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
|
package packfile
import (
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/storage/memory"
. "gopkg.in/check.v1"
)
type DeltaSelectorSuite struct {
ds *deltaSelector
store *memory.Storage
hashes map[string]plumbing.Hash
}
var _ = Suite(&DeltaSelectorSuite{})
func (s *DeltaSelectorSuite) SetUpTest(c *C) {
s.store = memory.NewStorage()
s.createTestObjects()
s.ds = newDeltaSelector(s.store)
}
func (s *DeltaSelectorSuite) TestSort(c *C) {
var o1 = newObjectToPack(newObject(plumbing.BlobObject, []byte("00000")))
var o4 = newObjectToPack(newObject(plumbing.BlobObject, []byte("0000")))
var o6 = newObjectToPack(newObject(plumbing.BlobObject, []byte("00")))
var o9 = newObjectToPack(newObject(plumbing.BlobObject, []byte("0")))
var o8 = newObjectToPack(newObject(plumbing.TreeObject, []byte("000")))
var o2 = newObjectToPack(newObject(plumbing.TreeObject, []byte("00")))
var o3 = newObjectToPack(newObject(plumbing.TreeObject, []byte("0")))
var o5 = newObjectToPack(newObject(plumbing.CommitObject, []byte("0000")))
var o7 = newObjectToPack(newObject(plumbing.CommitObject, []byte("00")))
toSort := []*ObjectToPack{o1, o2, o3, o4, o5, o6, o7, o8, o9}
s.ds.sort(toSort)
expected := []*ObjectToPack{o1, o4, o6, o9, o8, o2, o3, o5, o7}
c.Assert(toSort, DeepEquals, expected)
}
type testObject struct {
id string
object plumbing.EncodedObject
}
var testObjects []*testObject = []*testObject{{
id: "base",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000,
val: "a",
}, {
times: 1000,
val: "b",
}})),
}, {
id: "smallBase",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1,
val: "a",
}, {
times: 1,
val: "b",
}, {
times: 6,
val: "c",
}})),
}, {
id: "smallTarget",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1,
val: "a",
}, {
times: 1,
val: "c",
}})),
}, {
id: "target",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000,
val: "a",
}, {
times: 1000,
val: "b",
}, {
times: 1000,
val: "c",
}})),
}, {
id: "o1",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000,
val: "a",
}, {
times: 1000,
val: "b",
}})),
}, {
id: "o2",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000,
val: "a",
}, {
times: 500,
val: "b",
}})),
}, {
id: "o3",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000,
val: "a",
}, {
times: 499,
val: "b",
}})),
}, {
id: "bigBase",
object: newObject(plumbing.BlobObject,
genBytes([]piece{{
times: 1000000,
val: "a",
}})),
}, {
id: "treeType",
object: newObject(plumbing.TreeObject,
[]byte("I am a tree!")),
}}
func (s *DeltaSelectorSuite) createTestObjects() {
s.hashes = make(map[string]plumbing.Hash)
for _, o := range testObjects {
h, err := s.store.SetEncodedObject(o.object)
if err != nil {
panic(err)
}
s.hashes[o.id] = h
}
}
func (s *DeltaSelectorSuite) TestObjectsToPack(c *C) {
// Different type
hashes := []plumbing.Hash{s.hashes["base"], s.hashes["treeType"]}
deltaWindowSize := uint(10)
otp, err := s.ds.ObjectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 2)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["base"]])
c.Assert(otp[1].Object, Equals, s.store.Objects[s.hashes["treeType"]])
// Size radically different
hashes = []plumbing.Hash{s.hashes["bigBase"], s.hashes["target"]}
otp, err = s.ds.ObjectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 2)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["bigBase"]])
c.Assert(otp[1].Object, Equals, s.store.Objects[s.hashes["target"]])
// Delta Size Limit with no best delta yet
hashes = []plumbing.Hash{s.hashes["smallBase"], s.hashes["smallTarget"]}
otp, err = s.ds.ObjectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 2)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["smallBase"]])
c.Assert(otp[1].Object, Equals, s.store.Objects[s.hashes["smallTarget"]])
// It will create the delta
hashes = []plumbing.Hash{s.hashes["base"], s.hashes["target"]}
otp, err = s.ds.ObjectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 2)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["target"]])
c.Assert(otp[0].IsDelta(), Equals, false)
c.Assert(otp[1].Original, Equals, s.store.Objects[s.hashes["base"]])
c.Assert(otp[1].IsDelta(), Equals, true)
c.Assert(otp[1].Depth, Equals, 1)
// If our base is another delta, the depth will increase by one
hashes = []plumbing.Hash{
s.hashes["o1"],
s.hashes["o2"],
s.hashes["o3"],
}
otp, err = s.ds.ObjectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 3)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["o1"]])
c.Assert(otp[0].IsDelta(), Equals, false)
c.Assert(otp[1].Original, Equals, s.store.Objects[s.hashes["o2"]])
c.Assert(otp[1].IsDelta(), Equals, true)
c.Assert(otp[1].Depth, Equals, 1)
c.Assert(otp[2].Original, Equals, s.store.Objects[s.hashes["o3"]])
c.Assert(otp[2].IsDelta(), Equals, true)
c.Assert(otp[2].Depth, Equals, 2)
// Check that objects outside of the sliding window don't produce
// a delta.
hashes = make([]plumbing.Hash, 0, deltaWindowSize+2)
hashes = append(hashes, s.hashes["base"])
for i := uint(0); i < deltaWindowSize; i++ {
hashes = append(hashes, s.hashes["smallTarget"])
}
hashes = append(hashes, s.hashes["target"])
// Don't sort so we can easily check the sliding window without
// creating a bunch of new objects.
otp, err = s.ds.objectsToPack(hashes, deltaWindowSize)
c.Assert(err, IsNil)
err = s.ds.walk(otp, deltaWindowSize)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, int(deltaWindowSize)+2)
targetIdx := len(otp) - 1
c.Assert(otp[targetIdx].IsDelta(), Equals, false)
// Check that no deltas are created, and the objects are unsorted,
// if compression is off.
hashes = []plumbing.Hash{s.hashes["base"], s.hashes["target"]}
otp, err = s.ds.ObjectsToPack(hashes, 0)
c.Assert(err, IsNil)
c.Assert(len(otp), Equals, 2)
c.Assert(otp[0].Object, Equals, s.store.Objects[s.hashes["base"]])
c.Assert(otp[0].IsDelta(), Equals, false)
c.Assert(otp[1].Original, Equals, s.store.Objects[s.hashes["target"]])
c.Assert(otp[1].IsDelta(), Equals, false)
c.Assert(otp[1].Depth, Equals, 0)
}
func (s *DeltaSelectorSuite) TestMaxDepth(c *C) {
dsl := s.ds.deltaSizeLimit(0, 0, int(maxDepth), true)
c.Assert(dsl, Equals, int64(0))
}
|
