Openstack Python SDK - Glance 没有 return 图像 MD5

Question

我尝试仅使用 Openstack Python SDK 从 glance 下载 OpenStack 映像，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，如果我运行使用 IDE（PyCharm 远程调试）或作为脚本（python script.py -i ...) 我得到了错误，但是如果我运行每行使用 python 解释器 (ipython/python)，错误就不会发生！不知道为什么。

这是我使用的代码：

...
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"。这是我为它找到的值：

{'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 return 使用密钥 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 中所以我不能't/shouldn改变它。有人对如何使用 OpenStack Python SDK 实现这一点有任何建议吗？这是一个 SDK 错误吗？

Answer 1

事实证明这确实是一个错误 SDK/Glance。有关它的更多详细信息，请参见此处： https://bugs.launchpad.net/python-openstacksdk/+bug/1619675

可以在此处查看已实施的修复： https://github.com/openstack/python-openstacksdk/commit/759651f4a9eae2ba546f46613550a4cb10ddd964

Openstack Python SDK - Glance 没有 return 图像 MD5

Openstack Python SDK - Glance does not return image MD5

python

openstack

openstack-glance

openstack-api