1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
package downloader
import (
"encoding/binary"
"math/big"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
)
var knownHash = common.Hash{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
func createHashes(start, amount int) (hashes []common.Hash) {
hashes = make([]common.Hash, amount+1)
hashes[len(hashes)-1] = knownHash
for i := range hashes[:len(hashes)-1] {
binary.BigEndian.PutUint64(hashes[i][:8], uint64(i+2))
}
return
}
func createBlock(i int, prevHash, hash common.Hash) *types.Block {
header := &types.Header{Number: big.NewInt(int64(i))}
block := types.NewBlockWithHeader(header)
block.HeaderHash = hash
block.ParentHeaderHash = knownHash
return block
}
func createBlocksFromHashes(hashes []common.Hash) map[common.Hash]*types.Block {
blocks := make(map[common.Hash]*types.Block)
for i, hash := range hashes {
blocks[hash] = createBlock(len(hashes)-i, knownHash, hash)
}
return blocks
}
type downloadTester struct {
downloader *Downloader
hashes []common.Hash
blocks map[common.Hash]*types.Block
t *testing.T
pcount int
done chan bool
activePeerId string
}
func newTester(t *testing.T, hashes []common.Hash, blocks map[common.Hash]*types.Block) *downloadTester {
tester := &downloadTester{t: t, hashes: hashes, blocks: blocks, done: make(chan bool)}
downloader := New(tester.hasBlock, tester.getBlock)
tester.downloader = downloader
return tester
}
func (dl *downloadTester) sync(peerId string, hash common.Hash) error {
dl.activePeerId = peerId
return dl.downloader.Synchronise(peerId, hash)
}
func (dl *downloadTester) hasBlock(hash common.Hash) bool {
if knownHash == hash {
return true
}
return false
}
func (dl *downloadTester) getBlock(hash common.Hash) *types.Block {
return dl.blocks[knownHash]
}
func (dl *downloadTester) getHashes(hash common.Hash) error {
dl.downloader.AddHashes(dl.activePeerId, dl.hashes)
return nil
}
func (dl *downloadTester) getBlocks(id string) func([]common.Hash) error {
return func(hashes []common.Hash) error {
blocks := make([]*types.Block, len(hashes))
for i, hash := range hashes {
blocks[i] = dl.blocks[hash]
}
go dl.downloader.DeliverChunk(id, blocks)
return nil
}
}
func (dl *downloadTester) newPeer(id string, td *big.Int, hash common.Hash) {
dl.pcount++
dl.downloader.RegisterPeer(id, hash, dl.getHashes, dl.getBlocks(id))
}
func (dl *downloadTester) badBlocksPeer(id string, td *big.Int, hash common.Hash) {
dl.pcount++
// This bad peer never returns any blocks
dl.downloader.RegisterPeer(id, hash, dl.getHashes, func([]common.Hash) error {
return nil
})
}
func TestDownload(t *testing.T) {
minDesiredPeerCount = 4
blockTtl = 1 * time.Second
targetBlocks := 1000
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
tester.activePeerId = "peer1"
err := tester.sync("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
inqueue := len(tester.downloader.queue.blockCache)
if inqueue != targetBlocks {
t.Error("expected", targetBlocks, "have", inqueue)
}
}
func TestMissing(t *testing.T) {
targetBlocks := 1000
hashes := createHashes(0, 1000)
extraHashes := createHashes(1001, 1003)
blocks := createBlocksFromHashes(append(extraHashes, hashes...))
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[len(hashes)-1])
hashes = append(extraHashes, hashes[:len(hashes)-1]...)
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
err := tester.sync("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
inqueue := len(tester.downloader.queue.blockCache)
if inqueue != targetBlocks {
t.Error("expected", targetBlocks, "have", inqueue)
}
}
func TestTaking(t *testing.T) {
minDesiredPeerCount = 4
blockTtl = 1 * time.Second
targetBlocks := 1000
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
err := tester.sync("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
bs1 := tester.downloader.TakeBlocks()
if len(bs1) != 1000 {
t.Error("expected to take 1000, got", len(bs1))
}
}
func TestInactiveDownloader(t *testing.T) {
targetBlocks := 1000
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashSet(createHashSet(hashes))
tester := newTester(t, hashes, nil)
err := tester.downloader.AddHashes("bad peer 001", hashes)
if err != errNoSyncActive {
t.Error("expected no sync error, got", err)
}
err = tester.downloader.DeliverChunk("bad peer 001", blocks)
if err != errNoSyncActive {
t.Error("expected no sync error, got", err)
}
}
func TestCancel(t *testing.T) {
minDesiredPeerCount = 4
blockTtl = 1 * time.Second
targetBlocks := 1000
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
err := tester.sync("peer1", hashes[0])
if err != nil {
t.Error("download error", err)
}
if !tester.downloader.Cancel() {
t.Error("cancel operation unsuccessfull")
}
hashSize, blockSize := tester.downloader.queue.Size()
if hashSize > 0 || blockSize > 0 {
t.Error("block (", blockSize, ") or hash (", hashSize, ") not 0")
}
}
func TestThrottling(t *testing.T) {
minDesiredPeerCount = 4
blockTtl = 1 * time.Second
targetBlocks := 4 * blockCacheLimit
hashes := createHashes(0, targetBlocks)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
// Concurrently download and take the blocks
errc := make(chan error, 1)
go func() {
errc <- tester.sync("peer1", hashes[0])
}()
done := make(chan struct{})
took := []*types.Block{}
go func() {
for {
select {
case <-done:
took = append(took, tester.downloader.TakeBlocks()...)
done <- struct{}{}
return
default:
took = append(took, tester.downloader.TakeBlocks()...)
}
}
}()
// Synchronise the two threads and verify
err := <-errc
done <- struct{}{}
<-done
if err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
if len(took) != targetBlocks {
t.Fatalf("downloaded block mismatch: have %v, want %v", len(took), targetBlocks)
}
}
|
