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last_query_time = 0
def GetFlightAwareJson(flight_number):
  """Scrapes the text json message from FlightAware for a given flight number.

  Given a flight number, loads the corresponding FlightAware webpage for that
  flight and extracts the relevant script that contains all the flight details
  from that page.  But only queries at most once per fixed period of time
  so as to avoid being blocked.

  Args:
    flight_number: text flight number (i.e.: SWA1234)

  Returns:
    Two tuple:
     - Text representation of the json message from FlightAware.
     - Text string of error message, if any
  """
  min_query_delay_seconds = 90
  url = 'https://flightaware.com/live/flight/' + flight_number

  # It seems there are a lot of queries on flight aware that come at
  # about the same time, so let's see if we can track when and why they
  # happen
  LogFlightAwareQuery(flight_number)

  global last_query_time
  seconds_since_last_query = time.time() - last_query_time
  if last_query_time and seconds_since_last_query < min_query_delay_seconds:
    error_msg = (
        'Unable to query FA for URL since last query to FA was only %d seconds '
        'ago; min of %d seconds needed: %s' % (
            seconds_since_last_query, min_query_delay_seconds, url))
    LogFlightAwareQuery(flight_number, error_msg)
    return '', error_msg

  last_query_time = time.time()

  try:
    response = requests.get(url, timeout=5)
  except requests.exceptions.RequestException as e:
    error_msg = 'Unable to query FA for URL due to %s: %s' % (e, url)
    LogFlightAwareQuery(flight_number, error_msg)
    return '', error_msg

  LogFlightAwareQuery(flight_number)




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last_query_time = 0
def GetFlightAwareJson(flight_number):
  """Scrapes the text json message from FlightAware for a given flight number.

  Given a flight number, loads the corresponding FlightAware webpage for that
  flight and extracts the relevant script that contains all the flight details
  from that page.  But only queries at most once per fixed period of time
  so as to avoid being blocked.

  Args:
    flight_number: text flight number (i.e.: SWA1234)

  Returns:
    Two tuple:
     - Text representation of the json message from FlightAware.
     - Text string of error message, if any
  """
  min_query_delay_seconds = 90
  url = 'https://flightaware.com/live/flight/' + flight_number






  global last_query_time
  seconds_since_last_query = time.time() - last_query_time
  if last_query_time and seconds_since_last_query < min_query_delay_seconds:
    error_msg = (
        'Unable to query FA for URL since last query to FA was only %d seconds '
        'ago; min of %d seconds needed: %s' % (
            seconds_since_last_query, min_query_delay_seconds, url))
    LogFlightAwareQuery(flight_number, error_msg)
    return '', error_msg

  last_query_time = time.time()

  try:
    response = requests.get(url, timeout=5)
  except requests.exceptions.RequestException as e:
    error_msg = 'Unable to query FA for URL due to %s: %s' % (e, url)
    LogFlightAwareQuery(flight_number, error_msg)
    return '', error_msg

  LogFlightAwareQuery(flight_number)




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