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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__)
class HelperModule(Bcfg2.Server.Plugin.SpecificData):
_module_name_re = re.compile(r'([^/]+?)\.py')
def __init__(self, name, specific, encoding):
Bcfg2.Server.Plugin.SpecificData.__init__(self, name, specific,
encoding)
match = self._module_name_re.search(self.name)
if match:
self._module_name = match.group(1)
else:
self._module_name = name
self._attrs = []
def handle_event(self, event):
Bcfg2.Server.Plugin.SpecificData.handle_event(self, event)
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
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))
setattr(self, sym, getattr(module, sym))
# remove old exports
for sym in set(self._attrs) - set(module.__export__):
delattr(self, sym)
self._attrs = module.__export__
class HelperSet(Bcfg2.Server.Plugin.EntrySet):
ignore = re.compile("^(\.#.*|.*~|\\..*\\.(sw[px])|.*\.py[co])$")
fpattern = '[0-9A-Za-z_\-]+\.py'
def __init__(self, path, fam, encoding, plugin_name):
self.plugin_name = plugin_name
Bcfg2.Server.Plugin.EntrySet.__init__(self, self.fpattern, path,
HelperModule, encoding,
is_regex=True)
fam.AddMonitor(path, self)
def HandleEvent(self, event):
if (event.filename != self.path and
not self.ignore.match(event.filename)):
return self.handle_event(event)
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)
try:
self.helpers = HelperSet(self.data, core.fam, core.encoding,
self.name)
except:
raise Bcfg2.Server.Plugin.PluginInitError
def get_additional_data(self, metadata):
return dict([(h._module_name, h)
for h in list(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", None, None)
self.reserved_keywords = dir(hm)
def Run(self):
for helper in glob.glob(os.path.join(self.config['repo'],
"TemplateHelper",
"*.py")):
if not self.HandlesFile(helper):
continue
self.check_helper(helper)
def check_helper(self, helper):
match = HelperModule._module_name_re.search(helper)
if match:
module_name = match.group(1)
else:
module_name = helper
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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