338 lines
13 KiB
Python
338 lines
13 KiB
Python
# Copyright 2017 The Armada Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import difflib
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import yaml
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from oslo_config import cfg
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from oslo_log import log as logging
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from supermutes.dot import dotify
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from chartbuilder import ChartBuilder
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from tiller import Tiller
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from manifest import Manifest
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from ..exceptions import armada_exceptions
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from ..exceptions import source_exceptions
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from ..exceptions import lint_exceptions
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from ..exceptions import tiller_exceptions
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from ..utils.release import release_prefix
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from ..utils import source
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from ..utils import lint
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from ..const import KEYWORD_ARMADA, KEYWORD_GROUPS, KEYWORD_CHARTS,\
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KEYWORD_PREFIX, STATUS_FAILED
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LOG = logging.getLogger(__name__)
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DEFAULT_TIMEOUT = 3600
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CONF = cfg.CONF
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class Armada(object):
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'''
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This is the main Armada class handling the Armada
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workflows
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'''
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def __init__(self,
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file,
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disable_update_pre=False,
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disable_update_post=False,
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enable_chart_cleanup=False,
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dry_run=False,
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wait=False,
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timeout=DEFAULT_TIMEOUT,
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tiller_host=None,
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tiller_port=44134,
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debug=False):
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'''
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Initialize the Armada Engine and establish
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a connection to Tiller
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'''
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self.disable_update_pre = disable_update_pre
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self.disable_update_post = disable_update_post
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self.enable_chart_cleanup = enable_chart_cleanup
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self.dry_run = dry_run
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self.wait = wait
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self.timeout = timeout
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self.tiller = Tiller(tiller_host=tiller_host, tiller_port=tiller_port)
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self.documents = list(yaml.safe_load_all(file))
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self.config = None
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self.debug = debug
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# Set debug value
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# Define a default handler at INFO logging level
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if self.debug:
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logging.basicConfig(level=logging.DEBUG)
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def get_armada_manifest(self):
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return Manifest(self.documents).get_manifest()
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def find_release_chart(self, known_releases, name):
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'''
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Find a release given a list of known_releases and a release name
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'''
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for chart_name, _, chart, values, _ in known_releases:
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if chart_name == name:
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return chart, values
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def pre_flight_ops(self):
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'''
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Perform a series of checks and operations to ensure proper deployment
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'''
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# Ensure tiller is available and yaml is valid
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if not self.tiller.tiller_status():
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raise tiller_exceptions.TillerServicesUnavailableException()
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if not lint.validate_armada_documents(self.documents):
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raise lint_exceptions.InvalidManifestException()
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self.config = self.get_armada_manifest()
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if not lint.validate_armada_object(self.config):
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raise lint_exceptions.InvalidArmadaObjectExceptionl()
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self.config = self.get_armada_manifest()
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# Purge known releases that have failed and are in the current yaml
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prefix = self.config.get(KEYWORD_ARMADA).get(KEYWORD_PREFIX)
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failed_releases = self.get_releases_by_status(STATUS_FAILED)
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for release in failed_releases:
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for group in self.config.get(KEYWORD_ARMADA).get(KEYWORD_GROUPS):
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for ch in group.get(KEYWORD_CHARTS):
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ch_release_name = release_prefix(prefix,
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ch.get('chart')
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.get('chart_name'))
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if release[0] == ch_release_name:
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LOG.info('Purging failed release %s '
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'before deployment', release[0])
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self.tiller.uninstall_release(release[0])
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# Clone the chart sources
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#
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# We only support a git source type right now, which can also
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# handle git:// local paths as well
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repos = {}
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for group in self.config.get(KEYWORD_ARMADA).get(KEYWORD_GROUPS):
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for ch in group.get(KEYWORD_CHARTS):
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self.tag_cloned_repo(ch, repos)
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for dep in ch.get('chart').get('dependencies'):
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self.tag_cloned_repo(dep, repos)
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def tag_cloned_repo(self, ch, repos):
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location = ch.get('chart').get('source').get('location')
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ct_type = ch.get('chart').get('source').get('type')
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reference = ch.get('chart').get('source').get('reference')
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subpath = ch.get('chart').get('source').get('subpath')
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if ct_type == 'local':
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ch.get('chart')['source_dir'] = (location, subpath)
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elif ct_type == 'tar':
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LOG.info('Downloading tarball from: %s', location)
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tarball_dir = source.get_tarball(location)
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ch.get('chart')['source_dir'] = (tarball_dir, subpath)
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elif ct_type == 'git':
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if location not in repos.keys():
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try:
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LOG.info('Cloning repo: %s', location)
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repo_dir = source.git_clone(location, reference)
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except Exception:
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raise source_exceptions.GitLocationException(location)
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repos[location] = repo_dir
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ch.get('chart')['source_dir'] = (repo_dir, subpath)
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else:
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ch.get('chart')['source_dir'] = (repos.get(location), subpath)
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else:
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chart_name = ch.get('chart').get('chart_name')
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raise source_exceptions.ChartSourceException(ct_type, chart_name)
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def get_releases_by_status(self, status):
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'''
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:params status - status string to filter releases on
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Return a list of current releases with a specified status
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'''
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filtered_releases = []
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known_releases = self.tiller.list_charts()
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for release in known_releases:
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if release[4] == status:
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filtered_releases.append(release)
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return filtered_releases
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def sync(self):
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'''
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Syncronize Helm with the Armada Config(s)
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'''
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# TODO: (gardlt) we need to break up this func into
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# a more cleaner format
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LOG.info("Performing Pre-Flight Operations")
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self.pre_flight_ops()
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# extract known charts on tiller right now
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known_releases = self.tiller.list_charts()
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prefix = self.config.get(KEYWORD_ARMADA).get(KEYWORD_PREFIX)
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if known_releases is None:
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raise armada_exceptions.KnownReleasesException()
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for release in known_releases:
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LOG.debug("Release %s, Version %s found on tiller", release[0],
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release[1])
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for entry in self.config[KEYWORD_ARMADA][KEYWORD_GROUPS]:
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chart_wait = self.wait
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desc = entry.get('description', 'A Chart Group')
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chart_group = entry.get(KEYWORD_CHARTS, [])
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if entry.get('sequenced', False):
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chart_wait = True
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LOG.info('Deploying: %s', desc)
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for gchart in chart_group:
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chart = dotify(gchart['chart'])
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values = gchart.get('chart').get('values', {})
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pre_actions = {}
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post_actions = {}
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LOG.info('%s', chart.release)
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if chart.release is None:
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continue
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# retrieve appropriate timeout value if 'wait' is specified
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chart_timeout = self.timeout
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if chart_wait:
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if chart_timeout == DEFAULT_TIMEOUT:
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chart_timeout = getattr(chart, 'timeout',
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chart_timeout)
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chartbuilder = ChartBuilder(chart)
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protoc_chart = chartbuilder.get_helm_chart()
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# determine install or upgrade by examining known releases
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LOG.debug("RELEASE: %s", chart.release)
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deployed_releases = [x[0] for x in known_releases]
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prefix_chart = release_prefix(prefix, chart.release)
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if prefix_chart in deployed_releases:
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# indicate to the end user what path we are taking
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LOG.info("Upgrading release %s", chart.release)
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# extract the installed chart and installed values from the
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# latest release so we can compare to the intended state
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LOG.info("Checking Pre/Post Actions")
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apply_chart, apply_values = self.find_release_chart(
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known_releases, prefix_chart)
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LOG.info("Checking Pre/Post Actions")
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upgrade = gchart.get('chart', {}).get('upgrade', False)
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if upgrade:
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if not self.disable_update_pre and upgrade.get(
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'pre', False):
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pre_actions = getattr(chart.upgrade, 'pre', {})
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if not self.disable_update_post and upgrade.get(
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'post', False):
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post_actions = getattr(chart.upgrade, 'post', {})
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# show delta for both the chart templates and the chart
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# values
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# TODO(alanmeadows) account for .files differences
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# once we support those
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upgrade_diff = self.show_diff(chart, apply_chart,
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apply_values,
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chartbuilder.dump(), values)
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if not upgrade_diff:
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LOG.info("There are no updates found in this chart")
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continue
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# do actual update
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self.tiller.update_release(protoc_chart,
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prefix_chart,
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chart.namespace,
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pre_actions=pre_actions,
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post_actions=post_actions,
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dry_run=self.dry_run,
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disable_hooks=chart.
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upgrade.no_hooks,
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values=yaml.safe_dump(values),
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wait=chart_wait,
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timeout=chart_timeout)
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# process install
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else:
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LOG.info("Installing release %s", chart.release)
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self.tiller.install_release(protoc_chart,
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prefix_chart,
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chart.namespace,
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dry_run=self.dry_run,
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values=yaml.safe_dump(values),
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wait=chart_wait,
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timeout=chart_timeout)
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LOG.debug("Cleaning up chart source in %s",
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chartbuilder.source_directory)
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LOG.info("Performing Post-Flight Operations")
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self.post_flight_ops()
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if self.enable_chart_cleanup:
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self.tiller.chart_cleanup(
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prefix, self.config[KEYWORD_ARMADA][KEYWORD_GROUPS])
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def post_flight_ops(self):
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'''
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Operations to run after deployment process has terminated
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'''
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# Delete git repos cloned for deployment
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for group in self.config.get(KEYWORD_ARMADA).get(KEYWORD_GROUPS):
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for ch in group.get(KEYWORD_CHARTS):
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if ch.get('chart').get('source').get('type') == 'git':
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source.source_cleanup(ch.get('chart').get('source_dir')[0])
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def show_diff(self, chart, installed_chart, installed_values, target_chart,
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target_values):
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'''
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Produce a unified diff of the installed chart vs our intention
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TODO(alanmeadows): This needs to be rewritten to produce better
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unified diff output and avoid the use of print
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'''
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chart_diff = list(
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difflib.unified_diff(installed_chart.SerializeToString()
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.split('\n'), target_chart.split('\n')))
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if len(chart_diff) > 0:
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LOG.info("Chart Unified Diff (%s)", chart.release)
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for line in chart_diff:
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LOG.debug(line)
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values_diff = list(
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difflib.unified_diff(
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installed_values.split('\n'),
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yaml.safe_dump(target_values).split('\n')))
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if len(values_diff) > 0:
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LOG.info("Values Unified Diff (%s)", chart.release)
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for line in values_diff:
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LOG.debug(line)
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return (len(chart_diff) > 0) or (len(values_diff) > 0)
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