612 lines
26 KiB
Python
612 lines
26 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 time
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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 armada import const
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from armada.exceptions import armada_exceptions
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from armada.exceptions import source_exceptions
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from armada.exceptions import tiller_exceptions
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from armada.exceptions import validate_exceptions
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from armada.handlers.chartbuilder import ChartBuilder
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from armada.handlers.manifest import Manifest
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from armada.handlers.override import Override
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from armada.handlers.test import test_release_for_success
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from armada.handlers.tiller import Tiller
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from armada.utils.release import release_prefixer
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from armada.utils import source
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from armada.utils import validate
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LOG = logging.getLogger(__name__)
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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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documents,
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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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set_ovr=None,
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force_wait=False,
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timeout=0,
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tiller_host=None,
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tiller_port=None,
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tiller_namespace=None,
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values=None,
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target_manifest=None,
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k8s_wait_attempts=1,
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k8s_wait_attempt_sleep=1):
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'''
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Initialize the Armada engine and establish a connection to Tiller.
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:param List[dict] documents: Armada documents.
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:param bool disable_update_pre: Disable pre-update Tiller operations.
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:param bool disable_update_post: Disable post-update Tiller
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operations.
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:param bool enable_chart_cleanup: Clean up unmanaged charts.
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:param bool dry_run: Run charts without installing them.
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:param bool force_wait: Force Tiller to wait until all charts are
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deployed, rather than using each chart's specified wait policy.
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:param int timeout: Specifies overall time in seconds that Tiller
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should wait for charts until timing out.
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:param str tiller_host: Tiller host IP. Default is None.
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:param int tiller_port: Tiller host port. Default is
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``CONF.tiller_port``.
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:param str tiller_namespace: Tiller host namespace. Default is
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``CONF.tiller_namespace``.
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:param str target_manifest: The target manifest to run. Useful for
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specifying which manifest to run when multiple are available.
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:param int k8s_wait_attempts: The number of times to attempt waiting
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for pods to become ready.
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:param int k8s_wait_attempt_sleep: The time in seconds to sleep
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between attempts.
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'''
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tiller_port = tiller_port or CONF.tiller_port
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tiller_namespace = tiller_namespace or CONF.tiller_namespace
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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.force_wait = force_wait
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self.timeout = timeout
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# TODO: Use dependency injection i.e. pass in a Tiller instead of
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# creating it here.
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self.tiller = Tiller(
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tiller_host=tiller_host,
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tiller_port=tiller_port,
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tiller_namespace=tiller_namespace,
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dry_run=dry_run)
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self.documents = Override(
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documents, overrides=set_ovr, values=values).update_manifests()
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self.k8s_wait_attempts = k8s_wait_attempts
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self.k8s_wait_attempt_sleep = k8s_wait_attempt_sleep
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self.manifest = Manifest(
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self.documents, target_manifest=target_manifest).get_manifest()
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def find_release_chart(self, known_releases, release_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 release, _, chart, values, _ in known_releases:
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if release == release_name:
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return chart, values
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def pre_flight_ops(self):
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"""Perform a series of checks and operations to ensure proper
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deployment.
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"""
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LOG.info("Performing pre-flight operations.")
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# Ensure Tiller is available and manifest is valid
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if not self.tiller.tiller_status():
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raise tiller_exceptions.TillerServicesUnavailableException()
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valid, details = validate.validate_armada_documents(self.documents)
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if details:
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for msg in details:
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if msg.get('error', False):
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LOG.error(msg.get('message', 'Unknown validation error.'))
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else:
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LOG.debug(msg.get('message', 'Validation succeeded.'))
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if not valid:
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raise validate_exceptions.InvalidManifestException(
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error_messages=details)
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# TODO(MarshM): this is duplicated inside validate_armada_documents()
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# L126, and should be unreachable code if it has errors
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result, msg_list = validate.validate_armada_manifests(self.documents)
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if not result:
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raise validate_exceptions.InvalidArmadaObjectException(
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details=','.join([m.get('message') for m in msg_list]))
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# Clone the chart sources
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repos = {}
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manifest_data = self.manifest.get(const.KEYWORD_ARMADA, {})
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for group in manifest_data.get(const.KEYWORD_GROUPS, []):
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for ch in group.get(const.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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chart = ch.get('chart', {})
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chart_source = chart.get('source', {})
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location = chart_source.get('location')
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ct_type = chart_source.get('type')
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subpath = chart_source.get('subpath', '.')
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if ct_type == 'local':
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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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if not CONF.certs:
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LOG.warn('Disabling server validation certs to extract charts')
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tarball_dir = source.get_tarball(location, verify=False)
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else:
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tarball_dir = source.get_tarball(location, verify=CONF.cert)
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chart['source_dir'] = (tarball_dir, subpath)
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elif ct_type == 'git':
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reference = chart_source.get('reference', 'master')
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repo_branch = (location, reference)
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if repo_branch not in repos:
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auth_method = chart_source.get('auth_method')
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proxy_server = chart_source.get('proxy_server')
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logstr = 'Cloning repo: {} from branch: {}'.format(
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*repo_branch)
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if proxy_server:
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logstr += ' proxy: {}'.format(proxy_server)
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if auth_method:
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logstr += ' auth method: {}'.format(auth_method)
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LOG.info(logstr)
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repo_dir = source.git_clone(
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*repo_branch,
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proxy_server=proxy_server,
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auth_method=auth_method)
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repos[repo_branch] = repo_dir
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chart['source_dir'] = (repo_dir, subpath)
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else:
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chart['source_dir'] = (repos.get(repo_branch), subpath)
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else:
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chart_name = 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):
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'''
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Return a list of current releases with DEPLOYED or FAILED status
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'''
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deployed_releases = []
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failed_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] == const.STATUS_DEPLOYED:
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deployed_releases.append(release)
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elif release[4] == const.STATUS_FAILED:
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failed_releases.append(release)
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else:
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# tiller.list_charts() only looks at DEPLOYED/FAILED so
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# this should be unreachable
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LOG.debug('Ignoring release %s in status %s.', release[0],
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release[4])
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return deployed_releases, failed_releases
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def sync(self):
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'''
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Synchronize Helm with the Armada Config(s)
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'''
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if self.dry_run:
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LOG.info('Armada is in DRY RUN mode, no changes being made.')
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msg = {
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'install': [],
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'upgrade': [],
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'diff': [],
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'purge': [],
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'protected': []
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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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self.pre_flight_ops()
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# extract known charts on tiller right now
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deployed_releases, failed_releases = self._get_releases_by_status()
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manifest_data = self.manifest.get(const.KEYWORD_ARMADA, {})
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prefix = manifest_data.get(const.KEYWORD_PREFIX)
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for chartgroup in manifest_data.get(const.KEYWORD_GROUPS, []):
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cg_name = chartgroup.get('name', '<missing name>')
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cg_desc = chartgroup.get('description', '<missing description>')
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cg_sequenced = chartgroup.get('sequenced', False)
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cg_test_all_charts = chartgroup.get('test_charts', False)
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LOG.info(
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'Processing ChartGroup: %s (%s), sequenced=%s, '
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'test_charts=%s', cg_name, cg_desc, cg_sequenced,
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cg_test_all_charts)
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ns_label_set = set()
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tests_to_run = []
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cg_charts = chartgroup.get(const.KEYWORD_CHARTS, [])
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# Track largest Chart timeout to stop the ChartGroup at the end
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cg_max_timeout = 0
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for chart_entry in cg_charts:
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chart = chart_entry.get('chart', {})
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namespace = chart.get('namespace')
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release = chart.get('release')
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release_name = release_prefixer(prefix, release)
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values = chart.get('values', {})
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pre_actions = {}
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post_actions = {}
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protected = chart.get('protected', {})
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p_continue = protected.get('continue_processing', False)
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# Check for existing FAILED release, and purge
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if release_name in [rel[0] for rel in failed_releases]:
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LOG.info('Purging FAILED release %s before deployment.',
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release_name)
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if protected:
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if p_continue:
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LOG.warn(
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'Release %s is `protected`, '
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'continue_processing=True. Operator must '
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'handle FAILED release manually.',
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release_name)
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msg['protected'].append(release_name)
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continue
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else:
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LOG.error(
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'Release %s is `protected`, '
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'continue_processing=False.', release_name)
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raise armada_exceptions.ProtectedReleaseException(
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release_name)
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else:
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# Purge the release
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self.tiller.uninstall_release(release_name)
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msg['purge'].append(release_name)
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wait_timeout = self.timeout
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wait_labels = {}
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# Retrieve appropriate timeout value
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if wait_timeout <= 0:
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# TODO(MarshM): chart's `data.timeout` should be deprecated
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chart_timeout = chart.get('timeout', 0)
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# Favor data.wait.timeout over data.timeout, until removed
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wait_values = chart.get('wait', {})
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wait_timeout = wait_values.get('timeout', chart_timeout)
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wait_labels = wait_values.get('labels', {})
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# Determine wait logic
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this_chart_should_wait = (cg_sequenced or self.force_wait or
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wait_timeout > 0 or
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len(wait_labels) > 0)
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if this_chart_should_wait and wait_timeout <= 0:
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LOG.warn('No Chart timeout specified, using default: %ss',
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const.DEFAULT_CHART_TIMEOUT)
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wait_timeout = const.DEFAULT_CHART_TIMEOUT
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# Naively take largest timeout to apply at end
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# TODO(MarshM) better handling of timeout/timer
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cg_max_timeout = max(wait_timeout, cg_max_timeout)
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# Chart test policy can override ChartGroup, if specified
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test_this_chart = chart.get('test', cg_test_all_charts)
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chartbuilder = ChartBuilder(chart)
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protoc_chart = chartbuilder.get_helm_chart()
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# Begin Chart timeout deadline
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deadline = time.time() + wait_timeout
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# TODO(mark-burnett): It may be more robust to directly call
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# tiller status to decide whether to install/upgrade rather
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# than checking for list membership.
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if release_name in [rel[0] for rel 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 in namespace %s",
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release_name, namespace)
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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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apply_chart, apply_values = self.find_release_chart(
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deployed_releases, release_name)
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upgrade = chart.get('upgrade', {})
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disable_hooks = upgrade.get('no_hooks', False)
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force = upgrade.get('force', False)
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recreate_pods = upgrade.get('recreate_pods', False)
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LOG.info("Checking Pre/Post Actions")
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if upgrade:
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upgrade_pre = upgrade.get('pre', {})
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upgrade_post = upgrade.get('post', {})
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if not self.disable_update_pre and upgrade_pre:
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pre_actions = upgrade_pre
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if not self.disable_update_post and upgrade_post:
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post_actions = 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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LOG.info('Checking upgrade chart diffs.')
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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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msg)
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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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# TODO(MarshM): Add tiller dry-run before upgrade and
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# consider deadline impacts
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# do actual update
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timer = int(round(deadline - time.time()))
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LOG.info('Beginning Upgrade, wait=%s, timeout=%ss',
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this_chart_should_wait, timer)
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tiller_result = self.tiller.update_release(
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protoc_chart,
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release_name,
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namespace,
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pre_actions=pre_actions,
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post_actions=post_actions,
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disable_hooks=disable_hooks,
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values=yaml.safe_dump(values),
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wait=this_chart_should_wait,
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timeout=timer,
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force=force,
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recreate_pods=recreate_pods)
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if this_chart_should_wait:
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self._wait_until_ready(release_name, wait_labels,
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namespace, timer)
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# Track namespace+labels touched by upgrade
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ns_label_set.add((namespace, tuple(wait_labels.items())))
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LOG.info('Upgrade completed with results from Tiller: %s',
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tiller_result.__dict__)
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msg['upgrade'].append(release_name)
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# process install
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else:
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LOG.info("Installing release %s in namespace %s",
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release_name, namespace)
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timer = int(round(deadline - time.time()))
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LOG.info('Beginning Install, wait=%s, timeout=%ss',
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this_chart_should_wait, timer)
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tiller_result = self.tiller.install_release(
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protoc_chart,
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release_name,
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namespace,
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values=yaml.safe_dump(values),
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wait=this_chart_should_wait,
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timeout=timer)
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if this_chart_should_wait:
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self._wait_until_ready(release_name, wait_labels,
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namespace, timer)
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# Track namespace+labels touched by install
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ns_label_set.add((namespace, tuple(wait_labels.items())))
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LOG.info('Install completed with results from Tiller: %s',
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tiller_result.__dict__)
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msg['install'].append(release_name)
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# Sequenced ChartGroup should run tests after each Chart
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timer = int(round(deadline - time.time()))
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if test_this_chart:
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if cg_sequenced:
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LOG.info(
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'Running sequenced test, timeout remaining: '
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'%ss.', timer)
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if timer <= 0:
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reason = ('Timeout expired before testing '
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'sequenced release %s' % release_name)
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LOG.error(reason)
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raise armada_exceptions.ArmadaTimeoutException(
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reason)
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self._test_chart(release_name, timer)
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# Un-sequenced ChartGroup should run tests at the end
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else:
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# Keeping track of time remaining
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tests_to_run.append((release_name, timer))
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# End of Charts in ChartGroup
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LOG.info('All Charts applied in ChartGroup %s.', cg_name)
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# After all Charts are applied, we should wait for the entire
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# ChartGroup to become healthy by looking at the namespaces seen
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# TODO(MarshM): Need to determine a better timeout
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# (not cg_max_timeout)
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if cg_max_timeout <= 0:
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cg_max_timeout = const.DEFAULT_CHART_TIMEOUT
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deadline = time.time() + cg_max_timeout
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for (ns, labels) in ns_label_set:
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labels_dict = dict(labels)
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timer = int(round(deadline - time.time()))
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LOG.info(
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'Final ChartGroup wait for healthy namespace (%s), '
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'labels=(%s), timeout remaining: %ss.', ns, labels_dict,
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timer)
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if timer <= 0:
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reason = ('Timeout expired waiting on namespace: %s, '
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'labels: (%s)' % (ns, labels_dict))
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LOG.error(reason)
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raise armada_exceptions.ArmadaTimeoutException(reason)
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self._wait_until_ready(
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release_name=None,
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wait_labels=labels_dict,
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namespace=ns,
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timeout=timer)
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# After entire ChartGroup is healthy, run any pending tests
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for (test, test_timer) in tests_to_run:
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self._test_chart(test, test_timer)
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self.post_flight_ops()
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if self.enable_chart_cleanup:
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self._chart_cleanup(
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prefix,
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self.manifest[const.KEYWORD_ARMADA][const.KEYWORD_GROUPS], msg)
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LOG.info('Done applying manifest.')
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return msg
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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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LOG.info("Performing post-flight operations.")
|
|
|
|
# Delete temp dirs used for deployment
|
|
for group in self.manifest.get(const.KEYWORD_ARMADA, {}).get(
|
|
const.KEYWORD_GROUPS, []):
|
|
for ch in group.get(const.KEYWORD_CHARTS, []):
|
|
chart = ch.get('chart', {})
|
|
if chart.get('source', {}).get('type') == 'git':
|
|
source_dir = chart.get('source_dir')
|
|
if isinstance(source_dir, tuple) and source_dir:
|
|
source.source_cleanup(source_dir[0])
|
|
|
|
def _wait_until_ready(self, release_name, wait_labels, namespace, timeout):
|
|
if self.dry_run:
|
|
LOG.info(
|
|
'Skipping wait during `dry-run`, would have waited on '
|
|
'namespace=%s, labels=(%s) for %ss.', namespace, wait_labels,
|
|
timeout)
|
|
return
|
|
|
|
self.tiller.k8s.wait_until_ready(
|
|
release=release_name,
|
|
labels=wait_labels,
|
|
namespace=namespace,
|
|
k8s_wait_attempts=self.k8s_wait_attempts,
|
|
k8s_wait_attempt_sleep=self.k8s_wait_attempt_sleep,
|
|
timeout=timeout)
|
|
|
|
def _test_chart(self, release_name, timeout):
|
|
if self.dry_run:
|
|
LOG.info(
|
|
'Skipping test during `dry-run`, would have tested '
|
|
'release=%s with timeout %ss.', release_name, timeout)
|
|
return True
|
|
|
|
success = test_release_for_success(
|
|
self.tiller, release_name, timeout=timeout)
|
|
if success:
|
|
LOG.info("Test passed for release: %s", release_name)
|
|
else:
|
|
LOG.info("Test failed for release: %s", release_name)
|
|
raise tiller_exceptions.TestFailedException(release_name)
|
|
|
|
def show_diff(self, chart, installed_chart, installed_values, target_chart,
|
|
target_values, msg):
|
|
'''Produce a unified diff of the installed chart vs our intention'''
|
|
|
|
# TODO(MarshM) This gives decent output comparing values. Would be
|
|
# nice to clean it up further. Are \\n or \n\n ever valid diffs?
|
|
# Can these be cleanly converted to dicts, for easier compare?
|
|
def _sanitize_diff_str(str):
|
|
return str.replace('\\n', '\n').replace('\n\n', '\n').split('\n')
|
|
|
|
source = _sanitize_diff_str(str(installed_chart.SerializeToString()))
|
|
target = _sanitize_diff_str(str(target_chart))
|
|
chart_diff = list(difflib.unified_diff(source, target, n=0))
|
|
|
|
chart_release = chart.get('release', None)
|
|
|
|
if len(chart_diff) > 0:
|
|
LOG.info("Found diff in Chart (%s)", chart_release)
|
|
diff_msg = []
|
|
for line in chart_diff:
|
|
diff_msg.append(line)
|
|
msg['diff'].append({'chart': diff_msg})
|
|
|
|
pretty_diff = '\n'.join(diff_msg)
|
|
LOG.debug(pretty_diff)
|
|
|
|
source = _sanitize_diff_str(installed_values)
|
|
target = _sanitize_diff_str(yaml.safe_dump(target_values))
|
|
values_diff = list(difflib.unified_diff(source, target, n=0))
|
|
|
|
if len(values_diff) > 0:
|
|
LOG.info("Found diff in values (%s)", chart_release)
|
|
diff_msg = []
|
|
for line in values_diff:
|
|
diff_msg.append(line)
|
|
msg['diff'].append({'values': diff_msg})
|
|
|
|
pretty_diff = '\n'.join(diff_msg)
|
|
LOG.debug(pretty_diff)
|
|
|
|
result = (len(chart_diff) > 0) or (len(values_diff) > 0)
|
|
|
|
return result
|
|
|
|
def _chart_cleanup(self, prefix, charts, msg):
|
|
LOG.info('Processing chart cleanup to remove unspecified releases.')
|
|
|
|
valid_releases = []
|
|
for gchart in charts:
|
|
for chart in gchart.get(const.KEYWORD_CHARTS, []):
|
|
valid_releases.append(
|
|
release_prefixer(prefix,
|
|
chart.get('chart', {}).get('release')))
|
|
|
|
actual_releases = [x.name for x in self.tiller.list_releases()]
|
|
release_diff = list(set(actual_releases) - set(valid_releases))
|
|
|
|
for release in release_diff:
|
|
if release.startswith(prefix):
|
|
LOG.info('Purging release %s as part of chart cleanup.',
|
|
release)
|
|
self.tiller.uninstall_release(release)
|
|
msg['purge'].append(release)
|