This commit removes the `Network` abstraction, thus managing `Listeners`
and the connection `Pool` in `Swarm` directly. This is done under the
assumption that noone uses the `Network` abstraction directly, but
instead everyone always uses it through `Swarm`. Both `Listeners` and
`Pool` are moved from `libp2p-core` into `libp2p-swarm`. Given that they
are no longer exposed via `Network`, they can be treated as an
implementation detail of `libp2p-swarm` and `Swarm`.
This change does not include any behavioural changes.
This change has the followin benefits:
- Removal of `NetworkEvent`, which was mostly an isomorphism of
`SwarmEvent`.
- Removal of the never-directly-used `Network` abstraction.
- Removal of now obsolete verbose `Peer` (`core/src/network/peer.rs`)
construct.
- Removal of `libp2p-core` `DialOpts`, which is a direct mapping of
`libp2p-swarm` `DialOpts`.
- Allowing breaking changes to the connection handling and `Swarm` API
interface without a breaking change in `libp2p-core` and thus a
without a breaking change in `/transport` protocols.
This change enables the following potential future changes:
- Removal of `NodeHandler` and `ConnectionHandler`. Thus allowing to
rename `ProtocolsHandler` into `ConnectionHandler`.
- Moving `NetworkBehaviour` and `ProtocolsHandler` into `libp2p-core`,
having `libp2p-xxx` protocol crates only depend on `libp2p-core` and
thus allowing general breaking changes to `Swarm` without breaking all
`libp2p-xxx` crates.
There are 3 ways to close a connection:
1. `ProtocolsHandlerEvent::Close`
2. `KeepAlive::No` via `ProtocolsHandler::connection_keep_alive`
3. `NetworkBehaviourAction::CloseConnection`
This commit references (2) as an alternative to (1) in the documentation
of (1).
Within `Provider::new_stream` we wait for the socket to become writable
(`stream.writable`), before returning it as a stream. In other words, we
are waiting for the socket to connect before returning it as a new TCP
connection. Waiting to connect before returning it as a new TCP
connection allows us to catch TCP connection establishment errors early.
While `stream.writable` drives the process of connecting, it does not
surface potential connection errors themselves. These need to be
explicitly collected via `TcpSocket::take_error`. If not explicitly
collected, they will surface on future operations on the socket.
For now this commit explicitly calls `TcpSocket::take_error` when using
`async-io` only. `tokio` introduced the method (`take_error`) in
https://github.com/tokio-rs/tokio/pull/4364 though later reverted it in
https://github.com/tokio-rs/tokio/pull/4392. Once re-reverted, the same
patch can be applied when using `libp2p-tcp` with tokio.
---
One example on how this bug surfaces today:
A `/dnsaddr/xxx` `Multiaddr` can potentially resolve to multiple IP
addresses, e.g. to the IPv4 and the IPv6 addresses of a node.
`libp2p-dns` tries dialing each of them in sequence using `libp2p-tcp`,
returning the first that `libp2p-tcp` reports as successful.
Say that the local node tries the IPv6 address first. In the scenario
where the local node's networking stack does not support IPv6, e.g. has
no IPv6 route, the connection attempt to the resolved IPv6 address of
the remote node fails. Given that `libp2p-tcp` does not call
`TcpSocket::take_error`, it would falsly report the TCP connection
attempt as successful. `libp2p-dns` would receive the "successful" TCP
connection for the IPv6 address from `libp2p-tcp` and would not attempt
to dial the IPv4 address, even though it supports IPv4, and instead
bubble up the "successful" IPv6 TCP connection. Only later, when writing
or reading from the "successful" IPv6 TCP connection, would the IPv6
error surface.
Co-authored-by: Oliver Wangler <oliver@wngr.de>
When a peer disconnects, reservations associated with that peer are removed from
the set of reservations of the peer. In case the set of reservations for the
peer is now empty, remove the entire peer.
Same when a reservation times out.
Previously, the negotiated PeerId was included in the swarm event and
inject_dial_failure’s arguments while the expected one was absent. This
patch adds the negotiated PeerId to the DialError and includes the expected
one in the notifications.
Co-authored-by: Roland Kuhn <rk@rkuhn.info>
Allows `NetworkBehaviour` implementations to dial a peer, but instruct
the dialed connection to be upgraded as if it were the listening
endpoint.
This is needed when establishing direct connections through NATs and/or
Firewalls (hole punching). When hole punching via TCP (QUIC is different
but similar) both ends dial the other at the same time resulting in a
simultaneously opened TCP connection. To disambiguate who is the dialer
and who the listener there are two options:
1. Use the Simultaneous Open Extension of Multistream Select. See
[sim-open] specification and [sim-open-rust] Rust implementation.
2. Disambiguate the role (dialer or listener) based on the role within
the DCUtR [dcutr] protocol. More specifically the node initiating the
DCUtR process will act as a listener and the other as a dialer.
This commit enables (2), i.e. enables the DCUtR protocol to specify the
role used once the connection is established.
While on the positive side (2) requires one round trip less than (1), on
the negative side (2) only works for coordinated simultaneous dials.
I.e. when a simultaneous dial happens by chance, and not coordinated via
DCUtR, the connection attempt fails when only (2) is in place.
[sim-open]: https://github.com/libp2p/specs/blob/master/connections/simopen.md
[sim-open-rust]: https://github.com/libp2p/rust-libp2p/pull/2066
[dcutr]: https://github.com/libp2p/specs/blob/master/relay/DCUtR.md
This commit adds an implementation for the circuit relay v2 protocol to be used
as a relay server, i.e. it supports incoming HOP requests and outgoing STOP
requests and used as a relay clients, i.e. outgoing HOP requests and incoming
STOP requests.
The existing circuit relay v1 protocol implementation is moved to
protocols/relay/src/v1.
Co-authored-by: ronzigelman <ronzigelman@gmail.com>
Co-authored-by: Marco Munizaga <git@marcopolo.io>
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
Co-authored-by: Elena Frank <57632201+elenaf9@users.noreply.github.com>
Since https://github.com/libp2p/rust-libp2p/pull/2248 dial attempts are
no longer reported per address, but instead reported for all addresses
of a single dial at once.
This commit updates the comment accordingly.
This commit adds a behaviour protocol that implements the AutoNAT specification.
It enables users to detect whether they are behind a NAT. The Autonat Protocol
implements a Codec for the Request-Response protocol, and wraps it in a new
Network Behaviour with some additional functionality.
Co-authored-by: David Craven <david@craven.ch>
Co-authored-by: Max Inden <mail@max-inden.de>
Enable a `NetworkBehaviour` or a user via `Swarm::dial` to override the
dial concurrency factor per dial. This is especially relevant in the
case of libp2p-autonat where one wants to probe addresses in sequence to
reduce the amount of work a remote peer can force onto the local node.
To enable the above, this commit also:
- Introduces `libp2p_core::DialOpts` mirroring `libp2p_swarm::DialOpts`.
Passed as an argument to `Network::dial`.
- Removes `Peer::dial` in favor of `Network::dial`.
- Simplifies `Swarm::dial_with_handler`.
The introduction of `libp2p_core::DialOpts` will be useful beyond this
feature, e.g. for https://github.com/libp2p/rust-libp2p/pull/2363.
In the long run I would like to move and merge `libp2p_core::Network`
and `libp2p_core::Pool` into `libp2p_swarm::Swarm` thus deduplicating
`libp2p_core::DialOpts` and `libp2p_swarm::DialOpts`.
Fixes#2385.
Handling multiple interfaces in mdns. The socket logic was moved into an
instance while the mdns behaviour watches for interface changes and creates new
instances with a dedicated send/recv socket.
Co-authored-by: Max Inden <mail@max-inden.de>
