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Author SHA1 Message Date
cuddle-please
eda50d290a chore(release): 0.1.2
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2025-07-04 11:22:55 +00:00
5 changed files with 45 additions and 41 deletions

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@@ -6,20 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased] ## [Unreleased]
## [0.1.3] - 2025-07-06
### Added
- do publish
- allow readme
## [0.1.2] - 2025-07-04 ## [0.1.2] - 2025-07-04
### Added ### Added
- update basic example with a more simple acquire and run function - update basic example with a more simple acquire and run function
### Docs
- update master
## [0.1.1] - 2025-07-04 ## [0.1.1] - 2025-07-04
### Added ### Added

2
Cargo.lock generated
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@@ -645,7 +645,7 @@ dependencies = [
[[package]] [[package]]
name = "noleader" name = "noleader"
version = "0.1.2" version = "0.1.0"
dependencies = [ dependencies = [
"anyhow", "anyhow",
"async-nats", "async-nats",

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@@ -3,7 +3,7 @@ members = ["crates/*"]
resolver = "2" resolver = "2"
[workspace.package] [workspace.package]
version = "0.1.3" version = "0.1.2"
license = "MIT" license = "MIT"
[workspace.dependencies] [workspace.dependencies]

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@@ -22,9 +22,9 @@ This library is still young and the API is subject to change.
## Intended use-case ## Intended use-case
Noleader is not built for distributed consensus, or fast re-election procedures. It take upwards to a minute to get re-elected, state is the users responsibility to handle. Noleader is not built for distributed consensus, or fast re-election produces. It take upwards to a minute to get reelected, state is the users responsibility to handle.
Noleader is pretty much just a distributed lock, intended for use-cases where the user wants to only have a single node scheduling work etc. Noleader is pretty much just a distributed lock, intended for use-cases where the use wants to only have a single node scheduling work etc.
Good alternatives are: Good alternatives are:
@@ -71,40 +71,58 @@ async fn main() -> anyhow::Result<()> {
// Ensure the KV bucket exists // Ensure the KV bucket exists
leader.create_bucket().await?; leader.create_bucket().await?;
// Attempts to acquire election loop, will call inner function if it wins, if it loses it will retry over again. // Spawn the election loop
// Will block until either the inner function returns and error, or the election processes crashes, intended to allow the application to properly restart tokio::spawn({
leader let leader = leader.clone();
.acquire_and_run({
move |token| {
let leader_id = leader_id.clone();
async move { async move {
loop { leader
if token.is_cancelled() { .start(CancellationToken::default())
return Ok(()); .await
.expect("leadership loop failed");
} }
});
tracing::info!(leader_id, "do work as leader"); // Do work while we are the leader
leader
.do_while_leader(|cancel_token| async move {
loop {
if cancel_token.is_cancelled() {
break;
}
tracing::info!("🔑 I am the leader—doing work");
tokio::time::sleep(std::time::Duration::from_secs(1)).await; tokio::time::sleep(std::time::Duration::from_secs(1)).await;
} }
} Ok(())
}
}) })
.await?; .await?;
Ok(()) Ok(())
} }
``` ```
## Examples ## API Overview
See the examples folder in ./crates/noleader/examples * **`Leader::new(bucket: &str, key: &str, client: async_nats::Client) -> Leader`**
Create a new election participant.
* **`create_bucket(&self) -> anyhow::Result<()>`**
Ensures the KV bucket exists (no-op if already created).
* **`start(&self, token: CancellationToken) -> anyhow::Result<()>`**
Begins the background leader-election loop; renews TTL on success or retries on failure.
* **`do_while_leader<F, Fut>(&self, f: F) -> anyhow::Result<()>`**
Runs your closure as long as you hold leadership; cancels immediately on loss.
* **`leader_id(&self) -> Uuid`**
Returns your unique candidate ID.
* **`is_leader(&self) -> Status`**
Returns `Status::Leader` or `Status::Candidate`, taking shutdown into account.
## Architecture ### Types
Noleader uses a simple election stealing
```rust
pub enum Status {
Leader,
Candidate,
}
```
## License ## License

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@@ -1,12 +1,7 @@
[package] [package]
name = "noleader" name = "noleader"
edition = "2024" version = "0.1.0"
readme = "../../README.md" edition = "2021"
version.workspace = true
license.workspace = true
repository = "https://git.front.kjuulh.io/kjuulh/noleader"
authors = ["kjuulh <contact@kasperhermansen.com>"]
description = "A small leader election package using NATS keyvalue store as the distributed locking mechanism. Does not require a min / max set of nodes"
[dependencies] [dependencies]
anyhow.workspace = true anyhow.workspace = true