Here is an article about filtering data directly in Solana Rust before retrieving it in Node.js:
Filtering Data Directly on the Blockchain: A Guide for Solana Rust Programmers
As a Solana Rust Programmer, you are probably familiar with the convenience of retrieving data from the Solana Network. However, filtering data directly in Solana can be useful for a number of reasons. In this article, we will explore how to filter data on-chain using Solana’s Rust API.
Why Filter Data Directly?
Before diving into the solution, let’s quickly discuss why filtering data directly is a good idea:
- Better Performance: Retrieving and filtering data in Node.js can be slow due to the latency between client-side JavaScript code and the Solana blockchain. By doing it on-chain, you can avoid this overhead.
- Better Security: Chain filtering reduces the attack surface by minimizing the amount of data that is transmitted over the network.
- Simplified Development
: Direct filtering makes your Rust program more self-contained and easier to maintain.
Filtering Data Directly in Solana
If you want to filter data directly in your Solana Rust program, you need to use the solana-program box. Here is a step-by-step guide:
1. Add dependencies
First, add the “solana-program” box as a dependency in your “Cargo.toml” file:
[dependencies]
solana_program = "1.6.2"
2. Define your filter function
Create a new Rust function that takes a part of solana_value_t and returns the filtered collection. For example:
use solana_program::{
account_info::AccountInfo,
entrypoint,
startpoint::{get_filter_fn, get_oracle_filter_fn},
program_error::ProgramError,
};
use std::collections::HashSet;
async fn filter_values(values: &[solana_value_t]) -> Result, ProgramError> {
let mut filtered_values = HashSet::new();
for value in values {
// Your filtering logic goes here
if *value like i16 > 0 { // Replace with your actual filter condition
filtered_values.insert(*value);
}
}
Ok(filtered_values)
}
3. Create a filter function
Now create an entry point function that wraps the ‘filter_values’ function and calls it when the program is executed:
#[entrypoint]
async fn main() -> Result<(), ProgramError> {
let filter_fn = get_filter_fn! {
"your_filter_function_name" => vec![
"value1",
1,
"value2",
0,
"value3",
1,
],
};
let values = solana_value_t::from_slice(b"value1 value2");
match filter_values(&values) {
Ok(filtered_values) => {
// Process filtered values
println!("Filtered values: {:?}", filtered_values);
}
Err(err) => {
eprintln!("Error filtered values: {}", err);
}
}
Ok (())
}
4. Call the Node.js filter function
When retrieving data, call the ‘filter_values’ function before retrieving to filter the data in the string. Here is an example:
const program = await get_oracle_filter_fn!(
"your_filter_function_name",
[
{
name: "value1",
type: "u8",
value: 0,
},
{
name: "value2",
type: "i16",
value: 5,
},
],
);
const on_chain_data = await fetch_data();
const filtered_on_chain_data = await filter_values(&on_chain_data);
Conclusion
In this article, we have shown how to filter data directly in a Solana Rust program before retrieving it in Node.js. This way you can improve performance, reduce security risks, and simplify development.
