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use std::io::{Read, Write};
use std::path::{Path, PathBuf};
use tokio::io::{AsyncReadExt, 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: &Path, file_name: &str) -> Self {
let mut path = base_dir.to_path_buf();
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 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)?;
let mut file = tokio::fs::File::create(&self.path).await?;
file.write_all(&bytes[..]).await?;
Ok(())
}
}
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