Toolset to render and manage AWS CloudFormation ( https://pypi.org/project/cloudbender )
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import os
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import io
import gzip
import re
import base64
import yaml
import jinja2
from jinja2.utils import missing, object_type_repr
from jinja2._compat import string_types
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import pyminifier.token_utils
import pyminifier.minification
import pyminifier.compression
import pyminifier.obfuscate
import types
import logging
logger = logging.getLogger(__name__)
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@jinja2.contextfunction
def cloudbender_ctx(context, cb_ctx={}, reset=False, command=None, args={}):
# Reset state
if reset:
cb_ctx.clear()
return
if 'dependencies' not in cb_ctx:
cb_ctx['dependencies'] = set()
if 'mandatory_parameters' not in cb_ctx:
cb_ctx['mandatory_parameters'] = set()
if command == 'get_dependencies':
_deps = sorted(list(cb_ctx['dependencies']))
if _deps:
logger.debug("Stack depencies: {}".format(','.join(_deps)))
return _deps
elif command == 'add_dependency':
try:
cb_ctx['dependencies'].add(args['dep'])
logger.debug("Adding stack depency to {}".format(args['dep']))
except KeyError:
pass
else:
raise("Unknown command")
@jinja2.contextfunction
def get_custom_att(context, att=None, ResourceName="FortyTwo", attributes={}, reset=False, dump=False):
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""" Returns the rendered required fragement and also collects all foreign
attributes for the specified CustomResource to include them later in
the actual CustomResource include property """
# Reset state
if reset:
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attributes.clear()
return
# return all registered attributes
if dump:
return attributes
# If called with an attribute, return fragement and register dependency
if att:
config = context.get_all()['_config']
if ResourceName not in attributes:
attributes[ResourceName] = set()
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attributes[ResourceName].add(att)
if ResourceName == 'FortyTwo':
cloudbender_ctx(context, command='add_dependency', args={'dep': att.split('.')[0]})
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if config['cfn']['Mode'] == "FortyTwo":
return('{{ "Fn::GetAtt": ["{0}", "{1}"] }}'.format(ResourceName, att))
elif config['cfn']['Mode'] == "AWSImport" and ResourceName == "FortyTwo":
# AWS only allows - and :, so replace '.' with ":"
return('{{ "Fn::ImportValue": {{ "Fn::Sub": "${{Conglomerate}}:{0}" }} }}'.format(att.replace('.', ':')))
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else:
# We need to replace . with some PureAlphaNumeric thx AWS ...
return('{{ Ref: {0} }}'.format(att.replace('.', 'DoT')))
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@jinja2.contextfunction
def include_raw_gz(context, files=None, gz=True):
jenv = context.environment
output = ''
for name in files:
output = output + jinja2.Markup(jenv.loader.get_source(jenv, name)[0])
# logger.debug(output)
if not gz:
return(output)
buf = io.BytesIO()
f = gzip.GzipFile(mode='w', fileobj=buf, mtime=0)
f.write(output.encode())
f.close()
return base64.b64encode(buf.getvalue()).decode('utf-8')
@jinja2.contextfunction
def render_once(context, name=None, resources=set(), reset=False):
""" Utility function returning True only once per name """
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if reset:
resources.clear()
return
if name and name not in resources:
resources.add(name)
return True
return False
@jinja2.contextfunction
def raise_helper(context, msg):
raise Exception(msg)
# Custom tests
def regex(value='', pattern='', ignorecase=False, match_type='search'):
''' Expose `re` as a boolean filter using the `search` method by default.
This is likely only useful for `search` and `match` which already
have their own filters.
'''
if ignorecase:
flags = re.I
else:
flags = 0
_re = re.compile(pattern, flags=flags)
if getattr(_re, match_type, 'search')(value) is not None:
return True
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return False
def match(value, pattern='', ignorecase=False):
''' Perform a `re.match` returning a boolean '''
return regex(value, pattern, ignorecase, 'match')
def search(value, pattern='', ignorecase=False):
''' Perform a `re.search` returning a boolean '''
return regex(value, pattern, ignorecase, 'search')
# Custom filters
def regex_replace(value='', pattern='', replace='', ignorecase=False):
if ignorecase:
flags = re.I
else:
flags = 0
return re.sub(pattern, replace, value, flags=flags)
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def pyminify(source, obfuscate=False, minify=True):
# pyminifier options
options = types.SimpleNamespace(
tabs=False, replacement_length=1, use_nonlatin=0,
obfuscate=0, obf_variables=1, obf_classes=0, obf_functions=0,
obf_import_methods=0, obf_builtins=0)
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tokens = pyminifier.token_utils.listified_tokenizer(source)
if minify:
source = pyminifier.minification.minify(tokens, options)
tokens = pyminifier.token_utils.listified_tokenizer(source)
if obfuscate:
name_generator = pyminifier.obfuscate.obfuscation_machine(use_unicode=False)
pyminifier.obfuscate.obfuscate("__main__", tokens, options, name_generator=name_generator)
# source = pyminifier.obfuscate.apply_obfuscation(source)
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source = pyminifier.token_utils.untokenize(tokens)
# logger.info(source)
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minified_source = pyminifier.compression.gz_pack(source)
logger.info("Compressed python code to {}".format(len(minified_source)))
return minified_source
def parse_yaml(block):
return yaml.safe_load(block)
class SilentUndefined(jinja2.Undefined):
'''
Log warning for undefiend but continue
'''
def _fail_with_undefined_error(self, *args, **kwargs):
if self._undefined_hint is None:
if self._undefined_obj is missing:
hint = '%r is undefined' % self._undefined_name
elif not isinstance(self._undefined_name, string_types):
hint = '%s has no element %r' % (
object_type_repr(self._undefined_obj),
self._undefined_name
)
else:
hint = '%r has no attribute %r' % (
object_type_repr(self._undefined_obj),
self._undefined_name
)
else:
hint = self._undefined_hint
logger.warning("Undefined variable: {}".format(hint))
return ''
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def JinjaEnv(template_locations=[]):
jenv = jinja2.Environment(trim_blocks=True,
lstrip_blocks=True,
undefined=SilentUndefined,
extensions=['jinja2.ext.loopcontrols', 'jinja2.ext.do'])
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jinja_loaders = []
for _dir in template_locations:
jinja_loaders.append(jinja2.FileSystemLoader(_dir))
jenv.loader = jinja2.ChoiceLoader(jinja_loaders)
jenv.globals['include_raw'] = include_raw_gz
jenv.globals['get_custom_att'] = get_custom_att
jenv.globals['cloudbender_ctx'] = cloudbender_ctx
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jenv.globals['render_once'] = render_once
jenv.globals['raise'] = raise_helper
jenv.filters['regex_replace'] = regex_replace
jenv.filters['pyminify'] = pyminify
jenv.filters['yaml'] = parse_yaml
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jenv.tests['match'] = match
jenv.tests['regex'] = regex
jenv.tests['search'] = search
return jenv
def read_config_file(path, jinja_args=None):
""" reads yaml config file, passes it through jinja and returns data structre """
if os.path.exists(path):
logger.debug("Reading config file: {}".format(path))
try:
jenv = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(path)),
undefined=jinja2.StrictUndefined,
extensions=['jinja2.ext.loopcontrols'])
template = jenv.get_template(os.path.basename(path))
rendered_template = template.render(
env=os.environ
)
data = yaml.safe_load(rendered_template)
if data:
return data
except Exception as e:
logger.exception("Error reading config file: {} ({})".format(path, e))
return {}