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merkledag_test.go
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merkledag_test.go
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package merkledag_test
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"strings"
"sync"
"testing"
"time"
. "github.com/dms3-fs/go-merkledag"
mdpb "github.com/dms3-fs/go-merkledag/pb"
dstest "github.com/dms3-fs/go-merkledag/test"
blocks "github.com/dms3-fs/go-block-format"
bserv "github.com/dms3-fs/go-blockservice"
bstest "github.com/dms3-fs/go-blockservice/test"
cid "github.com/dms3-fs/go-cid"
offline "github.com/dms3-fs/go-fs-exchange-offline"
u "github.com/dms3-fs/go-fs-util"
dms3ld "github.com/dms3-fs/go-ld-format"
)
// makeDepthTestingGraph makes a small DAG with two levels. The level-two
// nodes are both children of the root and of one of the level 1 nodes.
// This is meant to test the EnumerateChildren*Depth functions.
func makeDepthTestingGraph(t *testing.T, ds dms3ld.DAGService) dms3ld.Node {
root := NodeWithData(nil)
l11 := NodeWithData([]byte("leve1_node1"))
l12 := NodeWithData([]byte("leve1_node2"))
l21 := NodeWithData([]byte("leve2_node1"))
l22 := NodeWithData([]byte("leve2_node2"))
l23 := NodeWithData([]byte("leve2_node3"))
l11.AddNodeLink(l21.Cid().String(), l21)
l11.AddNodeLink(l22.Cid().String(), l22)
l11.AddNodeLink(l23.Cid().String(), l23)
root.AddNodeLink(l11.Cid().String(), l11)
root.AddNodeLink(l12.Cid().String(), l12)
root.AddNodeLink(l23.Cid().String(), l23)
ctx := context.Background()
for _, n := range []dms3ld.Node{l23, l22, l21, l12, l11, root} {
err := ds.Add(ctx, n)
if err != nil {
t.Fatal(err)
}
}
return root
}
// Check that all children of root are in the given set and in the datastore
func traverseAndCheck(t *testing.T, root dms3ld.Node, ds dms3ld.DAGService, hasF func(c *cid.Cid) bool) {
// traverse dag and check
for _, lnk := range root.Links() {
c := lnk.Cid
if !hasF(c) {
t.Fatal("missing key in set! ", lnk.Cid.String())
}
child, err := ds.Get(context.Background(), c)
if err != nil {
t.Fatal(err)
}
traverseAndCheck(t, child, ds, hasF)
}
}
func TestNode(t *testing.T) {
n1 := NodeWithData([]byte("beep"))
n2 := NodeWithData([]byte("boop"))
n3 := NodeWithData([]byte("beep boop"))
if err := n3.AddNodeLink("beep-link", n1); err != nil {
t.Error(err)
}
if err := n3.AddNodeLink("boop-link", n2); err != nil {
t.Error(err)
}
printn := func(name string, n *ProtoNode) {
fmt.Println(">", name)
fmt.Println("data:", string(n.Data()))
fmt.Println("links:")
for _, l := range n.Links() {
fmt.Println("-", l.Name, l.Size, l.Cid)
}
e, err := n.EncodeProtobuf(false)
if err != nil {
t.Error(err)
} else {
fmt.Println("encoded:", e)
}
h := n.Multihash()
k := n.Cid().Hash()
if k.String() != h.String() {
t.Error("Key is not equivalent to multihash")
} else {
fmt.Println("key: ", k)
}
SubtestNodeStat(t, n)
}
printn("beep", n1)
printn("boop", n2)
printn("beep boop", n3)
}
func SubtestNodeStat(t *testing.T, n *ProtoNode) {
enc, err := n.EncodeProtobuf(true)
if err != nil {
t.Error("n.EncodeProtobuf(true) failed")
return
}
cumSize, err := n.Size()
if err != nil {
t.Error("n.Size() failed")
return
}
k := n.Cid()
expected := dms3ld.NodeStat{
NumLinks: len(n.Links()),
BlockSize: len(enc),
LinksSize: len(enc) - len(n.Data()), // includes framing.
DataSize: len(n.Data()),
CumulativeSize: int(cumSize),
Hash: k.String(),
}
actual, err := n.Stat()
if err != nil {
t.Error("n.Stat() failed")
return
}
if expected != *actual {
t.Errorf("n.Stat incorrect.\nexpect: %s\nactual: %s", expected, actual)
} else {
fmt.Printf("n.Stat correct: %s\n", actual)
}
}
type devZero struct{}
func (_ devZero) Read(b []byte) (int, error) {
for i := range b {
b[i] = 0
}
return len(b), nil
}
func TestBatchFetch(t *testing.T) {
read := io.LimitReader(u.NewTimeSeededRand(), 1024*32)
runBatchFetchTest(t, read)
}
func TestBatchFetchDupBlock(t *testing.T) {
read := io.LimitReader(devZero{}, 1024*32)
runBatchFetchTest(t, read)
}
// makeTestDAG creates a simple DAG from the data in a reader.
// First, a node is created from each 512 bytes of data from the reader
// (like a the Size chunker would do). Then all nodes are added as children
// to a root node, which is returned.
func makeTestDAG(t *testing.T, read io.Reader, ds dms3ld.DAGService) dms3ld.Node {
p := make([]byte, 512)
nodes := []*ProtoNode{}
for {
n, err := io.ReadFull(read, p)
if err == io.EOF {
break
}
if err != nil {
t.Fatal(err)
}
if n != len(p) {
t.Fatal("should have read 512 bytes from the reader")
}
protoNode := NodeWithData(p)
nodes = append(nodes, protoNode)
}
ctx := context.Background()
// Add a root referencing all created nodes
root := NodeWithData(nil)
for _, n := range nodes {
root.AddNodeLink(n.Cid().String(), n)
err := ds.Add(ctx, n)
if err != nil {
t.Fatal(err)
}
}
err := ds.Add(ctx, root)
if err != nil {
t.Fatal(err)
}
return root
}
// makeTestDAGReader takes the root node as returned by makeTestDAG and
// provides a reader that reads all the RawData from that node and its children.
func makeTestDAGReader(t *testing.T, root dms3ld.Node, ds dms3ld.DAGService) io.Reader {
ctx := context.Background()
buf := new(bytes.Buffer)
buf.Write(root.RawData())
for _, l := range root.Links() {
n, err := ds.Get(ctx, l.Cid)
if err != nil {
t.Fatal(err)
}
_, err = buf.Write(n.RawData())
if err != nil {
t.Fatal(err)
}
}
return buf
}
func runBatchFetchTest(t *testing.T, read io.Reader) {
ctx := context.Background()
var dagservs []dms3ld.DAGService
for _, bsi := range bstest.Mocks(5) {
dagservs = append(dagservs, NewDAGService(bsi))
}
root := makeTestDAG(t, read, dagservs[0])
t.Log("finished setup.")
dagr := makeTestDAGReader(t, root, dagservs[0])
expected, err := ioutil.ReadAll(dagr)
if err != nil {
t.Fatal(err)
}
err = dagservs[0].Add(ctx, root)
if err != nil {
t.Fatal(err)
}
t.Log("Added file to first node.")
c := root.Cid()
wg := sync.WaitGroup{}
errs := make(chan error)
for i := 1; i < len(dagservs); i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
first, err := dagservs[i].Get(ctx, c)
if err != nil {
errs <- err
}
fmt.Println("Got first node back.")
firstpb, ok := first.(*ProtoNode)
if !ok {
errs <- ErrNotProtobuf
}
read := makeTestDAGReader(t, firstpb, dagservs[i])
datagot, err := ioutil.ReadAll(read)
if err != nil {
errs <- err
}
if !bytes.Equal(datagot, expected) {
errs <- errors.New("got bad data back")
}
}(i)
}
go func() {
wg.Wait()
close(errs)
}()
for err := range errs {
if err != nil {
t.Fatal(err)
}
}
}
func TestCantGet(t *testing.T) {
ds := dstest.Mock()
a := NodeWithData([]byte("A"))
c := a.Cid()
_, err := ds.Get(context.Background(), c)
if !strings.Contains(err.Error(), "not found") {
t.Fatal("expected err not found, got: ", err)
}
}
func TestFetchGraph(t *testing.T) {
var dservs []dms3ld.DAGService
bsis := bstest.Mocks(2)
for _, bsi := range bsis {
dservs = append(dservs, NewDAGService(bsi))
}
read := io.LimitReader(u.NewTimeSeededRand(), 1024*32)
root := makeTestDAG(t, read, dservs[0])
err := FetchGraph(context.TODO(), root.Cid(), dservs[1])
if err != nil {
t.Fatal(err)
}
// create an offline dagstore and ensure all blocks were fetched
bs := bserv.New(bsis[1].Blockstore(), offline.Exchange(bsis[1].Blockstore()))
offlineDS := NewDAGService(bs)
err = EnumerateChildren(context.Background(), offlineDS.GetLinks, root.Cid(), func(_ *cid.Cid) bool { return true })
if err != nil {
t.Fatal(err)
}
}
func TestFetchGraphWithDepthLimit(t *testing.T) {
type testcase struct {
depthLim int
setLen int
}
tests := []testcase{
testcase{1, 3},
testcase{0, 0},
testcase{-1, 5},
testcase{2, 5},
testcase{3, 5},
}
testF := func(t *testing.T, tc testcase) {
var dservs []dms3ld.DAGService
bsis := bstest.Mocks(2)
for _, bsi := range bsis {
dservs = append(dservs, NewDAGService(bsi))
}
root := makeDepthTestingGraph(t, dservs[0])
err := FetchGraphWithDepthLimit(context.TODO(), root.Cid(), tc.depthLim, dservs[1])
if err != nil {
t.Fatal(err)
}
// create an offline dagstore and ensure all blocks were fetched
bs := bserv.New(bsis[1].Blockstore(), offline.Exchange(bsis[1].Blockstore()))
offlineDS := NewDAGService(bs)
set := make(map[string]int)
visitF := func(c *cid.Cid, depth int) bool {
if tc.depthLim < 0 || depth <= tc.depthLim {
set[string(c.Bytes())] = depth
return true
}
return false
}
err = EnumerateChildrenDepth(context.Background(), offlineDS.GetLinks, root.Cid(), 0, visitF)
if err != nil {
t.Fatal(err)
}
if len(set) != tc.setLen {
t.Fatalf("expected %d nodes but visited %d", tc.setLen, len(set))
}
}
for _, tc := range tests {
t.Run(fmt.Sprintf("depth limit %d", tc.depthLim), func(t *testing.T) {
testF(t, tc)
})
}
}
func TestEnumerateChildren(t *testing.T) {
bsi := bstest.Mocks(1)
ds := NewDAGService(bsi[0])
read := io.LimitReader(u.NewTimeSeededRand(), 1024*1024)
root := makeTestDAG(t, read, ds)
set := cid.NewSet()
err := EnumerateChildren(context.Background(), ds.GetLinks, root.Cid(), set.Visit)
if err != nil {
t.Fatal(err)
}
traverseAndCheck(t, root, ds, set.Has)
}
func TestFetchFailure(t *testing.T) {
ctx := context.Background()
ds := dstest.Mock()
ds_bad := dstest.Mock()
top := new(ProtoNode)
for i := 0; i < 10; i++ {
nd := NodeWithData([]byte{byte('a' + i)})
err := ds.Add(ctx, nd)
if err != nil {
t.Fatal(err)
}
err = top.AddNodeLink(fmt.Sprintf("AA%d", i), nd)
if err != nil {
t.Fatal(err)
}
}
for i := 0; i < 10; i++ {
nd := NodeWithData([]byte{'f', 'a' + byte(i)})
err := ds_bad.Add(ctx, nd)
if err != nil {
t.Fatal(err)
}
err = top.AddNodeLink(fmt.Sprintf("BB%d", i), nd)
if err != nil {
t.Fatal(err)
}
}
getters := dms3ld.GetDAG(ctx, ds, top)
for i, getter := range getters {
_, err := getter.Get(ctx)
if err != nil && i < 10 {
t.Fatal(err)
}
if err == nil && i >= 10 {
t.Fatal("should have failed request")
}
}
}
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")
}
n := &ProtoNode{}
n.Marshal()
}
func TestBasicAddGet(t *testing.T) {
ctx := context.Background()
ds := dstest.Mock()
nd := new(ProtoNode)
err := ds.Add(ctx, nd)
if err != nil {
t.Fatal(err)
}
out, err := ds.Get(ctx, nd.Cid())
if err != nil {
t.Fatal(err)
}
if !nd.Cid().Equals(out.Cid()) {
t.Fatal("output didnt match input")
}
}
func TestGetRawNodes(t *testing.T) {
ctx := context.Background()
rn := NewRawNode([]byte("test"))
ds := dstest.Mock()
err := ds.Add(ctx, rn)
if err != nil {
t.Fatal(err)
}
if !rn.Cid().Equals(rn.Cid()) {
t.Fatal("output cids didnt match")
}
out, err := ds.Get(ctx, rn.Cid())
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")
}
if out.Tree("", -1) != nil {
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([]*dms3ld.Link{{Name: "foo"}})
lnk, left, err := nd.ResolveLink([]string{"foo", "bar"})
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?")
}
tvals := nd.Tree("", -1)
if len(tvals) != 1 || tvals[0] != "foo" {
t.Fatal("expected tree to return []{\"foo\"}")
}
}
func TestCidRetention(t *testing.T) {
ctx := context.Background()
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(ctx, c2)
if err != nil {
t.Fatal(err)
}
if !out.Cid().Equals(c2) {
t.Fatal("output cid didnt match")
}
}
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")
}
}
func TestGetManyDuplicate(t *testing.T) {
ctx := context.Background()
srv := NewDAGService(dstest.Bserv())
nd := NodeWithData([]byte("foo"))
if err := srv.Add(ctx, nd); err != nil {
t.Fatal(err)
}
nds := srv.GetMany(ctx, []*cid.Cid{nd.Cid(), nd.Cid(), nd.Cid()})
out, ok := <-nds
if !ok {
t.Fatal("expecting node foo")
}
if out.Err != nil {
t.Fatal(out.Err)
}
if !out.Node.Cid().Equals(nd.Cid()) {
t.Fatal("got wrong node")
}
out, ok = <-nds
if ok {
if out.Err != nil {
t.Fatal(out.Err)
} else {
t.Fatal("expecting no more nodes")
}
}
}
func TestEnumerateAsyncFailsNotFound(t *testing.T) {
ctx := context.Background()
a := NodeWithData([]byte("foo1"))
b := NodeWithData([]byte("foo2"))
c := NodeWithData([]byte("foo3"))
d := NodeWithData([]byte("foo4"))
ds := dstest.Mock()
for _, n := range []dms3ld.Node{a, b, c} {
err := ds.Add(ctx, n)
if err != nil {
t.Fatal(err)
}
}
parent := new(ProtoNode)
if err := parent.AddNodeLink("a", a); err != nil {
t.Fatal(err)
}
if err := parent.AddNodeLink("b", b); err != nil {
t.Fatal(err)
}
if err := parent.AddNodeLink("c", c); err != nil {
t.Fatal(err)
}
if err := parent.AddNodeLink("d", d); err != nil {
t.Fatal(err)
}
err := ds.Add(ctx, parent)
if err != nil {
t.Fatal(err)
}
cset := cid.NewSet()
err = EnumerateChildrenAsync(ctx, GetLinksDirect(ds), parent.Cid(), cset.Visit)
if err == nil {
t.Fatal("this should have failed")
}
}
func TestProgressIndicator(t *testing.T) {
testProgressIndicator(t, 5)
}
func TestProgressIndicatorNoChildren(t *testing.T) {
testProgressIndicator(t, 0)
}
func testProgressIndicator(t *testing.T, depth int) {
ds := dstest.Mock()
top, numChildren := mkDag(ds, depth)
v := new(ProgressTracker)
ctx := v.DeriveContext(context.Background())
err := FetchGraph(ctx, top, ds)
if err != nil {
t.Fatal(err)
}
if v.Value() != numChildren+1 {
t.Errorf("wrong number of children reported in progress indicator, expected %d, got %d",
numChildren+1, v.Value())
}
}
func mkDag(ds dms3ld.DAGService, depth int) (*cid.Cid, int) {
ctx := context.Background()
totalChildren := 0
f := func() *ProtoNode {
p := new(ProtoNode)
buf := make([]byte, 16)
rand.Read(buf)
p.SetData(buf)
err := ds.Add(ctx, p)
if err != nil {
panic(err)
}
return p
}
for i := 0; i < depth; i++ {
thisf := f
f = func() *ProtoNode {
pn := mkNodeWithChildren(thisf, 10)
err := ds.Add(ctx, pn)
if err != nil {
panic(err)
}
totalChildren += 10
return pn
}
}
nd := f()
err := ds.Add(ctx, nd)
if err != nil {
panic(err)
}
return nd.Cid(), totalChildren
}
func mkNodeWithChildren(getChild func() *ProtoNode, width int) *ProtoNode {
cur := new(ProtoNode)
for i := 0; i < width; i++ {
c := getChild()
if err := cur.AddNodeLink(fmt.Sprint(i), c); err != nil {
panic(err)
}
}
return cur
}