mirror of https://github.com/docker/compose.git
Improve error messages from oneOf schema errors
oneOf schema ValidationError takes a little more work to parse and pull out more detail so we can give a better error message back to the user. Signed-off-by: Mazz Mosley <mazz@houseofmnowster.com>
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@ -107,16 +107,6 @@ def process_errors(errors, service_name=None):
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def _clean_error_message(message):
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return message.replace("u'", "'")
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def _parse_valid_types_from_schema(schema):
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"""
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Our defined types using $ref in the schema require some extra parsing
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retrieve a helpful type for error message display.
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"""
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if '$ref' in schema:
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return schema['$ref'].replace("#/definitions/", "").replace("_", " ")
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else:
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return str(schema['type'])
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def _parse_valid_types_from_validator(validator):
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"""
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A validator value can be either an array of valid types or a string of
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@ -149,6 +139,39 @@ def process_errors(errors, service_name=None):
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return msg
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def _parse_oneof_validator(error):
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"""
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oneOf has multiple schemas, so we need to reason about which schema, sub
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schema or constraint the validation is failing on.
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Inspecting the context value of a ValidationError gives us information about
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which sub schema failed and which kind of error it is.
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"""
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constraint = [context for context in error.context if len(context.path) > 0]
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if constraint:
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valid_types = _parse_valid_types_from_validator(constraint[0].validator_value)
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msg = "contains {}, which is an invalid type, it should be {}".format(
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constraint[0].instance,
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valid_types
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)
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return msg
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uniqueness = [context for context in error.context if context.validator == 'uniqueItems']
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if uniqueness:
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msg = "contains non unique items, please remove duplicates from {}".format(
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uniqueness[0].instance
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)
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return msg
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types = [context.validator_value for context in error.context if context.validator == 'type']
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if len(types) == 1:
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valid_types = _parse_valid_types_from_validator(types[0])
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else:
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valid_types = _parse_valid_types_from_validator(types)
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msg = "contains an invalid type, it should be {}".format(valid_types)
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return msg
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root_msgs = []
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invalid_keys = []
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required = []
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@ -200,12 +223,10 @@ def process_errors(errors, service_name=None):
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required.append(_clean_error_message(error.message))
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elif error.validator == 'oneOf':
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config_key = error.path[0]
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msg = _parse_oneof_validator(error)
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valid_types = [_parse_valid_types_from_schema(schema) for schema in error.schema['oneOf']]
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valid_type_msg = " or ".join(valid_types)
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type_errors.append("Service '{}' configuration key '{}' contains an invalid type, valid types are {}".format(
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service_name, config_key, valid_type_msg)
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type_errors.append("Service '{}' configuration key '{}' {}".format(
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service_name, config_key, msg)
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)
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elif error.validator == 'type':
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msg = _parse_valid_types_from_validator(error.validator_value)
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@ -183,7 +183,8 @@ class ConfigTest(unittest.TestCase):
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)
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def test_invalid_list_of_strings_format(self):
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expected_error_msg = "'command' contains an invalid type, valid types are string or array"
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expected_error_msg = "Service 'web' configuration key 'command' contains 1"
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expected_error_msg += ", which is an invalid type, it should be a string"
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with self.assertRaisesRegexp(ConfigurationError, expected_error_msg):
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config.load(
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config.ConfigDetails(
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@ -222,7 +223,7 @@ class ConfigTest(unittest.TestCase):
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)
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def test_config_extra_hosts_list_of_dicts_validation_error(self):
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expected_error_msg = "Service 'web' configuration key 'extra_hosts' contains an invalid type"
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expected_error_msg = "key 'extra_hosts' contains {'somehost': '162.242.195.82'}, which is an invalid type, it should be a string"
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with self.assertRaisesRegexp(ConfigurationError, expected_error_msg):
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config.load(
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