lighthouse/eth2/utils/eth2_testnet_config/build.rs

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/// Pulls down the latest Lighthouse testnet from https://github.com/eth2-clients/eth2-testnets
use reqwest;
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
const TESTNET_ID: &str = "testnet5";
fn main() {
if !base_dir().exists() {
std::fs::create_dir_all(base_dir()).expect(&format!("Unable to create {:?}", base_dir()));
match get_all_files() {
Ok(()) => (),
Err(e) => {
std::fs::remove_dir_all(base_dir()).expect(&format!(
"{}. Failed to remove {:?}, please remove the directory manually because it may contains incomplete testnet data.",
e,
base_dir(),
));
panic!(e);
}
}
}
}
pub fn get_all_files() -> Result<(), String> {
get_file("boot_enr.yaml")?;
get_file("config.yaml")?;
get_file("deploy_block.txt")?;
get_file("deposit_contract.txt")?;
get_file("genesis.ssz")?;
Ok(())
}
pub fn get_file(filename: &str) -> Result<(), String> {
let url = format!(
"https://raw.githubusercontent.com/eth2-clients/eth2-testnets/master/lighthouse/{}/{}",
TESTNET_ID, filename
);
let path = base_dir().join(filename);
let mut file =
File::create(path).map_err(|e| format!("Failed to create {}: {:?}", filename, e))?;
let mut response =
reqwest::get(&url).map_err(|e| format!("Failed to download {}: {}", filename, e))?;
let mut contents: Vec<u8> = vec![];
response
.copy_to(&mut contents)
.map_err(|e| format!("Failed to read {} response bytes: {}", filename, e))?;
file.write(&contents)
.map_err(|e| format!("Failed to write to {}: {:?}", filename, e))?;
Ok(())
}
fn base_dir() -> PathBuf {
env::var("CARGO_MANIFEST_DIR")
.expect("should know manifest dir")
.parse::<PathBuf>()
.expect("should parse manifest dir as path")
.join(TESTNET_ID)
}