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* add SignedEnvelope type

* use struct for SignedEnvelope instead of exposing protobuf directly

* doc comments for envelopes

* tests for SignedEnvelopes

* add helpers to make routing records for Host

* fix doc comment

* go fmt

* add method to peerstore to retrieve signed routing records

* update to match spec changes

* just use nanoseconds

* use proto3  &  rename fields to match spec changes

* use proto3 for routing records

* make envelope fields private & validate on unmarshal

* use buffer pool for envelope signatures

* tests for RoutingState

* go fmt

* rename Equals -> Equal, add some comments

* use test helpers

* get rid of unsigned RoutingState struct, only expose SignedRoutingState

* rm batching SignedRoutingStates accessor in peerstore

the datastore peerstore implementation doesn't support batched reads, so
it's no more efficient to get a bunch of states at once than it
is to call SignedRoutingState multiple times.

* whitespace

* expose struct fields & remove accessors

* use camelCase in protos for consistency

* use multiformats uvarint for length-prefixes

* remove payloadType check when unmarhaling

* rm stray ref to golang/protobuf

* define CertifiedAddrBook to avoid breaking API change

* add events for updated addresses and routing state

* remove SignedRoutingStateFromHost helper

moving this to go-libp2p

* add routing state records, extend peerstore API

* fix: rebuild protos with new gogofaster generator

* filter private addrs from signed routing records

* envelope: use byte slices from pool; adjust interface.

* move envelope to record package.

* move protobuf files; adjust imports everywhere.

* rename RoutingStateRecord -> PeerRecord

also removes embedded reference to Envelope from the record,
as that was confusing.

as a result, the CertifiedAddrBook now accepts/returns
record.SignedEnvelope instead of a specialized type.

* hoist Seq from PeerRecord to SignedEnvelope

* test that PeerRecords can't be signed by wrong key

* commit go.sum

* add Seq field to envelope signature

* fix proto_path in Makefile

* fix import ordering

* comments for PeerRecord proto message

also removes the seq field from PeerMessage proto,
since it was moved to the SignedEnvelope

* use Record type for envelope payloads

* rename SignedEnvelope -> Envelope, unmarshal payload in ConsumeEnvelope

* return buffer to pool before early return

* doc comments

* rename CertifiedAddrBook methods, update comments

* cache unmarshalled Record payload inside Envelope

* doc comments

* store reflect.Type when registering Record

* Revert "return buffer to pool before early return"

8d8da386f26482e06dc21989a6b5ade69f0a46d9

misread this - unsigned will be nil if there's an
error, so it was right the way it was

* use a DefaultRecord for unregistered PayloadTypes

instead of returning an error if we don't have a registered
Record for a given PayloadType, we can have a catch-all
DefaultRecord type that just preserves the original payload
as a []byte

* cleanup DefaultRecord code a bit

- removes unused error return from blankRecordForPayloadType
- just references instead of copying in DefaultRecord.UnmarshalRecord
  I figure this is likely safe, since we'll be unmarshalling from the
  payload of an Envelope, which shouldn't get altered after it's
  created.

* use explicit payloadType in MakeEnvelopeWithRecord

* Revert DefaultRecord commits

ae3bc7bdfb657c232229229706854a56effca80b
a26c845a766b45ceabd87c17c0801d191650f0d4

* doc comments

* move Seq field back to PeerRecord

* make diffs optional in EvtLocalAddressesUpdated

* more envelope tests

* replace MakeEnvelope with record.Seal

also:
- add Domain and Codec fields to Record interface

* fix import

* add interface check

* rename ProcessPeerRecord -> ConsumePeerRecord

also, adds bool `accepted` return value

* rename event field, add doc comment

* peer record protobuf: fix field casing.

* record protobuf: add docs and fix casing.

* cleanup: group imports.

* nit: split test/utils.go => test/{addrs,errors}.go.
Co-authored-by: Raúl Kripalani <raul.kripalani@gmail.com>