# Background

[Vtalike]

Background

The ContractsInfo type is current the tuple (Salt, Bytes32) where the Salt records the salt used to create the contract, and the Bytes32 is the Merkle root of the given contract. The salt is non-protocol level data, while the Merkle root is protocol level data. This coupling of non-protocol and protocol level data is unnecessary, and we can decouple these data points.

Solution

One solution stems from recognizing that we do not need to store the Merkle root in on-chain storage. During CROO execution, we can instead recalculate the contract's Merkle root from the contract data loaded from storage. This removes the dependency on ContractInfo during CROO and other on-chain operations. We can then remove the Merkle root from the ContractsInfo type and store only the salt, allowing ContractsInfo to be an off-chain only data type.

With the simplified ContractsInfo type, we can apply the versioned enum idiom to allow simple upgrades.

Criteria

• Remove the contract root from the ContractsInfo table in fuel-vm (feat: Remove ContractsInfo FuelLabs/fuel-vm#673)
• During CROO, the contract's root is recalculated reading the contract data from storage and applying the root calculation (feat: Remove ContractsInfo FuelLabs/fuel-vm#673)
• The ContractsInfo type is versioned using an enum (feat: Remove ContractsInfo FuelLabs/fuel-vm#673)
• fuel-core is updated to use the versioned type of the ContractsInfo table (feat: Add ContractInfo table and versionable ContractInfoType to on-chain storage FuelLabs/fuel-core#1657)

最初由 @bvrooman 在 FuelLabs/fuel-core#1654 发布