Google Cloud Datastore 模拟器不使用默认凭据

Question

根据 Google's Cloud Datastore Emulator installation instructions，我能够在 bash 终端 window 中安装和运行模拟器，没有问题gcloud beta emulators datastore start --project gramm-id.

我还在另一个终端 $(gcloud beta emulators datastore env-init) 中设置了环境变量 per the instructions 并验证了它们是否已定义。

但是，当我运行我的 python 脚本使用以下代码将实体添加到本地数据存储时：

from google.cloud import datastore

print(os.environ['DATASTORE_HOST'])          # output: http://localhost:8081
print(os.environ['DATASTORE_EMULATOR_HOST']) # output: localhost:8081


client = datastore.Client('gramm-id')
kind = 'Task'
name = 'simpleTask'

task_key = client.key(kind, name)
task = client.Enity(key=task_key)
task['description'] = 'Buy milk'
client.put(task)

我收到错误：

Traceback (most recent call last):
  File "tools.py", line 237, in <module>
    client = datastore.Client('gramm-id')
  File "/home/.../lib/python3.6/site-packages/google/cloud/datastore/client.py", line 205, in __init__
    project=project, credentials=credentials, _http=_http)
... long stack trace ....
  File "/home/.../lib/python3.6/site-packages/google/auth/_default.py", line 306, in default
    raise exceptions.DefaultCredentialsError(_HELP_MESSAGE)
google.auth.exceptions.DefaultCredentialsError: Could not automatically determine credentials. Please set GOOGLE_APPLICATION_CREDENTIALS or explicitly create credentials and re-run the application. For more information, please see https://developers.google.com/accounts/docs/application-default-credentials.

我认为我不需要 create a GCP service account and provide access credentials 在我的机器上使用数据存储模拟器。

我的系统：

Ubuntu 18.04
蟒蛇python3.6.6
Google 云 SDK 215.0.0
云数据存储模拟器 2.0.2.

我错过了什么？

Answer 1

gcloud auth application-default login

这将提示您通过浏览器登录 window 并会为您正确设置 GOOGLE_APPLICATION_CREDENTIALS。 [1]

Answer 2

理论上您应该能够使用模拟凭证，例如：

class EmulatorCreds(google.auth.credentials.Credentials):

    def __init__(self):
        self.token = b'secret'
        self.expiry = None

    @property
    def valid(self):
        return True

    def refresh(self, _):
        raise RuntimeError('Should never be refreshed.')

client = datastore.Client(
    project='gramm-id',
    credentials=EmulatorCreds() , 
    _http=requests.Session()  # Un-authorized
)

但是 it seems like this doesn't currently work，所以现在您需要设置 GOOGLE_APPLICATION_CREDENTIALS

Google Cloud Datastore 模拟器不使用默认凭据

Google Cloud Datastore Emulator does not use default credentials

python

google-cloud-datastore

google-cloud-platform