pg-proto 0.2.2

Session-typed PostgreSQL wire protocol
Documentation 
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//! Runs a transparent proxy which logs every frontend and backend protocol message.

#[path = "../proxy_support/mod.rs"]
mod proxy_support;

use std::{env, error::Error, net::SocketAddr, sync::Arc};

use proxy_support::Observation;
use tokio::net::TcpListener;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let listen = address(1, "127.0.0.1:6432")?;
    let upstream = proxy_support::ExampleUpstream::resolve(env::args().nth(2).as_deref()).await?;
    let upstream_address = upstream.address();
    let tls = proxy_support::ExampleTlsIdentity::generate()?;
    let listener = TcpListener::bind(listen).await?;
    println!("protocol logging proxy listening on {listen}; upstream is {upstream_address}");

    proxy_support::serve(
        listener,
        upstream_address,
        tls,
        Arc::new(|event| {
            if let Observation::Protocol {
                connection,
                direction,
                message,
            } = event
            {
                println!("[{connection}] {direction}: {message}");
            }
        }),
    )
    .await?;
    Ok(())
}

fn address(argument: usize, default: &str) -> Result<SocketAddr, Box<dyn Error>> {
    Ok(env::args()
        .nth(argument)
        .as_deref()
        .unwrap_or(default)
        .parse()?)
}