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GCP CloudFunctionsからCloudAPIを呼び出す方法

Last updated at Posted at 2020-04-02

PythonのSDKでライブラリ化されてない関数をCloudFunctionsから呼び出したかったが、gcloudコマンドはCloudFunctionsに入ってないので(CloudFunctionsが動くコンピュートノードにgcloudはインストールされていない)CloudAPIを直接呼ぶ必要があった

CloudFunctionsからCloudAPIをRESTで呼びたい場合以下の様に認証をして呼び出すことが出来る

def hello_world(request):
    import google.auth
    from google.auth.transport import requests

    # Get the credentials and project ID from the environment.
    credentials, project = google.auth.default(
        scopes=['https://www.googleapis.com/auth/cloud-platform'])

    # Create a requests Session object with the credentials.
    session = requests.AuthorizedSession(credentials)

    # Make an authenticated API request
    response = session.get(
        'https://www.googleapis.com/storage/v1/b'.format(project),
        params={'project': project})
    response.raise_for_status()

    return response.text

API単体のテストだと、テストフォームが用意されているので、こちらが便利
https://cloud.google.com/storage/docs/json_api/v1/buckets/list

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