Substrate authority discovery.
This crate enables Substrate authorities to directly connect to other authorities.
[AuthorityDiscovery] implements the Future trait. By polling [AuthorityDiscovery] an
authority:
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Makes itself discoverable
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Retrieves its external addresses (including peer id) or the ones of its sentry nodes.
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Signs the above.
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Puts the signature and the addresses on the libp2p Kademlia DHT.
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Discovers other authorities
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Retrieves the current set of authorities.
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Starts DHT queries for the ids of the authorities.
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Validates the signatures of the retrieved key value pairs.
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Adds the retrieved external addresses as priority nodes to the peerset.
When run as a sentry node, the authority discovery module does not publish any addresses to the DHT but still discovers validators and sentry nodes of validators, i.e. only step 2 (Discovers other authorities) is executed.