138 lines
5.0 KiB
Python
138 lines
5.0 KiB
Python
#!/usr/bin/env python
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# Copyright (C) 2015 OpenStack, LLC.
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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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# Manage interpolation of JJB variables into template strings.
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import logging
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from pprint import pformat
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import re
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from string import Formatter
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from jenkins_jobs.errors import JenkinsJobsException
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from jenkins_jobs.local_yaml import CustomLoader
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logger = logging.getLogger(__name__)
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def deep_format(obj, paramdict, allow_empty=False):
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"""Apply the paramdict via str.format() to all string objects found within
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the supplied obj. Lists and dicts are traversed recursively."""
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# YAML serialisation was originally used to achieve this, but that places
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# limitations on the values in paramdict - the post-format result must
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# still be valid YAML (so substituting-in a string containing quotes, for
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# example, is problematic).
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if hasattr(obj, 'format'):
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try:
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ret = CustomFormatter(allow_empty).format(obj, **paramdict)
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except KeyError as exc:
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missing_key = exc.args[0]
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desc = "%s parameter missing to format %s\nGiven:\n%s" % (
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missing_key, obj, pformat(paramdict))
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raise JenkinsJobsException(desc)
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except Exception:
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logging.error("Problem formatting with args:\nallow_empty:"
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"%s\nobj: %s\nparamdict: %s" %
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(allow_empty, obj, paramdict))
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raise
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elif isinstance(obj, list):
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ret = type(obj)()
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for item in obj:
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ret.append(deep_format(item, paramdict, allow_empty))
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elif isinstance(obj, dict):
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ret = type(obj)()
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for item in obj:
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try:
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ret[CustomFormatter(allow_empty).format(item, **paramdict)] = \
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deep_format(obj[item], paramdict, allow_empty)
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except KeyError as exc:
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missing_key = exc.args[0]
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desc = "%s parameter missing to format %s\nGiven:\n%s" % (
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missing_key, obj, pformat(paramdict))
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raise JenkinsJobsException(desc)
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except Exception:
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logging.error("Problem formatting with args:\nallow_empty:"
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"%s\nobj: %s\nparamdict: %s" %
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(allow_empty, obj, paramdict))
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raise
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else:
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ret = obj
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if isinstance(ret, CustomLoader):
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# If we have a CustomLoader here, we've lazily-loaded a template;
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# attempt to format it.
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ret = deep_format(ret, paramdict, allow_empty=allow_empty)
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return ret
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class CustomFormatter(Formatter):
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"""
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Custom formatter to allow non-existing key references when formatting a
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string
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"""
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_expr = """
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(?<!{){({{)* # non-pair opening {
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(?:obj:)? # obj:
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(?P<key>\w+) # key
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(?:\|(?P<default>[^}]*))? # default fallback
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}(}})*(?!}) # non-pair closing }
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"""
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def __init__(self, allow_empty=False):
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super(CustomFormatter, self).__init__()
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self.allow_empty = allow_empty
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def vformat(self, format_string, args, kwargs):
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matcher = re.compile(self._expr, re.VERBOSE)
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# special case of returning the object if the entire string
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# matches a single parameter
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try:
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result = re.match('^%s$' % self._expr, format_string, re.VERBOSE)
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except TypeError:
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return format_string.format(**kwargs)
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if result is not None:
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try:
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return kwargs[result.group("key")]
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except KeyError:
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pass
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# handle multiple fields within string via a callback to re.sub()
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def re_replace(match):
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key = match.group("key")
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default = match.group("default")
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if default is not None:
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if key not in kwargs:
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return default
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else:
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return "{%s}" % key
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return match.group(0)
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format_string = matcher.sub(re_replace, format_string)
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return Formatter.vformat(self, format_string, args, kwargs)
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def get_value(self, key, args, kwargs):
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try:
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return Formatter.get_value(self, key, args, kwargs)
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except KeyError:
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if self.allow_empty:
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logger.debug(
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'Found uninitialized key %s, replaced with empty string',
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key
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)
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return ''
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raise
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