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"1.0.71" } +tokio = { version = "1", features = ["full"] } +tracing = { version = "0.1", features = ["log"] } diff --git a/crates/noleader/Cargo.toml b/crates/noleader/Cargo.toml new file mode 100644 index 0000000..3f45908 --- /dev/null +++ b/crates/noleader/Cargo.toml @@ -0,0 +1,18 @@ +[package] +name = "noleader" +version = "0.1.0" +edition = "2021" + +[dependencies] +anyhow.workspace = true +tracing.workspace = true + +async-nats = "0.42" +uuid = { version = "1", features = ["v4"] } +bytes = "1" +tokio.workspace = true +tokio-util = "0.7" +rand = "0.9.1" + +[dev-dependencies] +tracing-subscriber = { version = "0.3", features = ["env-filter"] } diff --git a/crates/noleader/examples/basic/main.rs b/crates/noleader/examples/basic/main.rs new file mode 100644 index 0000000..6baacb5 --- /dev/null +++ b/crates/noleader/examples/basic/main.rs @@ -0,0 +1,53 @@ +use tokio_util::sync::CancellationToken; +use tracing_subscriber::EnvFilter; + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + // Set up logger + tracing_subscriber::fmt() + .with_env_filter( + EnvFilter::from_default_env() + .add_directive("noleader=debug".parse().unwrap()) + .add_directive("lots_of_candidates=debug".parse().unwrap()) + .add_directive("info".parse().unwrap()), + ) + .init(); + + let mybucket = "mytestbucket"; + let mykey = "myleaderkey"; + let client = async_nats::connect("localhost:4222").await?; + + let leader = noleader::Leader::new(mybucket, mykey, client); + let leader_id = leader.leader_id().await.to_string(); + + tracing::info!("creating bucket"); + leader.create_bucket().await?; + + tokio::spawn({ + let leader = leader.clone(); + let leader_id = leader_id.clone(); + + async move { + tracing::debug!(leader_id, "starting leader"); + leader + .start(CancellationToken::default()) + .await + .expect("to succeed"); + } + }); + + leader + .do_while_leader(move |token| async move { + loop { + if token.is_cancelled() { + return Ok(()); + } + + tracing::info!("do work as leader"); + tokio::time::sleep(std::time::Duration::from_secs(1)).await; + } + }) + .await?; + + Ok(()) +} diff --git a/crates/noleader/examples/lots_of_candidates/main.rs b/crates/noleader/examples/lots_of_candidates/main.rs new file mode 100644 index 0000000..95f3feb --- /dev/null +++ b/crates/noleader/examples/lots_of_candidates/main.rs @@ -0,0 +1,69 @@ +use tokio_util::sync::CancellationToken; +use tracing_subscriber::EnvFilter; + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + // Set up logger + tracing_subscriber::fmt() + .with_env_filter( + EnvFilter::from_default_env() + .add_directive("noleader=debug".parse().unwrap()) + .add_directive("lots_of_candidates=debug".parse().unwrap()) + .add_directive("info".parse().unwrap()), + ) + .init(); + + let mybucket = "mytestbucket"; + let mykey = "myleaderkey"; + let client = async_nats::connect("localhost:4222").await?; + + let mut handles = Vec::new(); + + for _ in 0..100 { + let client = client.clone(); + + let handle = tokio::spawn(async move { + let leader = noleader::Leader::new(mybucket, mykey, client); + let leader_id = leader.leader_id().await.to_string(); + + tracing::info!("creating bucket"); + leader.create_bucket().await?; + + tokio::spawn({ + let leader = leader.clone(); + let leader_id = leader_id.clone(); + + async move { + tracing::debug!(leader_id, "starting leader"); + leader + .start(CancellationToken::default()) + .await + .expect("to succeed"); + } + }); + + loop { + tokio::time::sleep(std::time::Duration::from_millis(10000)).await; + match leader.is_leader().await { + noleader::Status::Leader => { + tracing::info!(leader_id, "is leader"); + } + noleader::Status::Candidate => { + //tracing::debug!("is candiate"); + } + } + } + + #[allow(unreachable_code)] + Ok::<(), anyhow::Error>(()) + }); + + handles.push(handle); + } + + for handle in handles { + handle.await??; + } + + Ok(()) +} diff --git a/crates/noleader/src/lib.rs b/crates/noleader/src/lib.rs new file mode 100644 index 0000000..4f761fd --- /dev/null +++ b/crates/noleader/src/lib.rs @@ -0,0 +1,360 @@ +use std::{ + future::Future, + sync::{ + atomic::{AtomicBool, Ordering}, + Arc, + }, + time::Duration, +}; + +use anyhow::Context; +use async_nats::jetstream::kv; +use rand::Rng; +use tokio::sync::RwLock; +use tokio_util::sync::CancellationToken; +use uuid::Uuid; + +#[derive(Clone)] +pub struct Leader { + shutting_down: Arc, + is_leader: Arc, + inner: Arc>, +} +const DEFAULT_INTERVAL: Duration = std::time::Duration::from_secs(10); + +impl Leader { + pub fn new(bucket: &str, key: &str, client: async_nats::Client) -> Self { + Self { + shutting_down: Arc::new(AtomicBool::new(false)), + is_leader: Arc::new(AtomicBool::new(false)), + inner: Arc::new(RwLock::new(InnerLeader::new(bucket, key, client))), + } + } + + pub async fn do_while_leader(&self, f: F) -> anyhow::Result<()> + where + F: Fn(CancellationToken) -> Fut, + Fut: Future> + Send + 'static, + { + loop { + let is_leader = self.is_leader.clone(); + if !is_leader.load(Ordering::Relaxed) { + tokio::time::sleep(Duration::from_secs(1)).await; + continue; + } + + let cancellation_token = CancellationToken::new(); + let child_token = cancellation_token.child_token(); + + let guard = tokio::spawn(async move { + loop { + tokio::time::sleep(std::time::Duration::from_millis(100)).await; + + if !is_leader.load(Ordering::Relaxed) { + cancellation_token.cancel(); + } + } + }); + + let res = f(child_token).await; + guard.abort(); + res?; + } + } + + pub async fn leader_id(&self) -> Uuid { + let inner = self.inner.read().await; + inner.id + } + + pub async fn create_bucket(&self) -> anyhow::Result<()> { + let mut inner = self.inner.write().await; + tracing::info!("creating bucket leadership bucket"); + + inner.create_bucket().await?; + + Ok(()) + } + + pub async fn start(&self, cancellation_token: CancellationToken) -> anyhow::Result<()> { + let mut attempts = 1; + + // Initial attempt + let _ = self.try_become_leader().await; + + loop { + let wait_factor = { + let mut rng = rand::rng(); + rng.random_range(0.001..1.000) + }; + + let sleep_fut = tokio::time::sleep((DEFAULT_INTERVAL * attempts).mul_f64(wait_factor)); + + tokio::select! { + _ = sleep_fut => {}, + _ = cancellation_token.cancelled() => { + self.shutting_down.store(true, std::sync::atomic::Ordering::Relaxed); // Ordering can be relaxed, because our operation is an atomic update + return Ok(()) + } + }; + + match self.try_become_leader().await { + Ok(_) => { + self.is_leader + .store(true, std::sync::atomic::Ordering::Relaxed); + attempts = 1; + } + Err(e) => { + tracing::debug!(error = e.to_string(), "failed to become leader"); + self.is_leader.store(false, Ordering::Relaxed); + if attempts <= 10 { + attempts += 1; + } + } + } + } + } + + async fn try_become_leader(&self) -> anyhow::Result<()> { + let mut inner = self.inner.write().await; + match inner.start().await { + Ok(_) => Ok(()), + Err(e) => { + tracing::trace!("failed to update leadership status: {:#?}", e); + anyhow::bail!("{}", e); + } + } + } + + pub async fn is_leader(&self) -> Status { + if self + .shutting_down + .load(std::sync::atomic::Ordering::Relaxed) + { + return Status::Candidate; + } + + if self.is_leader.load(Ordering::Relaxed) { + Status::Leader + } else { + Status::Candidate + } + } +} + +pub enum Status { + Leader, + Candidate, +} + +struct InnerLeader { + state: LeaderState, + + bucket: String, + key: String, + + id: uuid::Uuid, + revision: u64, + + client: async_nats::jetstream::Context, +} + +#[derive(Default, Clone)] +enum LeaderState { + #[default] + Unknown, + Leader, + Campaigning, +} + +impl InnerLeader { + pub fn new(bucket: &str, key: &str, client: async_nats::Client) -> Self { + Self { + bucket: bucket.into(), + key: key.into(), + + id: uuid::Uuid::new_v4(), + revision: u64::MIN, + + state: LeaderState::Unknown, + client: async_nats::jetstream::new(client), + } + } + + pub async fn create_bucket(&mut self) -> anyhow::Result<()> { + if (self.client.get_key_value(&self.bucket).await).is_ok() { + return Ok(()); + } + + if let Err(e) = self + .client + .create_key_value(kv::Config { + bucket: self.bucket.clone(), + description: "leadership bucket for noleader".into(), + limit_markers: Some(std::time::Duration::from_secs(60)), + max_age: std::time::Duration::from_secs(60), + ..Default::default() + }) + .await + { + tracing::info!( + "bucket creation failed, it might have just been a conflict, testing again: {e}" + ); + + if (self.client.get_key_value(&self.bucket).await).is_ok() { + return Ok(()); + } + + anyhow::bail!("failed to create bucket: {}", e) + } + + Ok(()) + } + + /// start, will run a blocking operation for becoming the next leader. + pub async fn start(&mut self) -> anyhow::Result<()> { + // Attempt to grab leadership, + // If leader, do updates as long as their key is the value + + match self.state { + LeaderState::Unknown => { + tracing::debug!("state is unknown, trying to become leader"); + // start campaigning + self.state = LeaderState::Campaigning; + + self.try_for_leadership().await?; + } + + LeaderState::Campaigning => { + tracing::debug!("campaigning for leadership"); + + self.try_for_leadership().await?; + } + LeaderState::Leader => { + tracing::debug!("updating leadership"); + // maintain leadership + match self.update_leadership().await { + Ok(_) => {} + Err(e) => { + self.state = LeaderState::Unknown; + anyhow::bail!("failed to update leadership: {}", e); + } + } + + return Ok(()); + } + } + + Ok(()) + } + + async fn update_leadership(&mut self) -> anyhow::Result<()> { + let bucket = self.client.get_key_value(&self.bucket).await?; + + let Some(val) = bucket.get(&self.key).await? else { + anyhow::bail!("key doesn't exists, we've lost leadership status") + }; + + let Ok(id) = uuid::Uuid::from_slice(&val) else { + anyhow::bail!("value has changed, it is no longer a uuid, dropping leadership status"); + }; + + if id != self.id { + anyhow::bail!("leadership has changed") + } + + let rev = bucket + .update( + &self.key, + bytes::Bytes::copy_from_slice(self.id.as_bytes()), + self.revision, + ) + .await?; + + self.revision = rev; + + Ok(()) + } + + async fn try_for_leadership(&mut self) -> anyhow::Result<()> { + let bucket = self + .client + .get_key_value(&self.bucket) + .await + .context("failed to get bucket")?; + + let rev = match bucket + .create_with_ttl( + &self.key, + bytes::Bytes::copy_from_slice(self.id.as_bytes()), + std::time::Duration::from_secs(60), + ) + .await + { + Ok(rev) => rev, + Err(e) => match e.kind() { + kv::CreateErrorKind::AlreadyExists => { + anyhow::bail!("another candidate has leadership status") + } + _ => { + anyhow::bail!("{}", e); + } + }, + }; + + self.revision = rev; + + tokio::time::sleep(DEFAULT_INTERVAL).await; + + tracing::info!("acquired leadership status"); + + let leadership_state = self.leadership_status().await?; + + if !leadership_state.is_leader(&self.id) { + anyhow::bail!("failed to become leader, there is likely some churn going on"); + } + + // We're a leader + self.state = LeaderState::Leader; + + Ok(()) + } + + async fn leadership_status(&mut self) -> anyhow::Result { + let bucket = self.client.get_key_value(&self.bucket).await?; + + let val = bucket.get(&self.key).await?; + + Ok(match val { + Some(content) => { + let id = match uuid::Uuid::from_slice(&content) { + Ok(u) => u, + Err(e) => { + tracing::warn!( + "leadership state is not a valid UUID, ignoring the value: {}", + e + ); + return Ok(LeadershipState::NotFound); + } + }; + + LeadershipState::Allocated { id } + } + None => LeadershipState::NotFound, + }) + } +} + +enum LeadershipState { + NotFound, + Allocated { id: uuid::Uuid }, +} + +impl LeadershipState { + pub fn is_leader(&self, leader_id: &Uuid) -> bool { + match self { + LeadershipState::Allocated { id } => id == leader_id, + _ => false, + } + } +} diff --git a/cuddle.yaml b/cuddle.yaml new file mode 100644 index 0000000..3255bed --- /dev/null +++ b/cuddle.yaml @@ -0,0 +1,17 @@ +# yaml-language-server: $schema=https://git.front.kjuulh.io/kjuulh/cuddle/raw/branch/main/schemas/base.json + +base: "git@git.front.kjuulh.io:kjuulh/cuddle-rust-lib-plan.git" + +vars: + service: "noleader" + registry: kasperhermansen + +please: + project: + owner: kjuulh + repository: "noleader" + branch: main + settings: + api_url: "https://git.front.kjuulh.io" + actions: + rust: diff --git a/templates/docker/docker-compose.yml b/templates/docker/docker-compose.yml new file mode 100644 index 0000000..3c29f03 --- /dev/null +++ b/templates/docker/docker-compose.yml @@ -0,0 +1,9 @@ +services: + nats: + image: nats:2.11-alpine + command: + - "--jetstream" + ports: + - "4222:4222" # Client connections + - "8222:8222" # HTTP monitoring + - "6222:6222" # Clustering