Google Cloud Functions 上没有名为 psycopg2._psycopg2 的模块

Question

I have a Google Cloud Function that uses Google Cloud SQL through psycopg2. I have psycopg2 in my requirements.txt but once the service updates I get the error No module named psycopg2._psycopg2 .

Is this a problem with psycopg2's C libraries running in the Cloud Function's environment ? How do I fix this?

main.py

import psycopg2

def postgres_demo(request):
    return "hi"

requirements.txt

psycopg2==2.8.2

serverless.yml

service: gcf-python-v2

provider:
    name: google
    stage: dev
    runtime: python37
    region: us-central1
    project: my-project
    credentials: ~/.gcloud/keyfile.json

plugins:
    - serverless-google-cloudfunctions
    - serverless-python-requirements

custom:
    pythonRequirements:
        pythonBin: python3

package:
    exclude:
        - node_modules/**
        - .gitignore
        - .git/**

functions:
    second:
        handler: postgres_demo
        events:
            - http: path

Running serverless deploy always results in:

Deployment failed: RESOURCE_ERROR

 {"ResourceType":"cloudfunctions.v1beta2.function","ResourceErrorCode":"400","ResourceErrorMessage":"Function failed on loading user code. Error message: Code in file main.py can't be loaded.\nDid you list all required modules in requirements.txt?\nDetailed stack trace: Traceback (most recent call last):\n  File \"/env/local/lib/python3.7/site-packages/google/cloud/functions/worker.py\", line 305, in check_or_load_user_function\n    _function_handler.load_user_function()\n  File \"/env/local/lib/python3.7/site-packages/google/cloud/functions/worker.py\", line 184, in load_user_function\n    spec.loader.exec_module(main)\n  File \"<frozen importlib._bootstrap_external>\", line 728, in exec_module\n  File \"<frozen importlib._bootstrap>\", line 219, in _call_with_frames_removed\n  File \"/user_code/main.py\", line 1, in <module>\n    import psycopg2\n  File \"/user_code/psycopg2/__init__.py\", line 50, in <module>\n    from psycopg2._psycopg import (                     # noqa\nModuleNotFoundError: No module named 'psycopg2._psycopg'\n"}

Answer 1

I solved it by removing python-serverless-requirements altogether and using the serverless package option to make sure only main.py and requirements.txt were included in the zip file.

Google cloud installs the packages in requirements.txt itself so you don't need a serverless plugin. Google cloud also has the necessary C libraries for psycopg2.