Question

我正在尝试仅使用Openstack Python SDK从一瞥下载OpenStack图像，但我只收到此错误：

Traceback (most recent call last):
  File "/home/openstack/discovery/discovery.py", line 222, in <module>
    main(sys.argv[1:])
  File "/home/openstack/discovery/discovery.py", line 117, in main
    image_service.download_image(image)
  File "/usr/local/lib/python2.7/dist-packages/openstack/image/v2/_proxy.py", line 72, in download_image
    return image.download(self.session)
  File "/usr/local/lib/python2.7/dist-packages/openstack/image/v2/image.py", line 166, in download
    checksum = resp.headers["Content-MD5"]
  File "/usr/local/lib/python2.7/dist-packages/requests/structures.py", line 54, in __getitem__
    return self._store[key.lower()][1]
KeyError: 'content-md5'

奇怪的是，如果我使用IDE（带有远程调试的PyCharm）或脚本（python script.py -i ...）运行代码，我会收到错误，但如果我使用a运行每一行python解释器（ipython / python）错误不会发生！不知道为什么。

以下是我正在使用的代码：

...
image_name = node.name + "_" + time.strftime("%Y-%m-%d_%H-%M-%S")
print "Getting data from", node.name
compute_service.create_server_image(node, image_name)
image = image_service.find_image(image_name)
image_service.wait_for_status(image, 'active')
fileName = "%s.img" % image.name

with open(str(fileName), 'w+') as imgFile:
    imgFile.write(image.download(conn.image.session))
...

此代码最终使用此方法调用此文件/usr/local/lib/python2.7/dist-packages/openstack/image/v2/image.py中的API：

def download(self, session):
    """Download the data contained in an image"""
    # TODO(briancurtin): This method should probably offload the get
    # operation into another thread or something of that nature.
    url = utils.urljoin(self.base_path, self.id, 'file')
    resp = session.get(url, endpoint_filter=self.service)

    checksum = resp.headers["Content-MD5"]
    digest = hashlib.md5(resp.content).hexdigest()
    if digest != checksum:
        raise exceptions.InvalidResponse("checksum mismatch")

    return resp.content

resp.headers变量没有键“Content-MD5”。这是我找到的价值：

{'Date': 'Thu, 01 Sep 2016 20:17:01 GMT', 'Transfer-Encoding': 'chunked', 
 'Connection': 'keep-alive', 'Content-Type': 'application/octet-stream', 
 'X-Openstack-Request-Id': 'req-9eb16897-1398-4ab2-9cd4-45706e92819c'}

但是根据REST API文档，响应应该返回密钥Content-MD5： http://developer.openstack.org/api-ref/image/v2/?expanded=download-binary-image-data-detail

如果我只是评论MD5检查下载工作正常，但这是在SDK内部，所以我不能/不应该更改它。有人建议如何使用OpenStack Python SDK实现这一目标吗？这是一个SDK错误吗？

Answer 1

原来这确实是一个错误的SDK / Glance。有关它的更多细节可以在这里找到： https://bugs.launchpad.net/python-openstacksdk/+bug/1619675

可以在此处看到实施的修复： https://github.com/openstack/python-openstacksdk/commit/759651f4a9eae2ba546f46613550a4cb10ddd964

Openstack Python SDK - Glance不返回图像MD5

1 个答案: