September 2019
Beginner to intermediate
540 pages
13h 3m
English
Content preview from Learn Ethereum
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Contract proxy and delegate
This is a proxy design pattern and a popular technique that decouples DApps from the actual smart contract implementation and has the proxy as the agent sitting in-between them.
As shown in the following diagram, DApps only need to know the address of the OrderProxy smart contract address, and always invoke methods on the proxy. OrderProxy maintains a list of addresses regarding the different versions of actual smart contract implementations and knows which one is the latest version. If the smart contract needs to be upgraded, the newer version of the contract implementation will be deployed to the blockchain. The address to the latest version can be dynamically reset with the setter method on the proxy contract. ...
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