forked from bitcoin/bitcoin
-
Notifications
You must be signed in to change notification settings - Fork 0
/
skiplist_tests.cpp
191 lines (163 loc) · 8.09 KB
/
skiplist_tests.cpp
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
// Copyright (c) 2014-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <chain.h>
#include <test/util/random.h>
#include <test/util/setup_common.h>
#include <vector>
#include <boost/test/unit_test.hpp>
#define SKIPLIST_LENGTH 300000
BOOST_FIXTURE_TEST_SUITE(skiplist_tests, BasicTestingSetup)
BOOST_AUTO_TEST_CASE(skiplist_test)
{
std::vector<CBlockIndex> vIndex(SKIPLIST_LENGTH);
for (int i=0; i<SKIPLIST_LENGTH; i++) {
vIndex[i].nHeight = i;
vIndex[i].pprev = (i == 0) ? nullptr : &vIndex[i - 1];
vIndex[i].BuildSkip();
}
for (int i=0; i<SKIPLIST_LENGTH; i++) {
if (i > 0) {
BOOST_CHECK(vIndex[i].pskip == &vIndex[vIndex[i].pskip->nHeight]);
BOOST_CHECK(vIndex[i].pskip->nHeight < i);
} else {
BOOST_CHECK(vIndex[i].pskip == nullptr);
}
}
for (int i=0; i < 1000; i++) {
int from = m_rng.randrange(SKIPLIST_LENGTH - 1);
int to = m_rng.randrange(from + 1);
BOOST_CHECK(vIndex[SKIPLIST_LENGTH - 1].GetAncestor(from) == &vIndex[from]);
BOOST_CHECK(vIndex[from].GetAncestor(to) == &vIndex[to]);
BOOST_CHECK(vIndex[from].GetAncestor(0) == vIndex.data());
}
}
BOOST_AUTO_TEST_CASE(getlocator_test)
{
// Build a main chain 100000 blocks long.
std::vector<uint256> vHashMain(100000);
std::vector<CBlockIndex> vBlocksMain(100000);
for (unsigned int i=0; i<vBlocksMain.size(); i++) {
vHashMain[i] = ArithToUint256(i); // Set the hash equal to the height, so we can quickly check the distances.
vBlocksMain[i].nHeight = i;
vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : nullptr;
vBlocksMain[i].phashBlock = &vHashMain[i];
vBlocksMain[i].BuildSkip();
BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksMain[i].GetBlockHash()).GetLow64(), vBlocksMain[i].nHeight);
BOOST_CHECK(vBlocksMain[i].pprev == nullptr || vBlocksMain[i].nHeight == vBlocksMain[i].pprev->nHeight + 1);
}
// Build a branch that splits off at block 49999, 50000 blocks long.
std::vector<uint256> vHashSide(50000);
std::vector<CBlockIndex> vBlocksSide(50000);
for (unsigned int i=0; i<vBlocksSide.size(); i++) {
vHashSide[i] = ArithToUint256(i + 50000 + (arith_uint256(1) << 128)); // Add 1<<128 to the hashes, so GetLow64() still returns the height.
vBlocksSide[i].nHeight = i + 50000;
vBlocksSide[i].pprev = i ? &vBlocksSide[i - 1] : (vBlocksMain.data()+49999);
vBlocksSide[i].phashBlock = &vHashSide[i];
vBlocksSide[i].BuildSkip();
BOOST_CHECK_EQUAL((int)UintToArith256(vBlocksSide[i].GetBlockHash()).GetLow64(), vBlocksSide[i].nHeight);
BOOST_CHECK(vBlocksSide[i].pprev == nullptr || vBlocksSide[i].nHeight == vBlocksSide[i].pprev->nHeight + 1);
}
// Build a CChain for the main branch.
CChain chain;
chain.SetTip(vBlocksMain.back());
// Test 100 random starting points for locators.
for (int n=0; n<100; n++) {
int r = m_rng.randrange(150000);
CBlockIndex* tip = (r < 100000) ? &vBlocksMain[r] : &vBlocksSide[r - 100000];
CBlockLocator locator = GetLocator(tip);
// The first result must be the block itself, the last one must be genesis.
BOOST_CHECK(locator.vHave.front() == tip->GetBlockHash());
BOOST_CHECK(locator.vHave.back() == vBlocksMain[0].GetBlockHash());
// Entries 1 through 11 (inclusive) go back one step each.
for (unsigned int i = 1; i < 12 && i < locator.vHave.size() - 1; i++) {
BOOST_CHECK_EQUAL(UintToArith256(locator.vHave[i]).GetLow64(), tip->nHeight - i);
}
// The further ones (excluding the last one) go back with exponential steps.
unsigned int dist = 2;
for (unsigned int i = 12; i < locator.vHave.size() - 1; i++) {
BOOST_CHECK_EQUAL(UintToArith256(locator.vHave[i - 1]).GetLow64() - UintToArith256(locator.vHave[i]).GetLow64(), dist);
dist *= 2;
}
}
}
BOOST_AUTO_TEST_CASE(findearliestatleast_test)
{
std::vector<uint256> vHashMain(100000);
std::vector<CBlockIndex> vBlocksMain(100000);
for (unsigned int i=0; i<vBlocksMain.size(); i++) {
vHashMain[i] = ArithToUint256(i); // Set the hash equal to the height
vBlocksMain[i].nHeight = i;
vBlocksMain[i].pprev = i ? &vBlocksMain[i - 1] : nullptr;
vBlocksMain[i].phashBlock = &vHashMain[i];
vBlocksMain[i].BuildSkip();
if (i < 10) {
vBlocksMain[i].nTime = i;
vBlocksMain[i].nTimeMax = i;
} else {
// randomly choose something in the range [MTP, MTP*2]
int64_t medianTimePast = vBlocksMain[i].GetMedianTimePast();
int r{int(m_rng.randrange(medianTimePast))};
vBlocksMain[i].nTime = uint32_t(r + medianTimePast);
vBlocksMain[i].nTimeMax = std::max(vBlocksMain[i].nTime, vBlocksMain[i-1].nTimeMax);
}
}
// Check that we set nTimeMax up correctly.
unsigned int curTimeMax = 0;
for (unsigned int i=0; i<vBlocksMain.size(); ++i) {
curTimeMax = std::max(curTimeMax, vBlocksMain[i].nTime);
BOOST_CHECK(curTimeMax == vBlocksMain[i].nTimeMax);
}
// Build a CChain for the main branch.
CChain chain;
chain.SetTip(vBlocksMain.back());
// Verify that FindEarliestAtLeast is correct.
for (unsigned int i=0; i<10000; ++i) {
// Pick a random element in vBlocksMain.
int r = m_rng.randrange(vBlocksMain.size());
int64_t test_time = vBlocksMain[r].nTime;
CBlockIndex* ret = chain.FindEarliestAtLeast(test_time, 0);
BOOST_CHECK(ret->nTimeMax >= test_time);
BOOST_CHECK((ret->pprev==nullptr) || ret->pprev->nTimeMax < test_time);
BOOST_CHECK(vBlocksMain[r].GetAncestor(ret->nHeight) == ret);
}
}
BOOST_AUTO_TEST_CASE(findearliestatleast_edge_test)
{
std::list<CBlockIndex> blocks;
for (const unsigned int timeMax : {100, 100, 100, 200, 200, 200, 300, 300, 300}) {
CBlockIndex* prev = blocks.empty() ? nullptr : &blocks.back();
blocks.emplace_back();
blocks.back().nHeight = prev ? prev->nHeight + 1 : 0;
blocks.back().pprev = prev;
blocks.back().BuildSkip();
blocks.back().nTimeMax = timeMax;
}
CChain chain;
chain.SetTip(blocks.back());
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(50, 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(100, 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(150, 0)->nHeight, 3);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(200, 0)->nHeight, 3);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(250, 0)->nHeight, 6);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(300, 0)->nHeight, 6);
BOOST_CHECK(!chain.FindEarliestAtLeast(350, 0));
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(0, 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(-1, 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(std::numeric_limits<int64_t>::min(), 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(-int64_t(std::numeric_limits<unsigned int>::max()) - 1, 0)->nHeight, 0);
BOOST_CHECK(!chain.FindEarliestAtLeast(std::numeric_limits<int64_t>::max(), 0));
BOOST_CHECK(!chain.FindEarliestAtLeast(std::numeric_limits<unsigned int>::max(), 0));
BOOST_CHECK(!chain.FindEarliestAtLeast(int64_t(std::numeric_limits<unsigned int>::max()) + 1, 0));
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(0, -1)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(0, 0)->nHeight, 0);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(0, 3)->nHeight, 3);
BOOST_CHECK_EQUAL(chain.FindEarliestAtLeast(0, 8)->nHeight, 8);
BOOST_CHECK(!chain.FindEarliestAtLeast(0, 9));
CBlockIndex* ret1 = chain.FindEarliestAtLeast(100, 2);
BOOST_CHECK(ret1->nTimeMax >= 100 && ret1->nHeight == 2);
BOOST_CHECK(!chain.FindEarliestAtLeast(300, 9));
CBlockIndex* ret2 = chain.FindEarliestAtLeast(200, 4);
BOOST_CHECK(ret2->nTimeMax >= 200 && ret2->nHeight == 4);
}
BOOST_AUTO_TEST_SUITE_END()