How to make dht reconnect after network fault

[avbasov]

I have a problem with a DHT peer. It stops working after network faults.

1. I connect a peer from my laptop to a p2p network on Digital Ocean droplet. And it works perfectly fine.
2. Then I turn off WiFi on the laptop and wait for a bootstrap error dht: error bootstrapping: failed to find any peer in table.
3. I turn WiFi on, but the peer doesn't reconnect to the p2p network and keeps writing the same error about empty peer table.

Could you, please, tell me what the proper way to restore connectivity is?

Here is a simplified code

ctx := context.Background()
ipfsLogLevel, _ := logging.LogLevel("DEBUG")
ipfsLog.SetAllLoggers(ipfsLogLevel)

host, _ := libp2p.New(ctx)
dht, _ := kadDHT.New(ctx, host)

host.Connect(ctx, seedPeer)
dht.BootstrapOnce(ctx, kadDHT.DefaultBootstrapConfig)

cfg := kadDHT.DefaultBootstrapConfig
cfg.Period = 30 * time.Second
dht.BootstrapWithConfig(ctx, cfg)

<-ctx.Done()

[raulk]

@anacrolix is the best person to dig into this.

[anacrolix]

Hi @avbasov . #254 and #283 are related to this. In the meanwhile, you'll have to manually reconnect to the seed peers. You might do this periodically, or when network conditions change, or when you get failed to find any peer in table errors. In https://github.com/libp2p/go-libp2p-kad-dht/issues/254#issuecomment-468105273, I mention fallback nodes, I think this issue is sufficient to prompt a stand-alone issue for that feature.

[anacrolix]

I've proposed the fix in #295. I'll leave this issue open for a while for any questions you have about workarounds.

[avbasov]

@anacrolix Thanks for the answer. The reconnection works.

[anacrolix]

Cheers.