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|
package prototest
import (
"bytes"
"errors"
"io"
"reflect"
"time"
"github.com/segmentio/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)
case io.Reader:
buf, _ := io.ReadAll(x)
resetFunc := func() {
f.Set(reflect.ValueOf(bytes.NewBuffer(buf)))
}
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
}
|
