This repository has been archived by the owner on Feb 21, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 230
/
encoding.go
149 lines (123 loc) · 2.81 KB
/
encoding.go
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
package storage
import (
"bufio"
"encoding/json"
"io"
"github.com/featurebasedb/featurebase/v3/dax"
"github.com/featurebasedb/featurebase/v3/dax/computer"
)
// TODO this needs to be genericized and moved
type TableKeyReader struct {
table dax.TableKey
partition dax.PartitionNum
scanner *bufio.Scanner
closer io.Closer
}
func NewTableKeyReader(qtid dax.QualifiedTableID, partition dax.PartitionNum, writelog io.ReadCloser) *TableKeyReader {
r := &TableKeyReader{
table: qtid.Key(),
partition: partition,
scanner: bufio.NewScanner(writelog),
closer: writelog,
}
return r
}
func (r *TableKeyReader) Read() (computer.PartitionKeyMap, error) {
if r.scanner == nil {
return computer.PartitionKeyMap{}, io.EOF
}
var b []byte
var out computer.PartitionKeyMap
if r.scanner.Scan() {
b = r.scanner.Bytes()
if err := json.Unmarshal(b, &out); err != nil {
return out, err
}
return out, nil
}
if err := r.scanner.Err(); err != nil {
return out, err
}
return out, io.EOF
}
func (r *TableKeyReader) Close() error {
if r.closer != nil {
return r.closer.Close()
}
return nil
}
type FieldKeyReader struct {
table dax.TableKey
field dax.FieldName
scanner *bufio.Scanner
closer io.Closer
}
func NewFieldKeyReader(qtid dax.QualifiedTableID, field dax.FieldName, writelog io.ReadCloser) *FieldKeyReader {
r := &FieldKeyReader{
table: qtid.Key(),
field: field,
scanner: bufio.NewScanner(writelog),
closer: writelog,
}
return r
}
func (r *FieldKeyReader) Read() (computer.FieldKeyMap, error) {
if r.scanner == nil {
return computer.FieldKeyMap{}, io.EOF
}
var b []byte
var out computer.FieldKeyMap
if r.scanner.Scan() {
b = r.scanner.Bytes()
if err := json.Unmarshal(b, &out); err != nil {
return out, err
}
return out, nil
}
if err := r.scanner.Err(); err != nil {
return out, err
}
return out, io.EOF
}
func (r *FieldKeyReader) Close() error {
if r.closer != nil {
return r.closer.Close()
}
return nil
}
type ShardReader struct {
table dax.TableKey
partition dax.PartitionNum
shard dax.ShardNum
version int
scanner *bufio.Scanner
closer io.Closer
}
func NewShardReader(qtid dax.QualifiedTableID, partition dax.PartitionNum, shard dax.ShardNum, writelog io.ReadCloser) *ShardReader {
r := &ShardReader{
table: qtid.Key(),
partition: partition,
shard: shard,
scanner: bufio.NewScanner(writelog),
closer: writelog,
}
return r
}
func (r *ShardReader) Read() (computer.LogMessage, error) {
if r.scanner == nil {
return nil, io.EOF
}
if r.scanner.Scan() {
return computer.UnmarshalLogMessage(r.scanner.Bytes())
}
if err := r.scanner.Err(); err != nil {
return nil, err
}
return nil, io.EOF
}
func (r *ShardReader) Close() error {
if r.closer != nil {
return r.closer.Close()
}
return nil
}