Example #1
0
// peerWantsBlock will check if we have the block in question,
// and then if we do, check the ledger for whether or not we should send it.
func (bs *BitSwap) peerWantsBlock(p *peer.Peer, want string) {
	u.DOut("peer [%s] wants block [%s]\n", p.ID.Pretty(), u.Key(want).Pretty())
	ledger := bs.getLedger(p)

	dsk := ds.NewKey(want)
	blk_i, err := bs.datastore.Get(dsk)
	if err != nil {
		if err == ds.ErrNotFound {
			ledger.Wants(u.Key(want))
		}
		u.PErr("datastore get error: %v\n", err)
		return
	}

	blk, ok := blk_i.([]byte)
	if !ok {
		u.PErr("data conversion error.\n")
		return
	}

	if ledger.ShouldSend() {
		u.DOut("Sending block to peer.\n")
		bblk, err := blocks.NewBlock(blk)
		if err != nil {
			u.PErr("newBlock error: %v\n", err)
			return
		}
		bs.SendBlock(p, bblk)
		ledger.SentBytes(len(blk))
	} else {
		u.DOut("Decided not to send block.")
	}
}
Example #2
0
// GetBlock retrieves a particular block from the service,
// Getting it from the datastore using the key (hash).
func (s *BlockService) GetBlock(k u.Key) (*blocks.Block, error) {
	u.DOut("BlockService GetBlock: '%s'\n", k.Pretty())
	dsk := ds.NewKey(string(k))
	datai, err := s.Datastore.Get(dsk)
	if err == nil {
		u.DOut("Blockservice: Got data in datastore.\n")
		bdata, ok := datai.([]byte)
		if !ok {
			return nil, fmt.Errorf("data associated with %s is not a []byte", k)
		}
		return &blocks.Block{
			Multihash: mh.Multihash(k),
			Data:      bdata,
		}, nil
	} else if err == ds.ErrNotFound && s.Remote != nil {
		u.DOut("Blockservice: Searching bitswap.\n")
		blk, err := s.Remote.GetBlock(k, time.Second*5)
		if err != nil {
			return nil, err
		}
		return blk, nil
	} else {
		u.DOut("Blockservice GetBlock: Not found.\n")
		return nil, u.ErrNotFound
	}
}
Example #3
0
func (d *Datastore) KeyList() ([]ds.Key, error) {
	i := d.DB.NewIterator(nil, nil)
	var keys []ds.Key
	for ; i.Valid(); i.Next() {
		keys = append(keys, ds.NewKey(string(i.Key())))
	}
	return keys, nil
}
Example #4
0
func (dht *IpfsDHT) handleGetValue(p *peer.Peer, pmes *PBDHTMessage) {
	u.DOut("handleGetValue for key: %s\n", pmes.GetKey())
	dskey := ds.NewKey(pmes.GetKey())
	resp := &Message{
		Response: true,
		ID:       pmes.GetId(),
		Key:      pmes.GetKey(),
	}
	iVal, err := dht.datastore.Get(dskey)
	if err == nil {
		u.DOut("handleGetValue success!\n")
		resp.Success = true
		resp.Value = iVal.([]byte)
	} else if err == ds.ErrNotFound {
		// Check if we know any providers for the requested value
		provs := dht.providers.GetProviders(u.Key(pmes.GetKey()))
		if len(provs) > 0 {
			u.DOut("handleGetValue returning %d provider[s]\n", len(provs))
			resp.Peers = provs
			resp.Success = true
		} else {
			// No providers?
			// Find closest peer on given cluster to desired key and reply with that info

			level := 0
			if len(pmes.GetValue()) < 1 {
				// TODO: maybe return an error? Defaulting isnt a good idea IMO
				u.PErr("handleGetValue: no routing level specified, assuming 0\n")
			} else {
				level = int(pmes.GetValue()[0]) // Using value field to specify cluster level
			}
			u.DOut("handleGetValue searching level %d clusters\n", level)

			closer := dht.routingTables[level].NearestPeer(kb.ConvertKey(u.Key(pmes.GetKey())))

			if closer.ID.Equal(dht.self.ID) {
				u.DOut("Attempted to return self! this shouldnt happen...\n")
				resp.Peers = nil
				goto out
			}
			// If this peer is closer than the one from the table, return nil
			if kb.Closer(dht.self.ID, closer.ID, u.Key(pmes.GetKey())) {
				resp.Peers = nil
				u.DOut("handleGetValue could not find a closer node than myself.\n")
			} else {
				u.DOut("handleGetValue returning a closer peer: '%s'\n", closer.ID.Pretty())
				resp.Peers = []*peer.Peer{closer}
			}
		}
	} else {
		//temp: what other errors can a datastore return?
		panic(err)
	}

out:
	mes := swarm.NewMessage(p, resp.ToProtobuf())
	dht.netChan.Outgoing <- mes
}
Example #5
0
func (dht *IpfsDHT) getLocal(key u.Key) ([]byte, error) {
	dht.dslock.Lock()
	defer dht.dslock.Unlock()
	v, err := dht.datastore.Get(ds.NewKey(string(key)))
	if err != nil {
		return nil, err
	}
	return v.([]byte), nil
}
Example #6
0
// Store a value in this peer local storage
func (dht *IpfsDHT) handlePutValue(p *peer.Peer, pmes *PBDHTMessage) {
	dht.dslock.Lock()
	defer dht.dslock.Unlock()
	dskey := ds.NewKey(pmes.GetKey())
	err := dht.datastore.Put(dskey, pmes.GetValue())
	if err != nil {
		// For now, just panic, handle this better later maybe
		panic(err)
	}
}
Example #7
0
// AddBlock adds a particular block to the service, Putting it into the datastore.
func (s *BlockService) AddBlock(b *blocks.Block) (u.Key, error) {
	k := b.Key()
	dsk := ds.NewKey(string(k))
	u.DOut("storing [%s] in datastore\n", k.Pretty())
	err := s.Datastore.Put(dsk, b.Data)
	if err != nil {
		return k, err
	}
	if s.Remote != nil {
		err = s.Remote.HaveBlock(b)
	}
	return k, err
}
Example #8
0
func (bs *BitSwap) blockReceive(p *peer.Peer, blk *blocks.Block) {
	u.DOut("blockReceive: %s\n", blk.Key().Pretty())
	err := bs.datastore.Put(ds.NewKey(string(blk.Key())), blk.Data)
	if err != nil {
		u.PErr("blockReceive error: %v\n", err)
		return
	}

	mes := &swarm.Message{
		Peer: p,
		Data: blk.Data,
	}
	bs.listener.Respond(string(blk.Key()), mes)

	ledger := bs.getLedger(p)
	ledger.ReceivedBytes(len(blk.Data))
}
Example #9
0
func (dht *IpfsDHT) handleGetProviders(p *peer.Peer, pmes *PBDHTMessage) {
	resp := Message{
		Type:     PBDHTMessage_GET_PROVIDERS,
		Key:      pmes.GetKey(),
		ID:       pmes.GetId(),
		Response: true,
	}

	has, err := dht.datastore.Has(ds.NewKey(pmes.GetKey()))
	if err != nil {
		dht.netChan.Errors <- err
	}

	providers := dht.providers.GetProviders(u.Key(pmes.GetKey()))
	if has {
		providers = append(providers, dht.self)
	}
	if providers == nil || len(providers) == 0 {
		level := 0
		if len(pmes.GetValue()) > 0 {
			level = int(pmes.GetValue()[0])
		}

		closer := dht.routingTables[level].NearestPeer(kb.ConvertKey(u.Key(pmes.GetKey())))
		if kb.Closer(dht.self.ID, closer.ID, u.Key(pmes.GetKey())) {
			resp.Peers = nil
		} else {
			resp.Peers = []*peer.Peer{closer}
		}
	} else {
		resp.Peers = providers
		resp.Success = true
	}

	mes := swarm.NewMessage(p, resp.ToProtobuf())
	dht.netChan.Outgoing <- mes
}
Example #10
0
func (dht *IpfsDHT) putLocal(key u.Key, value []byte) error {
	return dht.datastore.Put(ds.NewKey(string(key)), value)
}