python - PyRal 获取附件

Question

我有一个相当简单的用例，但我不理解我收到的错误消息。

我正在使用请求和 pyral 模块，pyral ( http://pyral.readthedocs.io/en/latest/interface.html# ) 实际上只是 Rally 的 Restful api 的包装器。我的目标是从 Rally(CA 产品)UserStory 获取文件(附件)并将其存储到本地文件系统。

对于上下文，这是我的环境设置(验证 Rally 并创建一个对象)。我显然已经删除了身份验证信息。

from pyral import Rally, rallyWorkset

options = [arg for arg in sys.argv[1:] if arg.startswith('--')]
args = [arg for arg in sys.argv[1:] if arg not in options]
server, user, password, apikey, workspace, project = rallyWorkset(options)
rally = Rally(server='rally1.rallydev.com', 
user='**********', password='***********', 
          apikey="**************",
          workspace='**************', project='**************',
          server_ping=False)

之后，我得到了一个用户故事的响应对象(参见 US845 的查询)，我这样做只是为了简化问题。

r = rally.get('UserStory', fetch = True, projectScopeDown=True, query = 'FormattedID = US845')

然后我使用内置迭代器从 RallyRESTResponse 对象获取用户故事。

us = r.next()

从那里感觉我应该能够轻松地使用接受工件(我们)和文件名(附件名称)的 getAttachment() 方法。我可以使用 getAttachmentNames(us) 返回附件名称列表。当我尝试类似的东西时出现问题

attachment_names = rally.getAttachmentNames(us) #get attachments for this UserStory
attachment_file = rally.getAttachment(us, attachment_names[0]) #Try to get the first attachment 

返回这样的错误

Traceback (most recent call last):

File "<ipython-input-81-a4a342a59c5a>", line 1, in <module>
attachment_file = rally.getAttachment(us, attachment_names[0])

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1700, in getAttachment
att.Content = base64.decodebytes(att_content.Content)  # maybe further txfm to Unicode ?

File "C:\Miniconda3\lib\base64.py", line 552, in decodebytes
_input_type_check(s)

File "C:\Miniconda3\lib\base64.py", line 520, in _input_type_check
raise TypeError(msg) from err

TypeError: expected bytes-like object, not str

如果我尝试使用，我会收到类似的错误

test_obj = rally.getAttachments(us)

返回如下错误:

Traceback (most recent call last):

File "<ipython-input-82-06a8cd525177>", line 1, in <module>
rally.getAttachments(us)

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1721, in getAttachments
attachments = [self.getAttachment(artifact, attachment_name) for attachment_name in attachment_names]

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1721, in <listcomp>
attachments = [self.getAttachment(artifact, attachment_name) for attachment_name in attachment_names]

File "C:\Miniconda3\lib\site-packages\pyral\restapi.py", line 1700, in getAttachment
att.Content = base64.decodebytes(att_content.Content)  # maybe further txfm to Unicode ?

File "C:\Miniconda3\lib\base64.py", line 552, in decodebytes
_input_type_check(s)

File "C:\Miniconda3\lib\base64.py", line 520, in _input_type_check
raise TypeError(msg) from err

TypeError: expected bytes-like object, not str

看来我从根本上误解了此方法所需的参数？以前有没有人能够成功地做到这一点？对于它的值(value)，我可以毫无问题地将 addAttachment() 方法与与上述类似的工作流程一起使用。我试过使用 bytes() 方法将文件名(字符串)转换为 utf-8，但这没有帮助。

我也在 pyral 源代码中查看了这个示例，但是在尝试执行它时我收到了完全相同的错误。

https://github.com/klehman-rally/pyral/blob/master/examples/get_attachments.py

Answer 1

看起来像是 restapi.py 脚本中的问题 - base64 库中没有 decodebytes 方法:

att.Content = base64.decodebytes(att_content.Content)

所有可用方法的描述如下: RFC 3548: Base16, Base32, Base64 Data Encodings因此，解决方法是在 restapi.py 中用 base64.b64decode 替换 decodebytes。至少，它对我有用。

例如在 Mac OS X 上的位置:

/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyral/restapi.py