in response to:Impl serde::Serialize Deserialize for ContractClass #550

[Cevedale]

You're facing challenges while implementing serde serialization and deserialization for your Rust structs, primarily related to the ContractClass enum and its variants. Here's a mini explanation of the issues as i understood:

The error message indicates that the ContractClass enum isn't correctly implementing the Deserialize trait. This trait is crucial for deserializing the enum from a serialized format. While the error message mentions that some types implement Deserialize, it's not properly implemented for ContractClassV1.

[Implementing Deserialize for ContractClassV1+] To address this issue, you need to manually implement the Deserialize trait for the ContractClassV1 variant of your ContractClass enum. This allows you to handle specific deserialization logic for ContractClassV1.

Example:

use serde::Deserialize;

impl<'de> Deserialize<'de> for ContractClassV1 {
fn deserialize(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
// Implement the deserialization logic here.
}

To use serde for both serialization and deserialization, it's essential to implement the Serialize trait for your structs. The Serialize trait defines how your data structures are serialized into formats like JSON.

This should work:

use serde::Serialize;

#[derive(Serialize)]
pub struct StarknetConfig {
// Fields of StarknetConfig
}
For a more efficient approach to maintain state data between local chain runs, consider using a database or a file system for storage and retrieval. Rust libraries such as sled are popular for key-value storage, and the standard std::fs module can be used for file-based storage. Storing state in memory and serializing/deserializing as needed may not be optimal for long-term persistence.

If you're working on an open-source project like Katana, collaborating with the project maintainers or community is valuable. They can provide guidance on addressing these issues and may have plans to implement Deserialize for ContractClassV1.

consult the serde documentation (https://serde.rs/).
lmk if you have more questions