Remove local providers (#268)

* add remove provider method

* remove failed providers

* bumping dht to latest master

codex/blockexchange/engine/discovery.nim

@@ -152,8 +152,14 @@ proc discoveryTaskLoop(b: DiscoveryEngine) {.async.} =
             peers = await request
 
           trace "Discovered peers", peers = peers.len
-          checkFutures(
-            await allFinished(peers.mapIt( b.network.dialPeer(it.data))))
+          let
+            dialed = await allFinished(
+              peers.mapIt( b.network.dialPeer(it.data) ))
+
+          for i, f in dialed:
+            if f.failed:
+              await b.discovery.removeProvider(peers[i].data.peerId)
+
         finally:
           b.inFlightDiscReqs.del(cid)
           codex_inflight_discovery.set(b.inFlightAdvReqs.len.int64)

codex/discovery.nim

@@ -137,6 +137,13 @@ method provide*(d: Discovery, host: ca.Address) {.async, base.} =
   if nodes.len > 0:
     trace "Provided to nodes", nodes = nodes.len
 
+method removeProvider*(d: Discovery, peerId: PeerId): Future[void] =
+  ## Remove provider from providers table
+  ##
+
+  trace "Removing provider", peerId
+  d.protocol.removeProvidersLocal(peerId)
+
 proc start*(d: Discovery) {.async.} =
   d.protocol.updateRecord(
     d.localInfo.signedPeerRecord.some)

vendor/nim-libp2p-dht

@@ -1 +1 @@
-Subproject commit 4b9fa0356e6cefbbbcedcf21a914cda575229774
+Subproject commit 08928e57d82736ab9524010a3bd59a707f2e0769