Vow

Serde <--> File made easy.

Vow is a simple but generic data binding library for Rust. It allows you to bind any type that implements Serialize + DeserializeOwned to a file, and keeps the file up-to-date while supporting multiple backends (both synchronous and asynchronous).

Supported backends:

• tokio (async)
• compio (async)
• async-std (async)
• std::fs (blocking)

Supported formats:

• json
• toml

Example

use serde::{Deserialize, Serialize};
use vow::*;

#[derive(Serialize, Deserialize)]
struct MyData {
    a: i32,
    b: String,
}

#[compio::main]
async fn main() {
    let mut data = VowAsync::open_compio("/tmp/data.json")
        .default(MyData {
            a: 42,
            b: "hello".to_string(),
        })
        .overwrite_local()
        .build()
        .await
        .unwrap();

    assert_eq!(data.a, 42);
    data.update(|data| data.a += 1).await.unwrap();
    assert_eq!(data.a, 43);

    data.update(|data| data.b += " world!").await.unwrap();
    assert_eq!(data.b, "hello world!");

    data.map(|data| MyData {
        b: String::new(),
        ..data
    })
    .await
    .unwrap();
    assert_eq!(data.b, "");
}

For more examples, see the examples directory.