OpenStack Study: loaders.py

**** CubicPower OpenStack Study ****

# 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.

"""

Wrapper for loading templates from "templates" directories in panel modules.

"""

import os

from django.conf import settings

from django.template.base import TemplateDoesNotExist # noqa

from django.template.loader import BaseLoader # noqa

from django.utils._os import safe_join # noqa

# Set up a cache of the panel directories to search.

panel_template_dirs = {}

**** CubicPower OpenStack Study ****

class TemplateLoader(BaseLoader):

is_usable = True

**** CubicPower OpenStack Study ****

    def get_template_sources(self, template_name):

        bits = template_name.split(os.path.sep, 2)

        if len(bits) == 3:

            dash_name, panel_name, remainder = bits

            key = os.path.join(dash_name, panel_name)

            if key in panel_template_dirs:

                template_dir = panel_template_dirs[key]

                try:

                    yield safe_join(template_dir, panel_name, remainder)

                except UnicodeDecodeError:

                    # The template dir name wasn't valid UTF-8.

                    raise

                except ValueError:

                    # The joined path was located outside of template_dir.

                    pass

**** CubicPower OpenStack Study ****

    def load_template_source(self, template_name, template_dirs=None):

        for path in self.get_template_sources(template_name):

            try:

                with open(path) as file:

                    return (file.read().decode(settings.FILE_CHARSET), path)

            except IOError:

                pass

        raise TemplateDoesNotExist(template_name)

_loader = TemplateLoader()