Do I need a visa for a 22 hour layover in Changhai?

I am a Canadian. I’m flying China Eastern Airlines from Toronto to Indonesia on Dec 6th. I have a 22 hour layover in Changhai.
Do I require entry permit to leave the airport during my layover?
If yes, can I obtain the entry permit at the airport when I arrive in Changhai?
If not, would it be possible to obtain one prior to my flight departure Dec 6th. If yes, what is required to obtain the one prior to Dec 6th? What is the cost to obtain the visa?
Thank you for your kind assistance.
Linda Colby