Improve bootstraping: do it regularly; persist peer list

src/util/lib.rs

@@ -5,4 +5,5 @@ pub mod background;
 pub mod config;
 pub mod data;
 pub mod error;
+pub mod persister;
 pub mod time;

src/util/persister.rs

@@ -0,0 +1,62 @@
+use std::io::{Read, Write};
+use std::path::PathBuf;
+
+use tokio::io::AsyncWriteExt;
+
+use serde::{Deserialize, Serialize};
+
+use crate::data::*;
+use crate::error::Error;
+
+pub struct Persister<T: Serialize + for<'de> Deserialize<'de>> {
+	path: PathBuf,
+
+	_marker: std::marker::PhantomData<T>,
+}
+
+impl<T> Persister<T>
+where
+	T: Serialize + for<'de> Deserialize<'de>,
+{
+	pub fn new(base_dir: &PathBuf, file_name: &str) -> Self {
+		let mut path = base_dir.clone();
+		path.push(file_name);
+		Self {
+			path,
+			_marker: Default::default(),
+		}
+	}
+
+	pub fn load(&self) -> Result<T, Error> {
+		let mut file = std::fs::OpenOptions::new().read(true).open(&self.path)?;
+
+		let mut bytes = vec![];
+		file.read_to_end(&mut bytes)?;
+
+		let value = rmp_serde::decode::from_read_ref(&bytes[..])?;
+		Ok(value)
+	}
+
+	pub fn save(&self, t: &T) -> Result<(), Error> {
+		let bytes = rmp_to_vec_all_named(t)?;
+
+		let mut file = std::fs::OpenOptions::new()
+			.write(true)
+			.create(true)
+			.truncate(true)
+			.open(&self.path)?;
+
+		file.write_all(&bytes[..])?;
+
+		Ok(())
+	}
+
+	pub async fn save_async(&self, t: &T) -> Result<(), Error> {
+		let bytes = rmp_to_vec_all_named(t)?;
+
+		let mut file = tokio::fs::File::create(&self.path).await?;
+		file.write_all(&bytes[..]).await?;
+
+		Ok(())
+	}
+}