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CPI Between Programs Using Anchor Versions: Raydium-CP-swap Step-by-Step Guide
As an Anchor developer, you are probably familiar with the concept of Cross-Program (CP) swap, which allows you to run different programs on the Anchor blockchain without degrading it. However, when using a library like “raydium-cp-swap”, it is important to understand how CPI (Cross-Program Interoperability) works between programs using two different Anchor versions.
Issue: Downgrading
Running an application with an older version of Anchor alongside another application with a newer version can cause issues due to differences in their architecture and software. This is where downgrading comes in. However, if you are using “raydium-cp-swap”, which uses Anchor version 0.29.0 (code), you might be concerned about a downgrade.
Solution: No-drop IPC
To solve this problem, we will explore a few approaches for CPI programs that use two different Anchor versions.
- Update to the latest application: Update an application using an older version of Anchor (e.g. 0.30.1) to match or be compatible with the latest version of Anchor (0.29.0). This requires careful consideration of the software architecture and compatibility issues.
- Use a compatibility layer
: Implement a compatibility layer, such as a custom library or service that resolves the differences between Anchor versions. This way, you can ensure that the program interoperates with both versions without worrying about a downgrade.
- Optimize for compatibility: If none of the above options are possible, optimize the program to be more compatible with the different versions of Anchor. For example, you can rewrite the code to be more suitable for specific Anchor versions.
Implementation
In this article, we will focus on the first approach: updating the latest program to match or be compatible with an older version of Anchor. Here is an example of updating the code using raydium-cp-swap:
use raydium_cp_swap ::{AnchorVersion, Program};
use Anchor_lang :: program :: ProgramResult;
fn main() -> ProgramResult {
let mut supplier = AnchorStore::new(&Key::from_static(b"your_program_name"));
supplier.set_next_version(0.29.0);
// Update the program to match or be compatible with 0.30.1
supplier.upgrade::("upgrade", "Your program")?;
let update_program = supplier.get();
// You can now run version 0.30.1 using the updated library
ok(())
}
Conclusion
PCI between programs using two different Anchor versions can be difficult. However, by exploring updates and compatibility layers or optimizing compatibility, you can ensure a smooth transition to new Anchor versions. Remember to weigh the tradeoffs of updating the program against the potential performance impact.
If you are looking for more information on implementing `raydium-cp-swap’ or looking for compatibility solutions, feel free to ask!
