Golang pb.PBPeersToPeerInfos函数代码示例

func (dht *IpfsDHT) handleAddProvider(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
	lm := make(lgbl.DeferredMap)
	lm["peer"] = func() interface{} { return p.Pretty() }

	defer log.EventBegin(ctx, "handleAddProvider", lm).Done()
	key := key.Key(pmes.GetKey())
	lm["key"] = func() interface{} { return key.Pretty() }

	log.Debugf("%s adding %s as a provider for '%s'\n", dht.self, p, key)

	// add provider should use the address given in the message
	pinfos := pb.PBPeersToPeerInfos(pmes.GetProviderPeers())
	for _, pi := range pinfos {
		if pi.ID != p {
			// we should ignore this provider reccord! not from originator.
			// (we chould sign them and check signature later...)
			log.Debugf("handleAddProvider received provider %s from %s. Ignore.", pi.ID, p)
			continue
		}

		if len(pi.Addrs) < 1 {
			log.Debugf("%s got no valid addresses for provider %s. Ignore.", dht.self, p)
			continue
		}

		log.Infof("received provider %s for %s (addrs: %s)", p, key, pi.Addrs)
		if pi.ID != dht.self { // dont add own addrs.
			// add the received addresses to our peerstore.
			dht.peerstore.AddAddrs(pi.ID, pi.Addrs, peer.ProviderAddrTTL)
		}
		dht.providers.AddProvider(ctx, key, p)
	}

	return nil, nil
}

// getValueOrPeers queries a particular peer p for the value for
// key. It returns either the value or a list of closer peers.
// NOTE: It will update the dht's peerstore with any new addresses
// it finds for the given peer.
func (dht *IpfsDHT) getValueOrPeers(ctx context.Context, p peer.ID,
	key key.Key) (*pb.Record, []peer.PeerInfo, error) {

	pmes, err := dht.getValueSingle(ctx, p, key)
	if err != nil {
		return nil, nil, err
	}

	// Perhaps we were given closer peers
	peers := pb.PBPeersToPeerInfos(pmes.GetCloserPeers())

	if record := pmes.GetRecord(); record != nil {
		// Success! We were given the value
		log.Debug("getValueOrPeers: got value")

		// make sure record is valid.
		err = dht.verifyRecordOnline(ctx, record)
		if err != nil {
			log.Info("Received invalid record! (discarded)")
			// return a sentinal to signify an invalid record was received
			err = errInvalidRecord
			record = new(pb.Record)
		}
		return record, peers, err
	}

	if len(peers) > 0 {
		log.Debug("getValueOrPeers: peers")
		return nil, peers, nil
	}

	log.Warning("getValueOrPeers: routing.ErrNotFound")
	return nil, nil, routing.ErrNotFound
}

func (c *Client) FindPeer(ctx context.Context, id peer.ID) (peer.PeerInfo, error) {
	defer log.EventBegin(ctx, "findPeer", id).Done()
	request := pb.NewMessage(pb.Message_FIND_NODE, string(id), 0)
	response, err := c.proxy.SendRequest(ctx, request) // hide remote
	if err != nil {
		return peer.PeerInfo{}, err
	}
	for _, p := range pb.PBPeersToPeerInfos(response.GetCloserPeers()) {
		if p.ID == id {
			return p, nil
		}
	}
	return peer.PeerInfo{}, errors.New("could not find peer")
}

func (c *Client) FindProvidersAsync(ctx context.Context, k key.Key, max int) <-chan peer.PeerInfo {
	ctx = logging.ContextWithLoggable(ctx, logging.Uuid("findProviders"))
	defer log.EventBegin(ctx, "findProviders", &k).Done()
	ch := make(chan peer.PeerInfo)
	go func() {
		defer close(ch)
		request := pb.NewMessage(pb.Message_GET_PROVIDERS, string(k), 0)
		response, err := c.proxy.SendRequest(ctx, request)
		if err != nil {
			log.Debug(err)
			return
		}
		for _, p := range pb.PBPeersToPeerInfos(response.GetProviderPeers()) {
			select {
			case <-ctx.Done():
				log.Debug(ctx.Err())
				return
			case ch <- p:
			}
		}
	}()
	return ch
}

// FindPeer searches for a peer with given ID.
func (dht *IpfsDHT) FindPeer(ctx context.Context, id peer.ID) (peer.PeerInfo, error) {
	defer log.EventBegin(ctx, "FindPeer", id).Done()

	// Check if were already connected to them
	if pi := dht.FindLocal(id); pi.ID != "" {
		return pi, nil
	}

	peers := dht.routingTable.NearestPeers(kb.ConvertPeerID(id), AlphaValue)
	if len(peers) == 0 {
		return peer.PeerInfo{}, kb.ErrLookupFailure
	}

	// Sanity...
	for _, p := range peers {
		if p == id {
			log.Debug("Found target peer in list of closest peers...")
			return dht.peerstore.PeerInfo(p), nil
		}
	}

	// setup the Query
	parent := ctx
	query := dht.newQuery(key.Key(id), func(ctx context.Context, p peer.ID) (*dhtQueryResult, error) {
		notif.PublishQueryEvent(parent, &notif.QueryEvent{
			Type: notif.SendingQuery,
			ID:   p,
		})

		pmes, err := dht.findPeerSingle(ctx, p, id)
		if err != nil {
			return nil, err
		}

		closer := pmes.GetCloserPeers()
		clpeerInfos := pb.PBPeersToPeerInfos(closer)

		// see it we got the peer here
		for _, npi := range clpeerInfos {
			if npi.ID == id {
				return &dhtQueryResult{
					peer:    npi,
					success: true,
				}, nil
			}
		}

		notif.PublishQueryEvent(parent, &notif.QueryEvent{
			Type:      notif.PeerResponse,
			Responses: pointerizePeerInfos(clpeerInfos),
		})

		return &dhtQueryResult{closerPeers: clpeerInfos}, nil
	})

	// run it!
	result, err := query.Run(ctx, peers)
	if err != nil {
		return peer.PeerInfo{}, err
	}

	log.Debugf("FindPeer %v %v", id, result.success)
	if result.peer.ID == "" {
		return peer.PeerInfo{}, routing.ErrNotFound
	}

	return result.peer, nil
}

func (dht *IpfsDHT) findProvidersAsyncRoutine(ctx context.Context, key key.Key, count int, peerOut chan peer.PeerInfo) {
	defer log.EventBegin(ctx, "findProvidersAsync", &key).Done()
	defer close(peerOut)

	ps := pset.NewLimited(count)
	provs := dht.providers.GetProviders(ctx, key)
	for _, p := range provs {
		// NOTE: assuming that this list of peers is unique
		if ps.TryAdd(p) {
			select {
			case peerOut <- dht.peerstore.PeerInfo(p):
			case <-ctx.Done():
				return
			}
		}

		// If we have enough peers locally, dont bother with remote RPC
		if ps.Size() >= count {
			return
		}
	}

	// setup the Query
	parent := ctx
	query := dht.newQuery(key, func(ctx context.Context, p peer.ID) (*dhtQueryResult, error) {
		notif.PublishQueryEvent(parent, &notif.QueryEvent{
			Type: notif.SendingQuery,
			ID:   p,
		})
		pmes, err := dht.findProvidersSingle(ctx, p, key)
		if err != nil {
			return nil, err
		}

		log.Debugf("%d provider entries", len(pmes.GetProviderPeers()))
		provs := pb.PBPeersToPeerInfos(pmes.GetProviderPeers())
		log.Debugf("%d provider entries decoded", len(provs))

		// Add unique providers from request, up to 'count'
		for _, prov := range provs {
			log.Debugf("got provider: %s", prov)
			if ps.TryAdd(prov.ID) {
				log.Debugf("using provider: %s", prov)
				select {
				case peerOut <- prov:
				case <-ctx.Done():
					log.Debug("Context timed out sending more providers")
					return nil, ctx.Err()
				}
			}
			if ps.Size() >= count {
				log.Debugf("got enough providers (%d/%d)", ps.Size(), count)
				return &dhtQueryResult{success: true}, nil
			}
		}

		// Give closer peers back to the query to be queried
		closer := pmes.GetCloserPeers()
		clpeers := pb.PBPeersToPeerInfos(closer)
		log.Debugf("got closer peers: %d %s", len(clpeers), clpeers)

		notif.PublishQueryEvent(parent, &notif.QueryEvent{
			Type:      notif.PeerResponse,
			ID:        p,
			Responses: pointerizePeerInfos(clpeers),
		})
		return &dhtQueryResult{closerPeers: clpeers}, nil
	})

	peers := dht.routingTable.NearestPeers(kb.ConvertKey(key), AlphaValue)
	_, err := query.Run(ctx, peers)
	if err != nil {
		log.Debugf("Query error: %s", err)
		notif.PublishQueryEvent(ctx, &notif.QueryEvent{
			Type:  notif.QueryError,
			Extra: err.Error(),
		})
	}
}