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