async-postgres

A runtime-independent, asynchronous PostgreSQL client.

This crate is a wrapper of tokio-postgres.

Pros

Runtime-independent, can be used on any async runtime.

Usage

Almost the same with tokio-postgres.

• TCP or UDS

use async_postgres::connect;
use std::error::Error;
use async_std::task::spawn;

async fn play() -> Result<(), Box<dyn Error>> {
    let url = "host=localhost user=postgres";
    let (client, conn) = connect(url.parse()?).await?;
    spawn(conn);
    let row = client.query_one("SELECT * FROM user WHERE id=$1", &[&0]).await?;
    let value: &str = row.get(0);
    println!("value: {}", value);
    Ok(())
}

• TLS

use async_postgres::connect_tls;
use native_tls::{Certificate, TlsConnector};
use postgres_native_tls::MakeTlsConnector;
use std::fs;
use std::error::Error;
use async_std::task::spawn;

async fn play() -> Result<(), Box<dyn Error>> {
    let cert = fs::read("database_cert.pem")?;
    let cert = Certificate::from_pem(&cert)?;
    let connector = TlsConnector::builder()
        .add_root_certificate(cert)
        .build()?;
    let connector = MakeTlsConnector::new(connector);
    let url = "host=localhost user=postgres sslmode=require";
    let (client, conn) = connect_tls(url.parse()?, connector).await?;
    spawn(conn);
    let row = client.query_one("SELECT * FROM user WHERE id=$1", &[&0]).await?;
    let value: &str = row.get(0);
    println!("value: {}", value);
    Ok(())
}

Performance

Almost the same with tokio-postgres, you can see a live benchmark here.

Develop

Running tests needs a postgres server and environment variables:

• TCP_URL="postgresql:///<db>?host=<tcp host>&port=<port>&user=<user>&password=<passwd>"
• UDS_URL="postgresql:///<db>?host=<postgres uds dir>&port=<port>&user=<user>&password=<passwd>"