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for safety!

use mockpeer.WithID methods to create peers in tests

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

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

to emphasize idempotence

implementation will be patched to ensure bitswap messages cannot contain
duplicate blocks or keys

addresses concurrent access in bitswap session

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

sending

true -> always send to peer

false -> use ledger-based strategy described in IPFS paper draft 3

misc:
* test network client getting more than max
* test for find providers
* rename factory method
* local network
* misc test improvements
* test bitswap get block timeout
* test provider exists but cannot connect to peer
* test sending a message async over local network

> Why expose num bytes sent and received?

    Makes it easy to test consistency of the ledgers

> Got a better reason?

    Makes it possible to expose metrics to the people-facing API

didn't run tests after the refactor. apologies.

Move go-ipfs/bitswap package to go-ipfs/exchange/bitswap

* Delineates the difference between the generic exchange interface and
  implementations (eg. BitSwap protocol)

  Thus, the bitswap protocol can be refined without having to overthink
  how future exchanges will work. Aspects common to BitSwap and other
  exchanges can be extracted out to the exchange package in piecemeal.

  Future exchange implementations can be placed in sibling packages next
  to exchange/bitswap. (eg. exchange/multilateral)