我正在尝试在Google App Engine上使用py2neo设置后端。当在应用程序引擎上的开发人员上推送时，它工作得很好，但是，不幸的是，当我在本地主机上使用它时，它不起作用。
首先，我已经在python中设置了HOME环境变量（由于这个技巧，我的代码可以在我的dev上运行），但是它不能解决localhost问题。
然后，我遵循了该建议"ImportError: No module named _ssl" with dev_appserver.py from Google App Engine
它可以防止一个异常，但另一个异常会在之后出现。
这是我的回溯
ft1.1: Traceback (most recent call last):
File "/Users/Arnaud/Documents/project/app/test/neo4j/test_graph_handler.py", line 13, in test_get_direct_neighbours
selection = self.graph_handler.get_direct_neighbours("8")
File "/Users/Arnaud/Documents/project/app/neo4j/graph_handler.py", line 20, in get_direct_neighbours
labels(l) AS `relationship`" % self.protect(ean))
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 694, in run
return self.begin(autocommit=True).run(statement, parameters, **kwparameters)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 370, in begin
return self.transaction_class(self, autocommit)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 1212, in __init__
self.session = driver.session()
File "/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/session.py", line 126, in session
connection = connect(self.address, self.ssl_context, **self.config)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/bolt.py", line 444, in connect
if not store.match_or_trust(host, der_encoded_server_certificate):
File "/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/bolt.py", line 397, in match_or_trust
f_out = os_open(self.path, O_CREAT | O_APPEND | O_WRONLY, 0o600) # TODO: Windows
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/devappserver2/python/stubs.py", line 73, in fake_open
raise OSError(errno.EROFS, 'Read-only file system', filename)
OSError: [Errno 30] Read-only file system: '/Users/Arnaud/.neo4j/known_hosts'
由于一切都在沙盒环境中进行，并且有假用户，异常是正常的，但在开发人员中不会发生。
这是/Users/Arnaud/Documents/project/app/neo4j/graph_handler.py:20
13 def get_direct_neighbours(self, ean):
14 selection = self.graph.run("\
15 MATCH\
16 (:Product {ean: '%s'})-->(l)<--(n:Product)\
17 RETURN\
18 n.ean AS `ean`,\
19 n.name AS `name`,\
20 labels(l) AS `relationship`" % self.protect(ean))
21 return selection
因此，为了理解为什么它对开发人员有效，我尝试定位沙箱和开发人员执行开始不同的地方。就在这里
/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/bolt.py:427
427 if ssl_context and SSL_AVAILABLE:
428 host, port = host_port
429 if __debug__: log_info("~~ [SECURE] %s", host)
430 try:
431 s = ssl_context.wrap_socket(s, server_hostname=host if HAS_SNI else None)
432 except SSLError as cause:
433 error = ProtocolError("Cannot establish secure connection; %s" % cause.args[1])
434 error.__cause__ = cause
435 raise error
436 else:
437 # Check that the server provides a certificate
438 der_encoded_server_certificate = s.getpeercert(binary_form=True)
439 if der_encoded_server_certificate is None:
440 raise ProtocolError("When using a secure socket, the server should always provide a certificate")
441 trust = config.get("trust", TRUST_DEFAULT)
442 if trust == TRUST_ON_FIRST_USE:
443 store = PersonalCertificateStore()
444 if not store.match_or_trust(host, der_encoded_server_certificate):
445 raise ProtocolError("Server certificate does not match known certificate for %r; check "
446 "details in file %r" % (host, KNOWN_HOSTS))
447 else:
448 der_encoded_server_certificate = None
因为在开发人员中，在本地主机上时，ssl_compat.py中的ssl加载失败，因此成功，因此代码进入if语句中，并在444行失败
要了解我强迫SSL_AVAILABLE为虚假，但是即使如此，我也遇到了一些关于App Engine套接字的问题，这些问题无法识别为套接字
ft1.1: Traceback (most recent call last):
File "/Users/Arnaud/Documents/project/app/test/neo4j/test_graph_handler.py", line 13, in test_get_direct_neighbours
selection = self.graph_handler.get_direct_neighbours("8")
File "/Users/Arnaud/Documents/project/app/neo4j/graph_handler.py", line 20, in get_direct_neighbours
labels(l) AS `relationship`" % self.protect(ean))
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 694, in run
return self.begin(autocommit=True).run(statement, parameters, **kwparameters)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 370, in begin
return self.transaction_class(self, autocommit)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/database/__init__.py", line 1212, in __init__
self.session = driver.session()
File "/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/session.py", line 126, in session
connection = connect(self.address, self.ssl_context, **self.config)
File "/Users/Arnaud/Documents/project/app/libs/py2neo/packages/neo4j/v1/bolt.py", line 460, in connect
ready_to_read, _, _ = select((s,), (), (), 0)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 483, in select
_SetState(request, _GetSocket(value), POLLIN)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 425, in _GetSocket
raise ValueError('select only supported on socket objects.')
ValueError: select only supported on socket objects.
如果有人遇到过同样的问题，那么我将对此感兴趣，因为在进行任何测试之前必须先推动开发人员。
编辑：
对于那些想知道的人，因为我还没有收到奈杰尔的答复，而且我需要一些快速的解决方案，所以我创建了自己的类来发送和接收密码请求，它与应用程序引擎兼容，并且将其放在了要点：https://gist.github.com/ArnaudParan/e26f291ba8b3c08e5b762d549667c7d6这是实验性的，如果您要求完整的节点，则可能不起作用，但如果有帮助，我会发布
最佳答案
第一个回溯可能表明py2neo软件包可能与GAE's sandbox restrictions不兼容。特别是，它显示了尝试以写入模式（/Users/Arnaud/.neo4j/known_hosts）打开os_open(self.path, O_CREAT | O_APPEND | O_WRONLY, 0o600)文件的尝试，这是不允许的。检查是否可以将py2neo配置为不这样做。
沙箱对套接字也有限制，请参见Limitations and restrictions。
关于python - 将py2neo v3与Google App Engine一起使用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38830407/