* identify: cache the snapshot
* identify: refactor sending of Identify pushes
* identify: fix concurrency when sending pushes
* identify: fix timestamp handling
* identify: remove unneeded pushSemaphore
* identify: improve logging
* identify: use a sequence number instead of a timestamp
* identify: start with an empty snapshot
* identify: wait until we've actually finished setting up
This patch updates go-libp2p for the stream interface changes in go-libp2p-core
0.7.0. This is a _significant_ breaking change to streams and all users should
read https://github.com/libp2p/go-libp2p-core/releases/tag/v0.7.0. In practice,
this change should remove a significant footgun.
TL;DR:
* `Stream.Close` now behaves like `net.TCPConn.Close`.
* There is a new `Stream.CloseWrite` (send an EOF) and `Stream.CloseRead` (close
for reading), behaving like their counterparts in `net.TCPConn`.
0. NEVER call `peerstore.SetProtocols(p)` (clear the protocol set). Given the
new identify events, if someone looked in the peerstore at the wrong time, they
could decide that the peer no longer speaks some protocol.
1. Reliably wait for identify before trying to open a stream. The old logic was
_really_ racy.
2. Avoids potentially calling identify on the same connection multiple times.
3. Calls identify as early as possible. Previously, we'd invoke identify on
inbound connections using an event that was only invoked _after_ all `Connected`
event handlers completed. Now we invoke identify from a `Connected` handler.
Technically a breaking change because I changed the constructor casing but
nobody's using this outside of libp2p (yet), mostly because the type hasn't been
exported.
RandLocalTCPAddress is mostly useful when we *actually* want to listen on a real
address. Unfortunately, when running a bunch of tests, we can actually run
out.
With this change, a collision means we have a duplicate peer ID so yeah...
fixes#473
