openethereum/chainspec/src/main.rs

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Rust
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extern crate serde_json;
extern crate serde_ignored;
extern crate ethjson;
use std::collections::BTreeSet;
use std::{fs, env, process};
use ethjson::spec::Spec;
fn quit(s: &str) -> ! {
println!("{}", s);
process::exit(1);
}
fn main() {
let mut args = env::args();
if args.len() != 2 {
quit("You need to specify chainspec.json\n\
\n\
./chainspec <chainspec.json>");
}
let path = args.nth(1).expect("args.len() == 2; qed");
let file = match fs::File::open(&path) {
Ok(file) => file,
Err(_) => quit(&format!("{} could not be opened", path)),
};
let mut unused = BTreeSet::new();
let mut deserializer = serde_json::Deserializer::from_reader(file);
let spec: Result<Spec, _> = serde_ignored::deserialize(&mut deserializer, |field| {
unused.insert(field.to_string());
});
if let Err(err) = spec {
quit(&format!("{} {}", path, err.to_string()));
}
if !unused.is_empty() {
let err = unused.into_iter()
.map(|field| format!("{} unexpected field `{}`", path, field))
.collect::<Vec<_>>()
.join("\n");
quit(&err);
}
println!("{} is valid", path);
}