forked from segmentio/kafka-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
reflect.go
142 lines (124 loc) · 2.53 KB
/
reflect.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
package prototest
import (
"errors"
"io"
"reflect"
"time"
"github.com/deanMdreon/kafka-go/protocol"
)
var (
recordReader = reflect.TypeOf((*protocol.RecordReader)(nil)).Elem()
)
func closeMessage(m protocol.Message) {
forEachField(reflect.ValueOf(m), func(v reflect.Value) {
if v.Type().Implements(recordReader) {
rr := v.Interface().(protocol.RecordReader)
for {
r, err := rr.ReadRecord()
if err != nil {
break
}
if r.Key != nil {
r.Key.Close()
}
if r.Value != nil {
r.Value.Close()
}
}
}
})
}
func load(v interface{}) (reset func()) {
return loadValue(reflect.ValueOf(v))
}
func loadValue(v reflect.Value) (reset func()) {
resets := []func(){}
forEachField(v, func(f reflect.Value) {
switch x := f.Interface().(type) {
case protocol.RecordReader:
records := loadRecords(x)
resetFunc := func() {
f.Set(reflect.ValueOf(protocol.NewRecordReader(makeRecords(records)...)))
}
resetFunc()
resets = append(resets, resetFunc)
}
})
return func() {
for _, f := range resets {
f()
}
}
}
func forEachField(v reflect.Value, do func(reflect.Value)) {
for v.Kind() == reflect.Ptr {
if v.IsNil() {
return
}
v = v.Elem()
}
switch v.Kind() {
case reflect.Slice:
for i, n := 0, v.Len(); i < n; i++ {
forEachField(v.Index(i), do)
}
case reflect.Struct:
for i, n := 0, v.NumField(); i < n; i++ {
forEachField(v.Field(i), do)
}
default:
do(v)
}
}
type memoryRecord struct {
offset int64
time time.Time
key []byte
value []byte
headers []protocol.Header
}
func (m *memoryRecord) Record() protocol.Record {
return protocol.Record{
Offset: m.offset,
Time: m.time,
Key: protocol.NewBytes(m.key),
Value: protocol.NewBytes(m.value),
Headers: m.headers,
}
}
func makeRecords(memoryRecords []memoryRecord) []protocol.Record {
records := make([]protocol.Record, len(memoryRecords))
for i, m := range memoryRecords {
records[i] = m.Record()
}
return records
}
func loadRecords(r protocol.RecordReader) []memoryRecord {
records := []memoryRecord{}
for {
rec, err := r.ReadRecord()
if err != nil {
if errors.Is(err, io.EOF) {
return records
}
panic(err)
}
records = append(records, memoryRecord{
offset: rec.Offset,
time: rec.Time,
key: readAll(rec.Key),
value: readAll(rec.Value),
headers: rec.Headers,
})
}
}
func readAll(bytes protocol.Bytes) []byte {
if bytes != nil {
defer bytes.Close()
}
b, err := protocol.ReadAll(bytes)
if err != nil {
panic(err)
}
return b
}