591 lines
22 KiB
Python
591 lines
22 KiB
Python
import os
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import re
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import hashlib
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import oyaml as yaml
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import json
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import time
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import pprint
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from datetime import datetime, timedelta
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from dateutil.tz import tzutc
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from botocore.exceptions import ClientError
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from .utils import dict_merge, search_refs
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from .connection import BotoConnection
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from .jinja import JinjaEnv, read_config_file
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from . import __version__
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from .exceptions import ParameterNotFound, ParameterIllegalValue
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import cfnlint.core
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import logging
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logger = logging.getLogger(__name__)
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class StackStatus(object):
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"""
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StackStatus stores simplified stack statuses.
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"""
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COMPLETE = "complete"
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FAILED = "failed"
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IN_PROGRESS = "in progress"
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PENDING = "pending"
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class Stack(object):
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def __init__(self, name, template, path, rel_path, ctx):
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self.stackname = name
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self.template = template
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self.path = path
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self.rel_path = rel_path
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self.ctx = ctx
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self.tags = {}
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self.parameters = {}
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self.options = {'Legacy': False}
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self.region = 'global'
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self.profile = ''
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self.onfailure = 'DELETE'
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self.notfication_sns = []
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self.id = (self.profile, self.region, self.stackname)
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self.md5 = None
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self.mode = 'CloudBender'
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self.provides = template
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self.cfn_template = None
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self.cfn_parameters = []
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self.cfn_data = None
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self.connection_manager = BotoConnection(self.profile, self.region)
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self.status = None
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self.dependencies = set()
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self.default_lock = None
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self.multi_delete = True
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def dump_config(self):
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logger.debug("<Stack {}: {}>".format(self.id, pprint.pformat(vars(self))))
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def read_config(self, sg_config={}):
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""" reads stack config """
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# First set various attributes based on parent stackgroup config
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self.tags.update(sg_config.get('tags', {}))
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self.parameters.update(sg_config.get('parameters', {}))
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self.options.update(sg_config.get('options', {}))
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if 'region' in sg_config:
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self.region = sg_config['region']
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if 'profile' in sg_config:
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self.profile = sg_config['profile']
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if 'notfication_sns' in sg_config:
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self.notfication_sns = sg_config['notfication_sns']
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_config = read_config_file(self.path, sg_config.get('variables', {}))
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for p in ["region", "stackname", "template", "default_lock", "multi_delete", "provides", "onfailure", "notification_sns"]:
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if p in _config:
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setattr(self, p, _config[p])
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for p in ["parameters", "tags"]:
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if p in _config:
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setattr(self, p, dict_merge(getattr(self, p), _config[p]))
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# Inject Artifact if not explicitly set
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if 'Artifact' not in self.tags:
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self.tags['Artifact'] = self.provides
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# backwards comp
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if 'vars' in _config:
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logger.warn("vars: in config is deprecated, please use options: instead")
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self.options = dict_merge(self.options, _config['vars'])
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if 'options' in _config:
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self.options = dict_merge(self.options, _config['options'])
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if 'Mode' in self.options:
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self.mode = self.options['Mode']
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if 'dependencies' in _config:
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for dep in _config['dependencies']:
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self.dependencies.add(dep)
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# Some sanity checks
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if self.onfailure not in ["DO_NOTHING", "ROLLBACK", "DELETE"]:
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raise ParameterIllegalValue("onfailure must be one of DO_NOTHING | ROLLBACK | DELETE")
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logger.debug("Stack {} added.".format(self.id))
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def render(self):
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"""Renders the cfn jinja template for this stack"""
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template_metadata = {
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'Template.Name': self.template,
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'Template.Hash': "__HASH__",
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'CloudBender.Version': __version__
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}
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_config = {'mode': self.mode, 'options': self.options, 'metadata': template_metadata}
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jenv = JinjaEnv(self.ctx['artifact_paths'])
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jenv.globals['_config'] = _config
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template = jenv.get_template('{0}{1}'.format(self.template, '.yaml.jinja'))
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logger.info('Rendering %s', template.filename)
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try:
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self.cfn_template = template.render(_config)
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self.cfn_data = yaml.safe_load(self.cfn_template)
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except Exception as e:
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# In case we rendered invalid yaml this helps to debug
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if self.cfn_template:
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_output = ""
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for i, line in enumerate(self.cfn_template.splitlines(), start=1):
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_output = _output + '{}: {}\n'.format(i, line)
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logger.error(_output)
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raise e
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if not re.search('CloudBender::', self.cfn_template) and not re.search('Iterate:', self.cfn_template):
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logger.info("CloudBender not required -> removing Transform and Conglomerate parameter")
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self.cfn_template = self.cfn_template.replace('Transform: [CloudBender]', '')
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_res = """
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Conglomerate:
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Type: String
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Description: Project / Namespace this stack is part of
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"""
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self.cfn_template = re.sub(_res, '', self.cfn_template)
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# Add Legacy FortyTwo resource to prevent AWS from replacing existing resources for NO reason ;-(
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include = []
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search_refs(self.cfn_data, include, self.mode)
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if self.mode != "Piped" and len(include) and self.options['Legacy']:
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_res = """
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FortyTwo:
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Type: Custom::FortyTwo
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Properties:
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ServiceToken:
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Fn::Sub: "arn:aws:lambda:${{AWS::Region}}:${{AWS::AccountId}}:function:FortyTwo"
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UpdateToken: __HASH__
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Include: {}""".format(sorted(set(include)))
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self.cfn_template = re.sub(r'Resources:', r'Resources:' + _res + '\n', self.cfn_template)
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logger.info("Legacy Mode -> added Custom::FortyTwo")
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elif self.mode == "Piped" and len(include):
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_res = ""
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for attr in include:
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_res = _res + """
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{0}:
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Type: String
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Description: Parameter to provide remote stack attribute {0}""".format(attr)
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self.cfn_template = re.sub(r'Parameters:', r'Parameters:' + _res + '\n', self.cfn_template)
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logger.info("Piped mode: Added parameters for remote stack references")
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# Re-read updated template
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self.cfn_data = yaml.safe_load(self.cfn_template)
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# Check for empty top level Parameters, Outputs and Conditions and remove
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for key in ['Parameters', 'Outputs', 'Conditions']:
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if key in self.cfn_data and not self.cfn_data[key]:
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del self.cfn_data[key]
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self.cfn_template = self.cfn_template.replace('\n' + key + ":", '')
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# Remove and condense multiple empty lines
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self.cfn_template = re.sub(r'\n\s*\n', '\n\n', self.cfn_template)
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self.cfn_template = re.sub(r'^\s*', '', self.cfn_template)
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self.cfn_template = re.sub(r'\s*$', '', self.cfn_template)
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# set md5 last
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self.md5 = hashlib.md5(self.cfn_template.encode('utf-8')).hexdigest()
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self.cfn_template = self.cfn_template.replace('__HASH__', self.md5)
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# Update internal data structures
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self._parse_metadata()
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def _parse_metadata(self):
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# Extract dependencies
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try:
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for dep in self.cfn_data['Metadata']['CloudBender']['Dependencies']:
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self.dependencies.add(dep)
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except KeyError:
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pass
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# Add CloudBender or FortyTwo dependencies
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include = []
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search_refs(self.cfn_data, include, self.mode)
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for ref in include:
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if self.mode != "Piped":
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self.dependencies.add(ref.split('.')[0])
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else:
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self.dependencies.add(ref.split('DoT')[0])
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def write_template_file(self):
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if self.cfn_template:
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yaml_file = os.path.join(self.ctx['template_path'], self.rel_path, self.stackname + ".yaml")
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self._ensure_dirs('template_path')
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with open(yaml_file, 'w') as yaml_contents:
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yaml_contents.write(self.cfn_template)
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logger.info('Wrote %s to %s', self.template, yaml_file)
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if len(self.cfn_template) > 51200:
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logger.warning("Rendered template exceeds maximum allowed size of 51200, actual size: {} !".format(len(self.cfn_template)))
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else:
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logger.error('No cfn template rendered yet for stack {}.'.format(self.stackname))
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def delete_template_file(self):
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yaml_file = os.path.join(self.ctx['template_path'], self.rel_path, self.stackname + ".yaml")
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try:
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os.remove(yaml_file)
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logger.debug('Deleted cfn template %s.', yaml_file)
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except OSError:
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pass
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def read_template_file(self):
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""" Reads rendered yaml template from disk and extracts metadata """
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if not self.cfn_template:
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yaml_file = os.path.join(self.ctx['template_path'], self.rel_path, self.stackname + ".yaml")
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with open(yaml_file, 'r') as yaml_contents:
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self.cfn_template = yaml_contents.read()
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logger.debug('Read cfn template %s.', yaml_file)
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self.cfn_data = yaml.safe_load(self.cfn_template)
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self._parse_metadata()
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else:
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logger.debug('Using cached cfn template %s.', self.stackname)
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def validate(self):
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"""Validates the rendered template via cfn-lint"""
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self.read_template_file()
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try:
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ignore_checks = self.cfn_data['Metadata']['cfnlint_ignore']
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except KeyError:
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ignore_checks = []
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# Ignore some more checks around injected parameters as we generate these
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if self.mode == "Piped":
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ignore_checks = ignore_checks + ['W2505', 'W2509', 'W2507']
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# Ignore checks regarding overloaded properties
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if self.mode == "CloudBender":
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ignore_checks = ignore_checks + ['E3035', 'E3002', 'E3012', 'W2001', 'E3001']
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filename = os.path.join(self.ctx['template_path'], self.rel_path, self.stackname + ".yaml")
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logger.info('Validating {0}'.format(filename))
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lint_args = ['--template', filename]
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if ignore_checks:
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lint_args.append('--ignore-checks')
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lint_args = lint_args + ignore_checks
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logger.info('Ignoring checks: {}'.format(','.join(ignore_checks)))
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(args, filenames, formatter) = cfnlint.core.get_args_filenames(lint_args)
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(template, rules, matches) = cfnlint.core.get_template_rules(filename, args)
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if not matches:
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matches.extend(cfnlint.core.run_cli(filename, template, rules, ['us-east-1'], None))
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if len(matches):
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for match in matches:
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logger.error(formatter._format(match))
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else:
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logger.info("Passed.")
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def resolve_parameters(self):
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""" Renders parameters for the stack based on the source template and the environment configuration """
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self.read_template_file()
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# if we run in Piped Mode, inspect all outputs of the running Conglomerate members
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if self.mode == "Piped":
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stack_outputs = {}
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try:
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stack_outputs = self._inspect_stacks(self.tags['Conglomerate'])
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except KeyError:
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pass
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if 'Parameters' in self.cfn_data:
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_errors = []
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self.cfn_parameters = []
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for p in self.cfn_data['Parameters']:
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# In Piped mode we try to resolve all Paramters first via stack_outputs
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if self.mode == "Piped":
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try:
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# first reverse the rename due to AWS alphanumeric restriction for parameter names
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_p = p.replace('DoT', '.')
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value = str(stack_outputs[_p])
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self.cfn_parameters.append({'ParameterKey': p, 'ParameterValue': value})
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logger.info('Got {} = {} from running stack'.format(p, value))
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continue
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except KeyError:
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pass
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# Key name in config tree is: stacks.<self.stackname>.parameters.<parameter>
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if p in self.parameters:
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value = str(self.parameters[p])
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self.cfn_parameters.append({'ParameterKey': p, 'ParameterValue': value})
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logger.info('{} {} Parameter {}={}'.format(self.region, self.stackname, p, value))
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else:
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# If we have a Default defined in the CFN skip, as AWS will use it
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if 'Default' not in self.cfn_data['Parameters'][p]:
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_errors.append(p)
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if _errors:
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raise ParameterNotFound('Cannot find value for parameters: {0}'.format(_errors))
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def write_parameter_file(self):
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parameter_file = os.path.join(self.ctx['parameter_path'], self.rel_path, self.stackname + ".yaml")
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# Render parameters as json for AWS CFN
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self._ensure_dirs('parameter_path')
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with open(parameter_file, 'w') as parameter_contents:
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parameter_contents.write(json.dumps(self.cfn_parameters, indent=2, separators=(',', ': '), sort_keys=True))
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logger.info('Wrote json parameters for %s to %s', self.stackname, parameter_file)
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if not self.cfn_parameters:
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# Make sure there are no parameters from previous runs
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if os.path.isfile(parameter_file):
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os.remove(parameter_file)
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def delete_parameter_file(self):
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parameter_file = os.path.join(self.ctx['parameter_path'], self.rel_path, self.stackname + ".yaml")
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try:
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os.remove(parameter_file)
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logger.debug('Deleted parameter %s.', parameter_file)
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except OSError:
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pass
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def create(self):
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"""Creates a stack """
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# Prepare parameters
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self.resolve_parameters()
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self.write_parameter_file()
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self.read_template_file()
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logger.info('Creating {0} {1}'.format(self.region, self.stackname))
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self.connection_manager.call(
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'cloudformation', 'create_stack',
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{'StackName': self.stackname,
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'TemplateBody': self.cfn_template,
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'Parameters': self.cfn_parameters,
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'OnFailure': self.onfailure,
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'NotificationARNs': self.notfication_sns,
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'Tags': [{"Key": str(k), "Value": str(v)} for k, v in self.tags.items()],
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'Capabilities': ['CAPABILITY_IAM', 'CAPABILITY_NAMED_IAM', 'CAPABILITY_AUTO_EXPAND']},
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profile=self.profile, region=self.region)
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return self._wait_for_completion()
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def update(self):
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"""Updates an existing stack """
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# Prepare parameters
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self.resolve_parameters()
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self.write_parameter_file()
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self.read_template_file()
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logger.info('Updating {0} {1}'.format(self.region, self.stackname))
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try:
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self.connection_manager.call(
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'cloudformation', 'update_stack',
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{'StackName': self.stackname,
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'TemplateBody': self.cfn_template,
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'Parameters': self.cfn_parameters,
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'NotificationARNs': self.notfication_sns,
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'Tags': [{"Key": str(k), "Value": str(v)} for k, v in self.tags.items()],
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'Capabilities': ['CAPABILITY_IAM', 'CAPABILITY_NAMED_IAM', 'CAPABILITY_AUTO_EXPAND']},
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profile=self.profile, region=self.region)
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except ClientError as e:
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if 'No updates are to be performed' in e.response['Error']['Message']:
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logger.info('No updates for {0}'.format(self.stackname))
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return StackStatus.COMPLETE
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else:
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raise e
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return self._wait_for_completion()
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def delete(self):
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"""Deletes a stack """
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logger.info('Deleting {0} {1}'.format(self.region, self.stackname))
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self.connection_manager.call(
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'cloudformation', 'delete_stack', {'StackName': self.stackname},
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profile=self.profile, region=self.region)
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return self._wait_for_completion()
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def create_change_set(self, change_set_name):
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""" Creates a Change Set with the name ``change_set_name``. """
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# Prepare parameters
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self.resolve_parameters()
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self.write_parameter_file()
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self.read_template_file()
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logger.info('Creating change set {0} for stack {1}'.format(change_set_name, self.stackname))
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self.connection_manager.call(
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'cloudformation', 'create_change_set',
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{'StackName': self.stackname,
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'ChangeSetName': change_set_name,
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'TemplateBody': self.cfn_template,
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'Parameters': self.cfn_parameters,
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'Tags': [{"Key": str(k), "Value": str(v)} for k, v in self.tags.items()],
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'Capabilities': ['CAPABILITY_IAM', 'CAPABILITY_NAMED_IAM']},
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profile=self.profile, region=self.region)
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return self._wait_for_completion()
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def describe(self):
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"""
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Returns the a description of the stack.
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:returns: A stack description.
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"""
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return self.connection_manager.call(
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"cloudformation",
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"describe_stacks",
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{"StackName": self.stackname},
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profile=self.profile, region=self.region)
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def get_status(self):
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"""
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Returns the stack's status.
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:returns: The stack's status.
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"""
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try:
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status = self.describe()["Stacks"][0]["StackStatus"]
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except ClientError as e:
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if e.response["Error"]["Message"].endswith("does not exist"):
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return None
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else:
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raise e
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return status
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def describe_events(self):
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"""
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Returns a dictionary contianing the stack events.
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:returns: The CloudFormation events for a stack.
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"""
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try:
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status = self.connection_manager.call(
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"cloudformation",
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"describe_stack_events",
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{"StackName": self.stackname},
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profile=self.profile, region=self.region)
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except ClientError as e:
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if e.response["Error"]["Message"].endswith("does not exist"):
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return None
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else:
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raise e
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return status
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def _wait_for_completion(self, timeout=0):
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"""
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Waits for a stack operation to finish. Prints CloudFormation events while it waits.
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:param timeout: Timeout before returning
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:returns: The final stack status.
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"""
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|
def timed_out(elapsed):
|
|
return elapsed >= timeout if timeout else False
|
|
|
|
status = StackStatus.IN_PROGRESS
|
|
|
|
self.most_recent_event_datetime = (
|
|
datetime.now(tzutc()) - timedelta(seconds=3)
|
|
)
|
|
elapsed = 0
|
|
while status == StackStatus.IN_PROGRESS and not timed_out(elapsed):
|
|
status = self._get_simplified_status(self.get_status())
|
|
if not status:
|
|
return None
|
|
|
|
self._log_new_events()
|
|
time.sleep(4)
|
|
elapsed += 4
|
|
|
|
return status
|
|
|
|
@staticmethod
|
|
def _get_simplified_status(status):
|
|
""" Returns the simplified Stack Status. """
|
|
if status:
|
|
if status.endswith("ROLLBACK_COMPLETE"):
|
|
return StackStatus.FAILED
|
|
elif status.endswith("_COMPLETE"):
|
|
return StackStatus.COMPLETE
|
|
elif status.endswith("_IN_PROGRESS"):
|
|
return StackStatus.IN_PROGRESS
|
|
elif status.endswith("_FAILED"):
|
|
return StackStatus.FAILED
|
|
else:
|
|
return 'Unknown'
|
|
|
|
def _log_new_events(self):
|
|
"""
|
|
Log the latest stack events while the stack is being built.
|
|
"""
|
|
events = self.describe_events()
|
|
if events:
|
|
events = events["StackEvents"]
|
|
events.reverse()
|
|
new_events = [
|
|
event for event in events
|
|
if event["Timestamp"] > self.most_recent_event_datetime
|
|
]
|
|
for event in new_events:
|
|
logger.info(" ".join([
|
|
self.region,
|
|
self.stackname,
|
|
event["LogicalResourceId"],
|
|
event["ResourceType"],
|
|
event["ResourceStatus"],
|
|
event.get("ResourceStatusReason", "")
|
|
]))
|
|
self.most_recent_event_datetime = event["Timestamp"]
|
|
|
|
def _ensure_dirs(self, path):
|
|
# Ensure output dirs exist
|
|
if not os.path.exists(os.path.join(self.ctx[path], self.rel_path)):
|
|
os.makedirs(os.path.join(self.ctx[path], self.rel_path))
|
|
|
|
# stackoutput inspection
|
|
def _inspect_stacks(self, conglomerate):
|
|
# Get all stacks of the conglomertate
|
|
running_stacks = self.connection_manager.call(
|
|
"cloudformation",
|
|
"describe_stacks",
|
|
profile=self.profile, region=self.region)
|
|
|
|
stacks = []
|
|
for stack in running_stacks['Stacks']:
|
|
for tag in stack['Tags']:
|
|
if tag['Key'] == 'Conglomerate' and tag['Value'] == conglomerate:
|
|
stacks.append(stack)
|
|
break
|
|
|
|
# Gather stack outputs, use Tag['Artifact'] as name space: Artifact.OutputName, same as FortyTwo
|
|
stack_outputs = {}
|
|
for stack in stacks:
|
|
# If stack has an Artifact Tag put resources into the namespace Artifact.Resource
|
|
artifact = None
|
|
for tag in stack['Tags']:
|
|
if tag['Key'] == 'Artifact':
|
|
artifact = tag['Value']
|
|
|
|
if artifact:
|
|
key_prefix = "{}.".format(artifact)
|
|
else:
|
|
key_prefix = ""
|
|
|
|
try:
|
|
for output in stack['Outputs']:
|
|
# Gather all outputs of the stack into one dimensional key=value structure
|
|
stack_outputs[key_prefix + output['OutputKey']] = output['OutputValue']
|
|
except KeyError:
|
|
pass
|
|
|
|
# Add outputs from stacks into the data for jinja under StackOutput
|
|
return stack_outputs
|