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
|
// Copyright (c) Meta Platforms, Inc. and affiliates.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/wide/wide_column_serialization.h"
#include <algorithm>
#include <cassert>
#include <limits>
#include "rocksdb/slice.h"
#include "util/autovector.h"
#include "util/coding.h"
namespace ROCKSDB_NAMESPACE {
Status WideColumnSerialization::SerializeImpl(const Slice* value_of_default,
const WideColumns& columns,
std::string& output) {
const size_t num_columns =
value_of_default ? columns.size() + 1 : columns.size();
if (num_columns > static_cast<size_t>(std::numeric_limits<uint32_t>::max())) {
return Status::InvalidArgument("Too many wide columns");
}
PutVarint32(&output, kCurrentVersion);
PutVarint32(&output, static_cast<uint32_t>(num_columns));
const Slice* prev_name = nullptr;
if (value_of_default) {
if (value_of_default->size() >
static_cast<size_t>(std::numeric_limits<uint32_t>::max())) {
return Status::InvalidArgument("Wide column value too long");
}
PutLengthPrefixedSlice(&output, kDefaultWideColumnName);
PutVarint32(&output, static_cast<uint32_t>(value_of_default->size()));
prev_name = &kDefaultWideColumnName;
}
for (size_t i = 0; i < columns.size(); ++i) {
const WideColumn& column = columns[i];
const Slice& name = column.name();
if (name.size() >
static_cast<size_t>(std::numeric_limits<uint32_t>::max())) {
return Status::InvalidArgument("Wide column name too long");
}
if (prev_name && prev_name->compare(name) >= 0) {
return Status::Corruption("Wide columns out of order");
}
const Slice& value = column.value();
if (value.size() >
static_cast<size_t>(std::numeric_limits<uint32_t>::max())) {
return Status::InvalidArgument("Wide column value too long");
}
PutLengthPrefixedSlice(&output, name);
PutVarint32(&output, static_cast<uint32_t>(value.size()));
prev_name = &name;
}
if (value_of_default) {
output.append(value_of_default->data(), value_of_default->size());
}
for (const auto& column : columns) {
const Slice& value = column.value();
output.append(value.data(), value.size());
}
return Status::OK();
}
Status WideColumnSerialization::Deserialize(Slice& input,
WideColumns& columns) {
assert(columns.empty());
uint32_t version = 0;
if (!GetVarint32(&input, &version)) {
return Status::Corruption("Error decoding wide column version");
}
if (version > kCurrentVersion) {
return Status::NotSupported("Unsupported wide column version");
}
uint32_t num_columns = 0;
if (!GetVarint32(&input, &num_columns)) {
return Status::Corruption("Error decoding number of wide columns");
}
if (!num_columns) {
return Status::OK();
}
columns.reserve(num_columns);
autovector<uint32_t, 16> column_value_sizes;
column_value_sizes.reserve(num_columns);
for (uint32_t i = 0; i < num_columns; ++i) {
Slice name;
if (!GetLengthPrefixedSlice(&input, &name)) {
return Status::Corruption("Error decoding wide column name");
}
if (!columns.empty() && columns.back().name().compare(name) >= 0) {
return Status::Corruption("Wide columns out of order");
}
columns.emplace_back(name, Slice());
uint32_t value_size = 0;
if (!GetVarint32(&input, &value_size)) {
return Status::Corruption("Error decoding wide column value size");
}
column_value_sizes.emplace_back(value_size);
}
const Slice data(input);
size_t pos = 0;
for (uint32_t i = 0; i < num_columns; ++i) {
const uint32_t value_size = column_value_sizes[i];
if (pos + value_size > data.size()) {
return Status::Corruption("Error decoding wide column value payload");
}
columns[i].value() = Slice(data.data() + pos, value_size);
pos += value_size;
}
return Status::OK();
}
WideColumns::const_iterator WideColumnSerialization::Find(
const WideColumns& columns, const Slice& column_name) {
const auto it =
std::lower_bound(columns.cbegin(), columns.cend(), column_name,
[](const WideColumn& lhs, const Slice& rhs) {
return lhs.name().compare(rhs) < 0;
});
if (it == columns.cend() || it->name() != column_name) {
return columns.cend();
}
return it;
}
Status WideColumnSerialization::GetValueOfDefaultColumn(Slice& input,
Slice& value) {
WideColumns columns;
const Status s = Deserialize(input, columns);
if (!s.ok()) {
return s;
}
if (columns.empty() || columns[0].name() != kDefaultWideColumnName) {
value.clear();
return Status::OK();
}
value = columns[0].value();
return Status::OK();
}
} // namespace ROCKSDB_NAMESPACE
|
