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import re
import imp
import sys
import glob
import logging
import Bcfg2.Server.Lint
import Bcfg2.Server.Plugin
logger = logging.getLogger(__name__)
module_pattern = r'(?P<filename>(?P<module>[^\/]+)\.py)$'
module_re = re.compile(module_pattern)
class HelperModule(Bcfg2.Server.Plugin.FileBacked):
def __init__(self, name, fam=None):
Bcfg2.Server.Plugin.FileBacked.__init__(self, name, fam=fam)
self._module_name = module_re.search(self.name).group('module')
self._attrs = []
def Index(self):
try:
module = imp.load_source(self._module_name, self.name)
except:
err = sys.exc_info()[1]
logger.error("TemplateHelper: Failed to import %s: %s" %
(self.name, err))
return
if not hasattr(module, "__export__"):
logger.error("TemplateHelper: %s has no __export__ list" %
self.name)
return
newattrs = []
for sym in module.__export__:
if sym not in self._attrs and hasattr(self, sym):
logger.warning("TemplateHelper: %s: %s is a reserved keyword, "
"skipping export" % (self.name, sym))
continue
try:
setattr(self, sym, getattr(module, sym))
newattrs.append(sym)
except AttributeError:
logger.warning("TemplateHelper: %s: %s exports %s, but has no "
"such attribute" % (self.name, sym))
# remove old exports
for sym in set(self._attrs) - set(newattrs):
delattr(self, sym)
self._attrs = newattrs
class HelperSet(Bcfg2.Server.Plugin.DirectoryBacked):
ignore = re.compile("^(\.#.*|.*~|\\..*\\.(sw[px])|.*\.py[co])$")
patterns = module_re
__child__ = HelperModule
class TemplateHelper(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Connector):
""" A plugin to provide helper classes and functions to templates """
name = 'TemplateHelper'
__author__ = 'chris.a.st.pierre@gmail.com'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Connector.__init__(self)
self.helpers = HelperSet(self.data, core.fam)
def get_additional_data(self, _):
return dict([(h._module_name, h)
for h in self.helpers.entries.values()])
class TemplateHelperLint(Bcfg2.Server.Lint.ServerlessPlugin):
""" find duplicate Pkgmgr entries with the same priority """
def __init__(self, *args, **kwargs):
Bcfg2.Server.Lint.ServerlessPlugin.__init__(self, *args, **kwargs)
hm = HelperModule("foo.py")
self.reserved_keywords = dir(hm)
def Run(self):
for fname in os.listdir(os.path.join(self.config['repo'],
"TemplateHelper")):
helper = os.path.join(self.config['repo'], "TemplateHelper",
fname)
if not module_re.search(helper) or not self.HandlesFile(helper):
continue
self.check_helper(helper)
def check_helper(self, helper):
module_name = module_re.search(helper).group(1)
try:
module = imp.load_source(module_name, helper)
except:
err = sys.exc_info()[1]
self.LintError("templatehelper-import-error",
"Failed to import %s: %s" %
(helper, err))
return
if not hasattr(module, "__export__"):
self.LintError("templatehelper-no-export",
"%s has no __export__ list" % helper)
return
elif not isinstance(module.__export__, list):
self.LintError("templatehelper-nonlist-export",
"__export__ is not a list in %s" % helper)
return
for sym in module.__export__:
if not hasattr(module, sym):
self.LintError("templatehelper-nonexistent-export",
"%s: exported symbol %s does not exist" %
(helper, sym))
elif sym in self.reserved_keywords:
self.LintError("templatehelper-reserved-export",
"%s: exported symbol %s is reserved" %
(helper, sym))
elif sym.startswith("_"):
self.LintError("templatehelper-underscore-export",
"%s: exported symbol %s starts with underscore" %
(helper, sym))
@classmethod
def Errors(cls):
return {"templatehelper-import-error":"error",
"templatehelper-no-export":"error",
"templatehelper-nonlist-export":"error",
"templatehelper-nonexistent-export":"error",
"templatehelper-reserved-export":"error",
"templatehelper-underscore-export":"warning"}
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