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# handlers module
import new
import sys
DEFAULT_HANDLERS = [
'londiste.handlers.qtable',
'londiste.handlers.applyfn',
'londiste.handlers.shard',
'londiste.handlers.multimaster',
'londiste.handlers.vtable',
'londiste.handlers.bulk',
'londiste.handlers.dispatch',
]
def handler_args(name, cls):
"""Handler arguments initialization decorator
Define successor for handler class cls with func as argument generator
"""
def wrapper(func):
def _init_override(self, table_name, args, dest_table):
cls.__init__(self, table_name, func(args.copy()), dest_table)
dct = {'__init__': _init_override, 'handler_name': name}
module = sys.modules[cls.__module__]
newname = '%s_%s' % (cls.__name__, name.replace('.','_'))
newcls = new.classobj(newname, (cls,), dct)
setattr(module, newname, newcls)
module.__londiste_handlers__.append(newcls)
module.__all__.append(newname)
return func
return wrapper
def update(*p):
""" Update dicts given in params with its predecessor param dict
in reverse order """
return reduce(lambda x, y: x.update(y) or x,
(p[i] for i in range(len(p)-1,-1,-1)), {})
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