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Verify the challenge file exists before asking user to input randomness. #7

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Verify the challenge file exists before asking user to input randomness. #7

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9 changes: 9 additions & 0 deletions src/bin/compute.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,17 @@ use powersoftau::*;

use std::fs::OpenOptions;
use std::io::{self, Read, BufReader, Write, BufWriter};
use std::path::Path;
use std::process;

fn main() {

// Check that the user placed the challenge file into the local directory
if !Path::new("./challenge").exists() {
println!("Error: ./challenge file not found.");
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panic! here would suffice instead of pulling in std::process.

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The idea here is that a regular error message is better for users, rather than a scary panic message.

If the compute binary is to be as bare bones as possible, where fewer dependencies is deemed better, I can change to panic.

process::exit(1);
}

// Create an RNG based on a mixture of system randomness and user provided randomness
let mut rng = {
use byteorder::{ReadBytesExt, BigEndian};
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