Running flask on AWS SAM

[sohcahtoa82 at gmail.com]

On Thursday, October 12, 2017 at 9:20:11 PM UTC-7, Frustrated learner wrote:
> Hello,
> 
> I have a flask based application which i am able to run locally.
> 
> $ python swagger_server/app.py 
>  * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
> 
> I am trying to port this over to aws. I have all the dependencies and code organized in the same folder.
> 
> Here is the transaction and error:
> $ SERVER_NAME=0.0.0.0:3000 sam local start-api 
> 2017/10/12 21:02:20 Connected to Docker 1.32
> 2017/10/12 21:02:20 Fetching lambci/lambda:python3.6 image for python3.6 runtime...
> python3.6: Pulling from lambci/lambda
> Digest: sha256:c77ea3986c471c2f93dfa2a86492e6306989505073795da3b22defa2b10846a6
> Status: Image is up to date for lambci/lambda:python3.6
> 
> Mounting swagger_server.app.app (python3.6) at http://127.0.0.1:3000/current [GET]
> Mounting static files from public at /
> 
> You can now browse to the above endpoints to invoke your functions.
> You do not need to restart/reload SAM CLI while working on your functions,
> changes will be reflected instantly/automatically. You only need to restart
> SAM CLI if you update your AWS SAM template.
> 
> 2017/10/12 21:02:30 Invoking swagger_server.app.app (python3.6)
> 2017/10/12 21:02:30 Decompressing /Users/shekartippur/playground/cyclopscloud/cyclopsglobal/swagger_server.zip
> START RequestId: 9518afce-6cf7-4f20-9a31-0a60907b5467 Version: $LATEST
> 'SERVER_NAME': KeyError
> Traceback (most recent call last):
>   File "/var/task/connexion/apps/abstract.py", line 266, in __call__
>     return self.app(environ, start_response)
>   File "/var/task/flask/app.py", line 1997, in __call__
>     return self.wsgi_app(environ, start_response)
>   File "/var/task/flask/app.py", line 1977, in wsgi_app
>     ctx = self.request_context(environ)
>   File "/var/task/flask/app.py", line 1938, in request_context
>     return RequestContext(self, environ)
>   File "/var/task/flask/ctx.py", line 242, in __init__
>     self.url_adapter = app.create_url_adapter(self.request)
>   File "/var/task/flask/app.py", line 1765, in create_url_adapter
>     server_name=self.config['SERVER_NAME'])
>   File "/var/task/werkzeug/routing.py", line 1299, in bind_to_environ
>     wsgi_server_name = environ['SERVER_NAME']
> KeyError: 'SERVER_NAME'
> 
> END RequestId: 9518afce-6cf7-4f20-9a31-0a60907b5467
> REPORT RequestId: 9518afce-6cf7-4f20-9a31-0a60907b5467 Duration: 3257 ms Billed Duration: 3300 ms Memory Size: 0 MB Max Memory Used: 38 MB
> 
> I looked up the error and dint find much help. Wondering what I could be missing.

Instead of doing:

SERVER_NAME=0.0.0.0:3000 sam local start-api 

try this:

export SERVER_NAME="0.0.0.0:3000 sam local start-api"