/
dial.go
101 lines (79 loc) · 2.53 KB
/
dial.go
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package relay
import (
"context"
"fmt"
"math/rand"
tpt "github.com/ipfs/fs-repo-migrations/ipfs-6-to-7/gx/ipfs/QmVxtCwKFMmwcjhQXsGj6m4JAW7nGb9hRoErH9jpgqcLxA/go-libp2p-transport"
ma "github.com/ipfs/fs-repo-migrations/ipfs-6-to-7/gx/ipfs/QmWWQ2Txc2c6tqjsBpzg5Ar652cHPGNsQQp2SejkNmkUMb/go-multiaddr"
pstore "github.com/ipfs/fs-repo-migrations/ipfs-6-to-7/gx/ipfs/QmXauCuJzmzapetmC6W4TuDJLL1yFFrVzSHoWv8YdbmnxH/go-libp2p-peerstore"
peer "github.com/ipfs/fs-repo-migrations/ipfs-6-to-7/gx/ipfs/QmZoWKhxUmZ2seW4BzX6fJkNR8hh9PsGModr7q171yq2SS/go-libp2p-peer"
)
var _ tpt.Dialer = (*RelayDialer)(nil)
type RelayDialer Relay
func (d *RelayDialer) Relay() *Relay {
return (*Relay)(d)
}
func (r *Relay) Dialer() *RelayDialer {
return (*RelayDialer)(r)
}
func (d *RelayDialer) Dial(a ma.Multiaddr) (tpt.Conn, error) {
return d.DialContext(d.ctx, a)
}
func (d *RelayDialer) DialContext(ctx context.Context, a ma.Multiaddr) (tpt.Conn, error) {
if !d.Matches(a) {
return nil, fmt.Errorf("%s is not a relay address", a)
}
parts := ma.Split(a)
spl, _ := ma.NewMultiaddr("/p2p-circuit")
var relayaddr, destaddr ma.Multiaddr
for i, p := range parts {
if p.Equal(spl) {
relayaddr = ma.Join(parts[:i]...)
destaddr = ma.Join(parts[i+1:]...)
break
}
}
dinfo, err := pstore.InfoFromP2pAddr(destaddr)
if err != nil {
return nil, err
}
if len(relayaddr.Bytes()) == 0 {
// unspecific relay address, try dialing using known hop relays
return d.tryDialRelays(ctx, *dinfo)
}
rinfo, err := pstore.InfoFromP2pAddr(relayaddr)
if err != nil {
return nil, err
}
return d.Relay().DialPeer(ctx, *rinfo, *dinfo)
}
func (d *RelayDialer) tryDialRelays(ctx context.Context, dinfo pstore.PeerInfo) (tpt.Conn, error) {
var relays []peer.ID
d.mx.Lock()
for p := range d.relays {
relays = append(relays, p)
}
d.mx.Unlock()
// shuffle list of relays, avoid overloading a specific relay
for i := range relays {
j := rand.Intn(i + 1)
relays[i], relays[j] = relays[j], relays[i]
}
for _, relay := range relays {
if len(d.host.Network().ConnsToPeer(relay)) == 0 {
continue
}
rctx, cancel := context.WithTimeout(ctx, HopConnectTimeout)
c, err := d.Relay().DialPeer(rctx, pstore.PeerInfo{ID: relay}, dinfo)
cancel()
if err == nil {
return c, nil
}
log.Debugf("error opening relay connection through %s: %s", dinfo.ID, err.Error())
}
return nil, fmt.Errorf("Failed to dial through %d known relay hosts", len(relays))
}
func (d *RelayDialer) Matches(a ma.Multiaddr) bool {
_, err := a.ValueForProtocol(P_CIRCUIT)
return err == nil
}