Fetch block data if available

use reqwest::{Client, StatusCode};
use serde::{Deserialize, Serialize};
 
#[derive(Debug, Serialize, Deserialize)]
struct BlockDataResponse {
    data_transactions: Vec<DataTransaction>,
}
 
#[derive(Debug, Serialize, Deserialize)]
struct DataTransaction {
    data: Option<String>,       // Base-64 encoded data (optional)
    extrinsic: Option<String>,  // Base-64 encoded extrinsic (optional)
}
 
const LIGHT_CLIENT_URL: &str = "https://api.lightclient.mainnet.avail.so";
 
#[tokio::main]
async fn main() {
    let block_number = 592445; // Example block number
    let client = Client::new();
    let data_url = format!("{LIGHT_CLIENT_URL}/v2/blocks/{block_number}/data?fields=data,extrinsic");
    let response = client.get(&data_url).send().await.unwrap();
 
    match response.status() {
        StatusCode::OK => {
            let block_data: BlockDataResponse = response.json().await.unwrap();
            println!("Block data: {:?}", block_data);
        }
        StatusCode::BAD_REQUEST => {
            println!("Data not available for block {}", block_number);
        }
        _ => {
            eprintln!("Failed to get block data: {}", response.status());
        }
    }
    // ...error handling...
}