No multiaddrs returned from provider record lookups

[aschmahmann]

Background

Provider record look ups sometimes return no multiaddrs for providers even though those peers are routable and their addresses can be resolved in a subsequent peer lookup (either with an HTTP call to /v1/peer/PeerID or using Kubo)

Root cause

• Peer maddrs are stored with a 15 minute TTL by default https://github.com/libp2p/go-libp2p/blob/cd88f9784044da5466534713a23d61d874774a53/core/peerstore/peerstore.go#L29-L31
• DHT Servers for a given provider record will keep the peer maddrs for 24 hours https://github.com/libp2p/go-libp2p-kad-dht/blob/398987531298d7dd6797b83a2e6737e746567d2e/providers/providers_manager.go#L255

Possible directions for solution

• Add an additional find_peer call for providers with no maddrs
• Implement Add active peer probing and reputation caching #53

Related issues:

• No multiaddrs returned from provider record lookups ipni/caskadht#9
• Support DHT-based Peer routing over HTTP #14
• Add active peer probing and reputation caching #53