* Configurable multistream-select protocol. Add V1Lazy variant. (#1245)
Make the multistream-select protocol (version) configurable
on transport upgrades as well as for individual substreams.
Add a "lazy" variant of multistream-select 1.0 that delays
sending of negotiation protocol frames as much as possible
but is only safe to use under additional assumptions that
go beyond what is required by the multistream-select v1
specification.
* Improve the code readability of the chat example (#1253)
* Add bridged chats (#1252)
* Try fix CI (#1261)
* Print Rust version on CI
* Don't print where not appropriate
* Change caching strategy
* Remove win32 build
* Remove win32 from list
* Update libsecp256k1 dep to 0.3.0 (#1258)
* Update libsecp256k1 dep to 0.3.0
* Sign now cannot fail
* Upgrade url and percent-encoding deps to 2.1.0 (#1267)
* Upgrade percent-encoding dep to 2.1.0
* Upgrade url dep to 2.1.0
* Fix more conflicts
* Revert CIPHERS set to null (#1273)
* libp2p-ping improvements.
* re #950: Removes use of the `OneShotHandler`, but still sending each
ping over a new substream, as seems to be intentional since #828.
* re #842: Adds an integration test that exercises the ping behaviour through
a Swarm, requiring the RTT to be below a threshold. This requires disabling
Nagle's algorithm as it can interact badly with delayed ACKs (and has been
observed to do so in the context of the new ping example and integration test).
* re #864: Control of the inbound and outbound (sub)stream protocol upgrade
timeouts has been moved from the `NodeHandlerWrapperBuilder` to the
`ProtocolsHandler`. That may also alleviate the need for a custom timeout
on an `OutboundSubstreamRequest` as a `ProtocolsHandler` is now free to
adjust these timeouts over time.
Other changes:
* A new ping example.
* Documentation improvements.
* More documentation improvements.
* Add PingPolicy and ensure no event is dropped.
* Remove inbound_timeout/outbound_timeout.
As per review comment, the inbound timeout is now configured
as part of the `listen_protocol` and the outbound timeout as
part of the `OutboundSubstreamRequest`.
* Simplify and generalise.
Generalise `ListenProtocol` to `SubstreamProtocol`, reusing it in
the context of `ProtocolsHandlerEvent::OutboundSubstreamRequest`.
* Doc comments for SubstreamProtocol.
* Adapt to changes in master.
* Relax upper bound for ping integration test rtt.
For "slow" CI build machines?
* Add ProtocolsHandler trait
* Reexport symbols
* Add a note about shutting down
* Add a PeriodicPingHandler and a PingListenHandler
* Fix core doctest
* Add tolerating not supported
* Fix concerns
