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I think it's time to move a lot of the peer-to-peer networking
but-not-ipfs-specific things into its own package: p2p.
This could in the future be split off into its own library.
The first thing to go is the peer.

@jbenet @whyrusleeping

This commit replaces peer.PeerInfo with peer.ID in the bitswap package

@jbenet @whyrusleeping

the next commit will change bitswap.Network.FindProviders to only deal
with IDs

cc @whyrusleeping

This reverts commit bf88f1aec5e3d397f97d64de52b52686cc7a8c8f.

Had to change the network interface from DialPeer(peer.ID) to
DialPeer(peer.PeerInfo), so that addresses of a provider are
handed to the network.

@maybebtc and I are discussing whether this should go all the
way down to the network, or whether the network _should always
work_ with just an ID (which means the network needs to be
able to resolve ID -> Addresses, using the routing system.
This latter point might mean that "routing" might need to
break down into subcomponents. It's a bit sketchy that
the Network would become smarter than just dial/listen and
I/O, but maybe there's a distinction between net.Network,
and something like a peernet.Network that has routing
built in...)

https://build.protocol-dev.com/job/race/9352/console

@jbenet @whyrusleeping

pinging you guys to spread awareness about the delay.D type for
configurable delays

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

this is a major refactor of the entire codebase
it changes the monolithic peer.Peer into using
a peer.ID and a peer.Peerstore.

Other changes:
- removed handshake3.
-	testutil vastly simplified peer
-	secio bugfix + debugging logs
-	testutil: RandKeyPair
-	backpressure bugfix: w.o.w.
-	peer: added hex enc/dec
-	peer: added a PeerInfo struct
  PeerInfo is a small struct used to pass around a peer with
 	a set of addresses and keys. This is not meant to be a
 	complete view of the system, but rather to model updates to
 	the peerstore. It is used by things like the routing system.
-	updated peer/queue + peerset
-	latency metrics
-	testutil: use crand for PeerID gen
 	RandPeerID generates random "valid" peer IDs. it does not
 	NEED to generate keys because it is as if we lost the key
 	right away. fine to read some randomness and hash it. to
 	generate proper keys and an ID, use:
 	  sk, pk, _ := testutil.RandKeyPair()
 	  id, _ := peer.IDFromPublicKey(pk)
 	Also added RandPeerIDFatal helper
- removed old spipe
- updated seccat
- core: cleanup initIdentity
- removed old getFromPeerList

addresses...

https://github.com/jbenet/go-ipfs/pull/438/files#r21878994

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

bitswap keeps the threadsafe version. observing the ledger shows that it
doesn't need it anymore (ledgermanager is protected and safe).

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

it seems to make sense since, in each place, the Key and Priority
represent the same information

b/c you know the saying...

"It is better to have 100 functions operate on one data structure than
10 functions on 10 data structures."

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

(merely by convention)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

function should be a no-op when passed an empty slice

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

notice that moving the blockstore fetch into the manager removes the
weird error handling case.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

good to const until it's required for them to be variable.

TODO pass them in as configuration options

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

performing CR in the form of a PR. Let me know what you think.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

make vendor

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

Conflicts:
	exchange/bitswap/bitswap.go