Python Bookshelf 应用在使用 postgresql 云部署到 GCP 时出错 SQL 数据库

Question

我正在使用 postgresSQL 云 SQL 数据库部署 GCP Python Bookshelf 应用程序。我的应用程序运行不正确。错误日志如下图所示。

我已在 app.yaml、requirements.txt 和 config.py 文件中完成所有必需的更改。该项目运行在本地使用 cloud-sql-proxy 正常，但在部署版本中无法正常工作。有人可以指导我如何解决这个问题吗？

我在app.yaml中的环境变量是：

runtime: python
env: flex
entrypoint: gunicorn -b :$PORT main:app

runtime_config:
  python_version: 3

#[START cloudsql_settings]
beta_settings:
    cloud_sql_instances: "<my_project_id>:<region_name>:<cloudsql_instance>"
    # cloud_sql_instances: "your-cloudsql-connection-name"
#[END cloudsql_settings]

config.py是：

import os

DATA_BACKEND = 'cloudsql'
PROJECT_ID = '<my_project_id>'
CLOUDSQL_USER = '<username>'
CLOUDSQL_PASSWORD = '<password>'
CLOUDSQL_DATABASE = '<db_name>'
CLOUDSQL_CONNECTION_NAME = '<my_project_id>:<region_name>:<cloudsql_instance>'
LOCAL_SQLALCHEMY_DATABASE_URI = (
    'postgresql+psycopg2://{user}:{password}@127.0.0.1:3306/{database}').format(
        user=CLOUDSQL_USER, password=CLOUDSQL_PASSWORD,
        database=CLOUDSQL_DATABASE)
LIVE_SQLALCHEMY_DATABASE_URI = (
    'postgres://{user}:{password}@localhost/{database}'
    '?unix_socket=/cloudsql/{connection_name}').format(
        user=CLOUDSQL_USER, password=CLOUDSQL_PASSWORD,
        database=CLOUDSQL_DATABASE, connection_name=CLOUDSQL_CONNECTION_NAME)

if os.environ.get('GAE_INSTANCE'):
    SQLALCHEMY_DATABASE_URI = LIVE_SQLALCHEMY_DATABASE_URI
else:
    SQLALCHEMY_DATABASE_URI = LOCAL_SQLALCHEMY_DATABASE_URI

requirements.txt是：

Flask>=1.0.0
google-cloud-datastore==1.7.1
gunicorn==19.9.0
Flask-SQLAlchemy==2.3.2
psycopg2==2.8.4
PyMySQL==0.9.2
Flask-PyMongo>=2.0.0
oauth2client==4.1.2
PyMongo==3.7.2
six==1.11.0

详细错误是：

Traceback (most recent call last):
  File "/env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2275, in _wrap_pool_connect
    return fn()
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 363, in connect
    return _ConnectionFairy._checkout(self)
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 760, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 492, in checkout
    rec = pool._do_get()
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/impl.py", line 139, in _do_get
    self._dec_overflow()
  File "/env/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 68, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/env/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 153, in reraise
    raise value
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/impl.py", line 136, in _do_get
    return self._create_connection()
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 308, in _create_connection
    return _ConnectionRecord(self)
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 437, in __init__
    self.__connect(first_connect_check=True)
  File "/env/lib/python3.6/site-packages/sqlalchemy/pool/base.py", line 639, in __connect
    connection = pool._invoke_creator(self)
  File "/env/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 114, in connect
    return dialect.connect(*cargs, **cparams)
  File "/env/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 481, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/env/lib/python3.6/site-packages/psycopg2/__init__.py", line 125, in connect
    dsn = _ext.make_dsn(dsn, **kwargs)
  File "/env/lib/python3.6/site-packages/psycopg2/extensions.py", line 174, in make_dsn
    parse_dsn(dsn)
psycopg2.ProgrammingError: invalid dsn: invalid connection option "unix_socket"

Answer 1

您在使用 postgresql+psycopg2://username:password@/db?unix_socket=/cloudsql/project-name:region:dbinstance 吗？

尝试使用 postgres:// 而不是 postgresql+psycopg2//:

您向我们提供的信息越多，关于您的连接或任何其他信息，我们就越能尝试帮助您。这就是你所依据的 tutorial 吗？

编辑：

嘿，如果您仔细检查每个连接都正常，请将 Cloud SQL 客户端角色添加到您的应用引擎服务帐户，如果这为您解决了问题，请告诉我。

Answer 2

LIVE_SQLALCHEMY_DATABASE_URI = ( 'postgres://{user}:{password}@localhost/{database}' '?host=/cloudsql/{connection_name}')。

我不得不在 LIVE_SQLALCHEMY_DATABASE_URI 中 将 unix_socket 替换为主机 。也只需要 postgres。

我不知道是否需要，但我还向我的应用引擎服务帐户添加了云 SQL 客户端角色。感谢大家的帮助。

Answer 3

仅供参考，此语法适用于在 Cloud SQL 中使用 PostgreSQL 实例的 App Engine 部署，使用 pg8000 驱动程序：

connection_string = sqlalchemy.engine.url.URL(
   drivername="postgres+pg8000",
   username=username,
   password=password,
   database=database,
   query="unix_sock": "/cloudsql/{}/.s.PGSQL.5432".format(instance),
)

connection = sqlalchemy.create_engine(
    connection_string,
    pool_size=50,
    max_overflow=2,
    pool_timeout=30,
    pool_recycle=1800,
)

Python Bookshelf 应用在使用 postgresql 云部署到 GCP 时出错 SQL 数据库

Python Bookshelf App giving error on deployment to GCP using postgresql cloud SQL DB

python

postgresql

google-app-engine

psycopg2

google-cloud-sql