merkledag_test.go 9.99 KB
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package merkledag_test
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import (
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	"bytes"
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	"context"
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	"errors"
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	"fmt"
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	"io"
	"io/ioutil"
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	"strings"
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	"sync"
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	"testing"
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	"time"
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	blocks "github.com/ipfs/go-ipfs/blocks"
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	bserv "github.com/ipfs/go-ipfs/blockservice"
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	bstest "github.com/ipfs/go-ipfs/blockservice/test"
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	offline "github.com/ipfs/go-ipfs/exchange/offline"
	imp "github.com/ipfs/go-ipfs/importer"
	chunk "github.com/ipfs/go-ipfs/importer/chunk"
	. "github.com/ipfs/go-ipfs/merkledag"
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	mdpb "github.com/ipfs/go-ipfs/merkledag/pb"
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	dstest "github.com/ipfs/go-ipfs/merkledag/test"
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	uio "github.com/ipfs/go-ipfs/unixfs/io"
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	node "gx/ipfs/QmRSU5EqqWVZSNdbU51yXmVoF1uNw3JgTNB6RaiL7DZM16/go-ipld-node"
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	u "gx/ipfs/Qmb912gdngC1UWwTkhuW8knyRbcWeu5kqkxBpveLmW8bSr/go-ipfs-util"
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	cid "gx/ipfs/QmcTcsTvfaeEBRFo1TkFgT8sRmgi1n1LTZpecfVP8fzpGD/go-cid"
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)

func TestNode(t *testing.T) {

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	n1 := NodeWithData([]byte("beep"))
	n2 := NodeWithData([]byte("boop"))
	n3 := NodeWithData([]byte("beep boop"))
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	if err := n3.AddNodeLink("beep-link", n1); err != nil {
		t.Error(err)
	}
	if err := n3.AddNodeLink("boop-link", n2); err != nil {
		t.Error(err)
	}

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	printn := func(name string, n *ProtoNode) {
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		fmt.Println(">", name)
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		fmt.Println("data:", string(n.Data()))
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		fmt.Println("links:")
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		for _, l := range n.Links() {
			fmt.Println("-", l.Name, l.Size, l.Cid)
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		}

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		e, err := n.EncodeProtobuf(false)
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		if err != nil {
			t.Error(err)
		} else {
			fmt.Println("encoded:", e)
		}

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		h := n.Multihash()
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		k := n.Cid().Hash()
		if k.String() != h.String() {
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			t.Error("Key is not equivalent to multihash")
		} else {
			fmt.Println("key: ", k)
		}
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		SubtestNodeStat(t, n)
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	}

	printn("beep", n1)
	printn("boop", n2)
	printn("beep boop", n3)
}
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func SubtestNodeStat(t *testing.T, n *ProtoNode) {
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	enc, err := n.EncodeProtobuf(true)
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	if err != nil {
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		t.Error("n.EncodeProtobuf(true) failed")
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		return
	}

	cumSize, err := n.Size()
	if err != nil {
		t.Error("n.Size() failed")
		return
	}

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	k := n.Cid()
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	expected := node.NodeStat{
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		NumLinks:       len(n.Links()),
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		BlockSize:      len(enc),
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		LinksSize:      len(enc) - len(n.Data()), // includes framing.
		DataSize:       len(n.Data()),
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		CumulativeSize: int(cumSize),
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		Hash:           k.String(),
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	}

	actual, err := n.Stat()
	if err != nil {
		t.Error("n.Stat() failed")
		return
	}

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	if expected != *actual {
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		t.Errorf("n.Stat incorrect.\nexpect: %s\nactual: %s", expected, actual)
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	} else {
		fmt.Printf("n.Stat correct: %s\n", actual)
	}
}

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type devZero struct{}

func (_ devZero) Read(b []byte) (int, error) {
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	for i := range b {
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		b[i] = 0
	}
	return len(b), nil
}

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func TestBatchFetch(t *testing.T) {
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	read := io.LimitReader(u.NewTimeSeededRand(), 1024*32)
	runBatchFetchTest(t, read)
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}
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func TestBatchFetchDupBlock(t *testing.T) {
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	read := io.LimitReader(devZero{}, 1024*32)
	runBatchFetchTest(t, read)
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}

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func runBatchFetchTest(t *testing.T, read io.Reader) {
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	ctx := context.Background()
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	var dagservs []DAGService
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	for _, bsi := range bstest.Mocks(5) {
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		dagservs = append(dagservs, NewDAGService(bsi))
	}
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	spl := chunk.NewSizeSplitter(read, 512)
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	root, err := imp.BuildDagFromReader(dagservs[0], spl)
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	if err != nil {
		t.Fatal(err)
	}

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	t.Log("finished setup.")

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	dagr, err := uio.NewDagReader(ctx, root, dagservs[0])
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	if err != nil {
		t.Fatal(err)
	}
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	expected, err := ioutil.ReadAll(dagr)
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	if err != nil {
		t.Fatal(err)
	}

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	_, err = dagservs[0].Add(root)
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	if err != nil {
		t.Fatal(err)
	}

	t.Log("Added file to first node.")

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	c := root.Cid()
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	wg := sync.WaitGroup{}
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	errs := make(chan error)

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	for i := 1; i < len(dagservs); i++ {
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		wg.Add(1)
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		go func(i int) {
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			defer wg.Done()
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			first, err := dagservs[i].Get(ctx, c)
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			if err != nil {
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				errs <- err
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			}
			fmt.Println("Got first node back.")

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			firstpb, ok := first.(*ProtoNode)
			if !ok {
				errs <- ErrNotProtobuf
			}

			read, err := uio.NewDagReader(ctx, firstpb, dagservs[i])
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			if err != nil {
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				errs <- err
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			}
			datagot, err := ioutil.ReadAll(read)
			if err != nil {
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				errs <- err
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			}

			if !bytes.Equal(datagot, expected) {
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				errs <- errors.New("Got bad data back!")
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			}
		}(i)
	}

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	go func() {
		wg.Wait()
		close(errs)
	}()

	for err := range errs {
		if err != nil {
			t.Fatal(err)
		}
	}
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}
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func assertCanGet(t *testing.T, ds DAGService, n node.Node) {
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	if _, err := ds.Get(context.Background(), n.Cid()); err != nil {
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		t.Fatal(err)
	}
}

func TestCantGet(t *testing.T) {
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	ds := dstest.Mock()
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	a := NodeWithData([]byte("A"))
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	c := a.Cid()
	_, err := ds.Get(context.Background(), c)
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	if !strings.Contains(err.Error(), "not found") {
		t.Fatal("expected err not found, got: ", err)
	}
}
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func TestFetchGraph(t *testing.T) {
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	var dservs []DAGService
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	bsis := bstest.Mocks(2)
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	for _, bsi := range bsis {
		dservs = append(dservs, NewDAGService(bsi))
	}
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	read := io.LimitReader(u.NewTimeSeededRand(), 1024*32)
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	root, err := imp.BuildDagFromReader(dservs[0], chunk.NewSizeSplitter(read, 512))
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	if err != nil {
		t.Fatal(err)
	}

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	err = FetchGraph(context.TODO(), root.Cid(), dservs[1])
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	if err != nil {
		t.Fatal(err)
	}

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	// create an offline dagstore and ensure all blocks were fetched
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	bs := bserv.New(bsis[1].Blockstore(), offline.Exchange(bsis[1].Blockstore()))
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	offline_ds := NewDAGService(bs)

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	err = EnumerateChildren(context.Background(), offline_ds, root.Cid(), func(_ *cid.Cid) bool { return true }, false)
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	if err != nil {
		t.Fatal(err)
	}
}

func TestEnumerateChildren(t *testing.T) {
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	bsi := bstest.Mocks(1)
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	ds := NewDAGService(bsi[0])

	read := io.LimitReader(u.NewTimeSeededRand(), 1024*1024)
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	root, err := imp.BuildDagFromReader(ds, chunk.NewSizeSplitter(read, 512))
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	if err != nil {
		t.Fatal(err)
	}

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	set := cid.NewSet()
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	err = EnumerateChildren(context.Background(), ds, root.Cid(), set.Visit, false)
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	if err != nil {
		t.Fatal(err)
	}

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	var traverse func(n node.Node)
	traverse = func(n node.Node) {
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		// traverse dag and check
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		for _, lnk := range n.Links() {
			c := lnk.Cid
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			if !set.Has(c) {
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				t.Fatal("missing key in set! ", lnk.Cid.String())
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			}
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			child, err := ds.Get(context.Background(), c)
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			if err != nil {
				t.Fatal(err)
			}
			traverse(child)
		}
	}

	traverse(root)
}
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func TestFetchFailure(t *testing.T) {
	ds := dstest.Mock()
	ds_bad := dstest.Mock()

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	top := new(ProtoNode)
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	for i := 0; i < 10; i++ {
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		nd := NodeWithData([]byte{byte('a' + i)})
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		_, err := ds.Add(nd)
		if err != nil {
			t.Fatal(err)
		}

		err = top.AddNodeLinkClean(fmt.Sprintf("AA%d", i), nd)
		if err != nil {
			t.Fatal(err)
		}
	}

	for i := 0; i < 10; i++ {
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		nd := NodeWithData([]byte{'f', 'a' + byte(i)})
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		_, err := ds_bad.Add(nd)
		if err != nil {
			t.Fatal(err)
		}

		err = top.AddNodeLinkClean(fmt.Sprintf("BB%d", i), nd)
		if err != nil {
			t.Fatal(err)
		}
	}

	getters := GetDAG(context.Background(), ds, top)
	for i, getter := range getters {
		_, err := getter.Get(context.Background())
		if err != nil && i < 10 {
			t.Fatal(err)
		}
		if err == nil && i >= 10 {
			t.Fatal("should have failed request")
		}
	}
}
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func TestUnmarshalFailure(t *testing.T) {
	badData := []byte("hello world")

	_, err := DecodeProtobuf(badData)
	if err == nil {
		t.Fatal("shouldnt succeed to parse this")
	}

	// now with a bad link
	pbn := &mdpb.PBNode{Links: []*mdpb.PBLink{{Hash: []byte("not a multihash")}}}
	badlink, err := pbn.Marshal()
	if err != nil {
		t.Fatal(err)
	}

	_, err = DecodeProtobuf(badlink)
	if err == nil {
		t.Fatal("should have failed to parse node with bad link")
	}

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	n := &ProtoNode{}
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	n.Marshal()
}
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func TestBasicAddGet(t *testing.T) {
	ds := dstest.Mock()
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	nd := new(ProtoNode)
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	c, err := ds.Add(nd)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ds.Get(context.Background(), c)
	if err != nil {
		t.Fatal(err)
	}

	if !nd.Cid().Equals(out.Cid()) {
		t.Fatal("output didnt match input")
	}
}
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func TestGetRawNodes(t *testing.T) {
	rn := NewRawNode([]byte("test"))

	ds := dstest.Mock()

	c, err := ds.Add(rn)
	if err != nil {
		t.Fatal(err)
	}

	if !c.Equals(rn.Cid()) {
		t.Fatal("output cids didnt match")
	}

	out, err := ds.Get(context.TODO(), c)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(out.RawData(), []byte("test")) {
		t.Fatal("raw block should match input data")
	}

	if out.Links() != nil {
		t.Fatal("raw blocks shouldnt have links")
	}

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	if out.Tree("", -1) != nil {
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		t.Fatal("tree should return no paths in a raw block")
	}

	size, err := out.Size()
	if err != nil {
		t.Fatal(err)
	}
	if size != 4 {
		t.Fatal("expected size to be 4")
	}

	ns, err := out.Stat()
	if err != nil {
		t.Fatal(err)
	}

	if ns.DataSize != 4 {
		t.Fatal("expected size to be 4, got: ", ns.DataSize)
	}

	_, _, err = out.Resolve([]string{"foo"})
	if err != ErrLinkNotFound {
		t.Fatal("shouldnt find links under raw blocks")
	}
}

func TestProtoNodeResolve(t *testing.T) {

	nd := new(ProtoNode)
	nd.SetLinks([]*node.Link{{Name: "foo"}})

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	lnk, left, err := nd.ResolveLink([]string{"foo", "bar"})
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	if err != nil {
		t.Fatal(err)
	}

	if len(left) != 1 || left[0] != "bar" {
		t.Fatal("expected the single path element 'bar' to remain")
	}

	if lnk.Name != "foo" {
		t.Fatal("how did we get anything else?")
	}

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	tvals := nd.Tree("", -1)
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	if len(tvals) != 1 || tvals[0] != "foo" {
		t.Fatal("expected tree to return []{\"foo\"}")
	}
}
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func TestCidRetention(t *testing.T) {
	nd := new(ProtoNode)
	nd.SetData([]byte("fooooo"))

	pref := nd.Cid().Prefix()
	pref.Version = 1

	c2, err := pref.Sum(nd.RawData())
	if err != nil {
		t.Fatal(err)
	}

	blk, err := blocks.NewBlockWithCid(nd.RawData(), c2)
	if err != nil {
		t.Fatal(err)
	}

	bs := dstest.Bserv()
	_, err = bs.AddBlock(blk)
	if err != nil {
		t.Fatal(err)
	}

	ds := NewDAGService(bs)
	out, err := ds.Get(context.Background(), c2)
	if err != nil {
		t.Fatal(err)
	}

	if !out.Cid().Equals(c2) {
		t.Fatal("output cid didnt match")
	}
}
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func TestCidRawDoesnNeedData(t *testing.T) {
	srv := NewDAGService(dstest.Bserv())
	nd := NewRawNode([]byte("somedata"))

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	// there is no data for this node in the blockservice
	// so dag service can't load it
	links, err := srv.GetLinks(ctx, nd.Cid())
	if err != nil {
		t.Fatal(err)
	}
	if len(links) != 0 {
		t.Fatal("raw node shouldn't have any links")
	}
}