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2
Cargo.lock
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Cargo.lock
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@ -645,7 +645,7 @@ dependencies = [
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[[package]]
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[[package]]
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name = "noleader"
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name = "noleader"
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version = "0.1.1"
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version = "0.1.2"
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dependencies = [
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dependencies = [
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"anyhow",
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"anyhow",
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"async-nats",
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"async-nats",
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29
README.md
29
README.md
@ -22,9 +22,9 @@ This library is still young and the API is subject to change.
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## Intended use-case
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## Intended use-case
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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.
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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.
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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.
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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.
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Good alternatives are:
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Good alternatives are:
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@ -97,29 +97,14 @@ async fn main() -> anyhow::Result<()> {
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}
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}
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```
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```
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## API Overview
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## Examples
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* **`Leader::new(bucket: &str, key: &str, client: async_nats::Client) -> Leader`**
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See the examples folder in ./crates/noleader/examples
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Create a new election participant.
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* **`create_bucket(&self) -> anyhow::Result<()>`**
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Ensures the KV bucket exists (no-op if already created).
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* **`start(&self, token: CancellationToken) -> anyhow::Result<()>`**
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Begins the background leader-election loop; renews TTL on success or retries on failure.
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* **`do_while_leader<F, Fut>(&self, f: F) -> anyhow::Result<()>`**
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Runs your closure as long as you hold leadership; cancels immediately on loss.
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* **`leader_id(&self) -> Uuid`**
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Returns your unique candidate ID.
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* **`is_leader(&self) -> Status`**
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Returns `Status::Leader` or `Status::Candidate`, taking shutdown into account.
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### Types
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## Architecture
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Noleader uses a simple election stealing
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```rust
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pub enum Status {
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Leader,
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Candidate,
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}
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```
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## License
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## License
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