在python中序列化suds对象

时间:2010-03-09 20:54:09

标签: python soap pickle suds

好的我正在努力改进python,所以我不确定这是我正在做的事情的正确方法,但这是我目前的问题......

我需要通过SOAP方法获取一些信息,现在只使用部分信息,但将整个结果存储起来以备将来使用(我们需要尽可能少地使用该服务)。查找访问服务的最佳方式我认为suds是要走的路,它很简单,就像获取数据的魅力一样。但是现在我想以某种方式保存结果,最好是序列化/在数据库中,这样我以后可以把它拉出来并使用它。

最好的方法是什么,看起来像pickle / json不是一个选择?谢谢!

更新 阅读How can I pickle suds results?的最佳答案让我更好地了解为什么这不是一个选项,我想我是在用我需要的信息重新创建一个基本对象?

6 个答案:

答案 0 :(得分:32)

我一直在使用以下方法将Suds对象转换为JSON:

from suds.sudsobject import asdict

def recursive_asdict(d):
    """Convert Suds object into serializable format."""
    out = {}
    for k, v in asdict(d).iteritems():
        if hasattr(v, '__keylist__'):
            out[k] = recursive_asdict(v)
        elif isinstance(v, list):
            out[k] = []
            for item in v:
                if hasattr(item, '__keylist__'):
                    out[k].append(recursive_asdict(item))
                else:
                    out[k].append(item)
        else:
            out[k] = v
    return out

def suds_to_json(data):
    return json.dumps(recursive_asdict(data))

答案 1 :(得分:6)

是的,我确认了你在你提到的答案中给出的解释 - 动态生成的类不容易被选择(也不容易序列化),你需要提取所有的状态信息,pickle 那个状态,如果你真的坚持使用它,就会重新检索棘手的漏洞对象; - )。

答案 2 :(得分:5)

我为suds的Object intance做了一个虚拟类的实现,然后能够序列化。 FakeSudsInstance的行为类似于原始的Suds Object实例,见下文:

from suds.sudsobject import Object as SudsObject

class FakeSudsNode(SudsObject):

    def __init__(self, data):
        SudsObject.__init__(self)
        self.__keylist__ = data.keys()
        for key, value in data.items():
            if isinstance(value, dict):
                setattr(self, key, FakeSudsNode(value))
            elif isinstance(value, list):
                l = []
                for v in value:
                    if isinstance(v, list) or isinstance(v, dict):
                        l.append(FakeSudsNode(v))
                    else:
                        l.append(v)
                setattr(self, key, l)
            else:
                setattr(self, key, value)


class FakeSudsInstance(SudsObject):

    def __init__(self, data):
        SudsObject.__init__(self)
        self.__keylist__ = data.keys()
        for key, value in data.items():
            if isinstance(value, dict):
                setattr(self, key, FakeSudsNode(value))
            else:
                setattr(self, key, value)

    @classmethod
    def build_instance(cls, instance):
        suds_data = {}
        def node_to_dict(node, node_data):
            if hasattr(node, '__keylist__'):
                keys = node.__keylist__
                for key in keys:
                    if isinstance(node[key], list):
                        lkey = key.replace('[]', '')
                        node_data[lkey] = node_to_dict(node[key], [])
                    elif hasattr(node[key], '__keylist__'):
                        node_data[key] = node_to_dict(node[key], {})
                    else:
                        if isinstance(node_data, list):
                            node_data.append(node[key])
                        else:
                            node_data[key] = node[key]
                return node_data
            else:
                if isinstance(node, list):
                    for lnode in node:
                        node_data.append(node_to_dict(lnode, {}))
                    return node_data
                else:
                    return node
        node_to_dict(instance, suds_data)
        return cls(suds_data)

现在,在suds电话之后,例如下面:

# Now, after a suds call, for example below
>>> import cPickle as pickle
>>> suds_intance = client.service.SomeCall(account, param)
>>> fake_suds = FakeSudsInstance.build_instance(suds_intance)
>>> dumped = pickle.dumps(fake_suds)
>>> loaded = pickle.loads(dumped)

我希望它有所帮助。

答案 3 :(得分:2)

以下是我在研究和找到答案之前提出的问题。这对我来说非常适用于复杂的suds响应以及其他对象,例如__builtins__,因为解决方案是suds不可知的:

import datetime

def object_to_dict(obj):
    if isinstance(obj, (str, unicode, bool, int, long, float, datetime.datetime, datetime.date, datetime.time)):
        return obj
    data_dict = {}
    try:
        all_keys = obj.__dict__.keys()  # vars(obj).keys()
    except AttributeError:
        return obj
    fields = [k for k in all_keys if not k.startswith('_')]
    for field in fields:
        val = getattr(obj, field)
        if isinstance(val, (list, tuple)):
            data_dict[field] = []
            for item in val:
                data_dict[field].append(object_to_dict(item))
        else:
            data_dict[field] = object_to_dict(val)
    return data_dict

此解决方案有效且实际上更快。它也适用于没有__keylist__属性的对象。

我在复杂的suds输出对象上运行了100次基准测试,此解决方案运行时间为0.04到.052秒(平均0.045724287)。虽然上面的recursive_asdict解决方案在.082到0.102秒内运行,所以几乎翻倍(平均0.0829765582)。

然后我回到绘图板并重新执行该功能以获得更多性能,并且它不需要datetime导入。我利用__keylist__属性,因此这不适用于__builtins__等其他对象,但对于suds对象输出效果很好:

def fastest_object_to_dict(obj):
    if not hasattr(obj, '__keylist__'):
        return obj
    data = {}
    fields = obj.__keylist__
    for field in fields:
        val = getattr(obj, field)
        if isinstance(val, list):  # tuple not used
            data[field] = []
            for item in val:
                data[field].append(fastest_object_to_dict(item))
        else:
            data[field] = fastest_object_to_dict(val)
    return data

运行时间为0.18 - 0.033秒(平均0.0260889721),因此比recursive_asdict解决方案快4倍。

答案 4 :(得分:2)

上面提到的解决方案丢失了有关类名的有价值的信息 - 它在某些库中很有价值,例如DFP客户端https://github.com/googleads/googleads-python-lib,其中实体类型可能以动态生成的类名编码(即 TemplateCreative / <强> ImageCreative

这里是我使用的解决方案,它保留了类名并恢复了dict-serialized对象而没有数据丢失(除了 suds.sax.text.Text ,它将被转换为常规的unicode对象和也许还有一些其他类型我还没碰到过)

from suds.sudsobject import asdict, Factory as SudsFactory

def suds2dict(d):                                                               
    """                                                                         
    Suds object serializer 
    Borrowed from https://stackoverflow.com/questions/2412486/serializing-a-suds-object-in-python/15678861#15678861                                                     
    """                                                                         
    out = {'__class__': d.__class__.__name__}                                   
    for k, v in asdict(d).iteritems():                                          
        if hasattr(v, '__keylist__'):                                           
            out[k] = suds2dict(v)                                               
        elif isinstance(v, list):                                               
            out[k] = []                                                         
            for item in v:                                                      
                if hasattr(item, '__keylist__'):                                
                    out[k].append(suds2dict(item))                              
                else:                                                           
                    out[k].append(item)                                         
        else:                                                                   
            out[k] = v                                                          
    return out                                                                  


def dict2suds(d):                                                               
    """                                                                         
    Suds object deserializer                                                    
    """                                                                         
    out = {}                                                                    
    for k, v in d.iteritems():                                                  
        if isinstance(v, dict):                                                 
            out[k] = dict2suds(v)                                               
        elif isinstance(v, list):                                               
            out[k] = []                                                         
            for item in v:                                                      
                if isinstance(item, dict):                                      
                    out[k].append(dict2suds(item))                              
                else:                                                           
                    out[k].append(item)                                         
        else:                                                                   
            out[k] = v                                                          
    return SudsFactory.object(out.pop('__class__'), out)  

答案 5 :(得分:1)

我更新了recursive_asdict示例followed this tutorial以与python3兼容(items而不是iteritems)。

from suds.sudsobject import asdict
from suds.sax.text import Text

def recursive_asdict(d):
    """
    Recursively convert Suds object into dict.
    We convert the keys to lowercase, and convert sax.Text
    instances to Unicode.

    Taken from:
    https://stackoverflow.com/a/15678861/202168

    Let's create a suds object from scratch with some lists and stuff
    >>> from suds.sudsobject import Object as SudsObject
    >>> sudsobject = SudsObject()
    >>> sudsobject.Title = "My title"
    >>> sudsobject.JustAList = [1, 2, 3]
    >>> sudsobject.Child = SudsObject()
    >>> sudsobject.Child.Title = "Child title"
    >>> sudsobject.Child.AnotherList = ["4", "5", "6"]
    >>> childobject = SudsObject()
    >>> childobject.Title = "Another child title"
    >>> sudsobject.Child.SudObjectList = [childobject]

    Now see if this works:
    >>> result = recursive_asdict(sudsobject)
    >>> result['title']
    'My title'
    >>> result['child']['anotherlist']
    ['4', '5', '6']
   """
    out = {}
    for k, v in asdict(d).items():
        k = k.lower()
        if hasattr(v, '__keylist__'):
            out[k] = recursive_asdict(v)
        elif isinstance(v, list):
            out[k] = []
            for item in v:
                if hasattr(item, '__keylist__'):
                    out[k].append(recursive_asdict(item))
                else:
                    out[k].append(
                        item.title() if isinstance(item, Text) else item)
        else:
            out[k] = v.title() if isinstance(v, Text) else v
    return out