Solana: Generation IDL Igno ignores the symptoms of rust
As a developer working on several versions of Solana using Rust’s Anchor Idl Compiler, we have encountered a problem when functions are not used in the generated code. This can lead to irregularities and maintenance problems when transitioning between different versions of the program.
Problem: Functional symptoms and anchor
Rust Feature flags work with the evaluation of specific conditions at the time of the compilation, allowing developers to conditionally include or exclude code based on the destination environment (eg Solana 1.x or 2.0). In the IDL compilation for Solana, these features are shown as Rust CFG attributes.
When using multiple versions of the program with feature symptoms, it can be difficult to ensure that the generated code accurately reflects the desired configuration. For example, if we want to use API Solan 1.x and 2.0 in our program, we may need to generate a separate idl for each version. However, the current implementation of the anchor does not take into account this complexity.
Problem: Ignored signs of functions
When compiling a new project using an anchor, it generates the Cargo Busut IDL file, which contains all the functions allowed in the default setting. This can lead to unexpected behavior if we try to target multiple versions of Solana. Specifically, when using signs of features with an IDL compiler Anchor, any changes to the code through these symptoms are not reflected in the generated IDL.
To illustrate this problem, consider a simple example:
`rust
// SRC/MAIN.RS
#[cfg (function = “v1_0”)]
Mod api1;
#[cfg (function = “v2_0_0”)]
Mod api2;
Fn Main () {
// …
}
`
In this example, the “API1was generated for Solan 1.x (default version), but in our program we want to use API Solana 1.x and 2.0.
If we create a project only withV1_0, file Api1.rswill contain all the enabled features, including V2_0_0. However, if we try to assemble usingV2_0_0, the generated code will not properly reflect the desired configuration.
Solution: Configuration of your own anchor
To solve this problem, we need a way to adapt the behavior of the Anchor Symptom for each version of Solan. One possible solution is to create a separate configuration file that defines the destination environment and all custom functions needed for a particular version of Solana.
Here is an example of how we could edit our filecargo.toml:
Toml
[Package]
Name = "my_solana_program"
version = "0.1.0"
[Functions]
v1_0 = []
v2_0_0 = []
With this configuration when we create a project only with V1_0, fileApi1.rs correctly reflect the desired configuration.
Then we can create a separate IDL file for each version of Solan and include all relevant features in both files. Finally, when we want to use more solany versions in our program, we simply need to generate different idls using an IDL IDL compiler.
Proven procedures
Consider the following proven procedures to maintain updateability of your Solana programs:
- Use
#[CFG (function = &" v2_0_0 ")]instead of symptoms of hardcoding features in your code.
- Create a separate configuration file that defines the target environment and all custom functions needed for each version of Solana.
- Use an IDL compiler Anchor to generate a separate IDL for each version of Solan, instead of relying on hard signs of features.
By last adherence to these proven procedures and using the Anchor IDL compiler, you can ensure that your Solana programs keep consistency in different versions while taking advantage of the most recent features available.