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imh-python
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python3.9
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openstack
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orchestration
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util
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Filename :
template_utils.py
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# Copyright 2012 OpenStack Foundation # # 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 collections import json from urllib import parse from urllib import request from openstack.orchestration.util import environment_format from openstack.orchestration.util import template_format from openstack.orchestration.util import utils from openstack import exceptions def get_template_contents(template_file=None, template_url=None, template_object=None, object_request=None, files=None, existing=False): is_object = False tpl = None # Transform a bare file path to a file:// URL. if template_file: template_url = utils.normalise_file_path_to_url(template_file) if template_url: tpl = request.urlopen(template_url).read() elif template_object: is_object = True template_url = template_object tpl = object_request and object_request('GET', template_object) elif existing: return {}, None else: raise exceptions.SDKException( 'Must provide one of template_file,' ' template_url or template_object') if not tpl: raise exceptions.SDKException( 'Could not fetch template from %s' % template_url) try: if isinstance(tpl, bytes): tpl = tpl.decode('utf-8') template = template_format.parse(tpl) except ValueError as e: raise exceptions.SDKException( 'Error parsing template %(url)s %(error)s' % {'url': template_url, 'error': e}) tmpl_base_url = utils.base_url_for_url(template_url) if files is None: files = {} resolve_template_get_files(template, files, tmpl_base_url, is_object, object_request) return files, template def resolve_template_get_files(template, files, template_base_url, is_object=False, object_request=None): def ignore_if(key, value): if key != 'get_file' and key != 'type': return True if not isinstance(value, str): return True if (key == 'type' and not value.endswith(('.yaml', '.template'))): return True return False def recurse_if(value): return isinstance(value, (dict, list)) get_file_contents(template, files, template_base_url, ignore_if, recurse_if, is_object, object_request) def is_template(file_content): try: if isinstance(file_content, bytes): file_content = file_content.decode('utf-8') template_format.parse(file_content) except (ValueError, TypeError): return False return True def get_file_contents(from_data, files, base_url=None, ignore_if=None, recurse_if=None, is_object=False, object_request=None): if recurse_if and recurse_if(from_data): if isinstance(from_data, dict): recurse_data = from_data.values() else: recurse_data = from_data for value in recurse_data: get_file_contents(value, files, base_url, ignore_if, recurse_if, is_object, object_request) if isinstance(from_data, dict): for key, value in from_data.items(): if ignore_if and ignore_if(key, value): continue if base_url and not base_url.endswith('/'): base_url = base_url + '/' str_url = parse.urljoin(base_url, value) if str_url not in files: if is_object and object_request: file_content = object_request('GET', str_url) else: file_content = utils.read_url_content(str_url) if is_template(file_content): if is_object: template = get_template_contents( template_object=str_url, files=files, object_request=object_request)[1] else: template = get_template_contents( template_url=str_url, files=files)[1] file_content = json.dumps(template) files[str_url] = file_content # replace the data value with the normalised absolute URL from_data[key] = str_url def deep_update(old, new): '''Merge nested dictionaries.''' # Prevents an error if in a previous iteration # old[k] = None but v[k] = {...}, if old is None: old = {} for k, v in new.items(): if isinstance(v, collections.Mapping): r = deep_update(old.get(k, {}), v) old[k] = r else: old[k] = new[k] return old def process_multiple_environments_and_files(env_paths=None, template=None, template_url=None, env_path_is_object=None, object_request=None, env_list_tracker=None): """Reads one or more environment files. Reads in each specified environment file and returns a dictionary of the filenames->contents (suitable for the files dict) and the consolidated environment (after having applied the correct overrides based on order). If a list is provided in the env_list_tracker parameter, the behavior is altered to take advantage of server-side environment resolution. Specifically, this means: * Populating env_list_tracker with an ordered list of environment file URLs to be passed to the server * Including the contents of each environment file in the returned files dict, keyed by one of the URLs in env_list_tracker :param env_paths: list of paths to the environment files to load; if None, empty results will be returned :type env_paths: list or None :param template: unused; only included for API compatibility :param template_url: unused; only included for API compatibility :param env_list_tracker: if specified, environment filenames will be stored within :type env_list_tracker: list or None :return: tuple of files dict and a dict of the consolidated environment :rtype: tuple """ merged_files = {} merged_env = {} # If we're keeping a list of environment files separately, include the # contents of the files in the files dict include_env_in_files = env_list_tracker is not None if env_paths: for env_path in env_paths: files, env = process_environment_and_files( env_path=env_path, template=template, template_url=template_url, env_path_is_object=env_path_is_object, object_request=object_request, include_env_in_files=include_env_in_files) # 'files' looks like {"filename1": contents, "filename2": contents} # so a simple update is enough for merging merged_files.update(files) # 'env' can be a deeply nested dictionary, so a simple update is # not enough merged_env = deep_update(merged_env, env) if env_list_tracker is not None: env_url = utils.normalise_file_path_to_url(env_path) env_list_tracker.append(env_url) return merged_files, merged_env def process_environment_and_files(env_path=None, template=None, template_url=None, env_path_is_object=None, object_request=None, include_env_in_files=False): """Loads a single environment file. Returns an entry suitable for the files dict which maps the environment filename to its contents. :param env_path: full path to the file to load :type env_path: str or None :param include_env_in_files: if specified, the raw environment file itself will be included in the returned files dict :type include_env_in_files: bool :return: tuple of files dict and the loaded environment as a dict :rtype: (dict, dict) """ files = {} env = {} is_object = env_path_is_object and env_path_is_object(env_path) if is_object: raw_env = object_request and object_request('GET', env_path) env = environment_format.parse(raw_env) env_base_url = utils.base_url_for_url(env_path) resolve_environment_urls( env.get('resource_registry'), files, env_base_url, is_object=True, object_request=object_request) elif env_path: env_url = utils.normalise_file_path_to_url(env_path) env_base_url = utils.base_url_for_url(env_url) raw_env = request.urlopen(env_url).read() env = environment_format.parse(raw_env) resolve_environment_urls( env.get('resource_registry'), files, env_base_url) if include_env_in_files: files[env_url] = json.dumps(env) return files, env def resolve_environment_urls(resource_registry, files, env_base_url, is_object=False, object_request=None): """Handles any resource URLs specified in an environment. :param resource_registry: mapping of type name to template filename :type resource_registry: dict :param files: dict to store loaded file contents into :type files: dict :param env_base_url: base URL to look in when loading files :type env_base_url: str or None """ if resource_registry is None: return rr = resource_registry base_url = rr.get('base_url', env_base_url) def ignore_if(key, value): if key == 'base_url': return True if isinstance(value, dict): return True if '::' in value: # Built in providers like: "X::Compute::Server" # don't need downloading. return True if key in ['hooks', 'restricted_actions']: return True get_file_contents(rr, files, base_url, ignore_if, is_object=is_object, object_request=object_request) for res_name, res_dict in rr.get('resources', {}).items(): res_base_url = res_dict.get('base_url', base_url) get_file_contents( res_dict, files, res_base_url, ignore_if, is_object=is_object, object_request=object_request)