Blockchain By Example

Reading the storage of a remote contract

In our project, we have a Ctontine contract that instantiates a Cplayer object. As we presented in the game design, the player should sign up using the Cplayer contract, and then join the game using the Ctontine contract. This implies that the Cplayer contract manages the player details and that Ctontine needs to access them.

In Ethereum, each contract has its own storage space, which can’t be accessed directly or overridden by another contract. Given the ContractA and ContractB contracts, the former can only access the storage of the latter by invoking a method (getter) that returns data from the storage of ContractB.

I’ll make an exception for the preceding rule. A contract can access three things ...