ez-rust-discovery 0.1.2

gRPC service discovery through Nacos
Documentation 
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## Install
```shell
cargo add ez-rust-discovery
```

## Usage Example
```rust
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // TODO Start gRPC or HTTP service.

    let manager = ServiceManager::new(ServeOptions::default())?;
    if let Err(e) = manager.online() {
        println!("online fail, caused by: {}", e);
        std::process::exit(1);
    };

    std::thread::sleep(std::time::Duration::from_secs(30));
    // TODO block Listen signal...

    // Go offline before the gRPC or HTTP service shuts down
    manager.offline()?;

    // TODO Close gRPC or HTTP service.
    Ok(())
}
```

## Environment
| Name                | Description          | Default value |
| ------------------- | -------------------- | ------------- |
| **NACOS_ADDR**      | Nacos server address |               |
| **NACOS_NAMESPACE** | Service namespace    | public        |
| **SERVICE_ADDR**    | Service address      |               |
| **SERVICE_NAME**    | Service name         |               |