ceremonyclient/go-libp2p/p2p/protocol/circuitv2/client/client.go

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2023-08-21 03:50:38 +00:00
package client
import (
"context"
"io"
"sync"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/transport"
"github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/proto"
logging "github.com/ipfs/go-log/v2"
)
var log = logging.Logger("p2p-circuit")
// Client implements the client-side of the p2p-circuit/v2 protocol:
// - it implements dialing through v2 relays
// - it listens for incoming connections through v2 relays.
//
// For backwards compatibility with v1 relays and older nodes, the client will
// also accept relay connections through v1 relays and fallback dial peers using p2p-circuit/v1.
// This allows us to use the v2 code as drop in replacement for v1 in a host without breaking
// existing code and interoperability with older nodes.
type Client struct {
ctx context.Context
ctxCancel context.CancelFunc
host host.Host
upgrader transport.Upgrader
incoming chan accept
mx sync.Mutex
activeDials map[peer.ID]*completion
hopCount map[peer.ID]int
}
var _ io.Closer = &Client{}
var _ transport.Transport = &Client{}
type accept struct {
conn *Conn
writeResponse func() error
}
type completion struct {
ch chan struct{}
relay peer.ID
err error
}
// New constructs a new p2p-circuit/v2 client, attached to the given host and using the given
// upgrader to perform connection upgrades.
func New(h host.Host, upgrader transport.Upgrader) (*Client, error) {
cl := &Client{
host: h,
upgrader: upgrader,
incoming: make(chan accept),
activeDials: make(map[peer.ID]*completion),
hopCount: make(map[peer.ID]int),
}
cl.ctx, cl.ctxCancel = context.WithCancel(context.Background())
return cl, nil
}
// Start registers the circuit (client) protocol stream handlers
func (c *Client) Start() {
c.host.SetStreamHandler(proto.ProtoIDv2Stop, c.handleStreamV2)
}
func (c *Client) Close() error {
c.ctxCancel()
c.host.RemoveStreamHandler(proto.ProtoIDv2Stop)
return nil
}