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#!/usr/bin/env python3
##
# 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
#
# https://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.
import json
def _safe_pretty(schema):
"""Try to pretty-print a schema, but never raise an exception within another exception."""
try:
return json.dumps(json.loads(str(schema)), indent=2)
except Exception: # Never raise an exception within another exception.
return schema
class AvroException(Exception):
"""The base class for exceptions in avro."""
class InvalidAvroBinaryEncoding(AvroException):
"""For invalid numbers of bytes read."""
class SchemaParseException(AvroException):
"""Raised when a schema failed to parse."""
class InvalidName(SchemaParseException):
"""User attempted to parse a schema with an invalid name."""
class InvalidDefault(SchemaParseException):
"""User attempted to parse a schema with an invalid default."""
class AvroWarning(UserWarning):
"""Base class for warnings."""
class IgnoredLogicalType(AvroWarning):
"""Warnings for unknown or invalid logical types."""
class AvroTypeException(AvroException):
"""Raised when datum is not an example of schema."""
def __init__(self, *args):
try:
expected_schema, name, datum = args[:3]
except (IndexError, ValueError):
return super().__init__(*args)
pretty_expected = json.dumps(json.loads(str(expected_schema)), indent=2)
return super().__init__(f'The datum "{datum}" provided for "{name}" is not an example of the schema {pretty_expected}')
class InvalidDefaultException(AvroTypeException):
"""Raised when a default value isn't a suitable type for the schema."""
class AvroOutOfScaleException(AvroTypeException):
"""Raised when attempting to write a decimal datum with an exponent too large for the decimal schema."""
def __init__(self, *args):
try:
scale, datum, exponent = args[:3]
except (IndexError, ValueError):
return super().__init__(*args)
return super().__init__(f"The exponent of {datum}, {exponent}, is too large for the schema scale of {scale}")
class SchemaResolutionException(AvroException):
def __init__(self, fail_msg, writers_schema=None, readers_schema=None, *args):
writers_message = f"\nWriter's Schema: {_safe_pretty(writers_schema)}" if writers_schema else ""
readers_message = f"\nReader's Schema: {_safe_pretty(readers_schema)}" if readers_schema else ""
super().__init__((fail_msg or "") + writers_message + readers_message, *args)
class DataFileException(AvroException):
"""Raised when there's a problem reading or writing file object containers."""
class IONotReadyException(AvroException):
"""Raised when attempting an avro operation on an io object that isn't fully initialized."""
class AvroRemoteException(AvroException):
"""Raised when an error message is sent by an Avro requestor or responder."""
class ConnectionClosedException(AvroException):
"""Raised when attempting IPC on a closed connection."""
class ProtocolParseException(AvroException):
"""Raised when a protocol failed to parse."""
class UnsupportedCodec(NotImplementedError, AvroException):
"""Raised when the compression named cannot be used."""
class UsageError(RuntimeError, AvroException):
"""An exception raised when incorrect arguments were passed."""
class AvroRuntimeException(RuntimeError, AvroException):
"""Raised when compatibility parsing encounters an unknown type"""
class UnknownFingerprintAlgorithmException(AvroException):
"""Raised when attempting to generate a fingerprint with an unknown algorithm"""
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