Exemplo n.º 1
0
// GetBlock attempts to retrieve a particular block from peers, within timeout.
func (bs *BitSwap) GetBlock(k u.Key, timeout time.Duration) (
	*blocks.Block, error) {
	u.DOut("Bitswap GetBlock: '%s'\n", k.Pretty())
	begin := time.Now()
	tleft := timeout - time.Now().Sub(begin)
	provs_ch := bs.routing.FindProvidersAsync(k, 20, timeout)

	valchan := make(chan []byte)
	after := time.After(tleft)

	// TODO: when the data is received, shut down this for loop ASAP
	go func() {
		for p := range provs_ch {
			go func(pr *peer.Peer) {
				blk, err := bs.getBlock(k, pr, tleft)
				if err != nil {
					u.PErr("getBlock returned: %v\n", err)
					return
				}
				select {
				case valchan <- blk:
				default:
				}
			}(p)
		}
	}()

	select {
	case blkdata := <-valchan:
		close(valchan)
		return blocks.NewBlock(blkdata)
	case <-after:
		return nil, u.ErrTimeout
	}
}
Exemplo n.º 2
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.")
	}
}
Exemplo n.º 3
0
func (bs *BitSwap) handleMessages() {
	for {
		select {
		case mes := <-bs.meschan.Incoming:
			pmes := new(PBMessage)
			err := proto.Unmarshal(mes.Data, pmes)
			if err != nil {
				u.PErr("%v\n", err)
				continue
			}
			if pmes.Blocks != nil {
				for _, blkData := range pmes.Blocks {
					blk, err := blocks.NewBlock(blkData)
					if err != nil {
						u.PErr("%v\n", err)
						continue
					}
					go bs.blockReceive(mes.Peer, blk)
				}
			}

			if pmes.Wantlist != nil {
				for _, want := range pmes.Wantlist {
					go bs.peerWantsBlock(mes.Peer, want)
				}
			}
		case <-bs.haltChan:
			return
		}
	}
}
Exemplo n.º 4
0
func TestBlocks(t *testing.T) {
	d := ds.NewMapDatastore()
	bs, err := NewBlockService(d, nil)
	if err != nil {
		t.Error("failed to construct block service", err)
		return
	}

	b, err := blocks.NewBlock([]byte("beep boop"))
	if err != nil {
		t.Error("failed to construct block", err)
		return
	}

	h, err := u.Hash([]byte("beep boop"))
	if err != nil {
		t.Error("failed to hash data", err)
		return
	}

	if !bytes.Equal(b.Multihash, h) {
		t.Error("Block Multihash and data multihash not equal")
	}

	if b.Key() != u.Key(h) {
		t.Error("Block key and data multihash key not equal")
	}

	k, err := bs.AddBlock(b)
	if err != nil {
		t.Error("failed to add block to BlockService", err)
		return
	}

	if k != b.Key() {
		t.Error("returned key is not equal to block key", err)
	}

	b2, err := bs.GetBlock(b.Key())
	if err != nil {
		t.Error("failed to retrieve block from BlockService", err)
		return
	}

	if b.Key() != b2.Key() {
		t.Error("Block keys not equal.")
	}

	if !bytes.Equal(b.Data, b2.Data) {
		t.Error("Block data is not equal.")
	}
}
Exemplo n.º 5
0
// Put adds a node to the DAGService, storing the block in the BlockService
func (n *DAGService) Put(nd *Node) (u.Key, error) {
	if n == nil {
		return "", fmt.Errorf("DAGService is nil")
	}

	d, err := nd.Encoded(false)
	if err != nil {
		return "", err
	}

	b, err := blocks.NewBlock(d)
	if err != nil {
		return "", err
	}

	return n.Blocks.AddBlock(b)
}
Exemplo n.º 6
0
// Add adds a node to the DAGService, storing the block in the BlockService
func (n *DAGService) Add(nd *Node) (u.Key, error) {
	k, _ := nd.Key()
	u.DOut("DagService Add [%s]\n", k.Pretty())
	if n == nil {
		return "", fmt.Errorf("DAGService is nil")
	}

	d, err := nd.Encoded(false)
	if err != nil {
		return "", err
	}

	b, err := blocks.NewBlock(d)
	if err != nil {
		return "", err
	}

	return n.Blocks.AddBlock(b)
}
Exemplo n.º 7
0
func TestAppendBlock(t *testing.T) {

	strs := make([]string, 2)
	strs = append(strs, "Celeritas")
	strs = append(strs, "Incendia")

	m := newMessage()
	for _, str := range strs {
		block, err := blocks.NewBlock([]byte(str))
		if err != nil {
			t.Fail()
		}
		m.AppendBlock(block)
	}

	// assert strings are in proto message
	for _, blockbytes := range m.ToProto().GetBlocks() {
		s := bytes.NewBuffer(blockbytes).String()
		if !contains(strs, s) {
			t.Fail()
		}
	}
}