.datadir:
config.update({'datadir': self.args.datadir})
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logger.info('Parameter --datadir detected: %s ...', self.args.datadir)
# If -r/--refresh-pairs-cached is used we add it to the configuration
if 'refresh_pairs' in self.args and self.args.refresh_pairs:
config.update({'refresh_pairs': True})
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logger.info('Parameter -r/--refresh-pairs-cached detected ...')
# If --export is used we add it to the configuration
if 'export' in self.args and self.args.export:
config.update({'export': self.args.export})
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logger.info('Parameter --export detected: %s ...', self.args.export)
return config
def _load_hyperopt_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
"""
Extract information for sys.argv and load Hyperopt configuration
:return: configuration as dictionary
"""
# If --realistic-simulation is used we add it to the configuration
if 'epochs' in self.args and self.args.epochs:
config.update({'epochs': self.args.epochs})
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logger.info('Parameter --epochs detected ...')
logger.info('Will run Hyperopt with for %s epochs ...', config.get('epochs'))
# If --mongodb is used we add it to the configuration
if 'mongodb' in self.args and self.args.mongodb:
config.update({'mongodb': self.args.mongodb})
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logger.info('Parameter --use-mongodb detected ...')
# If --spaces is used we add it to the configuration
if 'spaces' in self.args and self.args.spaces:
config.update({'spaces': self.args.spaces})
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logger.info('Parameter -s/--spaces detected: %s', config.get('spaces'))
return config
def _validate_config(self, conf: Dict[str, Any]) -> Dict[str, Any]:
"""
Validate the configuration follow the Config Schema
:param conf: Config in JSON format
:return: Returns the config if valid, otherwise throw an exception
"""
try:
validate(conf, constants.CONF_SCHEMA)
return conf
except ValidationError as exception:
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logger.fatal(
'Invalid configuration. See config.json.example. Reason: %s',
exception
)
raise ValidationError(
best_match(Draft4Validator(constants.CONF_SCHEMA).iter_errors(conf)).message
)
def get_config(self) -> Dict[str, Any]:
"""
Return the config. Use this method to get the bot config
:return: Dict: Bot config
"""
if self.config is None:
self.config = self.load_config()
return self.config
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def check_exchange(self, config: Dict[str, Any]) -> bool:
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"""
Check if the exchange name in the config file is supported by Freqtrade
:return: True or raised an exception if the exchange if not supported
"""
exchange = config.get('exchange', {}).get('name').lower()
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if exchange not in ccxt.exchanges:
exception_msg = 'Exchange "{}" not supported.\n' \
'The following exchanges are supported: {}'\
.format(exchange, ', '.join(ccxt.exchanges))
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logger.critical(exception_msg)
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raise OperationalException(
exception_msg
)
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logger.debug('Exchange "%s" supported', exchange)
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return True