Init

[?]

Jun 4, 2021, 9:08 AM

NPSWSVZNDMXYBVCBFSHZ2PVLUSX45LZVUMD6ROS3KLHNMBTYASZQC

Dependencies

Change contents

file addition: src (d--r------)

[1.0]
file addition: main.rs (----------)

[0.6]

use etcd_client::Client;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Request, Response, Server, StatusCode};
use log::*;
use std::convert::Infallible;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::sync::watch::*;
use tokio::sync::Mutex;
use tokio_postgres::NoTls;

const LEASE_DURATION: i64 = 10;

#[tokio::main]
async fn main() {
env_logger::init();
let matches = clap::App::new("Postrep")
.version("0.1")
.author("Pierre-Étienne Meunier <pe@pijul.org>")
.arg(
clap::Arg::with_name("host")
.long("host")
.help("Name of this host")
.required(true)
.takes_value(true),
)
.arg(
clap::Arg::with_name("signal")
.long("signal")
.help("Path to the postgres signal file")
.required(true)
.takes_value(true),
)
.arg(clap::Arg::with_name("port").long("port").takes_value(true))
.arg(clap::Arg::with_name("password").long("password").takes_value(true))
.get_matches();

let (db, connection) = tokio_postgres::connect("host=localhost user=postgres", NoTls)
.await
.unwrap();
let db = Arc::new(Mutex::new(db));
let dbt = tokio::spawn(async move {
if let Err(e) = connection.await {
eprintln!("connection error: {}", e);
}
});
tokio::pin!(dbt);
let host = matches.value_of("host").unwrap().to_string();
let signal = matches.value_of("signal").unwrap().to_string();
let password = matches.value_of("password").unwrap().to_string();

let (lead, is_leader) = channel(false);
let lead = Arc::new(lead);
let mut election_observer = tokio::spawn(observe_elections(
host.clone(),
signal.clone(),
password.clone(),
lead.clone(),
db.clone(),
));
let mut race = tokio::spawn(race(
host.clone(),
signal.clone(),
lead.clone(),
is_leader.clone(),
));
let addr = SocketAddr::from((
[0, 0, 0, 0],
matches
.value_of("port")
.and_then(|x| x.parse().ok())
.unwrap_or(8008),
));
let make_service = make_service_fn(move |_conn| {
let is_leader = is_leader.clone();
async move { Ok::<_, Infallible>(service_fn(move |req| handle(req, is_leader.clone()))) }
});
loop {
tokio::select!(
_ = Server::bind(&addr).serve(make_service.clone()) => {
debug!("http server stopping");
break
},
_ = &mut dbt => {
// If this database breaks, release the lock.
tokio::time::sleep(std::time::Duration::from_secs(1)).await;
info!("Restarting database connection");
let (db_, connection) = if let Ok(x) = tokio_postgres::connect("host=localhost user=postgres", NoTls).await {
x
} else {
tokio::time::sleep(std::time::Duration::from_millis(100)).await;
continue
};
lead.send(false).unwrap();
dbt.set(tokio::spawn(async move {
if let Err(e) = connection.await {
eprintln!("connection error: {}", e);
}
}));
*db.lock().await = db_
}
_ = &mut race => {
debug!("race stopped");
break
}
_ = &mut election_observer => {
debug!("election observer stopped");
break
}
)
}
}

async fn handle(
_req: Request<Body>,
is_leader: Receiver<bool>,
) -> Result<Response<Body>, Infallible> {
if *is_leader.borrow() {
Ok(Response::new(Body::from("OK")))
} else {
let mut resp = Response::new(Body::from("Not OK"));
*resp.status_mut() = StatusCode::NOT_FOUND;
Ok(resp)
}
}

async fn race(
host: String,
signal: String,
lead: Arc<Sender<bool>>,
mut is_leader: Receiver<bool>,
) -> Result<(), anyhow::Error> {
loop {
let mut client = Client::connect(["localhost:2379"], None).await.unwrap();
let lease = client.lease_grant(LEASE_DURATION, None).await?;
let id = lease.id();
info!("Taking lock {:x?}", id);
let mut lock = client.campaign("postrep", host.as_str(), id).await?;

debug!("lock = {:?}", lock);
let (mut keeper, _stream) = client.lease_keep_alive(id).await?;
let is_leader_ = is_leader.clone();
let t = tokio::spawn(async move {
tokio::time::sleep(std::time::Duration::from_secs(LEASE_DURATION as u64 / 2)).await;
while *is_leader_.borrow() {
debug!("sending keep alive");
if let Err(e) = keeper.keep_alive().await {
error!("{:?}", e);
break;
}
tokio::time::sleep(std::time::Duration::from_secs(LEASE_DURATION as u64 / 2)).await;
}
debug!("done renewing");
});

let leader = lock.take_leader().unwrap();
info!("Lock acquired: {:?}", leader);
std::fs::remove_file(&signal).unwrap_or(());
lead.send(true).unwrap();
debug!("waiting for instance to become non-leader");
loop {
is_leader.changed().await.unwrap();
debug!("changed: {:?}", is_leader.borrow());
if !*is_leader.borrow() {
info!("Lock released");
// at.store(false, Ordering::SeqCst);
t.await.unwrap();
client
.resign(Some(etcd_client::ResignOptions::new().with_leader(leader)))
.await?;
break;
}
}
}
}

async fn observe_elections(
host: String,
signal: String,
password: String,
lead: Arc<Sender<bool>>,
pool: Arc<Mutex<tokio_postgres::Client>>,
) -> Result<(), anyhow::Error> {
let mut client = Client::connect(["localhost:2379"], None).await?;
let mut obs = client.observe("postrep").await?;
while let Some(m) = obs.message().await? {
debug!("obs: {:?}", m);
let leader = m.kv().unwrap().value_str()?;
if leader != host {
info!("The leader is {:?}", leader);
std::fs::write(&signal, "").unwrap_or(());
lead.send(false).unwrap();
} else {
info!("I'm the leader");
std::fs::remove_file(&signal).unwrap_or(());
lead.send(true).unwrap();
}
let pool = pool.lock().await;
pool.execute(format!("ALTER SYSTEM SET primary_conninfo='host={} port=5432 user=replication password={}'", leader, password).as_str(), &[]).await?;
}
Ok(())
}
file addition: default.nix (----------)

[1.0]

with import <nixpkgs> {};
clangStdenv.mkDerivation rec {
name = "nest-env";
PROTOC="${protobuf}/bin/protoc";
}
file addition: README.md (----------)

[1.0]

## Postrep, a basic PostgreSQL custering tool

Postrep uses a fixed replication strategy (streaming replication), a fixed leader election tool (Etcd 3), to achieve proper failover when the cluster leader fails.
file addition: Cargo.toml (----------)

[1.0]

[package]
name = "postrep"
version = "0.1.0"
authors = ["Pierre-Étienne Meunier <pmeunier@mailbox.org>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
etcd-client = "*"
futures = "*"
tokio = { version = "1.4", features = [ "net", "time", "rt-multi-thread", "macros", "io-util", "fs", "sync", "signal" ] }
hyper = "*"
clap = "*"
anyhow = "*"
log = "*"
env_logger = "*"
tokio-postgres = "*"
file addition: Cargo.lock (----------)

[1.0]

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