vFW and vDNS support added to azure-plugin

[multicloud/azure.git] / azure / aria / aria-extension-cloudify / src / aria / aria / parser / consumption / consumer.py

diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/parser/consumption/consumer.py b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/consumption/consumer.py
new file mode 100644 (file)
index 0000000..878a161
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+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/consumption/consumer.py
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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)