Source code for hyperstream.utils.serialization

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import types
import marshal


[docs]def func_dump(func): """ Serialize user defined function. :param func: The function :return: Tuple of code, defaults and closure """ code = marshal.dumps(func.func_code) defaults = func.__defaults__ if func.__closure__: closure = tuple(c.cell_contents for c in func.__closure__) else: closure = None return code, defaults, closure
[docs]def func_load(code, defaults=None, closure=None, globs=None): """ Reload a function :param code: The code object :param defaults: Default values :param closure: The closure :param globs: globals :return: """ if isinstance(code, (tuple, list)): # unpack previous dump code, defaults, closure = code code = marshal.loads(code) if closure is not None: closure = func_reconstruct_closure(closure) if globs is None: globs = globals() return types.FunctionType(code, globs, name=code.co_name, argdefs=defaults, closure=closure)
[docs]def func_reconstruct_closure(values): """ Deserialization helper that reconstructs a closure :param values: The closure values :return: The closure """ nums = range(len(values)) src = ["def func(arg):"] src += [" _%d = arg[%d]" % (n, n) for n in nums] src += [" return lambda:(%s)" % ','.join(["_%d" % n for n in nums]), ""] src = '\n'.join(src) try: exec(src, globals()) except: raise SyntaxError(src) return func(values).__closure__