201 lines
7.9 KiB
Python
201 lines
7.9 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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import 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 ..utils.release import release_prefix
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from ..utils import git
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from ..utils import lint
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LOG = logging.getLogger(__name__)
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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, config,
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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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skip_pre_flight=False,
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dry_run=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.skip_pre_flight = skip_pre_flight
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self.dry_run = dry_run
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self.config = yaml.load(config)
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self.tiller = Tiller()
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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_checks(self):
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for ch in self.config['armada']['charts']:
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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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if ct_type == 'git' and not git.check_available_repo(location):
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raise ValueError(str("Invalid Url Path: " + location))
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if not self.tiller.tiller_status():
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raise Exception("Tiller Services is not Available")
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if not lint.valid_manifest(self.config):
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raise Exception("Invalid Armada Manifest")
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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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# 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('armada').get('release_prefix')
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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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if not self.skip_pre_flight:
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LOG.info("Performing Checking Pre Flight Tasks")
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self.pre_flight_checks()
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else:
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LOG.info("Skipping Pre flight Checks")
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for entry in self.config['armada']['charts']:
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chart = dotify(entry['chart'])
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values = entry.get('chart').get('values', {})
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pre_actions = {}
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post_actions = {}
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if chart.release_name is None:
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continue
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# initialize helm chart and request a
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# protoc helm chart object which will
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# pull the sources down and walk the
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# dependencies
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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_name)
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if release_prefix(prefix, chart.release_name) in [x[0]
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for x in
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known_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_name)
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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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installed_chart, installed_values = self.find_release_chart(
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known_releases, release_prefix(prefix, chart.release_name))
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if not self.disable_update_pre and getattr(chart, 'upgrade',
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False):
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pre_actions = getattr(chart.upgrade, 'pre', {})
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if not self.disable_update_post and getattr(chart, 'upgrade',
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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 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, installed_chart,
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installed_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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self.dry_run,
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chart.release_name,
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chart.namespace,
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prefix, pre_actions,
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post_actions,
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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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# process install
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else:
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LOG.info("Installing release %s", chart.release_name)
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self.tiller.install_release(protoc_chart,
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self.dry_run,
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chart.release_name,
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chart.namespace,
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prefix,
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values=yaml.safe_dump(values))
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LOG.debug("Cleaning up chart source in %s",
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chartbuilder.source_directory)
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chartbuilder.source_cleanup()
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if self.enable_chart_cleanup:
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self.tiller.chart_cleanup(prefix, self.config['armada']['charts'])
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def show_diff(self, chart, installed_chart,
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installed_values, target_chart, 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(difflib.unified_diff(installed_chart
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.SerializeToString()
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.split('\n'),
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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_name)
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for line in chart_diff:
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LOG.debug(line)
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values_diff = list(difflib.unified_diff(installed_values.split('\n'),
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yaml
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.safe_dump(target_values)
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.split('\n')))
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if len(values_diff) > 0:
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LOG.info("Values Unified Diff (%s)", chart.release_name)
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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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