General Information

Question

I know tezos strongly believes in immutability but I would like to clear out some curiosity regarding upgradability of a contract.

1. If a function in a contract needs to be updated with it's logic , how can we do that?

2. If we want to add a new function in an already originated contract, Is it possible or do we need to deploy a whole new contract ?

3. How do we handle bugs if we get some issue in mainnet contract ? How are other product of tezos handling this ? Are there any example where a mainnet contract gets an issue and how was that issue handled?

4. Is there any concept like OpenZeppelin(tools for deploying upgradeable smart contracts in solidity) in tezos ?

Looking forward for the answers.

Answer 1

• 1,2. This is done by storing a lambda in a map/big_map and then calling it from the entry-point. That way you can update the logic of the entry point by storing another lambda.
• 3. You should create a mechanism to handle this. (e.i. make the contract pausable)
• 4. Yes, it is called lazy entry-points in smartpy. Here is also an example in ligo.

I am of the opinion that most contract's code should be final once they get deployed. Using a proxy approach is almost always preferable.