'EntryPoint'对象在使用Google Compute Engine时没有属性“resolve”

问题描述

我有一个与Python中的加密包有关的问题。如果可能，你能帮助解决这些问题吗？ （尝试了很多，但couldnt找出确切的解决方案）

启动此错误的python代码：

  print（Salt：％s％salt）
 server_key = pyelliptic.ECC（curve =prime256v1）＃-----> Line2 
 print（Server_key：％s％server_key）＃----->> Line3 
 server_key_id = base64.urlsafe_b64encode（server_key.get_pubkey（）[1：]）
 
 http_ece.keys [server_key_id] = server_key 
 http_ece.labels [server_key_id] =P -256
 encrypted = http_ece.encrypt（data，salt = salt，keyid = server_key_id，
 dh = self.receiver_key，authSecret = self.auth_key）＃----->> Line8 
  

Salt的值在100％的情况下显示。

如果 Line3 成功执行，我会看到以下EntryPoint错误，因为调用http_ece.encrypt（）：

  AttributeError（'EntryPoint'对象没有属性'resolve'，）
  

（参考文件链接：） / p>



Requirements.txt（部分）：

  cryptography == 1.5 
 pyelliptic == 1.5.7 
 pyOpenSSL == 16.1.0 
  

运行时命令： sudo pip freeze --all | grep setuptools ，我得到：
setuptools == 27.1.2



这个问题似乎基本上是因为到安装在VM上的一些旧/不兼容的包（与PyElliptic，Cryptography，PyOpenSSL和/或setuptools相关）。供参考：

有人可以建议一个好的解决方案来完全解决这个问题吗？

谢谢，

解决方案

从项目路径/ opt / projects / myproject-google / myproject中移除以下命令，并解决了属性EntryPoint错误问题：

（假设项目虚拟环境路径为：/ opt / projects / myproject-google / venv）

命令： myproject-google / myproject）

  export PYTHONPATH =＃[Blank] 
 sudo pip install --upgrade virtualenv setuptools 
 sudo rm -rf ../venv 
 sudo virtualenv ../venv 
 source ../venv/bin/activate 
 sudo pip install --upgrade -r requirements.txt 
 deactivate 
  

运行上述命令升级了虚拟环境&虚拟环境中的setuptools版本。位于路径：/opt/projects/myproject-google/venv/lib/python2.7/site-packages。要测试setuptools是否已成功升级，请尝试以下某些命令：

1. 命令： sudo virtualenv --version
   输出： 15.0.3


2. 命令： echo $ PYTHONPATH
   输出：[blank]


3. 命令： python -c'import pkg_resources; print（pkg_resources .__ file __）'
   输出：〜/ .local / lib / python2.7 / site-packages / pkg_resources / __init __。pyc


4. 命令： python -c'import sys; print（sys.path）'
   输出： [''，'/usr/lib/python2.7' usr / lib / python2.7 / plat-x86_64-linux-gnu'，'/usr/lib/python2.7/lib-tk'，'/usr/lib/python2.7/lib-old'，'/ usr /lib/python2.7/lib-dynload'，'〜/ .local / lib / python2.7 / site-packages'，'/usr/local/lib/python2.7/dist-packages'，'/ opt / projects / myproject-google / myproject'，'/usr/local/lib/python2.7/dist-packages'，'/usr/lib/python2.7/dist-packages'，'/usr/lib/python2.7 / dist-packages / PILcompat']


5. 命令： ls / opt / projects / myproject-google /venv/lib/python2.7/site-packages
   输出：
   easy_install.py pip pkg_resources setuptools-27.2 .0.dist-info wheel-0.30.0a0.dist-info
easy_install.pyc pip-8.1.2.dist-info setuptools wheel


6. Command ： python -c'from cryptography.hazmat.backends import default_backend; print（default_backend（））'
   输出：< cryptography.hazmat.backends.multibackend.MultiBackend object at 0x7ff83a838d50& code>


7. 命令 / opt / projects / myproject- google / venv / bin / python -c' hazmat.backends import default_backend; print（default_backend（））'
   输出
   
回溯$ b< module>中的文件< string>，第1行
ImportError：没有模块命名cryptography.hazmat.backends



8. 命令： / opt / projects / myproject-google / venv / bin / python -cimport pkg_resources; print（pkg_resources .__ file __）
   输出： /opt/projects/myproject-google/venv/local/lib/python2.7/site-packages/pkg_resources / __ init __。pyc

参考链接：

这些步骤完全使用加密软件包&

更新。截至2016年9月15日，Cryptography团队再次添加了支持旧包的解决方法。
（参考链接：）

I have an issue related to Cryptography package in Python. Can you please help in resolving these, if possible ? (tried a lot, but couldnt figure out the exact solution)

The python code which initiates this error:

print("Salt: %s" % salt)
server_key = pyelliptic.ECC(curve="prime256v1")  # ----->> Line2
print("Server_key: %s" % server_key)   # ----->> Line3
server_key_id = base64.urlsafe_b64encode(server_key.get_pubkey()[1:])

http_ece.keys[server_key_id] = server_key
http_ece.labels[server_key_id] = "P-256"
encrypted = http_ece.encrypt(data, salt=salt, keyid=server_key_id,
            dh=self.receiver_key, authSecret=self.auth_key)  # ----->> Line8

Value of "Salt" is getting displayed in 100% of the cases.

If Line3 gets executed successfully, I see the the following EntryPoint Error because of http_ece.encrypt() call (Line8):

AttributeError("'EntryPoint' object has no attribute 'resolve'",)

(Ref. File Link: https://github.com/martinthomson/encrypted-content-encoding/blob/master/python/http_ece/init.py#L128 )

Requirements.txt(partial):

cryptography==1.5
pyelliptic==1.5.7
pyOpenSSL==16.1.0

On Running the command: sudo pip freeze --all |grep setuptools, I get:setuptools==27.1.2

Please let me know if any more detail is required.

This problem seems to be basically due to some Old/Incompatible packages(related to PyElliptic, Cryptography, PyOpenSSL and/or setuptools) installed on the VM. For Reference: https://github.com/pyca/cryptography/issues/3149

Can someone please suggest a good solution to resolve this issue completely ?

Thanks,

解决方案

Ran Following Commands from the project path /opt/projects/myproject-google/myproject and it resolved the Attribute EntryPoint Error Issue:

(Assuming project virtual env path as: /opt/projects/myproject-google/venv)

Command: (from path: /opt/projects/myproject-google/myproject)

export PYTHONPATH=      # [Blank]
sudo pip install --upgrade virtualenv setuptools
sudo rm -rf ../venv
sudo virtualenv ../venv
source ../venv/bin/activate
sudo pip install --upgrade -r requirements.txt
deactivate

Running the above commands upgraded the virtual environment & the setuptools version inside the virtual Env. located at path: /opt/projects/myproject-google/venv/lib/python2.7/site-packages. To test if setuptools have upgraded successfully, try some of these commands:

1. Command: sudo virtualenv --versionOutput: 15.0.3
2. Command: echo $PYTHONPATHOutput: [blank]
3. Command: python -c 'import pkg_resources; print(pkg_resources.__file__)'Output: ~/.local/lib/python2.7/site-packages/pkg_resources/__init__.pyc
4. Command: python -c 'import sys; print(sys.path)'Output: ['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '~/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/dist-packages', '/opt/projects/myproject-google/myproject', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat']
5. Command: ls /opt/projects/myproject-google/venv/lib/python2.7/site-packagesOutput:easy_install.py pip pkg_resources setuptools-27.2.0.dist-info wheel-0.30.0a0.dist-infoeasy_install.pyc pip-8.1.2.dist-info setuptools wheel
6. Command: python -c 'from cryptography.hazmat.backends import default_backend; print(default_backend())'Output: <cryptography.hazmat.backends.multibackend.MultiBackend object at 0x7ff83a838d50>
7. Command /opt/projects/myproject-google/venv/bin/python -c 'from cryptography.hazmat.backends import default_backend; print(default_backend())'OutputTraceback (most recent call last):File "<string>", line 1, in <module>ImportError: No module named cryptography.hazmat.backends
8. Command: /opt/projects/myproject-google/venv/bin/python -c "import pkg_resources; print(pkg_resources.__file__)"Output: /opt/projects/myproject-google/venv/local/lib/python2.7/site-packages/pkg_resources/__init__.pyc

Ref Link: https://github.com/pyca/cryptography/issues/3149

These Steps resolved the Attribute EntryPoint Issue completely with an updated version of cryptography package & the setuptools.

Update As on 15 September 2016, The Cryptography Team has again added the workaround for supporting old packages too.(Ref. Link: https://github.com/pyca/cryptography/issues/3150 )

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