Roman Borschel 5ba7c4831b
Permit concurrent dialing attempts per peer. (#1506)
* Permit concurrent dialing attempts per peer.

This is a follow-up to https://github.com/libp2p/rust-libp2p/pull/1440
and relates to https://github.com/libp2p/rust-libp2p/issues/925.
This change permits multiple dialing attempts per peer.
Note though that `libp2p-swarm` does not yet make use of this ability,
retaining the current behaviour. The essence of the changes are that the
`Peer` API now provides `Peer::dial()`, i.e. regardless of the state in
which the peer is. A dialing attempt is always made up of one or more
addresses tried sequentially, as before, but now there can be multiple
dialing attempts per peer. A configurable per-peer limit for outgoing
connections and thus concurrent dialing attempts is also included.

* Introduce `DialError` in `libp2p-swarm`.

For a cleaner API and to treat the case of no addresses
for a peer as an error, such that a `NetworkBehaviourAction::DialPeer`
request is always matched up with either `inject_connection_established`
or `inject_dial_error`.

* Fix rustdoc link.

* Add `DialPeerCondition::Always`.

* Adapt to master.

* Update changelog.
2020-05-12 13:10:18 +02:00
2020-04-09 16:54:01 +02:00
2020-03-11 15:33:22 +01:00
2017-11-08 13:03:59 +01:00
2019-09-24 18:55:31 +02:00

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