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https://github.com/libp2p/go-libp2p-core.git
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114 lines
4.2 KiB
Go
114 lines
4.2 KiB
Go
// Package transport provides the Transport interface, which represents
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// the devices and network protocols used to send and recieve data.
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package transport
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import (
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"context"
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"net"
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"time"
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"github.com/libp2p/go-libp2p-core/mux"
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"github.com/libp2p/go-libp2p-core/network"
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"github.com/libp2p/go-libp2p-core/peer"
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ma "github.com/multiformats/go-multiaddr"
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)
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// DialTimeout is the maximum duration a Dial is allowed to take.
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// This includes the time between dialing the raw network connection,
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// protocol selection as well the handshake, if applicable.
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var DialTimeout = 60 * time.Second
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// AcceptTimeout is the maximum duration an Accept is allowed to take.
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// This includes the time between accepting the raw network connection,
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// protocol selection as well as the handshake, if applicable.
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var AcceptTimeout = 60 * time.Second
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// A CapableConn represents a connection that has offers the basic
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// capabilities required by libp2p: stream multiplexing, encryption and
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// peer authentication.
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//
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// These capabilities may be natively provided by the transport, or they
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// may be shimmed via the "connection upgrade" process, which converts a
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// "raw" network connection into one that supports such capabilities by
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// layering an encryption channel and a stream multiplexer.
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//
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// CapableConn provides accessors for the local and remote multiaddrs used to
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// establish the connection and an accessor for the underlying Transport.
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type CapableConn interface {
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mux.MuxedConn
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network.ConnSecurity
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network.ConnMultiaddrs
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// Transport returns the transport to which this connection belongs.
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Transport() Transport
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}
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// Transport represents any device by which you can connect to and accept
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// connections from other peers.
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//
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// The Transport interface allows you to open connections to other peers
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// by dialing them, and also lets you listen for incoming connections.
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//
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// Connections returned by Dial and passed into Listeners are of type
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// CapableConn, which means that they have been upgraded to support
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// stream multiplexing and connection security (encryption and authentication).
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//
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// For a conceptual overview, see https://docs.libp2p.io/concepts/transport/
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type Transport interface {
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// Dial dials a remote peer. It should try to reuse local listener
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// addresses if possible but it may choose not to.
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Dial(ctx context.Context, raddr ma.Multiaddr, p peer.ID) (CapableConn, error)
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// CanDial returns true if this transport knows how to dial the given
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// multiaddr.
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//
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// Returning true does not guarantee that dialing this multiaddr will
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// succeed. This function should *only* be used to preemptively filter
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// out addresses that we can't dial.
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CanDial(addr ma.Multiaddr) bool
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// Listen listens on the passed multiaddr.
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Listen(laddr ma.Multiaddr) (Listener, error)
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// Protocol returns the set of protocols handled by this transport.
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//
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// See the Network interface for an explanation of how this is used.
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Protocols() []int
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// Proxy returns true if this is a proxy transport.
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//
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// See the Network interface for an explanation of how this is used.
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// TODO: Make this a part of the go-multiaddr protocol instead?
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Proxy() bool
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}
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// Listener is an interface closely resembling the net.Listener interface. The
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// only real difference is that Accept() returns Conn's of the type in this
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// package, and also exposes a Multiaddr method as opposed to a regular Addr
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// method
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type Listener interface {
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Accept() (CapableConn, error)
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Close() error
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Addr() net.Addr
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Multiaddr() ma.Multiaddr
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}
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// Network is an inet.Network with methods for managing transports.
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type TransportNetwork interface {
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network.Network
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// AddTransport adds a transport to this Network.
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//
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// When dialing, this Network will iterate over the protocols in the
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// remote multiaddr and pick the first protocol registered with a proxy
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// transport, if any. Otherwise, it'll pick the transport registered to
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// handle the last protocol in the multiaddr.
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//
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// When listening, this Network will iterate over the protocols in the
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// local multiaddr and pick the *last* protocol registered with a proxy
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// transport, if any. Otherwise, it'll pick the transport registered to
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// handle the last protocol in the multiaddr.
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AddTransport(t Transport) error
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}
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