无法让 Firestore 快速入门在 Python 中工作
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【中文标题】无法让 Firestore 快速入门在 Python 中工作【英文标题】:Cannot get Firestore Quickstart to work in Python 【发布时间】:2019-04-07 20:33:28 【问题描述】:我在 Python 中关注了 quickstart guide 的 Firestore,但由于收到以下错误消息,我无法让它运行:
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "Name resolution failure"
debug_error_string = ""created":"@1554833859.769886000","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2267,"referenced_errors":["created":"@1554833859.769576000","description":"Name resolution failure","file":"src/core/ext/filters/client_channel/request_routing.cc","file_line":165,"grpc_status":14]"
...
google.api_core.exceptions.ServiceUnavailable: 503 Name resolution failure
这是我的代码:
db = firestore.Client()
doc_ref = db.collection(u'users').document(u'alovelace')
doc_ref.set(
u'first': u'Ada',
u'last': u'Lovelace',
u'born': 1815
)
# Then query for documents
users_ref = db.collection(u'users')
docs = users_ref.get()
for doc in docs:
print(u' => '.format(doc.id, doc.to_dict()))
-
数据在那里:
Mac 上的环境设置如下:
export GOOGLE_APPLICATION_CREDENTIALS=/path/to/credentials.json
用于认证
google-cloud-firestore
安装在新的 virtualenv 中,如快速入门指南中所述。
我确定我正在使用正确的gcloud
项目:
gcloud config set project example4
我一定缺少一些简单的东西。任何提示表示赞赏!
【问题讨论】:
我也为此开了一张支持票。见github.com/googleapis/google-cloud-python/issues/7679 【参考方案1】:由于我还没有得到答案,我不得不使用 Firestore REST API 作为替代方案并将其推送到我的GitHub Repo。
缺点是,它需要自定义 JWT 令牌生成。我是这样为我工作的:
import json
import time
import jwt
from jwt.contrib.algorithms.pycrypto import RSAAlgorithm
from definitions import AUTH_FILE_PATH
class JWT(object):
def get_token(self):
"""
Returns the jwt token using the configured `/auth.json` file and a default expiration of an hour.
"""
# The implementation has been guided by this page:
# https://developers.google.com/identity/protocols/OAuth2ServiceAccount
try:
jwt.register_algorithm('RS256', RSAAlgorithm(RSAAlgorithm.SHA256))
except ValueError:
# Algorithm already has a handler
pass
with open(AUTH_FILE_PATH, 'r') as f:
auth = json.load(f)
iat = time.time()
# exp is set to expire the token maximum of an hour later
# see https://developers.google.com/identity/protocols/OAuth2ServiceAccount#formingclaimset
exp = iat + 3600
payload = 'iss': auth['client_email'],
'sub': auth['client_email'],
# see https://github.com/googleapis/googleapis/blob/master/google/firestore/firestore_v1.yaml
# name: firestore.googleapis.com # Service name
# - name: google.firestore.v1.Firestore # API name
# 'aud': 'https://SERVICE_NAME/API_NAME'
'aud': 'https://firestore.googleapis.com/google.firestore.v1.Firestore',
'iat': iat,
'exp': exp
additional_headers = 'kid': auth['private_key_id']
# For jwt docs see: https://pyjwt.readthedocs.io/en/latest/
return jwt.encode(payload, auth['private_key'], headers=additional_headers, algorithm='RS256')
Thats 源文件。 然后可以这样使用:
jwt = JWT()
token = 'Bearer ' + jwt.get_token().decode("utf-8")
base_api_url = 'https://content-firestore.googleapis.com/v1'
project = 'example5-237118'
database = '/databases/(default)/'
endpoint_prefix = base_api_url + '/projects/' + project + database
# list collections
endpoint = 'documents:listCollectionIds'
print(requests.post(endpoint_prefix + endpoint, headers='Authorization': token).text)
See 源文件。
【讨论】:
【参考方案2】:我可以通过设置来解决问题
os.environ['GRPC_DNS_RESOLVER'] = 'native'
【讨论】:
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