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|
package msgpack
import (
"bytes"
"io"
"reflect"
"sync"
"time"
"github.com/vmihailenco/msgpack/v4/codes"
)
const (
sortMapKeysFlag uint32 = 1 << iota
structAsArrayFlag
encodeUsingJSONFlag
useCompactIntsFlag
useCompactFloatsFlag
)
type writer interface {
io.Writer
WriteByte(byte) error
}
type byteWriter struct {
io.Writer
buf [1]byte
}
func newByteWriter(w io.Writer) *byteWriter {
bw := new(byteWriter)
bw.Reset(w)
return bw
}
func (bw *byteWriter) Reset(w io.Writer) {
bw.Writer = w
}
func (bw *byteWriter) WriteByte(c byte) error {
bw.buf[0] = c
_, err := bw.Write(bw.buf[:])
return err
}
//------------------------------------------------------------------------------
var encPool = sync.Pool{
New: func() interface{} {
return NewEncoder(nil)
},
}
// Marshal returns the MessagePack encoding of v.
func Marshal(v interface{}) ([]byte, error) {
enc := encPool.Get().(*Encoder)
var buf bytes.Buffer
enc.Reset(&buf)
err := enc.Encode(v)
b := buf.Bytes()
encPool.Put(enc)
if err != nil {
return nil, err
}
return b, err
}
type Encoder struct {
w writer
buf []byte
timeBuf []byte
bootstrap [9 + 12]byte
intern map[string]int
flags uint32
}
// NewEncoder returns a new encoder that writes to w.
func NewEncoder(w io.Writer) *Encoder {
e := new(Encoder)
e.buf = e.bootstrap[:9]
e.timeBuf = e.bootstrap[9 : 9+12]
e.Reset(w)
return e
}
func (e *Encoder) Reset(w io.Writer) {
if bw, ok := w.(writer); ok {
e.w = bw
} else if bw, ok := e.w.(*byteWriter); ok {
bw.Reset(w)
} else {
e.w = newByteWriter(w)
}
for k := range e.intern {
delete(e.intern, k)
}
//TODO:
//e.sortMapKeys = false
//e.structAsArray = false
//e.useJSONTag = false
//e.useCompact = false
}
// SortMapKeys causes the Encoder to encode map keys in increasing order.
// Supported map types are:
// - map[string]string
// - map[string]interface{}
func (e *Encoder) SortMapKeys(on bool) *Encoder {
if on {
e.flags |= sortMapKeysFlag
} else {
e.flags &= ^sortMapKeysFlag
}
return e
}
// StructAsArray causes the Encoder to encode Go structs as msgpack arrays.
func (e *Encoder) StructAsArray(on bool) *Encoder {
if on {
e.flags |= structAsArrayFlag
} else {
e.flags &= ^structAsArrayFlag
}
return e
}
// UseJSONTag causes the Encoder to use json struct tag as fallback option
// if there is no msgpack tag.
func (e *Encoder) UseJSONTag(on bool) *Encoder {
if on {
e.flags |= encodeUsingJSONFlag
} else {
e.flags &= ^encodeUsingJSONFlag
}
return e
}
// UseCompactEncoding causes the Encoder to chose the most compact encoding.
// For example, it allows to encode small Go int64 as msgpack int8 saving 7 bytes.
func (e *Encoder) UseCompactEncoding(on bool) *Encoder {
if on {
e.flags |= useCompactIntsFlag
} else {
e.flags &= ^useCompactIntsFlag
}
return e
}
// UseCompactFloats causes the Encoder to chose a compact integer encoding
// for floats that can be represented as integers.
func (e *Encoder) UseCompactFloats(on bool) {
if on {
e.flags |= useCompactFloatsFlag
} else {
e.flags &= ^useCompactFloatsFlag
}
}
func (e *Encoder) Encode(v interface{}) error {
switch v := v.(type) {
case nil:
return e.EncodeNil()
case string:
return e.EncodeString(v)
case []byte:
return e.EncodeBytes(v)
case int:
return e.encodeInt64Cond(int64(v))
case int64:
return e.encodeInt64Cond(v)
case uint:
return e.encodeUint64Cond(uint64(v))
case uint64:
return e.encodeUint64Cond(v)
case bool:
return e.EncodeBool(v)
case float32:
return e.EncodeFloat32(v)
case float64:
return e.EncodeFloat64(v)
case time.Duration:
return e.encodeInt64Cond(int64(v))
case time.Time:
return e.EncodeTime(v)
}
return e.EncodeValue(reflect.ValueOf(v))
}
func (e *Encoder) EncodeMulti(v ...interface{}) error {
for _, vv := range v {
if err := e.Encode(vv); err != nil {
return err
}
}
return nil
}
func (e *Encoder) EncodeValue(v reflect.Value) error {
fn := getEncoder(v.Type())
return fn(e, v)
}
func (e *Encoder) EncodeNil() error {
return e.writeCode(codes.Nil)
}
func (e *Encoder) EncodeBool(value bool) error {
if value {
return e.writeCode(codes.True)
}
return e.writeCode(codes.False)
}
func (e *Encoder) EncodeDuration(d time.Duration) error {
return e.EncodeInt(int64(d))
}
func (e *Encoder) writeCode(c codes.Code) error {
return e.w.WriteByte(byte(c))
}
func (e *Encoder) write(b []byte) error {
_, err := e.w.Write(b)
return err
}
func (e *Encoder) writeString(s string) error {
_, err := e.w.Write(stringToBytes(s))
return err
}
|
