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@whyrusleeping @jbenet this is a WIP with the DHT.

wip

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

Conflicts:
	epictest/addcat_test.go
	exchange/bitswap/testnet/peernet.go
	exchange/bitswap/testutils.go
	routing/mock/centralized_server.go
	routing/mock/centralized_test.go
	routing/mock/interface.go

fix(routing/mock) fill in function definition

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

See https://github.com/jbenet/go-ipfs/issues/153#issuecomment-63350535

for higher SnR at IPFS_LOGGING=info

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

@jbenet

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

This commit makes GetProviders (sync) respect the request context. It
also amends all of GetProviders' callsites to pass a context in. This
meant changing the signature of the dht's handlerfunc.

I think I'll start referring to the request context as Vito Corleone.

cc @whyrusleeping @jbenet

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

the important change here is that within FindProvidersAsync, the channel
is closed using a `defer`. This ensures the channel is always closed,
regardless of the path taken to exit.

+ misc cleanup

cc @whyrusleeping @jbenet

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

- distinguish log.Error and log.Errorf functions
- Initialize structs with field names
- A bit of unreachable code (defers)

dht doesn't need the whole network interface, only needs a Dialer.
(much reduced surface of possible errors)

The query-- once it's actually attempting to connect to a peer--
should be the one connecting.

![](http://m.memegen.com/77n7dk.jpg)

and other logging switches. I kept the u.PErr and u.POut in cli
commands, as those do need to write raw output directly.

- use log.* instead of u.*
- use automatic type conversions to .String()
  (Peer.String() prints nicely, and avoids calling b58 encoding
  until needed)