Define a procedural macro for implementing administration functions easily

[killme2008]

What type of enhancement is this?

Tech debt reduction

What does the enhancement do?

Let's define a procedural macro to make implementing administration functions easier, for example, we can implement the procedure_state as below:

#[admin_fn(name = "procedure_state", return = "StringVector")]
async fn procedure_state(procedure_service_handler: &ProcedureServiceHandlerRef, pid: &str) -> Result<String > {
    let ProcedureStateResponse { status, error, .. } =                    
        procedure_service_handler.query_procedure_state(pid).await?;
    let status = ProcedureStatus::try_from(status)
        .map(|v| v.as_str_name())
        .unwrap_or("Unknown");

    let state = ProcedureStateJson {
        status: status.to_string(),
        error: if error.is_empty() { None } else { Some(error) },
    };

    Ok(Some(serde_json::to_string(&state).unwrap_or_default()))                                
}

Implementation challenges

No response