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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.
"""
Common code for contexts.
"""
import logging
from contextlib import contextmanager
from functools import partial
import jinja2
from aria import (
logger as aria_logger,
modeling
)
from aria.storage import exceptions
from ...utils.uuid import generate_uuid
class BaseContext(object):
"""
Base class for contexts.
"""
INSTRUMENTATION_FIELDS = (
modeling.models.Service.inputs,
modeling.models.ServiceTemplate.inputs,
modeling.models.Policy.properties,
modeling.models.PolicyTemplate.properties,
modeling.models.Node.attributes,
modeling.models.Node.properties,
modeling.models.NodeTemplate.attributes,
modeling.models.NodeTemplate.properties,
modeling.models.Group.properties,
modeling.models.GroupTemplate.properties,
modeling.models.Capability.properties,
# TODO ARIA-279: modeling.models.Capability.attributes,
modeling.models.CapabilityTemplate.properties,
# TODO ARIA-279: modeling.models.CapabilityTemplate.attributes
modeling.models.Relationship.properties,
modeling.models.Artifact.properties,
modeling.models.ArtifactTemplate.properties,
modeling.models.Interface.inputs,
modeling.models.InterfaceTemplate.inputs,
modeling.models.Operation.inputs,
modeling.models.OperationTemplate.inputs
)
class PrefixedLogger(object):
def __init__(self, base_logger, task_id=None):
self._logger = base_logger
self._task_id = task_id
def __getattr__(self, attribute):
if attribute.upper() in logging._levelNames:
return partial(self._logger_with_task_id, _level=attribute)
else:
return getattr(self._logger, attribute)
def _logger_with_task_id(self, *args, **kwargs):
level = kwargs.pop('_level')
kwargs.setdefault('extra', {})['task_id'] = self._task_id
return getattr(self._logger, level)(*args, **kwargs)
def __init__(self,
name,
service_id,
model_storage,
resource_storage,
execution_id,
workdir=None,
**kwargs):
super(BaseContext, self).__init__(**kwargs)
self._name = name
self._id = generate_uuid(variant='uuid')
self._model = model_storage
self._resource = resource_storage
self._service_id = service_id
self._workdir = workdir
self._execution_id = execution_id
self.logger = None
def _register_logger(self, level=None, task_id=None):
self.logger = self.PrefixedLogger(
logging.getLogger(aria_logger.TASK_LOGGER_NAME), task_id=task_id)
self.logger.setLevel(level or logging.DEBUG)
if not self.logger.handlers:
self.logger.addHandler(self._get_sqla_handler())
def _get_sqla_handler(self):
return aria_logger.create_sqla_log_handler(model=self._model,
log_cls=modeling.models.Log,
execution_id=self._execution_id)
def __repr__(self):
return (
'{name}(name={self.name}, '
'deployment_id={self._service_id}, '
.format(name=self.__class__.__name__, self=self))
@contextmanager
def logging_handlers(self, handlers=None):
handlers = handlers or []
try:
for handler in handlers:
self.logger.addHandler(handler)
yield self.logger
finally:
for handler in handlers:
self.logger.removeHandler(handler)
@property
def model(self):
"""
Storage model API ("MAPI").
"""
return self._model
@property
def resource(self):
"""
Storage resource API ("RAPI").
"""
return self._resource
@property
def service_template(self):
"""
Service template model.
"""
return self.service.service_template
@property
def service(self):
"""
Service instance model.
"""
return self.model.service.get(self._service_id)
@property
def name(self):
"""
Operation name.
"""
return self._name
@property
def id(self):
"""
Operation ID.
"""
return self._id
def download_resource(self, destination, path=None):
"""
Download a service template resource from the storage resource API ("RAPI").
"""
try:
self.resource.service.download(entry_id=str(self.service.id),
destination=destination,
path=path)
except exceptions.StorageError:
self.resource.service_template.download(entry_id=str(self.service_template.id),
destination=destination,
path=path)
def download_resource_and_render(self, destination, path=None, variables=None):
"""
Downloads a service template resource from the resource storage and renders its content as a
Jinja template using the provided variables. ``ctx`` is available to the template without
providing it explicitly.
"""
resource_content = self.get_resource(path=path)
resource_content = self._render_resource(resource_content=resource_content,
variables=variables)
with open(destination, 'wb') as f:
f.write(resource_content)
def get_resource(self, path=None):
"""
Reads a service instance resource as string from the resource storage.
"""
try:
return self.resource.service.read(entry_id=str(self.service.id), path=path)
except exceptions.StorageError:
return self.resource.service_template.read(entry_id=str(self.service_template.id),
path=path)
def get_resource_and_render(self, path=None, variables=None):
"""
Reads a service instance resource as string from the resource storage and renders it as a
Jinja template using the provided variables. ``ctx`` is available to the template without
providing it explicitly.
"""
resource_content = self.get_resource(path=path)
return self._render_resource(resource_content=resource_content, variables=variables)
def _render_resource(self, resource_content, variables):
variables = variables or {}
variables.setdefault('ctx', self)
resource_template = jinja2.Template(resource_content)
return resource_template.render(variables)
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