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A comment on Show HN: I wanted to measure CO2 in my office, so I build a C++ WebServer/App. Parent comment

Re:Show HN: I wanted to measure CO2 in my office, so I build... by stackmad on Friday January 25, 2019 @08:19AM (#18997636)
Though with your steps it at least starts, but the webserver fails, and CTRL+C doesn't work ^^

   * Serving Flask app "co2meter.server" (lazy loading)
   * Environment: production
     WARNING: Do not use the development server in a production environment.
     Use a production WSGI server instead.
   * Debug mode: off
  INFO:werkzeug: * Running on http://127.0.0.1:1201/ (Press CTRL+C to quit)
  ERROR:flask.app:Exception on / [GET]
  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 2292, in wsgi_app
      response = self.full_dispatch_request()
    File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
      rv = self.handle_user_exception(e)
    File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1718, in handle_user_exception
      reraise(exc_type, exc_value, tb)
    File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
      rv = self.dispatch_request()
    File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request
      return self.view_functions[rule.endpoint](**req.view_args)
    File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 64, in home
      data = read_logs()
    File "/usr/local/lib/python2.7/site-packages/co2meter/server.py", line 236, in read_logs
      with open(os.path.join('logs', name + '.csv'), 'r') as f:
  IOError: [Errno 2] No such file or directory: 'logs/co2.csv'
  INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET / HTTP/1.1" 500 -
  INFO:werkzeug:127.0.0.1 - - [25/Jan/2019 14:18:23] "GET /favicon.ico HTTP/1.1" 404 -
  ^C^C^C^C
  ^C^C
[ Parent | on HN ]
Re:Show HN: I wanted to measure CO2 in my office, so I build... by andor on Sunday January 27, 2019 @05:38AM (#19011214)
co2meter_server writes measurements to "logs/co2.csv" in the current working directory every 30 seconds or so. As long as there is no measurement, you'll get this error from the web app trying to access the file. Just wait a minute and refresh the page.
[ Parent | on HN ]