leaves 0.3.0

# Leaves: Distributed ID Generation Service


This is a unofficial port of [Leaf](https://github.com/Meituan-Dianping/Leaf).

🏠 [Homepage](https://github.com/songzhi/leaves)

[![Latest version](https://img.shields.io/crates/v/leaves.svg)](https://crates.io/crates/leaves)

## Features

- [x] generate id in segment mode
- [ ] generate id in snowflake mode 
- [x] mysql 
- [x] redis
- [x] postgres
- [x] runtime-agnostic(tokio or async-std) when using mysql or postgres
- [ ] http server or rpc service(actually just implement it by yourself 😂)

## TODO

* more configurable
* performance
* MongoDB

## Example

Enabling the `mysql` and `runtime-tokio` feature:
```rust
use leaves::dao::mysql::MySqlLeafDao;
use leaves::LeafSegment;
use leaves::Result;

#[tokio::main]

async main() -> Result<()> {
    let dao = Arc::new(MySqlLeafDao::new("mysql://...").await?);
    let mut service = LeafSegment::new(dao);
    service.init().await?;
    let tag = 1;
    for _ in 0..1000 {
        println!("{}", service.get(tag).await?);
    }
}
```

## Benchmark

Not yet.But in my PC and local database,I used 10 tasks and each one loop 1000 times.
It costs 400ms.