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dht.go
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dht.go
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package ipfs
import (
"context"
"fmt"
"log"
"time"
"github.com/cretz/bine/tor"
"github.com/cretz/tor-dht-poc/go-tor-dht-poc/tordht"
host "github.com/libp2p/go-libp2p-host"
dht "github.com/libp2p/go-libp2p-kad-dht"
peer "github.com/libp2p/go-libp2p-peer"
peerstore "github.com/libp2p/go-libp2p-peerstore"
ma "github.com/multiformats/go-multiaddr"
addr "github.com/ipfs/go-ipfs-addr"
)
type torDHT struct {
debug bool
tor *tor.Tor
ipfsHost host.Host
ipfsDHT *dht.IpfsDHT
peerInfo *tordht.PeerInfo
}
func (t *torDHT) Close() (err error) {
if t.ipfsDHT != nil {
err = t.ipfsDHT.Close()
}
if t.ipfsHost != nil {
if hostCloseErr := t.ipfsHost.Close(); hostCloseErr != nil {
// Just overwrite
err = hostCloseErr
}
}
return
}
func (t *torDHT) PeerInfo() *tordht.PeerInfo { return t.peerInfo }
func (t *torDHT) Provide(ctx context.Context, id []byte) error {
if cid, err := ipfsImpl.hashedCID(id); err != nil {
return err
} else {
t.debugf("Providing CID: %v", cid)
return t.ipfsDHT.Provide(ctx, cid, true)
}
}
func (t *torDHT) FindProviders(ctx context.Context, id []byte, maxCount int) ([]*tordht.PeerInfo, error) {
cid, err := ipfsImpl.hashedCID(id)
if err != nil {
return nil, err
}
t.debugf("Finding providers for CID: %v", cid)
ret := []*tordht.PeerInfo{}
for p := range t.ipfsDHT.FindProvidersAsync(ctx, cid, maxCount) {
if info, err := t.makePeerInfo(p.ID, p.Addrs[0]); err != nil {
// TODO: warn instead?
return nil, fmt.Errorf("Failed parsing '%v': %v", p, err)
} else {
ret = append(ret, info)
}
}
return ret, ctx.Err()
}
func (t *torDHT) debugf(format string, args ...interface{}) {
if t.debug {
log.Printf("[DEBUG] "+format, args...)
}
}
func (t *torDHT) applyPeerInfo() error {
if listenAddrs := t.ipfsHost.Network().ListenAddresses(); len(listenAddrs) > 1 {
return fmt.Errorf("Expected at most 1 listen onion address, got %v", listenAddrs)
} else if len(listenAddrs) == 0 {
// no addr
return nil
} else if info, err := t.makePeerInfo(t.ipfsHost.ID(), listenAddrs[0]); err != nil {
return err
} else {
t.peerInfo = info
return nil
}
}
func (t *torDHT) makePeerInfo(id peer.ID, addr ma.Multiaddr) (*tordht.PeerInfo, error) {
ret := &tordht.PeerInfo{ID: id.Pretty()}
var err error
if ret.OnionServiceID, ret.OnionPort, err = defaultAddrFormat.onionInfo(addr); err != nil {
return nil, err
}
return ret, nil
}
func (t *torDHT) connectPeers(ctx context.Context, peers []*tordht.PeerInfo, minRequired int) error {
if len(peers) < minRequired {
minRequired = len(peers)
}
t.debugf("Starting %v peer connections, waiting for at least %v", len(peers), minRequired)
// Connect to a bunch asynchronously
peerConnCh := make(chan error, len(peers))
for _, peer := range peers {
// There may be an inexplicable race here so I sleep a tad
// TODO: investigate
time.Sleep(100 * time.Millisecond)
go func(peer *tordht.PeerInfo) {
t.debugf("Attempting to connect to peer %v", peer)
if err := t.connectPeer(ctx, peer); err != nil {
t.debugf("Failed connecting to peer %v: %v", err)
peerConnCh <- fmt.Errorf("Peer connection to %v failed: %v", peer, err)
} else {
t.debugf("Successfully connected to peer %v", peer)
peerConnCh <- nil
}
}(peer)
}
peerErrs := []error{}
peersConnected := 0
// Until there is an error or we have enough
for {
select {
case peerErr := <-peerConnCh:
if peerErr == nil {
peersConnected++
if peersConnected >= minRequired {
return nil
}
} else {
peerErrs = append(peerErrs, peerErr)
if len(peerErrs) > len(peers)-minRequired {
return fmt.Errorf("Many failures, unable to get enough peers: %v", peerErrs)
}
}
case <-ctx.Done():
return fmt.Errorf("Context errored with '%v', peer errors: %v", ctx.Err(), peerErrs)
}
}
}
func (t *torDHT) connectPeer(ctx context.Context, peerInfo *tordht.PeerInfo) error {
if peer, err := t.addPeer(peerInfo); err != nil {
return err
} else {
return t.ipfsHost.Connect(ctx, *peer)
}
}
func (t *torDHT) addPeer(peerInfo *tordht.PeerInfo) (*peerstore.PeerInfo, error) {
ipfsAddrStr := fmt.Sprintf("%v/ws/ipfs/%v",
defaultAddrFormat.onionAddr(peerInfo.OnionServiceID, peerInfo.OnionPort), peerInfo.ID)
if ipfsAddr, err := addr.ParseString(ipfsAddrStr); err != nil {
return nil, err
} else if peer, err := peerstore.InfoFromP2pAddr(ipfsAddr.Multiaddr()); err != nil {
return nil, err
} else {
t.ipfsHost.Peerstore().AddAddrs(peer.ID, peer.Addrs, peerstore.PermanentAddrTTL)
return peer, nil
}
}