picodata-rust 1.0.0

# picodata-rust

## Description

`picodata-rust` is an asynchronous Rust driver for interacting with a Picodata cluster based on PostgreSQL. It provides load balancing across nodes, automatic topology discovery, and connection pooling.

## Installation

Add the following to your `Cargo.toml`:

```toml
[dependencies]
picodata-rust = { version = "1.0.0" }
```

Enable TLS support if needed:

```toml
[dependencies]
picodata-rust = { version = "1.0.0", features = ["tls"] }
```

## Quick Start

```rust
use std::time::Duration;
use picodata_rust::{Config, connect_cfg, Client, Error};

#[tokio::main]
async fn main() -> Result<(), Error> {
    let mut pg_cfg = pg::Config::new();
    pg_cfg.host("127.0.0.1");
    pg_cfg.user("user");
    pg_cfg.password("password");
    pg_cfg.dbname("mydb");

    let mut cfg = Config {
        postgres: pg_cfg,
        pool_max_size: 10,
        discorery_interval: Duration::from_secs(1),
    };

    let client: Client = connect_cfg(cfg).await?;

    let rows = client.query(
        "SELECT id, name FROM users WHERE active = $1", 
        &[&true]
    ).await?;
    for row in rows {
        let id: i32 = row.get("id");
        let name: &str = row.get("name");
        println!("User {}: {}", id, name);
    }

    client.close().await?;
    Ok(())
}
```

## TLS Configuration Example

If you built the driver with the `tls` feature enabled in `Cargo.toml`, you can simply provide paths to your certificate files in the `Config` struct:

```rust
use std::time::Duration;
use picodata_rust::{Config, connect_cfg, Client, Error};

#[tokio::main]
async fn main() -> Result<(), Error> {
    let mut pg_cfg = pg::Config::new();
    pg_cfg.host("127.0.0.1");
    pg_cfg.user("user");
    pg_cfg.password("password");
    pg_cfg.dbname("mydb");

    let mut cfg = Config {
        postgres: pg_cfg,
        pool_max_size: 10,
        discorery_interval: Duration::from_secs(1),
        ssl_cert_file: Some("/path/to/client.crt".into()),
        ssl_key_file: Some("/path/to/client.key".into()),
        ssl_ca_file: Some("/path/to/ca-cert.pem".into()),
    };

    let client: Client = connect_cfg(cfg).await?;
    client.close().await?;
    Ok(())
}
```

## Custom Load Balancing Strategy

By default, `RoundRobin` is used, but you can supply any strategy implementing the `Strategy` trait:

```rust
use picodata_rust::{Config, client::Client, strategy::{Random, Strategy}};

let client = Client::new_with_strategy(cfg, Random).await?;
```