Decouple aria parser

Use stevedore to make the aria parser as a plugin of the vnfsdk package
tool. Currently, the aria parser is still the default parser but 3rd
party developer can add other plugins as a parser to validate the csar
packages.

Change-Id: I4a1a1c5e65103fb93fa8aebf3d683781f4888ea4
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Issue-Id: VNFSDK-60

2 files changed, 92 insertions, 0 deletions

diff --git a/validator/__init__.py b/validator/__init__.py
new file mode 100644
index 0000000..d33dcdf
--- /dev/null
+++ b/validator/__init__.py
@@ -0,0 +1,49 @@
+# Copyright (c) 2017 Intel Corp. All rights reserved.
+#
+# Licensed 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.
+#
+
+import abc
+
+import six
+from stevedore import driver
+
+
+VALIDATOR_NS = "vnfsdk.validator"
+
+def get_validator(params):
+    """Get validate driver and load it.
+
+    :param params: parameters to decide which validator to load
+    """
+
+    loaded_driver = driver.DriverManager(VALIDATOR_NS,
+                                         params,
+                                         invoke_on_load=True)
+    return loaded_driver.driver
+
+
+@six.add_metaclass(abc.ABCMeta)
+class ValidatorBase(object):
+    """Base class for validators."""
+
+    def __init__(self):
+        pass
+
+
+    @abc.abstractmethod
+    def validate(self, reader):
+        """Validate the csar package.
+
+        :param reader: instance of package.csar._CSARReader
+        """
diff --git a/validator/aria_validator.py b/validator/aria_validator.py
new file mode 100644
index 0000000..6149790
--- /dev/null
+++ b/validator/aria_validator.py
@@ -0,0 +1,43 @@
+# Copyright (c) 2017 Intel Corp. All rights reserved.
+#
+# Licensed 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.
+#
+
+import os
+
+from aria.parser.loading import LiteralLocation
+from aria.parser.consumption import (
+    ConsumptionContext,
+    ConsumerChain,
+    Read,
+    Validate,
+    ServiceTemplate,
+    ServiceInstance
+)
+
+import validator
+
+
+class AriaValidator(validator.ValidatorBase):
+    def validate(self, reader):
+        context = ConsumptionContext()
+        context.loading.prefixes += [os.path.join(reader.destination, 'definitions')]
+        context.presentation.location = LiteralLocation(reader.entry_definitions_yaml)
+        print reader.entry_definitions_yaml
+        chain = ConsumerChain(context, (Read, Validate, ServiceTemplate, ServiceInstance))
+        chain.consume()
+        if context.validation.dump_issues():
+            raise RuntimeError('Validation failed')
+        dumper = chain.consumers[-1]
+        dumper.dump()
+