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