From f11bd80d2a0b8ba0c108deab1293daa31109ce5f Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 5 Apr 2021 20:33:24 +0200
Subject: Keep old data

---
 src/util/persister.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/util')

diff --git a/src/util/persister.rs b/src/util/persister.rs
index f4e8cd72..93b7cdf4 100644
--- a/src/util/persister.rs
+++ b/src/util/persister.rs
@@ -1,7 +1,7 @@
 use std::io::{Read, Write};
 use std::path::PathBuf;
 
-use tokio::io::AsyncWriteExt;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
 use serde::{Deserialize, Serialize};
 
@@ -51,6 +51,16 @@ where
 		Ok(())
 	}
 
+	pub async fn load_async(&self) -> Result<T, Error> {
+		let mut file = tokio::fs::File::open(&self.path).await?;
+
+		let mut bytes = vec![];
+		file.read_to_end(&mut bytes).await?;
+
+		let value = rmp_serde::decode::from_read_ref(&bytes[..])?;
+		Ok(value)
+	}
+
 	pub async fn save_async(&self, t: &T) -> Result<(), Error> {
 		let bytes = rmp_to_vec_all_named(t)?;
 
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