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//! # Configuration
//!
//! This module holds the data structures for network configuration.
use serde::{Deserialize, Serialize};
use log::{error, info};
/// Configuration for a single network
#[derive(Debug, Serialize, Deserialize, Clone, Default)]
pub struct Config {
/// Name of the network
pub name: String,
/// URL prefix for this network, can be empty
///
/// For example, if url_prefix is `example`, register at
/// `gradecoin.xyz/example/register`
pub url_prefix: String,
/// CSV file that contains the list of users who can register
///
/// Format of CSV file:
/// ```
/// User ID, Password
/// e123456,register_password
/// e123456,register_password
/// ```
/// First line is ignored.
pub preapproved_users: String,
/// Valid blocks should have this many transactions
pub block_transaction_count: u8,
/// How many zero hexadecimal characters should a correct hash start with?
pub hash_zeros: u8,
/// Inital registration bonus
pub register_bonus: u16,
/// Coinbase reward
pub block_reward: u16,
/// Transaction amount upper limit
pub tx_upper_limit: u16,
/// Transaction amount lower limit
pub tx_lower_limit: u16,
/// Transaction traffic reward
pub tx_traffic_reward: u16,
}
impl Config {
/// Read the configuration from a given `.yaml` file.
pub fn read(filename: &str) -> Option<Self> {
let file = match std::fs::File::open(filename) {
Ok(f) => f,
Err(e) => {
error!("Cannot read config file: {}", filename);
error!("Error: {:?}", e);
return None;
},
};
let config : Config = match serde_yaml::from_reader(file) {
Ok(c) => c,
Err(e) => {
error!("Cannot parse config file: {}", filename);
error!("Error: {:?}", e);
return None;
},
};
// File closes automatically when it goes out of scope.
info!("Config file read successfully: {}", filename);
Some(config)
}
}
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