raft_lite

Types

ElectionResult

A tiny “raft-lite” helper. This is a lightweight, deterministic leader selection module built on top of membership. It does not implement full Raft semantics (log replication, terms, safety), but provides a small and well-tested way to elect a leader among alive nodes. It is useful as a pragmatic default and as a base for a future full Raft implementation.

pub type ElectionResult {
  Leader(String)
  NoLeader
}

Constructors

```
Leader(String)
```
```
NoLeader
```

Values

am_i_leader

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pub fn am_i_leader() -> Bool

Check if this node is currently the leader.

current_leader

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pub fn current_leader() -> option.Option(String)

Convenience: return the current leader as Option(String).

current_term

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pub fn current_term() -> Int

Get the current election term.

elect

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pub fn elect() -> ElectionResult

Elect a leader from the current alive members. The election rule is deterministic: choose the lexicographically largest node returned by membership.alive(). Returns NoLeader when there are no alive nodes.

get_raft_leader

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pub fn get_raft_leader() -> option.Option(String)

Get the current leader from the Raft service. Returns the leader node name, or empty string if no leader.

request_vote

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pub fn request_vote(term: Int, candidate: String) -> Bool

Request a vote from a peer for the given term and candidate. Returns True if the vote was granted.

send_heartbeat

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pub fn send_heartbeat(leader: String) -> Nil

Send a heartbeat as leader to maintain leadership.

start_election

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pub fn start_election() -> Nil

Trigger a new election. The node will become a candidate and request votes.

start_service

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pub fn start_service() -> Nil

Start the Raft-lite election service. This spawns a background process that handles election timeouts and heartbeats.

stop_service

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pub fn stop_service() -> Nil

Stop the Raft-lite election service.