50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
#!/usr/bin/env python
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# Copyright 2016 Canonical UK Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import os
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from jinja2 import Environment
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from jinja2.exceptions import TemplateNotFound
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from jinja2 import FileSystemLoader
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LOG = logging.getLogger(__name__)
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class SnapFileRenderer(object):
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'''Helper class for rendering snap templates for runtime use'''
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def __init__(self):
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self._tmpl_env = Environment(
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loader=FileSystemLoader(os.path.join(os.environ.get('SNAP'),
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'templates')),
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trim_blocks=True
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)
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def render(self, template_name, env):
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'''Render j2 template using SNAP environment context provided
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@param template_name: name of the template to use for rendering
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@param env: dict of variables to pass to the renderer
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@return: string of rendered data, ready to write back to a file
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'''
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try:
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template = self._tmpl_env.get_template(template_name)
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except TemplateNotFound as te:
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LOG.error('Unable to locate template: {}'.format(template_name))
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raise te
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return template.render(env)
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