@startuml indexer_heartbeat
title Indexer — Heartbeat node → indexer (score on 5 metrics)

participant "Node A" as NodeA
participant "Node B" as NodeB
participant "IndexerService" as Indexer

note over NodeA,NodeB: Every node tick every 20s (SendHeartbeat)

par Node A heartbeat
    NodeA -> Indexer: NewStream /opencloud/heartbeat/1.0
    NodeA -> Indexer: stream.Encode(Heartbeat{Name, PeerID_A, IndexersBinded, Record})

    Indexer -> Indexer: CheckHeartbeat(host, stream, dec, streams, mu, maxNodes)
    note over Indexer: len(h.Network().Peers()) >= maxNodes → reject

    Indexer -> Indexer: getBandwidthChallengeRate(host, remotePeer, 512-2048B)

    Indexer -> Indexer: getOwnDiversityRate(host)\\nh.Network().Peers() + Peerstore.Addrs()\\n→ ratio /24 subnets distincts

    Indexer -> Indexer: fillRate = len(h.Network().Peers()) / maxNodes

    Indexer -> Indexer: Retrieve existing UptimeTracker\\noldTracker.RecordHeartbeat()\\n→ TotalOnline += gap si gap ≤ 120s\\nuptimeRatio = TotalOnline / time.Since(FirstSeen)

    Indexer -> Indexer: ComputeIndexerScore(\\n  uptimeRatio, bpms, diversity,\\n  latencyScore, fillRate\\n)\\nScore = (0.20×U + 0.20×B + 0.20×D + 0.15×L + 0.25×F) × 100

    Indexer -> Indexer: dynamicMinScore(age)\\n= 20 + 60×(hours/24), max 80

    alt Score A < dynamicMinScore(age)
        Indexer -> NodeA: (close stream — "not enough trusting value")
    else Score A >= dynamicMinScore(age)
        Indexer -> Indexer: streams[PeerID_A].HeartbeatStream = hb.Stream\\nstreams[PeerID_A].HeartbeatStream.UptimeTracker = oldTracker\\nstreams[PeerID_A].LastScore = hb.Score
        note over Indexer: AfterHeartbeat → republish PeerRecord on DHT
    end

else Node B heartbeat
    NodeB -> Indexer: NewStream /opencloud/heartbeat/1.0
    NodeB -> Indexer: stream.Encode(Heartbeat{Name, PeerID_B, IndexersBinded, Record})

    Indexer -> Indexer: CheckHeartbeat → getBandwidthChallengeRate\\n→ getOwnDiversityRate → ComputeIndexerScore(5 composants)

    alt Score B >= dynamicMinScore(age)
        Indexer -> Indexer: streams[PeerID_B] subscribed + LastScore updated
    end
end par

note over Indexer: GC ticker 30s — gc()\\nnow.After(Expiry) où Expiry = lastHBTime + 2min\\n→ AfterDelete(pid, name, did)

@enduml