import logging from typing import Any, Dict from jsonschema import Draft4Validator, validators from jsonschema.exceptions import ValidationError, best_match from freqtrade import constants, OperationalException from freqtrade.state import RunMode logger = logging.getLogger(__name__) def _extend_validator(validator_class): """ Extended validator for the Freqtrade configuration JSON Schema. Currently it only handles defaults for subschemas. """ validate_properties = validator_class.VALIDATORS['properties'] def set_defaults(validator, properties, instance, schema): for prop, subschema in properties.items(): if 'default' in subschema: instance.setdefault(prop, subschema['default']) for error in validate_properties( validator, properties, instance, schema, ): yield error return validators.extend( validator_class, {'properties': set_defaults} ) FreqtradeValidator = _extend_validator(Draft4Validator) def validate_config_schema(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: FreqtradeValidator(constants.CONF_SCHEMA).validate(conf) return conf except ValidationError as e: logger.critical( f"Invalid configuration. See config.json.example. Reason: {e}" ) raise ValidationError( best_match(Draft4Validator(constants.CONF_SCHEMA).iter_errors(conf)).message ) def validate_config_consistency(conf: Dict[str, Any]) -> None: """ Validate the configuration consistency. Should be ran after loading both configuration and strategy, since strategies can set certain configuration settings too. :param conf: Config in JSON format :return: Returns None if everything is ok, otherwise throw an OperationalException """ # validate configuration before returning logger.info('Validating configuration ...') validate_config_schema(conf) # validating trailing stoploss _validate_trailing_stoploss(conf) _validate_edge(conf) _validate_whitelist(conf) def _validate_trailing_stoploss(conf: Dict[str, Any]) -> None: if conf.get('stoploss') == 0.0: raise OperationalException( 'The config stoploss needs to be different from 0 to avoid problems with sell orders.' ) # Skip if trailing stoploss is not activated if not conf.get('trailing_stop', False): return tsl_positive = float(conf.get('trailing_stop_positive', 0)) tsl_offset = float(conf.get('trailing_stop_positive_offset', 0)) tsl_only_offset = conf.get('trailing_only_offset_is_reached', False) if tsl_only_offset: if tsl_positive == 0.0: raise OperationalException( 'The config trailing_only_offset_is_reached needs ' 'trailing_stop_positive_offset to be more than 0 in your config.') if tsl_positive > 0 and 0 < tsl_offset <= tsl_positive: raise OperationalException( 'The config trailing_stop_positive_offset needs ' 'to be greater than trailing_stop_positive in your config.') # Fetch again without default if 'trailing_stop_positive' in conf and float(conf['trailing_stop_positive']) == 0.0: raise OperationalException( 'The config trailing_stop_positive needs to be different from 0 ' 'to avoid problems with sell orders.' ) def _validate_edge(conf: Dict[str, Any]) -> None: """ Edge and Dynamic whitelist should not both be enabled, since edge overrides dynamic whitelists. """ if not conf.get('edge', {}).get('enabled'): return if conf.get('pairlist', {}).get('method') == 'VolumePairList': raise OperationalException( "Edge and VolumePairList are incompatible, " "Edge will override whatever pairs VolumePairlist selects." ) def _validate_whitelist(conf: Dict[str, Any]) -> None: """ Dynamic whitelist does not require pair_whitelist to be set - however StaticWhitelist does. """ if conf.get('runmode', RunMode.OTHER) in [RunMode.OTHER, RunMode.PLOT, RunMode.UTIL_NO_EXCHANGE, RunMode.UTIL_EXCHANGE]: return for pl in conf.get('pairlists', [{'method': 'StaticPairList'}]): if (pl.get('method') == 'StaticPairList' and not conf.get('exchange', {}).get('pair_whitelist')): raise OperationalException("StaticPairList requires pair_whitelist to be set.")