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# 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.
from ...exceptions import AriaException
from ...utils.exceptions import print_exception
from ..validation import Issue
class Consumer(object):
"""
Base class for ARIA consumers.
Consumers provide useful functionality by consuming presentations.
"""
def __init__(self, context):
from ...orchestrator import topology
self.topology = topology.Topology()
self.context = context
def consume(self):
pass
def dump(self):
pass
def _handle_exception(self, e):
if hasattr(e, 'issue') and isinstance(e.issue, Issue):
self.context.validation.report(issue=e.issue)
else:
self.context.validation.report(exception=e)
if not isinstance(e, AriaException):
print_exception(e)
class ConsumerChain(Consumer):
"""
ARIA consumer chain.
Calls consumers in order, handling exception by calling ``_handle_exception`` on them, and stops
the chain if there are any validation issues.
"""
def __init__(self, context, consumer_classes=None, handle_exceptions=True):
super(ConsumerChain, self).__init__(context)
self.handle_exceptions = handle_exceptions
self.consumers = []
if consumer_classes:
for consumer_class in consumer_classes:
self.append(consumer_class)
def append(self, *consumer_classes):
for consumer_class in consumer_classes:
self.consumers.append(consumer_class(self.context))
def consume(self):
for consumer in self.consumers:
try:
consumer.consume()
except BaseException as e:
if self.handle_exceptions:
handle_exception(consumer, e)
else:
raise e
if consumer.topology.has_issues:
self.context.validation.extend_issues(consumer.topology.issues)
if self.context.validation.has_issues:
break
def handle_exception(consumer, e):
if isinstance(e, AriaException) and e.issue:
consumer.context.validation.report(issue=e.issue)
else:
consumer.context.validation.report(exception=e)
if not isinstance(e, AriaException):
print_exception(e)
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