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hamt_test.go
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hamt_test.go
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package hamt
import (
"bytes"
"context"
crand "crypto/rand"
"crypto/sha256"
"encoding/binary"
"encoding/hex"
"fmt"
"math/rand"
"strconv"
"strings"
"sync"
"testing"
"time"
block "github.com/ipfs/go-block-format"
cid "github.com/ipfs/go-cid"
cbor "github.com/ipfs/go-ipld-cbor"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
cbg "github.com/whyrusleeping/cbor-gen"
)
type mockBlocks struct {
data map[cid.Cid]block.Block
dataMu sync.Mutex
stats blockstoreStats
}
func newMockBlocks() *mockBlocks {
return &mockBlocks{make(map[cid.Cid]block.Block), sync.Mutex{}, blockstoreStats{}}
}
func (mb *mockBlocks) Get(c cid.Cid) (block.Block, error) {
mb.dataMu.Lock()
defer mb.dataMu.Unlock()
mb.stats.evtcntGet++
d, ok := mb.data[c]
if ok {
return d, nil
}
return nil, fmt.Errorf("Not Found")
}
func (mb *mockBlocks) Put(b block.Block) error {
mb.dataMu.Lock()
defer mb.dataMu.Unlock()
mb.stats.evtcntPut++
if _, exists := mb.data[b.Cid()]; exists {
mb.stats.evtcntPutDup++
}
mb.data[b.Cid()] = b
return nil
}
type blockstoreStats struct {
evtcntGet int
evtcntPut int
evtcntPutDup int
}
func (mb *mockBlocks) totalBlockSizes() int {
mb.dataMu.Lock()
defer mb.dataMu.Unlock()
sum := 0
for _, v := range mb.data {
sum += len(v.RawData())
}
return sum
}
type blockSizesHistogram [12]int
func (mb *mockBlocks) getBlockSizesHistogram() (h blockSizesHistogram) {
mb.dataMu.Lock()
defer mb.dataMu.Unlock()
for _, v := range mb.data {
l := len(v.RawData())
switch {
case l <= 2<<2: // 8
h[0]++
case l <= 2<<3: // 16
h[1]++
case l <= 2<<4: // 32
h[2]++
case l <= 2<<5: // 64
h[3]++
case l <= 2<<6: // 128
h[4]++
case l <= 2<<7: // 256
h[5]++
case l <= 2<<8: // 512
h[6]++
case l <= 2<<9: // 1024
h[7]++
case l <= 2<<10: // 2048
h[8]++
case l <= 2<<11: // 4096
h[9]++
case l <= 2<<12: // 8192
h[10]++
default:
h[11]++
}
}
return
}
func (h blockSizesHistogram) String() string {
v := "["
v += "<=" + strconv.Itoa(2<<2) + ":" + strconv.Itoa(h[0]) + ", "
v += "<=" + strconv.Itoa(2<<3) + ":" + strconv.Itoa(h[1]) + ", "
v += "<=" + strconv.Itoa(2<<4) + ":" + strconv.Itoa(h[2]) + ", "
v += "<=" + strconv.Itoa(2<<5) + ":" + strconv.Itoa(h[3]) + ", "
v += "<=" + strconv.Itoa(2<<6) + ":" + strconv.Itoa(h[4]) + ", "
v += "<=" + strconv.Itoa(2<<7) + ":" + strconv.Itoa(h[5]) + ", "
v += "<=" + strconv.Itoa(2<<8) + ":" + strconv.Itoa(h[6]) + ", "
v += "<=" + strconv.Itoa(2<<9) + ":" + strconv.Itoa(h[7]) + ", "
v += "<=" + strconv.Itoa(2<<10) + ":" + strconv.Itoa(h[8]) + ", "
v += "<=" + strconv.Itoa(2<<11) + ":" + strconv.Itoa(h[9]) + ", "
v += "<=" + strconv.Itoa(2<<12) + ":" + strconv.Itoa(h[10]) + ", "
v += ">" + strconv.Itoa(2<<12) + ":" + strconv.Itoa(h[11])
return v + "]"
}
func randKey() string {
buf := make([]byte, 18)
crand.Read(buf)
return hex.EncodeToString(buf)
}
func randValue() *CborByteArray {
buf := CborByteArray(make([]byte, 30))
crand.Read(buf)
return &buf
}
//lint:ignore U1000 used for debugging
func dotGraph(n *Node) {
fmt.Println("digraph foo {")
name := 0
dotGraphRec(n, &name)
fmt.Println("}")
}
var identityHash = func(k []byte) []byte {
res := make([]byte, 32)
copy(res, k)
return res
}
var shortIdentityHash = func(k []byte) []byte {
res := make([]byte, 16)
copy(res, k)
return res
}
func TestCanonicalStructure(t *testing.T) {
addAndRemoveKeys(t, []string{"K"}, []string{"B"}, UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K0", "K1", "KAA1", "KAA2", "KAA3"}, []string{"KAA4"})
}
func TestCanonicalStructureAlternateBitWidth(t *testing.T) {
addAndRemoveKeys(t, []string{"K"}, []string{"B"}, UseTreeBitWidth(7), UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K0", "K1", "KAA1", "KAA2", "KAA3"}, []string{"KAA4"}, UseTreeBitWidth(7), UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K"}, []string{"B"}, UseTreeBitWidth(6), UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K0", "K1", "KAA1", "KAA2", "KAA3"}, []string{"KAA4"}, UseTreeBitWidth(6), UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K"}, []string{"B"}, UseTreeBitWidth(5), UseHashFunction(identityHash))
addAndRemoveKeys(t, []string{"K0", "K1", "KAA1", "KAA2", "KAA3"}, []string{"KAA4"}, UseTreeBitWidth(5), UseHashFunction(identityHash))
}
func TestOverflow(t *testing.T) {
keys := make([]string, 4)
for i := range keys {
keys[i] = strings.Repeat("A", 32) + fmt.Sprintf("%d", i)
}
cs := cbor.NewCborStore(newMockBlocks())
n, err := NewNode(cs, UseHashFunction(identityHash))
require.NoError(t, err)
for _, k := range keys[:3] {
err := n.Set(context.Background(), k, cborstr("foobar"))
assert.NoError(t, err)
}
// Try forcing the depth beyond 32
if err := n.Set(context.Background(), keys[3], cborstr("bad")); err != ErrMaxDepth {
t.Errorf("expected error %q, got %q", ErrMaxDepth, err)
}
// Force _to_ max depth.
err = n.Set(context.Background(), keys[3][1:], cborstr("bad"))
assert.NoError(t, err)
// Now, try fetching with a shorter hash function.
n.hash = shortIdentityHash
if _, err := n.Find(context.Background(), keys[0], nil); err != ErrMaxDepth {
t.Errorf("expected error %q, got %q", ErrMaxDepth, err)
}
}
func TestFillAndCollapse(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
root, err := NewNode(cs, UseTreeBitWidth(8), UseHashFunction(identityHash))
assert.NoError(t, err)
val := randValue()
// start with a single node and a single full bucket
err = root.Set(ctx, "AAAAAA11", val)
require.NoError(t, err)
err = root.Set(ctx, "AAAAAA12", val)
require.NoError(t, err)
err = root.Set(ctx, "AAAAAA21", val)
require.NoError(t, err)
st := stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 1 || st.totalKvs != 3 || st.counts[3] != 1 {
t.Fatal("Should be 1 node with 1 bucket")
}
baseCid, err := root.Write(ctx)
require.NoError(t, err)
// add a 4th colliding entry that forces a chain of new nodes to accommodate
// in a new node where there aren't collisions (7th byte)
err = root.Set(ctx, "AAAAAA22", val)
require.NoError(t, err)
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 7 || st.totalKvs != 4 || st.counts[2] != 2 {
t.Fatal("Should be 7 nodes with 4 buckets")
}
// remove and we should be back to the same structure as before
found, err := root.Delete(ctx, "AAAAAA22")
require.NoError(t, err)
require.True(t, found, "key not found")
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 1 || st.totalKvs != 3 || st.counts[3] != 1 {
t.Fatal("Should be 1 node with 1 bucket")
}
c, err := root.Write(ctx)
require.NoError(t, err)
if !c.Equals(baseCid) {
t.Fatal("CID mismatch on mutation")
}
// insert elements that collide at the 4th position so push the tree down by
// 3 nodes
err = root.Set(ctx, "AAA11AA", val)
require.NoError(t, err)
err = root.Set(ctx, "AAA12AA", val)
require.NoError(t, err)
err = root.Set(ctx, "AAA13AA", val)
require.NoError(t, err)
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 4 || st.totalKvs != 6 || st.counts[3] != 2 {
t.Fatal("Should be 4 nodes with 2 buckets of 3")
}
midCid, err := root.Write(ctx)
require.NoError(t, err)
// insert an overflow node that pushes the previous 4 into a separate node
err = root.Set(ctx, "AAA14AA", val)
require.NoError(t, err)
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 5 || st.totalKvs != 7 || st.counts[1] != 4 || st.counts[3] != 1 {
t.Fatal("Should be 4 node with 2 buckets")
}
// put the colliding 4th back in that will push down to full height
err = root.Set(ctx, "AAAAAA22", val)
require.NoError(t, err)
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 8 || st.totalKvs != 8 || st.counts[1] != 4 || st.counts[2] != 2 {
t.Fatal("Should be 7 nodes with 5 buckets")
}
// rewind back one step
found, err = root.Delete(ctx, "AAAAAA22")
require.NoError(t, err)
require.True(t, found, "key not found")
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 5 || st.totalKvs != 7 || st.counts[1] != 4 || st.counts[3] != 1 {
t.Fatal("Should be 4 node with 2 buckets")
}
// rewind another step
found, err = root.Delete(ctx, "AAA14AA")
require.NoError(t, err)
require.True(t, found, "key not found")
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 4 || st.totalKvs != 6 || st.counts[3] != 2 {
t.Fatal("Should be 4 nodes with 2 buckets of 3")
}
c, err = root.Write(ctx)
require.NoError(t, err)
if !c.Equals(midCid) {
t.Fatal("CID mismatch on mutation")
}
// remove the 3 colliding node so we should be back to the initial state
found, err = root.Delete(ctx, "AAA11AA")
require.NoError(t, err)
require.True(t, found, "key not found")
found, err = root.Delete(ctx, "AAA12AA")
require.NoError(t, err)
require.True(t, found, "key not found")
found, err = root.Delete(ctx, "AAA13AA")
require.NoError(t, err)
require.True(t, found, "key not found")
st = stats(root)
fmt.Println(st)
printHamt(root)
if st.totalNodes != 1 || st.totalKvs != 3 || st.counts[3] != 1 {
t.Fatal("Should be 1 node with 1 bucket")
}
// should have the same CID as original
c, err = root.Write(ctx)
require.NoError(t, err)
if !c.Equals(baseCid) {
t.Fatal("CID mismatch on mutation")
}
}
func addAndRemoveKeys(t *testing.T, keys []string, extraKeys []string, options ...Option) {
ctx := context.Background()
vals := make(map[string]*CborByteArray)
for i := 0; i < len(keys); i++ {
s := keys[i]
vals[s] = randValue()
}
cs := cbor.NewCborStore(newMockBlocks())
begn, err := NewNode(cs, options...)
require.NoError(t, err)
for _, k := range keys {
err := begn.Set(ctx, k, vals[k])
require.NoError(t, err)
}
fmt.Println("start flush")
bef := time.Now()
require.NoError(t, begn.Flush(ctx))
fmt.Println("flush took: ", time.Since(bef))
c, err := cs.Put(ctx, begn)
require.NoError(t, err)
var n Node
err = cs.Get(ctx, c, &n)
require.NoError(t, err)
n.store = cs
n.hash = begn.hash
n.bitWidth = begn.bitWidth
for k, v := range vals {
var out CborByteArray
found, err := n.Find(ctx, k, &out)
require.NoError(t, err)
require.True(t, found, "key not found")
if !bytes.Equal(out, *v) {
t.Fatalf("got wrong value after value change: %x != %x", out, v)
}
}
printHamt(begn)
// create second hamt by adding and deleting the extra keys
for i := 0; i < len(extraKeys); i++ {
err := begn.Set(ctx, extraKeys[i], randValue())
require.NoError(t, err)
}
for i := 0; i < len(extraKeys); i++ {
found, err := begn.Delete(ctx, extraKeys[i])
require.NoError(t, err)
require.True(t, found, "key not found")
}
err = begn.Flush(ctx)
require.NoError(t, err)
c2, err := cs.Put(ctx, begn)
require.NoError(t, err)
var n2 Node
err = cs.Get(ctx, c2, &n2)
require.NoError(t, err)
n2.store = cs
n2.hash = begn.hash
n2.bitWidth = begn.bitWidth
if !nodesEqual(t, cs, &n, &n2) {
t.Fatal("nodes should be equal")
}
}
func printHamt(hamt *Node) {
ctx := context.Background()
var printNode func(n *Node, depth int)
printNode = func(n *Node, depth int) {
c, err := n.store.Put(ctx, n)
if err != nil {
panic(err)
}
fmt.Printf("%s‣ %v:\n", strings.Repeat(" ", depth), c)
for _, p := range n.Pointers {
if p.isShard() {
child, err := p.loadChild(ctx, n.store, n.bitWidth, n.hash)
if err != nil {
panic(err)
}
printNode(child, depth+1)
} else {
var keys []string
for _, pt := range p.KVs {
keys = append(keys, string(pt.Key))
}
fmt.Printf("%s⇶ [ %s ]\n", strings.Repeat(" ", depth+1), strings.Join(keys, ", "))
}
}
}
printNode(hamt, 0)
}
func dotGraphRec(n *Node, name *int) {
cur := *name
for _, p := range n.Pointers {
if p.isShard() {
*name++
fmt.Printf("\tn%d -> n%d;\n", cur, *name)
nd, err := p.loadChild(context.Background(), n.store, n.bitWidth, n.hash)
if err != nil {
panic(err)
}
dotGraphRec(nd, name)
} else {
var names []string
for _, pt := range p.KVs {
names = append(names, string(pt.Key))
}
fmt.Printf("\tn%d -> n%s;\n", cur, strings.Join(names, "_"))
}
}
}
type hamtStats struct {
totalNodes int
totalKvs int
counts map[int]int
}
func (hs hamtStats) String() string {
return fmt.Sprintf("nodes=%d, kvs=%d, counts=%v", hs.totalNodes, hs.totalKvs, hs.counts)
}
func stats(n *Node) *hamtStats {
st := &hamtStats{counts: make(map[int]int)}
statsrec(n, st)
return st
}
func statsrec(n *Node, st *hamtStats) {
st.totalNodes++
for _, p := range n.Pointers {
if p.isShard() {
nd, err := p.loadChild(context.Background(), n.store, n.bitWidth, n.hash)
if err != nil {
panic(err)
}
statsrec(nd, st)
} else {
st.totalKvs += len(p.KVs)
st.counts[len(p.KVs)]++
}
}
}
func TestHash(t *testing.T) {
h1 := defaultHashFunction([]byte("abcd"))
h2 := defaultHashFunction([]byte("abce"))
if h1[0] == h2[0] && h1[1] == h2[1] && h1[3] == h2[3] {
t.Fatal("Hash should give different strings different hash prefixes")
}
}
func TestBasic(t *testing.T) {
testBasic(t)
}
func TestSha256(t *testing.T) {
testBasic(t, UseHashFunction(func(in []byte) []byte {
out := sha256.Sum256(in)
return out[:]
}))
}
func testBasic(t *testing.T, options ...Option) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
begn, err := NewNode(cs, options...)
require.NoError(t, err)
val := cborstr("cat dog bear")
err = begn.Set(ctx, "foo", val)
require.NoError(t, err)
for i := 0; i < 1000; i++ {
err := begn.Set(ctx, randKey(), randValue())
require.NoError(t, err)
}
require.NoError(t, begn.Flush(ctx))
c, err := cs.Put(ctx, begn)
require.NoError(t, err)
n, err := LoadNode(ctx, cs, c, options...)
require.NoError(t, err)
var out CborByteArray
found, err := n.Find(ctx, "foo", &out)
require.NoError(t, err)
require.True(t, found, "key not found")
if !bytes.Equal(out, *val) {
t.Fatal("out bytes were wrong: ", out)
}
}
func TestSetIfAbsent(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
begn, err := NewNode(cs)
require.NoError(t, err)
val1 := cborstr("owl bear")
key := "favorite-animal"
success, err := begn.SetIfAbsent(ctx, key, val1)
require.NoError(t, err)
if !success {
t.Fatal("expected fresh set to work")
}
val2 := cborstr("bright green bear")
success, err = begn.SetIfAbsent(ctx, key, val2)
require.NoError(t, err)
if success {
t.Fatal("expected duplicate set to fail")
}
success, err = begn.SetIfAbsent(ctx, key, val1)
require.NoError(t, err)
if success {
t.Fatal("expected duplicate set with same value to also fail")
}
// Behavior persists across flushes
require.NoError(t, begn.Flush(ctx))
c, err := cs.Put(ctx, begn)
require.NoError(t, err)
n, err := LoadNode(ctx, cs, c)
require.NoError(t, err)
success, err = n.SetIfAbsent(ctx, key, val2)
require.NoError(t, err)
if success {
t.Fatal("expected duplicate set after flush to fail")
}
}
func TestSetWithNoEffectDoesNotPut(t *testing.T) {
ctx := context.Background()
mb := newMockBlocks()
cs := cbor.NewCborStore(mb)
begn, err := NewNode(cs, UseTreeBitWidth(1)) // branching factor of 2 to fill up root node quickly
require.NoError(t, err)
// Fill up the root node so flushes actually Put to store
fillUpEntries := 2 * bucketSize * 5 // do 5 x the amount needed to fill up root node to fill with high probability
for i := 0; i < fillUpEntries; i++ {
require.NoError(t, begn.Set(ctx, strconv.Itoa(i), cborstr("filler")))
}
require.NoError(t, begn.Flush(ctx))
key := "favorite-animal"
val1 := cborstr("bright green bear")
require.NoError(t, begn.Set(ctx, key, val1))
require.NoError(t, begn.Flush(ctx))
firstPutCount := mb.stats.evtcntPut
if firstPutCount <= 0 {
t.Fatal("expect first flush to Put to store")
}
// Set does not change key value mapping
require.NoError(t, begn.Set(ctx, key, val1))
require.NoError(t, begn.Flush(ctx))
secondPutCount := mb.stats.evtcntPut
if secondPutCount != firstPutCount {
t.Fatalf("expected first Put count %d to equal second Put count %d", firstPutCount, secondPutCount)
}
}
func TestDelete(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
begn, err := NewNode(cs)
require.NoError(t, err)
val := cborstr("cat dog bear")
err = begn.Set(ctx, "foo", val)
require.NoError(t, err)
for i := 0; i < 10; i++ {
err := begn.Set(ctx, randKey(), randValue())
require.NoError(t, err)
}
require.NoError(t, begn.Flush(ctx))
c, err := cs.Put(ctx, begn)
require.NoError(t, err)
n, err := LoadNode(ctx, cs, c)
require.NoError(t, err)
found, err := n.Delete(ctx, "foo")
require.NoError(t, err)
require.True(t, found, "key not found")
var out CborByteArray
found, err = n.Find(ctx, "foo", &out)
require.NoError(t, err)
require.False(t, found, "key unexpectedly found")
}
func TestSetGet(t *testing.T) {
ctx := context.Background()
vals := make(map[string]*CborByteArray)
var keys []string
for i := 0; i < 100000; i++ {
s := randKey()
vals[s] = randValue()
keys = append(keys, s)
}
cs := cbor.NewCborStore(newMockBlocks())
begn, err := NewNode(cs)
require.NoError(t, err)
for _, k := range keys {
err := begn.Set(ctx, k, vals[k])
require.NoError(t, err)
}
size, err := begn.checkSize(ctx)
require.NoError(t, err)
mapsize := 0
for k, v := range vals {
mapsize += (len(k) + len(*v))
}
fmt.Printf("Total size is: %d, size of keys+vals: %d, overhead: %.2f\n", size, mapsize, float64(size)/float64(mapsize))
fmt.Println(stats(begn))
fmt.Println("start flush")
bef := time.Now()
require.NoError(t, begn.Flush(ctx))
fmt.Println("flush took: ", time.Since(bef))
c, err := cs.Put(ctx, begn)
require.NoError(t, err)
var n Node
err = cs.Get(ctx, c, &n)
require.NoError(t, err)
n.store = cs
n.hash = defaultHashFunction
n.bitWidth = defaultBitWidth
bef = time.Now()
//for k, v := range vals {
for _, k := range keys {
v := vals[k]
var out CborByteArray
found, err := n.Find(ctx, k, &out)
require.NoError(t, err)
require.True(t, found, "key not found")
if !bytes.Equal(out, *v) {
t.Fatal("got wrong value")
}
}
fmt.Println("finds took: ", time.Since(bef))
for i := 0; i < 100; i++ {
found, err := n.Find(ctx, randKey(), nil)
require.NoError(t, err)
require.False(t, found, "expected not found")
}
for k := range vals {
next := randValue()
err := n.Set(ctx, k, next)
require.NoError(t, err)
vals[k] = next
}
for k, v := range vals {
var out CborByteArray
found, err := n.Find(ctx, k, &out)
require.NoError(t, err)
require.True(t, found, "key not found")
if !bytes.Equal(out, *v) {
t.Fatal("got wrong value after value change")
}
}
for i := 0; i < 100; i++ {
found, err := n.Delete(ctx, randKey())
require.NoError(t, err)
require.False(t, found, "expected not found")
}
for _, k := range keys {
found, err := n.Delete(ctx, k)
require.NoError(t, err)
require.True(t, found, "key not found")
found, err = n.Find(ctx, k, nil)
require.NoError(t, err)
require.False(t, found, "expected not found")
}
}
func nodesEqual(t *testing.T, store cbor.IpldStore, n1, n2 *Node) bool {
ctx := context.Background()
err := n1.Flush(ctx)
require.NoError(t, err)
n1Cid, err := store.Put(ctx, n1)
require.NoError(t, err)
err = n2.Flush(ctx)
require.NoError(t, err)
n2Cid, err := store.Put(ctx, n2)
require.NoError(t, err)
return n1Cid.Equals(n2Cid)
}
func TestReloadEmpty(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
n, err := NewNode(cs)
require.NoError(t, err)
c, err := cs.Put(ctx, n)
require.NoError(t, err)
on, err := LoadNode(ctx, cs, c)
require.NoError(t, err)
err = on.Set(ctx, "foo", cborstr("bar"))
require.NoError(t, err)
}
func TestCopy(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
n, err := NewNode(cs)
require.NoError(t, err)
nc := n.Copy()
if !nodesEqual(t, cs, n, nc) {
t.Fatal("nodes should be equal")
}
err = n.Set(ctx, "key", cborstr("a"))
require.NoError(t, err)
if nodesEqual(t, cs, n, nc) {
t.Fatal("nodes should not be equal -- we set a key on n")
}
nc = n.Copy()
err = nc.Set(ctx, "key2", cborstr("b"))
require.NoError(t, err)
if nodesEqual(t, cs, n, nc) {
t.Fatal("nodes should not be equal -- we set a key on nc")
}
n = nc.Copy()
if !nodesEqual(t, cs, n, nc) {
t.Fatal("nodes should be equal")
}
}
func TestCopyCopiesNilSlices(t *testing.T) {
cs := cbor.NewCborStore(newMockBlocks())
n, err := NewNode(cs)
require.NoError(t, err)
pointer := &Pointer{}
n.Pointers = append(n.Pointers, pointer)
if n.Pointers[0].KVs != nil {
t.Fatal("Expected uninitialize slice to be nil")
}
nc := n.Copy()
if nc.Pointers[0].KVs != nil {
t.Fatal("Expected copied nil slices to be nil")
}
}
func TestCopyWithoutFlush(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
count := 200
n, err := NewNode(cs)
require.NoError(t, err)
for i := 0; i < count; i++ {
v := cbg.CborInt(i)
err := n.Set(ctx, fmt.Sprintf("key%d", i), &v)
require.NoError(t, err)
}
require.NoError(t, n.Flush(ctx))
for i := 0; i < count; i++ {
v := cbg.CborInt(count + i)
err := n.Set(ctx, fmt.Sprintf("key%d", i), &v)
require.NoError(t, err)
}
nc := n.Copy()
for i := 0; i < count; i++ {
key := fmt.Sprintf("key%d", i)
var val cbg.CborInt
found, err := n.Find(ctx, key, &val)
require.NoError(t, err)
require.True(t, found, "key not found")
var valCopy cbg.CborInt
found, err = nc.Find(ctx, key, &valCopy)
require.NoError(t, err)
require.True(t, found, "key not found")
if val != valCopy {
t.Fatalf("copy does not equal original (%d != %d)", valCopy, val)
}
}
}
func TestSetNilValues(t *testing.T) {
ctx := context.Background()
cs := cbor.NewCborStore(newMockBlocks())
n, err := NewNode(cs)
require.NoError(t, err)
k := make([]byte, 1)
for i := 0; i < 500; i++ {
k[0] = byte(i)
var um cbg.CBORMarshaler
err := n.Set(ctx, string(k), um)
require.NoError(t, err)
}
nn, err := NewNode(cs)
require.NoError(t, err)
rc, err := cs.Put(ctx, nn)
require.NoError(t, err)
for i := 0; i < 500; i++ {
tn, err := LoadNode(ctx, cs, rc)
require.NoError(t, err)
k[0] = byte(i)
var n cbg.CBORMarshaler
err = tn.Set(ctx, string(k), n)
require.NoError(t, err)
require.NoError(t, tn.Flush(ctx))
rc, err = cs.Put(ctx, tn)
require.NoError(t, err)
}
}
// Some tests that use manually constructed (and very basic) CBOR forms of
// nodes to test whether the implementation will reject malformed encoded nodes
// on load.
func TestMalformedHamt(t *testing.T) {
ctx := context.Background()
blocks := newMockBlocks()
cs := cbor.NewCborStore(blocks)
bcid, err := cid.Decode("bafy2bzaceab7vkg5c3zti7ebqensb3onksjkc4wwktkiledkezgvnbvzs4cti")
require.NoError(t, err)
bccid, err := cid.Decode("bafy2bzaceab7vkg5c3zti7ebqensb3onksjkc4wwktkiledkezgvnbvzs4cqa")
require.NoError(t, err)
// just the bcid bytes, without the tag
cidBytes, err := hex.DecodeString("000171A0E4022003FAA8DD16F3347C81811B20EDCD5492A172D654D485906A264D5686B9970534")
require.NoError(t, err)
// just the bccid bytes, without the tag, prefixed with 0x00 for dag-cbor
ccidBytes, err := hex.DecodeString("000171a0e4022003faa8dd16f3347c81811b20edcd5492a172d654d485906a264d5686b9970500")
require.NoError(t, err)
// badCidBytes is cidBytes but with dag-pb, prefixed with 0x00 for dag-cbor
badCidBytes, err := hex.DecodeString("000170a0e4022003faa8dd16f3347c81811b20edcd5492a172d654d485906a264d5686b9970534")
require.NoError(t, err)
// util closures
store := func(blob []byte) {
blocks.data[bcid] = block.NewBlock(blob)
}
load := func() *Node {
n, err := LoadNode(ctx, cs, bcid, UseTreeBitWidth(8), UseHashFunction(identityHash))
require.NoError(t, err)
return n
}
find := func(key []byte, expected []byte) *[]byte {
found, vg, err := load().FindRaw(ctx, string(key))
require.NoError(t, err)
require.True(t, found, "key not found")
// should find a bytes(1) "\xff"
if !bytes.Equal(vg, expected) {
return &vg
}
return nil
}
type kv struct {
key byte
value byte
}
bucketCbor := func(kvs ...kv) []byte {
en := []byte{}
for _, kv := range kvs {
en = bcat(en, bcat(b(0x80+2), // array(2)
bcat(b(0x40+1), b(kv.key)), // bytes(1) "\x??"
bcat(b(0x40+1), b(kv.value)))) // bytes(1) "\x??"
}
return bcat(
b(0x80+byte(len(kvs))), // array(?)
en) // bucket contents
}
// most minimal HAMT node with one k/v entry, sanity check we can load this
store(
bcat(b(0x80+2), // array(2)
bcat(b(0x40+1), b(0x01)), // bytes(1) "\x01" (bitmap)
bcat(b(0x80+1), // array(1)
bucketCbor(kv{0x00, 0xff})))) // 0x00=0xff
// should find a bytes(1) "\xff"
find(b(0x00), bcat(b(0x40+1), b(0xff)))
// print the raw cbor: fmt.Printf("%v\n", hex.EncodeToString(blocks.data[bcid].RawData()))
// 10 entry node, assumed bitwidth of >3
store(
bcat(b(0x80+2), // array(2)
bcat(b(0x40+2), []byte{0x03, 0xff}), // bytes(1) "\x3ff" (bitmap with lower 10 bits set)
bcat(b(0x80+10), // array(10)
bucketCbor(kv{0x00, 0xf0}), // 0x00=0xf0