Question

当尝试使用Task("Build") .DoesForEach( GetFiles ("**/*.sln" ), (sln) => DirectoryPath buildDir = MakeAbsolute(Directory("./bin/build")); // Use MSBuild var settings = new MSBuildSettings() .WithProperty("OutputPath", buildDir.FullPath); MSBuild(sln, settings); });

进行HTTPS POST时，我不断收到以下异常

此问题偶尔发生，并且重试（使用requests模块）时，同一请求成功通过。我不知道如何重现此问题，但运行大量HTTPS POST请求时可以看到此问题。

backoff

相关代码：

Traceback (most recent call last):
 File \"/usr/local/lib/python2.7/dist-packages/shared/util/http_util.py\", line 71, in send_https_post_request
 response = session.post(url, cert=cert, data=data)
 File \"/usr/local/lib/python2.7/dist-packages/requests/sessions.py\", line 522, in post
 return self.request('POST', url, data=data, json=json, **kwargs)
 File \"/usr/local/lib/python2.7/dist-packages/requests/sessions.py\", line 475, in request
 resp = self.send(prep, **send_kwargs)
 File \"/usr/local/lib/python2.7/dist-packages/requests/sessions.py\", line 596, in send
 r = adapter.send(request, **kwargs)
 File \"/usr/local/lib/python2.7/dist-packages/requests/adapters.py\", line 423, in send
 timeout=timeout
 File \"/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/connectionpool.py\", line 595, in urlopen
 chunked=chunked)
 File \"/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/connectionpool.py\", line 352, in _make_request
 self._validate_conn(conn)
 File \"/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/connectionpool.py\", line 831, in _validate_conn
 conn.connect()
 File \"/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/connection.py\", line 289, in connect
 ssl_version=resolved_ssl_version)
 File \"/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py\", line 306, in ssl_wrap_socket
 context.load_cert_chain(certfile, keyfile)
IOError: [Errno 2] No such file or directory

能否请您帮助我进一步了解此问题？

Answer 1

... context.load_cert_chain(certfile, keyfile)
IOError: [Errno 2] No such file or directory

上下文显然是在加载证书和密钥

with pem_bytes_as_cert_file(pem_cert_in_bytes) as cert:
    response = session.post(url, cert=cert, data=data)

您似乎将证书和密钥作为字符串，并尝试创建一个临时文件以将其作为cert自变量

with tempfile.NamedTemporaryFile(delete=True, suffix='.pem') as t_pem:
    f_pem = open(t_pem.name, 'wb')
    f_pem.write(pem_cert_bytes)
    f_pem.close()
    yield t_pem.name

您使用tempfile.NamedTemporaryFile创建一个临时文件，并将cert + key字符串写入其中。然后关闭临时文件。 documentation for NamedTemporaryFile指出：

如果delete为true（默认设置），则该文件将在关闭后立即删除。

因此，关闭文件后，该文件即被删除。仅当您幸运时（种族条件），当您尝试从session.post内部使用该文件时，该文件仍可在系统中访问。

使用Python'requests'库的HTTPS POST请求上出现不一致的IOError异常

1 个答案: