go/logging: libp2p log adapter

[ptrus]

Fixes: #4531

libp2p logs are now emitted through oasis-node logging system.

Example logs:

{"caller":"id.go:453","level":"debug","module":"libp2p:net/identify","msg":"/ipfs/id/1.0.0 received message from 12D3KooWCUm3BxCXj5UTfkhbRnxb7hicz3tTTZbphbKhGSz3vTdb /ip4/192.168.88.233/tcp/20020","ts":"2022-03-08T08:47:57.699910867Z"}
{"caller":"obsaddr.go:397","level":"debug","module":"libp2p:net/identify","msg":"added own observed listen addr","observed":"/ip4/192.168.88.233/tcp/20012","ts":"2022-03-08T08:47:57.700039654Z"}
{"caller":"id.go:649","level":"debug","module":"libp2p:net/identify","msg":"12D3KooWBPiJ4rzKgz4NRka2zRAMF5JDYXNf6r5xDMxuusWNZYaw received listen addrs for 12D3KooWCUm3BxCXj5UTfkhbRnxb7hicz3tTTZbphbKhGSz3vTdb: [/ip4/192.168.88.233/tcp/20020]","ts":"2022-03-08T08:47:57.700066819Z"}
{"caller":"gossipsub.go:511","level":"debug","module":"libp2p:pubsub","msg":"PEERUP: Add new peer 12D3KooWCUm3BxCXj5UTfkhbRnxb7hicz3tTTZbphbKhGSz3vTdb using /meshsub/1.1.0","ts":"2022-03-08T08:47:57.700137429Z"}
{"caller":"basic_host.go:414","level":"debug","module":"libp2p:basichost","msg":"protocol negotiation took 770.404µs","ts":"2022-03-08T08:47:57.700386848Z"}
{"caller":"gossipsub.go:807","level":"debug","module":"libp2p:pubsub","msg":"GRAFT: add mesh link from 12D3KooWCUm3BxCXj5UTfkhbRnxb7hicz3tTTZbphbKhGSz3vTdb in 1de8816252b0093d3ad4b113923e44178f7ef43e09946bd2b4a49326cecc3573/4/8000000000000000000000000000000000000000000000000000000000000000/tx","ts":"2022-03-08T08:47:58.05448337Z"}
{"caller":"basic_host.go:414","level":"debug","module":"libp2p:basichost","msg":"protocol negotiation took 56.272µs","ts":"2022-03-08T08:48:01.703049297Z"}
{"caller":"validation.go:457","level":"debug","module":"libp2p:pubsub","msg":"validation done; took 92.596µs","ts":"2022-03-08T08:48:01.705158878Z"}
{"caller":"validation.go:457","level":"debug","module":"libp2p:pubsub","msg":"validation done; took 69.458µs","ts":"2022-03-08T08:48:01.716050092Z"}
{"caller":"basic_host.go:414","level":"debug","module":"libp2p:basichost","msg":"protocol negotiation took 46.358µs","ts":"2022-03-08T08:48:05.594683073Z"}
{"caller":"basic_host.go:414","level":"debug","module":"libp2p:basichost","msg":"protocol negotiation took 48.098µs","ts":"2022-03-08T08:48:05.594955572Z"}
{"caller":"pubsub.go:626","level":"info","module":"libp2p:pubsub","msg":"pubsub processloop shutting down","ts":"2022-03-08T08:48:10.61096531Z"}

Wrapping zap into go-git is not as performant as using zap directly, but the consistency is worth it i think. If we're concerend with logging performance we could look into using something like zap or zerolog as the base of common/logger.

[kostko]

Could we prefix modules with libp2p: similar to what we do for tendermint?

[ptrus]

Could we prefix modules with libp2p: similar to what we do for tendermint?

Yeah, just thinking if the prefix should be ipfs:? Since technically this sets the ipfs logger, which could be used by other libs as well (but most likely libp2p is the only dependency that uses it)

[kostko]

Yeah I would set it to libp2p as ipfs would make it seem we are using ipfs and this would be confusing :-)

[ptrus]

Yeah I would set it to libp2p as ipfs would make it seem we are using ipfs and this would be confusing :-)

Done, see updated example in the PR description