def function_handler()

in traffic-light-example-python/carAggregator.py [0:0]

• 35 lines of code
• 6 McCabe index (conditional complexity)

def function_handler(event, context):
    global totalTraffic
    global totalGreenlights
    global minCars
    global maxCars
    
    # grab the light status from the event
    # Shadow JSON schema:
    # { "state": { "desired": { "property":<R,G,Y> } } }
    logger.info(event)
    lightValue = event["current"]["state"]["reported"]["property"]
    logger.info("reported light state: " + lightValue)
    if lightValue == 'G':
        logger.info("Green light")

        # generate a random number of cars passing during this green light
        cars = randint(1, 20)

        # update stats
        totalTraffic += cars
        totalGreenlights+=1
        if cars < minCars or minCars == -1:
            minCars = cars
        if cars > maxCars:
            maxCars = cars

        logger.info("Cars passed during green light: " + str(cars))
        logger.info("Total Traffic: " + str(totalTraffic))
        logger.info("Total Greenlights: " + str(totalGreenlights))
        logger.info("Minimum Cars passing: " + str(minCars))
        logger.info("Maximum Cars passing: " + str(maxCars))

        # update car stats to dynamodb every 3 green lights
        if totalGreenlights % 3 == 0:
            global tableName
            table = dynamodb.Table(tableName)
            table.put_item(
                Item={
                    'Time':str(datetime.utcnow()),
                    'TotalTraffic':totalTraffic,
                    'TotalGreenlights':totalGreenlights,
                    'MinCarsPassing':minCars,
                    'MaxCarsPassing':maxCars,
                }
            )
    return