Simple Architecture

docs/diagrams/hb_failure_evict.puml

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+@startuml hb_failure_evict
+title HeartbeatFailure → evictPeer → TriggerConsensus ou DHT replenish
+
+participant "Node A" as NodeA
+participant "Indexer X\n(défaillant)" as IX
+participant "Indexer Y\n(voter)" as IY
+participant "Indexer Z\n(voter)" as IZ
+participant "DHT" as DHT
+participant "Indexer NEW\n(candidat)" as INEW
+
+note over NodeA: SendHeartbeat tick — Indexer X dans le pool
+
+NodeA -> IX: stream.Encode(Heartbeat{...})
+IX -->x NodeA: timeout / transport error
+
+NodeA -> NodeA: HeartbeatFailure(h, proto, dir, addr_X, info_X, isIndexerHB=true, maxPool)
+
+NodeA -> NodeA: evictPeer(dir, addr_X, id_X, proto)\n→ Streams.Delete(proto, &id_X)\n→ DeleteAddr(addr_X)\n→ DeleteScore(addr_X)\n→ voters = remaining AddrInfos
+
+NodeA -> NodeA: poolSize = len(dir.GetAddrs())
+
+alt poolSize == 0
+    NodeA -> NodeA: reconnectToSeeds()\n→ réinjecte IndexerAddresses (IsSeed=true)
+    alt seeds ajoutés
+        NodeA -> NodeA: need = maxPool\nNudgeIt() → tick immédiat
+    else aucun seed configuré ou seeds injoignables
+        NodeA -> NodeA: go retryUntilSeedResponds()\n(backoff 10s→5min, panic si IndexerAddresses vide)
+    end
+else poolSize > 0 AND len(voters) > 0
+    NodeA -> NodeA: go TriggerConsensus(h, voters, need)
+    NodeA -> IY: stream GET → GetValue{Key: candidate_DID}
+    IY --> NodeA: GetResponse{Found, Records}
+    NodeA -> IZ: stream GET → GetValue{Key: candidate_DID}
+    IZ --> NodeA: GetResponse{Found, Records}
+    note over NodeA: Quorum check:\nfound=true AND lastSeen ≤ 2×interval\nAND lastScore ≥ 30\n→ majorité → admission INEW
+    NodeA -> NodeA: Indexers.SetAddr(addr_NEW, &INEW_AddrInfo)\nIndexers.SetScore(addr_NEW, Score{IsSeed:false})\nNudgeIt()
+else poolSize > 0 AND len(voters) == 0
+    NodeA -> DHT: go replenishIndexersFromDHT(h, need)\nDiscoverIndexersFromDHT → SelectByFillRate\n→ add to Indexers Directory
+end
+
+@enduml