Returning Message and Blocking Until Message Received in Discord.py

Question

I'm trying to have a while loop that has a blocking function, and returns the message from discord.py when a message is detected. Here is my current attempt:

lient = discord.Client()


@client.event
async def on_ready():
    print('We have logged in as {0.user}'.format(client))

@client.event
async def on_message(message):
    print('got message')
    if message.author == client.user:
        return
    return message.content

def main():
    loop = asyncio.get_event_loop()

    message = loop.run_until_complete(on_message())
    print(message)


client.run(config["DISCORD_TOKEN"])
if __name__ == "__main__":
    main()

Unfortunately, it doesn't return the message when one is detected. Any ideas on how to solve this issue?