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81daaacae9
Follow-up from #5947, branched off of #5954. This simplifies the upgrade logic by adding explicit eviction requests, which can also be useful for other use-cases (e.g. if we need to ban a peer that's misbehaving). Changes: * Add `evict` map which queues up peers to explicitly evict. * `upgrading` now only tracks peers that we're upgrading via dialing (`DialNext` → `Dialed`/`DialFailed`). * `Dialed` will unmark `upgrading`, and queue `evict` if still beyond capacity. * `Accepted` will pick a random lower-scored peer to upgrade to, if appropriate, and doesn't care about `upgrading` (the dial will fail later, since it's already connected). * `EvictNext` will return a peer scheduled in `evict` if any, otherwise if beyond capacity just evict the lowest-scored peer. This limits all of the `upgrading` logic to `DialNext`, `Dialed`, and `DialFailed`, making it much simplier, and it should generally do the right thing in all cases I can think of.
p2p
The p2p package provides an abstraction around peer-to-peer communication.
Docs:
- Connection for details on how connections and multiplexing work
- Peer for details on peer ID, handshakes, and peer exchange
- Node for details about different types of nodes and how they should work
- Pex for details on peer discovery and exchange
- Config for details on some config option