# Copyright 2017 The Armada Authors. # # 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 difflib import yaml import logging from supermutes.dot import dotify from chartbuilder import ChartBuilder from tiller import Tiller from ..utils.release import release_prefix from ..utils import git from ..utils import lint LOG = logging.getLogger(__name__) class Armada(object): ''' This is the main Armada class handling the Armada workflows ''' def __init__(self, config, disable_update_pre=False, disable_update_post=False, enable_chart_cleanup=False, skip_pre_flight=False, dry_run=False): ''' Initialize the Armada Engine and establish a connection to Tiller ''' self.disable_update_pre = disable_update_pre self.disable_update_post = disable_update_post self.enable_chart_cleanup = enable_chart_cleanup self.skip_pre_flight = skip_pre_flight self.dry_run = dry_run self.config = yaml.load(config) self.tiller = Tiller() def find_release_chart(self, known_releases, name): ''' Find a release given a list of known_releases and a release name ''' for chart_name, _, chart, values in known_releases: if chart_name == name: return chart, values def pre_flight_checks(self): for ch in self.config['armada']['charts']: location = ch.get('chart').get('source').get('location') ct_type = ch.get('chart').get('source').get('type') if ct_type == 'git' and not git.check_available_repo(location): raise ValueError(str("Invalid Url Path: " + location)) if not self.tiller.tiller_status(): raise Exception("Tiller Services is not Available") if not lint.valid_manifest(self.config): raise Exception("Invalid Armada Manifest") def sync(self): ''' Syncronize Helm with the Armada Config(s) ''' # extract known charts on tiller right now known_releases = self.tiller.list_charts() prefix = self.config.get('armada').get('release_prefix') for release in known_releases: LOG.debug("Release %s, Version %s found on tiller", release[0], release[1]) if not self.skip_pre_flight: LOG.info("Performing Checking Pre Flight Tasks") self.pre_flight_checks() else: LOG.info("Skipping Pre flight Checks") for entry in self.config['armada']['charts']: chart = dotify(entry['chart']) values = entry.get('chart').get('values', {}) pre_actions = {} post_actions = {} if chart.release_name is None: continue # initialize helm chart and request a # protoc helm chart object which will # pull the sources down and walk the # dependencies chartbuilder = ChartBuilder(chart) protoc_chart = chartbuilder.get_helm_chart() # determine install or upgrade by examining known releases LOG.debug("RELEASE: %s", chart.release_name) if release_prefix(prefix, chart.release_name) in [x[0] for x in known_releases]: # indicate to the end user what path we are taking LOG.info("Upgrading release %s", chart.release_name) # extract the installed chart and installed values from the # latest release so we can compare to the intended state installed_chart, installed_values = self.find_release_chart( known_releases, release_prefix(prefix, chart.release_name)) if not self.disable_update_pre and getattr(chart, 'upgrade', False): pre_actions = getattr(chart.upgrade, 'pre', {}) if not self.disable_update_post and getattr(chart, 'upgrade', False): post_actions = getattr(chart.upgrade, 'post', {}) # show delta for both the chart templates and the chart values # TODO(alanmeadows) account for .files differences # once we support those upgrade_diff = self.show_diff(chart, installed_chart, installed_values, chartbuilder.dump(), values) if not upgrade_diff: LOG.info("There are no updates found in this chart") continue # do actual update self.tiller.update_release(protoc_chart, self.dry_run, chart.release_name, chart.namespace, prefix, pre_actions, post_actions, disable_hooks=chart. upgrade.no_hooks, values=yaml.safe_dump(values)) # process install else: LOG.info("Installing release %s", chart.release_name) self.tiller.install_release(protoc_chart, self.dry_run, chart.release_name, chart.namespace, prefix, values=yaml.safe_dump(values)) LOG.debug("Cleaning up chart source in %s", chartbuilder.source_directory) chartbuilder.source_cleanup() if self.enable_chart_cleanup: self.tiller.chart_cleanup(prefix, self.config['armada']['charts']) def show_diff(self, chart, installed_chart, installed_values, target_chart, target_values): ''' Produce a unified diff of the installed chart vs our intention TODO(alanmeadows): This needs to be rewritten to produce better unified diff output and avoid the use of print ''' chart_diff = list(difflib.unified_diff(installed_chart .SerializeToString() .split('\n'), target_chart.split('\n'))) if len(chart_diff) > 0: LOG.info("Chart Unified Diff (%s)", chart.release_name) for line in chart_diff: LOG.debug(line) values_diff = list(difflib.unified_diff(installed_values.split('\n'), yaml .safe_dump(target_values) .split('\n'))) if len(values_diff) > 0: LOG.info("Values Unified Diff (%s)", chart.release_name) for line in values_diff: LOG.debug(line) return (len(chart_diff) > 0) or (len(values_diff) > 0)