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extension.py
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extension.py
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# -*- coding: utf-8 -*-
from overlay import MessageNotHandledError
class ComponentManager:
modules = [ ]
@staticmethod
def load(data):
errors = [ ]
for d in data:
try:
m = getattr(
__import__('components.' + d['name'], fromlist=['*']),
d['class'])
except ImportError as e:
errors.append(
"Couldn't load module %s: %s" % (d['class'], str(e)))
else:
print ' > Loading %s' % (d['name'])
ComponentManager.modules.append(m)
if len(errors) > 0:
for e in errors:
print e
@staticmethod
def register(overlay):
print '-+- Registering modules -+-'
for m in ComponentManager.modules:
print ' > %s registered' % (m.getSubject())
overlay.addKindHandler(m.getSubject())
class PrivateMethodCallError(Exception):
pass
class BadMethodCallError(Exception):
pass
class ManagementComponent:
def __init__(self, transport=None):
self.transport = transport
@staticmethod
def getSubject():
raise NotImplementedError
def handle(self, message):
theCall = message.getBody().getAttribute("call")
try:
assert (theCall[:2] != '__')
getattr(self, theCall)(message)
except AssertionError:
raise PrivateMethodCallError, '''%s called through %s''' % (
theCall, message.toprettyxml())
except AttributeError as e:
raise AttributeError, '''%s called through %s''' % (
theCall, message.toprettyxml())
except RuntimeError as e:
raise e
except Exception as e:
raise BadMethodCallError, '''%s called through %s''' % (
theCall, message.toprettyxml())
class PluginManager:
plugins = { }
@staticmethod
def load(data):
errors = [ ]
for d in data:
try:
m = getattr(
__import__('plugins.' + d['name'], fromlist=['*']),
d['class'])
except ImportError as e:
errors.append(
"Couldn't load plug-in %s: %s" % (d['class'], str(e)))
else:
print ' > Loading %s' % (d['name'])
PluginManager.plugins[d['name']] = m
if len(errors) > 0:
for e in errors:
print e
class PlugIn:
pass