About Using App Engine to start a Compute Engine VM problem

[育峰吳]

Hi,
I want to build an app engine task runing using corn service to start and stop the VM instance.
I find some example file on github :https://github.com/fivunlm/app-engine-start-vm.
And I modify the code to test, I use google cloud shell to deploy the app engine application("gcloud app depoly app.yaml" to deploy )
but I got the "Internal Server Error" , when I go to https://projectname.appspot.com/vm/start.
Then,I try to test then add the code in main.py file
'''
@app.route('/vm')
def vm():
    credentials = AppAssertionCredentials(scope='https://www.googleapis.com/auth/compute')
    result = credentials
    return json.dumps(result, indent=4)
'''
The I got the same result "Internal Server Error".
Does anyone have an idea about this problem?

[育峰吳]

I get the answer.
The  API about discover got the error ,because the result is too large to memcache.
 ValueError: Values may not be more than 1000000 bytes in length; received 1014315 bytes.

So  I modify the code in main.py file
'''
@app.route('/vm/start')
def start_vm():

    credentials = AppAssertionCredentials(scope='https://www.googleapis.com/auth/compute')

    http = credentials.authorize(httplib2.Http(memcache))
    api_start_uri = 'https://www.googleapis.com/compute/v1/projects/{project}/zones/{zone}/instances/{instance}/start'
    api_start_uri = api_start_uri.format(project=PROJECT, zone=INSTANCE_ZONE, instance=INSTANCE_NAME)
    response, result = http.request(
        uri=api_start_uri,
        method='POST'
        )
return result, 200, {'Content-Type': 'application/json'}

''''

[George (Cloud Platform Support)]

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