我一直在尝试用Python编写和部署云功能。 (由于文档混乱且更改速度相对较快,因此放弃了node.js)
用于将消息发布到发布/订阅主题,当文件完成上传到Google云存储桶(“完成”)时触发。
我用来部署该功能的代码是
gcloud functions deploy hello_gcs_generic --runtime python37 --trigger-resource bucketcfpubsub
我一直在尝试使用this script provided by Google
import time
from google.cloud import pubsub_v1
project_id = "bucketcfpubsub"
topic_name = "projects/bucketcfpubsub/topics/pubsub"
publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_name)
def callback(message_future):
# When timeout is unspecified, the exception method waits indefinitely.
if message_future.exception(timeout=30):
print('Publishing message on {} threw an Exception {}.'.format(
topic_name, message_future.exception()))
else:
print(message_future.result())
for n in range(1, 10):
data = u'Message number {}'.format(n)
# Data must be a bytestring
data = data.encode('utf-8')
# When you publish a message, the client returns a Future.
message_future = publisher.publish(topic_path, data=data)
message_future.add_done_callback(callback)
print('Published message IDs:')
# We must keep the main thread from exiting to allow it to process
# messages in the background.
while True:
time.sleep(60)
我在Google Cloud Console中收到这些错误的原因
ERROR: (gcloud.functions.deploy) OperationError: code=3, message=Function load error: Code in file main.py can't be loaded.
Detailed stack trace: Traceback (most recent call last):
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 256, in check_or_load_user_function
_function_handler.load_user_function()
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 166, in load_user_function
spec.loader.exec_module(main)
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/user_code/main.py", line 3, in <module>
from google.cloud import pubsub_v1
ImportError: cannot import name 'pubsub_v1' from 'google.cloud' (unknown location)
按照these two帖子中的说明,我从helloworld代码示例中复制了requirements.txt,其中仅包含
google-cloud-error-reporting==0.30.0
并更新了其他云功能,例如bigquery,存储和日志记录。然后我得到了这些错误:
ERROR: (gcloud.functions.deploy) OperationError: code=3, message=Function load error: Code in file main.py can't be loaded.
Detailed stack trace: Traceback (most recent call last):
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 256, in check_or_load_user_function
_function_handler.load_user_function()
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 166, in load_user_function
spec.loader.exec_module(main)
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/user_code/main.py", line 3, in <module>
from google.cloud import pubsub_v1`
,我也找到了[此线程](ImportError: cannot import name 'pubsub_v1' from 'google.cloud' (unknown location),但我不太明白解决方案是什么,我尝试用google-cloud-pubsub == 0.38.0代替pubsub_v1,但没有帮助。我收到此错误:
Deploying function (may take a while - up to 2 minutes)...failed.
ERROR: (gcloud.functions.deploy) OperationError: code=3, message=Function load error: Code in file main.py can't be loaded.
Detailed stack trace: Traceback (most recent call last):
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 256, in check_or_load_user_function
_function_handler.load_user_function()
File "/env/local/lib/python3.7/site-packages/google/cloud/functions_v1beta2/worker.py", line 166, in load_user_function
spec.loader.exec_module(main)
File "<frozen importlib._bootstrap_external>", line 724, in exec_module
File "<frozen importlib._bootstrap_external>", line 860, in get_code
File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/user_code/main.py", line 3
此外,如果Google将pubsub更新到新版本后代码会中断,这似乎不是可持续的解决方案?
因此,我非常初学者,很迷失,但我希望本文档可以对您有所帮助。
更新:
似乎pubsub和pubsub_v1都可以使用,虽然不确定有什么区别。
@dustin我做了一个pip install -r requirements.txt,最终匹配了您提供的内容。 我还注意到在将函数部署为“ hello-gcs-generic”时出错,应将其更改为“ callback”。
python代码现在在本地运行良好,但是使用上述代码(OP中的第一行代码)将其部署到云中始终会返回此错误
ERROR: (gcloud.functions.deploy) OperationError: code=3, messa
ge=Function load error: Error: function load attempt timed out
.
答案 0 :(得分:0)
您需要将google-cloud-pubsub
添加到requirements.txt
文件中,而不是添加到main.py
文件中。它应该看起来像这样:
google-cloud-error-reporting==0.30.0
google-cloud-pubsub==0.38.0
答案 1 :(得分:0)
有一个simpler Python quickstart example可以满足您的需求。 ;-)
您引用的示例更高级。它显示了如何发布带有错误处理的消息。高级示例中的while(True): sleep(60)
行可以使主线程保持活动状态,除非发出Ctrl+C
或其等效命令以停止程序运行。之所以有此sleep
函数,是因为我们可以等待发布期货上的回调调用完成,而不必在发布调用后立即退出程序。再次,对于您要学习如何使用具有Cloud Functions的Cloud Pub / Sub而言,这可能有点太复杂了。我建议不要使用高级示例,而使用快速入门示例。
from google.cloud import pubsub_v1
# TODO project_id = "Your Google Cloud Project ID"
# TODO topic_name = "Your Pub/Sub topic name"
publisher = pubsub_v1.PublisherClient()
# The `topic_path` method creates a fully qualified identifier
# in the form `projects/{project_id}/topics/{topic_name}`
topic_path = publisher.topic_path(project_id, topic_name)
for n in range(1, 10):
data = u'Message number {}'.format(n)
# Data must be a bytestring
data = data.encode('utf-8')
# When you publish a message, the client returns a future.
future = publisher.publish(topic_path, data=data)
print('Published {} of message ID {}.'.format(data, future.result()))
print('Published messages.')