# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.    


"""
Custom exceptions used in the `resdb_validator` package.
"""
class ResDBError(Exception):
    """Base class for ResDB exceptions."""


class ConfigurationError(ResDBError):
    """Raised when there is a problem with server configuration"""


class DatabaseDoesNotExist(ResDBError):
    """Raised when trying to delete the database but the db is not there"""


class StartupError(ResDBError):
    """Raised when there is an error starting up the system"""


class CyclicBlockchainError(ResDBError):
    """Raised when there is a cycle in the blockchain"""


class KeypairMismatchException(ResDBError):
    """Raised if the private key(s) provided for signing don't match any of the
    current owner(s)
    """


class OperationError(ResDBError):
    """Raised when an operation cannot go through"""


################################################################################
# Validation errors
#
# All validation errors (which are handleable errors, not faults) should
# subclass ValidationError. However, where possible they should also have their
# own distinct type to differentiate them from other validation errors,
# especially for the purposes of testing.


class ValidationError(ResDBError):
    """Raised if there was an error in validation"""


class DoubleSpend(ValidationError):
    """Raised if a double spend is found"""


class InvalidHash(ValidationError):
    """Raised if there was an error checking the hash for a particular
    operation
    """


class SchemaValidationError(ValidationError):
    """Raised if there was any error validating an object's schema"""


class InvalidSignature(ValidationError):
    """Raised if there was an error checking the signature for a particular
    operation
    """


class AssetIdMismatch(ValidationError):
    """Raised when multiple transaction inputs related to different assets"""


class AmountError(ValidationError):
    """Raised when there is a problem with a transaction's output amounts"""


class InputDoesNotExist(ValidationError):
    """Raised if a transaction input does not exist"""


class TransactionOwnerError(ValidationError):
    """Raised if a user tries to transfer a transaction they don't own"""


class DuplicateTransaction(ValidationError):
    """Raised if a duplicated transaction is found"""


class ThresholdTooDeep(ValidationError):
    """Raised if threshold condition is too deep"""


class MultipleValidatorOperationError(ValidationError):
    """Raised when a validator update pending but new request is submited"""


class MultipleInputsError(ValidationError):
    """Raised if there were multiple inputs when only one was expected"""


class InvalidProposer(ValidationError):
    """Raised if the public key is not a part of the validator set"""


class UnequalValidatorSet(ValidationError):
    """Raised if the validator sets differ"""


class InvalidPowerChange(ValidationError):
    """Raised if proposed power change in validator set is >=1/3 total power"""


class InvalidPublicKey(ValidationError):
    """Raised if public key doesn't match the encoding type"""