从云函数访问谷歌云存储桶会引发 500 错误

Question

我正在尝试从云函数 (python) 实例访问谷歌云存储桶，它抛出了神秘的 500 错误。

• 我也赋予了服务帐户编辑角色。它没有做任何改变。
• 我还检查了是否有任何配额超出限制。限制甚至没有接近。

拜托，谁能帮我找出这个错误的原因？

这里是代码

    from google.cloud import storage
    import os
    import base64

    storage_client = storage.Client()


    def init_analysis(event, context):
        print("event", event)
        pubsub_message = base64.b64decode(event['data']).decode('utf-8')

        print(pubsub_message)
        bucket_name = 'my-bucket'
        bucket = storage_client.get_bucket(bucket_name)
        blobs = bucket.list_blobs()
        for blob in blobs:
            print(blob.name)

错误：

    Traceback (most recent call last): File "/env/local/lib/python3.7/site-packages/google/auth/compute_engine/credentials.py", line 99, in refresh service_account=self._service_account_email) File "/env/local/lib/python3.7/site-packages/google/auth/compute_engine/_metadata.py", line 208, in get_service_account_token 'instance/service-accounts/{0}/token'.format(service_account)) File "/env/local/lib/python3.7/site-packages/google/auth/compute_engine/_metadata.py", line 140, in get url, response.status, response.data), response) google.auth.exceptions.TransportError: ("Failed to retrieve http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token from the Google Compute Enginemetadata service. Status: 500 Response:\nb'Could not fetch URI /computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token\\n'", <google.auth.transport.requests._Response object at 0x2b0ef9edf438>) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/env/local/lib/python3.7/site-packages/google/cloud/functions/worker.py", line 383, in run_background_function _function_handler.invoke_user_function(event_object) File "/env/local/lib/python3.7/site-packages/google/cloud/functions/worker.py", line 217, in invoke_user_function return call_user_function(request_or_event) File "/env/local/lib/python3.7/site-packages/google/cloud/functions/worker.py", line 214, in call_user_function event_context.Context(**request_or_event.context)) File "/user_code/main.py", line 21, in init_analysis bucket = storage_client.get_bucket(bucket_name) File "/env/local/lib/python3.7/site-packages/google/cloud/storage/client.py", line 227, in get_bucket bucket.reload(client=self) File "/env/local/lib/python3.7/site-packages/google/cloud/storage/_helpers.py", line 130, in reload _target_object=self, File "/env/local/lib/python3.7/site-packages/google/cloud/_http.py", line 315, in api_request target_object=_target_object, File "/env/local/lib/python3.7/site-packages/google/cloud/_http.py", line 192, in _make_request return self._do_request(method, url, headers, data, target_object) File "/env/local/lib/python3.7/site-packages/google/cloud/_http.py", line 221, in _do_request return self.http.request(url=url, method=method, headers=headers, data=data) File "/env/local/lib/python3.7/site-packages/google/auth/transport/requests.py", line 205, in request self._auth_request, method, url, request_headers) File "/env/local/lib/python3.7/site-packages/google/auth/credentials.py", line 122, in before_request self.refresh(request) File "/env/local/lib/python3.7/site-packages/google/auth/compute_engine/credentials.py", line 102, in refresh six.raise_from(new_exc, caught_exc) File "<string>", line 3, in raise_from google.auth.exceptions.RefreshError: ("Failed to retrieve http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token from the Google Compute Enginemetadata service. Status: 500 Response:\nb'Could not fetch URI /computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token\\n'", <google.auth.transport.requests._Response object at 0x2b0ef9edf438>)
google.auth.exceptions.TransportError: ("Failed to retrieve http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token from the Google Compute Enginemetadata service. Status: 500 Response:\nb'Could not fetch URI /computeMetadata/v1/instance/service-accounts/my-project@appspot.gserviceaccount.com/token\\n'"

Answer 1

您收到的错误是因为您的 Cloud Functions 服务帐户没有 cloudfunctions.serviceAgent 角色。正如您在the documentation 上看到的：

如果您更改 Cloud Functions 服务帐户的权限，则从您的函数内部验证为运行时服务帐户可能会失败。

但是，我发现有时您无法添加此角色，因为它没有显示为选项。我已将此问题报告给 Google Cloud Functions 工程团队，他们正在努力解决。

不过，您可以使用this gcloud 命令再次添加角色：

gcloud projects add-iam-policy-binding <project_name> --role=roles/cloudfunctions.serviceAgent --member=serviceAccount:service-<project_number>@gcf-admin-robot.iam.gserviceaccount.com