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
|
package bolt
import (
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
// Ensure that a temporary page can insert a key/value.
func TestLeafPut(t *testing.T) {
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("baz"), []byte("2"))
l.put([]byte("foo"), []byte("0"))
l.put([]byte("bar"), []byte("1"))
l.put([]byte("foo"), []byte("3"))
assert.Equal(t, len(l.items), 3)
assert.Equal(t, l.items[0], leafItem{[]byte("bar"), []byte("1")})
assert.Equal(t, l.items[1], leafItem{[]byte("baz"), []byte("2")})
assert.Equal(t, l.items[2], leafItem{[]byte("foo"), []byte("3")})
}
// Ensure that a temporary page can deserialize from a page.
func TestLeafRead(t *testing.T) {
// Create a page.
var buf [4096]byte
page := (*page)(unsafe.Pointer(&buf[0]))
page.count = 2
// Insert 2 leaf items at the beginning. sizeof(lnode) == 16
nodes := (*[3]lnode)(unsafe.Pointer(&page.ptr))
nodes[0] = lnode{flags: 0, pos: 32, ksize: 3, vsize: 4} // pos = sizeof(lnode) * 2
nodes[1] = lnode{flags: 0, pos: 23, ksize: 10, vsize: 3} // pos = sizeof(lnode) + 3 + 4
// Write data for the nodes at the end.
data := (*[4096]byte)(unsafe.Pointer(&nodes[2]))
copy(data[:], []byte("barfooz"))
copy(data[7:], []byte("helloworldbye"))
// Deserialize page into a temporary page.
l := &leaf{}
l.read(page)
// Check that there are two items with correct data.
assert.Equal(t, len(l.items), 2)
assert.Equal(t, l.items[0].key, []byte("bar"))
assert.Equal(t, l.items[0].value, []byte("fooz"))
assert.Equal(t, l.items[1].key, []byte("helloworld"))
assert.Equal(t, l.items[1].value, []byte("bye"))
}
// Ensure that a temporary page can serialize itself.
func TestLeafWrite(t *testing.T) {
// Create a temp page.
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("susy"), []byte("que"))
l.put([]byte("ricki"), []byte("lake"))
l.put([]byte("john"), []byte("johnson"))
// Write it to a page.
var buf [4096]byte
allocate := func(size int) (*page, error) {
return (*page)(unsafe.Pointer(&buf[0])), nil
}
pages, err := l.write(4096, allocate)
assert.NoError(t, err)
// Read the page back in.
l2 := &leaf{}
l2.read(pages[0])
// Check that the two pages are the same.
assert.Equal(t, len(l2.items), 3)
assert.Equal(t, l2.items[0].key, []byte("john"))
assert.Equal(t, l2.items[0].value, []byte("johnson"))
assert.Equal(t, l2.items[1].key, []byte("ricki"))
assert.Equal(t, l2.items[1].value, []byte("lake"))
assert.Equal(t, l2.items[2].key, []byte("susy"))
assert.Equal(t, l2.items[2].value, []byte("que"))
}
// Ensure that an error that an allocation error during writing is returned.
func TestLeafWriteError(t *testing.T) {
// Create a temp page.
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("susy"), []byte("que"))
// Write it to a page.
exp := &Error{}
allocate := func(size int) (*page, error) {
return nil, exp
}
pages, err := l.write(4096, allocate)
assert.Nil(t, pages)
assert.Equal(t, err, exp)
}
// Ensure that a temporary page can split into appropriate subgroups.
func TestLeafSplit(t *testing.T) {
// Create a temp page.
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("00000001"), []byte("0123456701234567"))
l.put([]byte("00000002"), []byte("0123456701234567"))
l.put([]byte("00000003"), []byte("0123456701234567"))
l.put([]byte("00000004"), []byte("0123456701234567"))
l.put([]byte("00000005"), []byte("0123456701234567"))
// Split between 3 & 4.
groups := l.split(100)
assert.Equal(t, len(groups), 2)
assert.Equal(t, len(groups[0]), 2)
assert.Equal(t, len(groups[1]), 3)
}
// Ensure that a temporary page with the minimum number of items just returns a single split group.
func TestLeafSplitWithMinKeys(t *testing.T) {
// Create a temp page.
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("00000001"), []byte("0123456701234567"))
l.put([]byte("00000002"), []byte("0123456701234567"))
// Split.
groups := l.split(20)
assert.Equal(t, len(groups), 1)
assert.Equal(t, len(groups[0]), 2)
}
// Ensure that a temporary page that has keys that all fit on a page just returns one split group.
func TestLeafSplitFitsInPage(t *testing.T) {
// Create a temp page.
l := &leaf{items: make(leafItems, 0)}
l.put([]byte("00000001"), []byte("0123456701234567"))
l.put([]byte("00000002"), []byte("0123456701234567"))
l.put([]byte("00000003"), []byte("0123456701234567"))
l.put([]byte("00000004"), []byte("0123456701234567"))
l.put([]byte("00000005"), []byte("0123456701234567"))
// Split.
groups := l.split(4096)
assert.Equal(t, len(groups), 1)
assert.Equal(t, len(groups[0]), 5)
}
|
