{"header":{"message":"Init","description":null,"timestamp":"2021-06-04T09:08:52.027227355Z","authors":[{"full_name":"Pierre-Étienne Meunier","name":"pmeunier"}]},"hash":"NPSWSVZNDMXYBVCBFSHZ2PVLUSX45LZVUMD6ROS3KLHNMBTYASZQC","authors":[],"deps":{"hashes":[["NPSWSVZNDMXYBVCBFSHZ2PVLUSX45LZVUMD6ROS3KLHNMBTYASZQC","Init"],["AA",null]],"deps":[],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"src","metadata":576},"context":[{"change":1,"pos":0}],"contents":[]}},{"FileAdd":{"meta":{"basename":"main.rs","metadata":0},"context":[{"change":0,"pos":6}],"contents":[{"Add":"use etcd_client::Client;"},{"Add":"use hyper::service::{make_service_fn, service_fn};"},{"Add":"use hyper::{Body, Request, Response, Server, StatusCode};"},{"Add":"use log::*;"},{"Add":"use std::convert::Infallible;"},{"Add":"use std::net::SocketAddr;"},{"Add":"use std::sync::Arc;"},{"Add":"use tokio::sync::watch::*;"},{"Add":"use tokio::sync::Mutex;"},{"Add":"use tokio_postgres::NoTls;"},{"Add":""},{"Add":"const LEASE_DURATION: i64 = 10;"},{"Add":""},{"Add":"#[tokio::main]"},{"Add":"async fn main() {"},{"Add":" env_logger::init();"},{"Add":" let matches = clap::App::new(\"Postrep\")"},{"Add":" .version(\"0.1\")"},{"Add":" .author(\"Pierre-Étienne Meunier \")"},{"Add":" .arg("},{"Add":" clap::Arg::with_name(\"host\")"},{"Add":" .long(\"host\")"},{"Add":" .help(\"Name of this host\")"},{"Add":" .required(true)"},{"Add":" .takes_value(true),"},{"Add":" )"},{"Add":" .arg("},{"Add":" clap::Arg::with_name(\"signal\")"},{"Add":" .long(\"signal\")"},{"Add":" .help(\"Path to the postgres signal file\")"},{"Add":" .required(true)"},{"Add":" .takes_value(true),"},{"Add":" )"},{"Add":" .arg(clap::Arg::with_name(\"port\").long(\"port\").takes_value(true))"},{"Add":" .arg(clap::Arg::with_name(\"password\").long(\"password\").takes_value(true))"},{"Add":" .get_matches();"},{"Add":""},{"Add":" let (db, connection) = tokio_postgres::connect(\"host=localhost user=postgres\", NoTls)"},{"Add":" .await"},{"Add":" .unwrap();"},{"Add":" let db = Arc::new(Mutex::new(db));"},{"Add":" let dbt = tokio::spawn(async move {"},{"Add":" if let Err(e) = connection.await {"},{"Add":" eprintln!(\"connection error: {}\", e);"},{"Add":" }"},{"Add":" });"},{"Add":" tokio::pin!(dbt);"},{"Add":" let host = matches.value_of(\"host\").unwrap().to_string();"},{"Add":" let signal = matches.value_of(\"signal\").unwrap().to_string();"},{"Add":" let password = matches.value_of(\"password\").unwrap().to_string();"},{"Add":""},{"Add":" let (lead, is_leader) = channel(false);"},{"Add":" let lead = Arc::new(lead);"},{"Add":" let mut election_observer = tokio::spawn(observe_elections("},{"Add":" host.clone(),"},{"Add":" signal.clone(),"},{"Add":" password.clone(),"},{"Add":" lead.clone(),"},{"Add":" db.clone(),"},{"Add":" ));"},{"Add":" let mut race = tokio::spawn(race("},{"Add":" host.clone(),"},{"Add":" signal.clone(),"},{"Add":" lead.clone(),"},{"Add":" is_leader.clone(),"},{"Add":" ));"},{"Add":" let addr = SocketAddr::from(("},{"Add":" [0, 0, 0, 0],"},{"Add":" matches"},{"Add":" .value_of(\"port\")"},{"Add":" .and_then(|x| x.parse().ok())"},{"Add":" .unwrap_or(8008),"},{"Add":" ));"},{"Add":" let make_service = make_service_fn(move |_conn| {"},{"Add":" let is_leader = is_leader.clone();"},{"Add":" async move { Ok::<_, Infallible>(service_fn(move |req| handle(req, is_leader.clone()))) }"},{"Add":" });"},{"Add":" loop {"},{"Add":" tokio::select!("},{"Add":" _ = Server::bind(&addr).serve(make_service.clone()) => {"},{"Add":" debug!(\"http server stopping\");"},{"Add":" break"},{"Add":" },"},{"Add":" _ = &mut dbt => {"},{"Add":" // If this database breaks, release the lock."},{"Add":" tokio::time::sleep(std::time::Duration::from_secs(1)).await;"},{"Add":" info!(\"Restarting database connection\");"},{"Add":" let (db_, connection) = if let Ok(x) = tokio_postgres::connect(\"host=localhost user=postgres\", NoTls).await {"},{"Add":" x"},{"Add":" } else {"},{"Add":" tokio::time::sleep(std::time::Duration::from_millis(100)).await;"},{"Add":" continue"},{"Add":" };"},{"Add":" lead.send(false).unwrap();"},{"Add":" dbt.set(tokio::spawn(async move {"},{"Add":" if let Err(e) = connection.await {"},{"Add":" eprintln!(\"connection error: {}\", e);"},{"Add":" }"},{"Add":" }));"},{"Add":" *db.lock().await = db_"},{"Add":" }"},{"Add":" _ = &mut race => {"},{"Add":" debug!(\"race stopped\");"},{"Add":" break"},{"Add":" }"},{"Add":" _ = &mut election_observer => {"},{"Add":" debug!(\"election observer stopped\");"},{"Add":" break"},{"Add":" }"},{"Add":" )"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"async fn handle("},{"Add":" _req: Request,"},{"Add":" is_leader: Receiver,"},{"Add":") -> Result, Infallible> {"},{"Add":" if *is_leader.borrow() {"},{"Add":" Ok(Response::new(Body::from(\"OK\")))"},{"Add":" } else {"},{"Add":" let mut resp = Response::new(Body::from(\"Not OK\"));"},{"Add":" *resp.status_mut() = StatusCode::NOT_FOUND;"},{"Add":" Ok(resp)"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"async fn race("},{"Add":" host: String,"},{"Add":" signal: String,"},{"Add":" lead: Arc>,"},{"Add":" mut is_leader: Receiver,"},{"Add":") -> Result<(), anyhow::Error> {"},{"Add":" loop {"},{"Add":" let mut client = Client::connect([\"localhost:2379\"], None).await.unwrap();"},{"Add":" let lease = client.lease_grant(LEASE_DURATION, None).await?;"},{"Add":" let id = lease.id();"},{"Add":" info!(\"Taking lock {:x?}\", id);"},{"Add":" let mut lock = client.campaign(\"postrep\", host.as_str(), id).await?;"},{"Add":""},{"Add":" debug!(\"lock = {:?}\", lock);"},{"Add":" let (mut keeper, _stream) = client.lease_keep_alive(id).await?;"},{"Add":" let is_leader_ = is_leader.clone();"},{"Add":" let t = tokio::spawn(async move {"},{"Add":" tokio::time::sleep(std::time::Duration::from_secs(LEASE_DURATION as u64 / 2)).await;"},{"Add":" while *is_leader_.borrow() {"},{"Add":" debug!(\"sending keep alive\");"},{"Add":" if let Err(e) = keeper.keep_alive().await {"},{"Add":" error!(\"{:?}\", e);"},{"Add":" break;"},{"Add":" }"},{"Add":" tokio::time::sleep(std::time::Duration::from_secs(LEASE_DURATION as u64 / 2)).await;"},{"Add":" }"},{"Add":" debug!(\"done renewing\");"},{"Add":" });"},{"Add":""},{"Add":" let leader = lock.take_leader().unwrap();"},{"Add":" info!(\"Lock acquired: {:?}\", leader);"},{"Add":" std::fs::remove_file(&signal).unwrap_or(());"},{"Add":" lead.send(true).unwrap();"},{"Add":" debug!(\"waiting for instance to become non-leader\");"},{"Add":" loop {"},{"Add":" is_leader.changed().await.unwrap();"},{"Add":" debug!(\"changed: {:?}\", is_leader.borrow());"},{"Add":" if !*is_leader.borrow() {"},{"Add":" info!(\"Lock released\");"},{"Add":" // at.store(false, Ordering::SeqCst);"},{"Add":" t.await.unwrap();"},{"Add":" client"},{"Add":" .resign(Some(etcd_client::ResignOptions::new().with_leader(leader)))"},{"Add":" .await?;"},{"Add":" break;"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"async fn observe_elections("},{"Add":" host: String,"},{"Add":" signal: String,"},{"Add":" password: String,"},{"Add":" lead: Arc>,"},{"Add":" pool: Arc>,"},{"Add":") -> Result<(), anyhow::Error> {"},{"Add":" let mut client = Client::connect([\"localhost:2379\"], None).await?;"},{"Add":" let mut obs = client.observe(\"postrep\").await?;"},{"Add":" while let Some(m) = obs.message().await? {"},{"Add":" debug!(\"obs: {:?}\", m);"},{"Add":" let leader = m.kv().unwrap().value_str()?;"},{"Add":" if leader != host {"},{"Add":" info!(\"The leader is {:?}\", leader);"},{"Add":" std::fs::write(&signal, \"\").unwrap_or(());"},{"Add":" lead.send(false).unwrap();"},{"Add":" } else {"},{"Add":" info!(\"I'm the leader\");"},{"Add":" std::fs::remove_file(&signal).unwrap_or(());"},{"Add":" lead.send(true).unwrap();"},{"Add":" }"},{"Add":" let pool = pool.lock().await;"},{"Add":" pool.execute(format!(\"ALTER SYSTEM SET primary_conninfo='host={} port=5432 user=replication password={}'\", leader, password).as_str(), &[]).await?;"},{"Add":" }"},{"Add":" Ok(())"},{"Add":"}"}]}},{"FileAdd":{"meta":{"basename":"default.nix","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"with import {};"},{"Add":"clangStdenv.mkDerivation rec {"},{"Add":" name = \"nest-env\";"},{"Add":" PROTOC=\"${protobuf}/bin/protoc\";"},{"Add":"}"}]}},{"FileAdd":{"meta":{"basename":"README.md","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"## Postrep, a basic PostgreSQL custering tool"},{"Add":""},{"Add":"Postrep uses a fixed replication strategy (streaming replication), a fixed leader election tool (Etcd 3), to achieve proper failover when the cluster leader fails."}]}},{"FileAdd":{"meta":{"basename":"Cargo.toml","metadata":0},"context":[{"change":1,"pos":0}],"contents":[{"Add":"[package]"},{"Add":"name = \"postrep\""},{"Add":"version = \"0.1.0\""},{"Add":"authors = [\"Pierre-Étienne Meunier \"]"},{"Add":"edition = 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