Campaign method blocks

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I have three nodes that compete for leadership.
Each node starts by calling the campaign method. When all nodes work in parallel, one of them acquires leadership, and so other nodes are blocked by the campaign method.

These follower nodes are effectively stuck until the leader either resigns or fails and hence follower nodes cannot continue.

Does anyone have any idea how to implement it?
How are nodes notified when the lease expired? I have checked etcd key/values when the campaign is called, and noticed that each node generates different keys. So it is impossible to know what key to watch.

[ahrtr]

You might want to refer to links below,

• https://github.com/etcd-io/etcd/blob/main/client/v3/concurrency/election.go
• https://github.com/etcd-io/etcd/blob/main/client/v3/concurrency/example_election_test.go

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@ahrtr Thank you for reply. Yeah, I examined those files, though it didn't help me much. Nevertheless I have found a solution.
If you could have a look and leave your feedback I'd be very glad.

Warning: It is in Rust, not in Golang. :-)