/
utils.go
116 lines (96 loc) · 2.48 KB
/
utils.go
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package entity
import (
"bytes"
"database/sql/driver"
"fmt"
"io"
"github.com/klauspost/compress/zstd"
"github.com/modern-go/reflect2"
"github.com/samuelncui/yatm/tools"
"google.golang.org/protobuf/proto"
)
const (
compressThreshold = 1024
)
var (
magicHeaderV2 = []byte{0xff, 'y', 'm', '\x02'}
zstdEncoderPool = tools.NewPool(func() *zstd.Encoder {
encoder, _ := zstd.NewWriter(nil) // there will be no error without options
return encoder
})
zstdDecoderPool = tools.NewPool(func() *zstd.Decoder {
decoder, _ := zstd.NewReader(nil) // there will be no error without options
return decoder
})
)
// Scan implement database/sql.Scanner
func Scan(dst proto.Message, src interface{}) error {
typ := reflect2.TypeOf(dst).(reflect2.PtrType).Elem()
typ.Set(dst, typ.New())
var buf []byte
switch v := src.(type) {
case string:
buf = []byte(v)
case []byte:
buf = v
case nil:
return nil
default:
return fmt.Errorf("process define extra scanner, unexpected type for i18n, %T", v)
}
if len(buf) == 0 {
return nil
}
if bytes.HasPrefix(buf, magicHeaderV2) {
decoder := zstdDecoderPool.Get()
err := decoder.Reset(bytes.NewBuffer(buf[len(magicHeaderV2):]))
if err != nil {
return fmt.Errorf("zstd reset decoder fail, %w", err)
}
buf, err = io.ReadAll(decoder)
if err != nil {
return fmt.Errorf("zstd read decoder fail, %w", err)
}
decoder.Reset(nil)
zstdDecoderPool.Put(decoder)
}
if err := proto.Unmarshal(buf, dst); err != nil {
return fmt.Errorf("process define extra scanner, protobuf unmarshal fail, %w", err)
}
return nil
}
// Value implement database/sql/driver.Valuer
func Value(src proto.Message) (driver.Value, error) {
buf, err := proto.Marshal(src)
if err != nil {
return nil, fmt.Errorf("process define extra valuer, protobuf marshal fail, %w", err)
}
if len(buf) <= compressThreshold {
return buf, nil
}
buffer := bytes.NewBuffer(make([]byte, 0, len(buf)))
buffer.Write(magicHeaderV2)
encoder := zstdEncoderPool.Get()
encoder.Reset(buffer)
_, err = encoder.Write(buf)
if err != nil {
return nil, fmt.Errorf("zstd write to encoder fail, %w", err)
}
err = encoder.Close()
if err != nil {
return nil, fmt.Errorf("zstd close encoder fail, %w", err)
}
buf = buffer.Bytes()
encoder.Reset(nil)
zstdEncoderPool.Put(encoder)
return buf, nil
}
func ToEnum[T ~int32](pbmap map[string]int32, default_ T) func(str string) T {
return func(str string) T {
v, ok := pbmap[string(str)]
if !ok {
return default_
}
return T(v)
}
}