Simple Architecture

docs/diagrams/hb_last_indexer.puml

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+@startuml hb_last_indexer
+title Protection last-indexer → reconnectToSeeds → retryUntilSeedResponds
+
+participant "Node A" as NodeA
+participant "Indexer LAST\n(seul restant)" as IL
+participant "Seed Indexer\n(config)" as SEED
+participant "DHT" as DHT
+
+note over NodeA: Pool = 1 indexeur (LAST)\nIsSeed=false, score bas depuis longtemps
+
+== Tentative d'éviction par score ==
+NodeA -> NodeA: score < minScore\nAND TotalOnline ≥ 2×interval\nAND !IsSeed\nAND len(pool) > 1 ← FAUX : pool == 1
+
+note over NodeA: Garde active : len(pool) == 1\n→ éviction par score BLOQUÉE\nLAST reste dans le pool
+
+== Panne réseau (heartbeat fail) ==
+NodeA -> IL: stream.Encode(Heartbeat{...})
+IL -->x NodeA: timeout
+
+NodeA -> NodeA: HeartbeatFailure → evictPeer(LAST)\npoolSize = 0
+
+NodeA -> NodeA: reconnectToSeeds()\n→ parse IndexerAddresses (conf)\n→ SetAddr + SetScore(IsSeed=true) pour chaque seed
+
+alt seeds ajoutés (IndexerAddresses non vide)
+    NodeA -> NodeA: NudgeIt() → tick immédiat
+    NodeA -> SEED: Heartbeat{...} (via SendHeartbeat nudge)
+    SEED --> NodeA: HeartbeatResponse{fillRate, ...}
+    note over NodeA: Pool rétabli via seeds.\nDHT proactive discovery reprend.
+
+else IndexerAddresses vide
+    NodeA -> NodeA: go retryUntilSeedResponds()
+    note over NodeA: panic immédiat :\n"pool is empty and no seed indexers configured"\n→ arrêt du processus
+end
+
+== retryUntilSeedResponds (si seeds non répondants) ==
+loop backoff exponentiel (10s → 20s → ... → 5min)
+    NodeA -> NodeA: time.Sleep(backoff)
+    NodeA -> NodeA: len(Indexers.GetAddrs()) > 0?\n→ oui : retour (quelqu'un a refillé)
+    NodeA -> NodeA: reconnectToSeeds()
+    alt pool > 0 après reconnect
+        NodeA -> NodeA: NudgeIt()\nDHT.Bootstrap(ctx, 15s)
+        note over NodeA: Sortie de la boucle.\nHeartbeat normal reprend.
+    end
+end
+
+@enduml