Documentation ¶
Index ¶
- func Marshal(v interface{}) ([]byte, error)
- func Register(value interface{}, enc encoderFunc, dec decoderFunc)
- func RegisterExt(id int8, value interface{})
- func Unmarshal(data []byte, v interface{}) error
- type CustomDecoder
- type CustomEncoder
- type Decoder
- func (d *Decoder) Buffered() io.Reader
- func (d *Decoder) Decode(v interface{}) error
- func (d *Decoder) DecodeArrayLen() (int, error)
- func (d *Decoder) DecodeBool() (bool, error)
- func (d *Decoder) DecodeBytes() ([]byte, error)
- func (d *Decoder) DecodeBytesLen() (int, error)
- func (d *Decoder) DecodeDuration() (time.Duration, error)
- func (d *Decoder) DecodeExtHeader() (typeID int8, length int, err error)
- func (d *Decoder) DecodeFloat32() (float32, error)
- func (d *Decoder) DecodeFloat64() (float64, error)
- func (d *Decoder) DecodeInt() (int, error)
- func (d *Decoder) DecodeInt16() (int16, error)
- func (d *Decoder) DecodeInt32() (int32, error)
- func (d *Decoder) DecodeInt64() (int64, error)
- func (d *Decoder) DecodeInt8() (int8, error)
- func (d *Decoder) DecodeInterface() (interface{}, error)
- func (d *Decoder) DecodeInterfaceLoose() (interface{}, error)
- func (d *Decoder) DecodeMap() (interface{}, error)
- func (d *Decoder) DecodeMapLen() (int, error)
- func (d *Decoder) DecodeMulti(v ...interface{}) error
- func (d *Decoder) DecodeNil() error
- func (d *Decoder) DecodeSlice() ([]interface{}, error)
- func (d *Decoder) DecodeString() (string, error)
- func (d *Decoder) DecodeTime() (time.Time, error)
- func (d *Decoder) DecodeUint() (uint, error)
- func (d *Decoder) DecodeUint16() (uint16, error)
- func (d *Decoder) DecodeUint32() (uint32, error)
- func (d *Decoder) DecodeUint64() (uint64, error)
- func (d *Decoder) DecodeUint8() (uint8, error)
- func (d *Decoder) DecodeValue(v reflect.Value) error
- func (d *Decoder) DisallowUnknownFields()
- func (d *Decoder) PeekCode() (codes.Code, error)
- func (d *Decoder) Query(query string) ([]interface{}, error)
- func (d *Decoder) Reset(r io.Reader)
- func (d *Decoder) SetDecodeMapFunc(fn func(*Decoder) (interface{}, error))
- func (d *Decoder) Skip() error
- func (d *Decoder) UseDecodeInterfaceLoose(on bool) *Decoder
- func (d *Decoder) UseJSONTag(on bool) *Decoder
- type Encoder
- func (e *Encoder) Encode(v interface{}) error
- func (e *Encoder) EncodeArrayLen(l int) error
- func (e *Encoder) EncodeBool(value bool) error
- func (e *Encoder) EncodeBytes(v []byte) error
- func (e *Encoder) EncodeBytesLen(l int) error
- func (e *Encoder) EncodeDuration(d time.Duration) error
- func (e *Encoder) EncodeExtHeader(typeID int8, length int) error
- func (e *Encoder) EncodeFloat32(n float32) error
- func (e *Encoder) EncodeFloat64(n float64) error
- func (e *Encoder) EncodeInt(n int64) error
- func (e *Encoder) EncodeInt16(n int16) error
- func (e *Encoder) EncodeInt32(n int32) error
- func (e *Encoder) EncodeInt64(n int64) error
- func (e *Encoder) EncodeInt8(n int8) error
- func (e *Encoder) EncodeMapLen(l int) error
- func (e *Encoder) EncodeMulti(v ...interface{}) error
- func (e *Encoder) EncodeNil() error
- func (e *Encoder) EncodeString(v string) error
- func (e *Encoder) EncodeTime(tm time.Time) error
- func (e *Encoder) EncodeUint(n uint64) error
- func (e *Encoder) EncodeUint16(n uint16) error
- func (e *Encoder) EncodeUint32(n uint32) error
- func (e *Encoder) EncodeUint64(n uint64) error
- func (e *Encoder) EncodeUint8(n uint8) error
- func (e *Encoder) EncodeValue(v reflect.Value) error
- func (e *Encoder) Reset(w io.Writer)
- func (e *Encoder) SortMapKeys(on bool) *Encoder
- func (e *Encoder) StructAsArray(on bool) *Encoder
- func (e *Encoder) UseCompactEncoding(on bool) *Encoder
- func (e *Encoder) UseCompactFloats(on bool)
- func (e *Encoder) UseJSONTag(on bool) *Encoder
- type Marshaler
- type Unmarshaler
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func Marshal ¶
Marshal returns the MessagePack encoding of v.
Example ¶
type Item struct { Foo string } b, err := msgpack.Marshal(&Item{Foo: "bar"}) if err != nil { panic(err) } var item Item err = msgpack.Unmarshal(b, &item) if err != nil { panic(err) } fmt.Println(item.Foo)
Output: bar
Example (AsArray) ¶
type Item struct { _msgpack struct{} `msgpack:",asArray"` Foo string Bar string } var buf bytes.Buffer enc := msgpack.NewEncoder(&buf) err := enc.Encode(&Item{Foo: "foo", Bar: "bar"}) if err != nil { panic(err) } dec := msgpack.NewDecoder(&buf) v, err := dec.DecodeInterface() if err != nil { panic(err) } fmt.Println(v)
Output: [foo bar]
Example (MapStringInterface) ¶
in := map[string]interface{}{"foo": 1, "hello": "world"} b, err := msgpack.Marshal(in) if err != nil { panic(err) } var out map[string]interface{} err = msgpack.Unmarshal(b, &out) if err != nil { panic(err) } fmt.Println("foo =", out["foo"]) fmt.Println("hello =", out["hello"])
Output: foo = 1 hello = world
Example (OmitEmpty) ¶
type Item struct { Foo string Bar string } item := &Item{ Foo: "hello", } b, err := msgpack.Marshal(item) if err != nil { panic(err) } fmt.Printf("item: %q\n", b) type ItemOmitEmpty struct { _msgpack struct{} `msgpack:",omitempty"` Foo string Bar string } itemOmitEmpty := &ItemOmitEmpty{ Foo: "hello", } b, err = msgpack.Marshal(itemOmitEmpty) if err != nil { panic(err) } fmt.Printf("item2: %q\n", b)
Output: item: "\x82\xa3Foo\xa5hello\xa3Bar\xa0" item2: "\x81\xa3Foo\xa5hello"
func Register ¶
func Register(value interface{}, enc encoderFunc, dec decoderFunc)
Register registers encoder and decoder functions for a value. This is low level API and in most cases you should prefer implementing Marshaler/CustomEncoder and Unmarshaler/CustomDecoder interfaces.
func RegisterExt ¶
func RegisterExt(id int8, value interface{})
RegisterExt records a type, identified by a value for that type, under the provided id. That id will identify the concrete type of a value sent or received as an interface variable. Only types that will be transferred as implementations of interface values need to be registered. Expecting to be used only during initialization, it panics if the mapping between types and ids is not a bijection.
Example ¶
package main import ( "encoding/binary" "fmt" "time" "github.com/MixinNetwork/msgpack/v4" ) func init() { msgpack.RegisterExt(1, (*EventTime)(nil)) } // https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1#eventtime-ext-format type EventTime struct { time.Time } var _ msgpack.Marshaler = (*EventTime)(nil) var _ msgpack.Unmarshaler = (*EventTime)(nil) func (tm *EventTime) MarshalMsgpack() ([]byte, error) { b := make([]byte, 8) binary.BigEndian.PutUint32(b, uint32(tm.Unix())) binary.BigEndian.PutUint32(b[4:], uint32(tm.Nanosecond())) return b, nil } func (tm *EventTime) UnmarshalMsgpack(b []byte) error { if len(b) == 1 && b[0] == 0xc0 { return nil } if len(b) != 8 { return fmt.Errorf("invalid data length: got %d, wanted 8", len(b)) } sec := binary.BigEndian.Uint32(b) usec := binary.BigEndian.Uint32(b[4:]) tm.Time = time.Unix(int64(sec), int64(usec)) return nil } func main() { b, err := msgpack.Marshal(&EventTime{time.Unix(123456789, 123)}) if err != nil { panic(err) } var v interface{} err = msgpack.Unmarshal(b, &v) if err != nil { panic(err) } fmt.Println(v.(*EventTime).UTC()) tm := new(EventTime) err = msgpack.Unmarshal(b, tm) if err != nil { panic(err) } fmt.Println(tm.UTC()) }
Output: 1973-11-29 21:33:09.000000123 +0000 UTC 1973-11-29 21:33:09.000000123 +0000 UTC
Types ¶
type CustomDecoder ¶
type CustomEncoder ¶
Example ¶
package main import ( "fmt" "github.com/MixinNetwork/msgpack/v4" ) type customStruct struct { S string N int } var _ msgpack.CustomEncoder = (*customStruct)(nil) var _ msgpack.CustomDecoder = (*customStruct)(nil) func (s *customStruct) EncodeMsgpack(enc *msgpack.Encoder) error { return enc.EncodeMulti(s.S, s.N) } func (s *customStruct) DecodeMsgpack(dec *msgpack.Decoder) error { return dec.DecodeMulti(&s.S, &s.N) } func main() { b, err := msgpack.Marshal(&customStruct{S: "hello", N: 42}) if err != nil { panic(err) } var v customStruct err = msgpack.Unmarshal(b, &v) if err != nil { panic(err) } fmt.Printf("%#v", v) }
Output: msgpack_test.customStruct{S:"hello", N:42}
type Decoder ¶
type Decoder struct {
// contains filtered or unexported fields
}
A Decoder reads and decodes MessagePack values from an input stream.
func NewDecoder ¶
NewDecoder returns a new decoder that reads from r.
The decoder introduces its own buffering and may read data from r beyond the MessagePack values requested. Buffering can be disabled by passing a reader that implements io.ByteScanner interface.
func (*Decoder) Buffered ¶
Buffered returns a reader of the data remaining in the Decoder's buffer. The reader is valid until the next call to Decode.
func (*Decoder) DecodeArrayLen ¶
DecodeArrayLen decodes array length. Length is -1 when array is nil.
func (*Decoder) DecodeBool ¶
func (*Decoder) DecodeBytes ¶
func (*Decoder) DecodeBytesLen ¶
func (*Decoder) DecodeExtHeader ¶
func (*Decoder) DecodeFloat32 ¶
func (*Decoder) DecodeFloat64 ¶
DecodeFloat64 decodes msgpack float32/64 into Go float64.
func (*Decoder) DecodeInt16 ¶
func (*Decoder) DecodeInt32 ¶
func (*Decoder) DecodeInt64 ¶
DecodeInt64 decodes msgpack int8/16/32/64 and uint8/16/32/64 into Go int64.
func (*Decoder) DecodeInt8 ¶
func (*Decoder) DecodeInterface ¶
DecodeInterface decodes value into interface. It returns following types:
- nil,
- bool,
- int8, int16, int32, int64,
- uint8, uint16, uint32, uint64,
- float32 and float64,
- string,
- []byte,
- slices of any of the above,
- maps of any of the above.
DecodeInterface should be used only when you don't know the type of value you are decoding. For example, if you are decoding number it is better to use DecodeInt64 for negative numbers and DecodeUint64 for positive numbers.
func (*Decoder) DecodeInterfaceLoose ¶
DecodeInterfaceLoose is like DecodeInterface except that:
- int8, int16, and int32 are converted to int64,
- uint8, uint16, and uint32 are converted to uint64,
- float32 is converted to float64.
func (*Decoder) DecodeMapLen ¶
DecodeMapLen decodes map length. Length is -1 when map is nil.
func (*Decoder) DecodeMulti ¶
func (*Decoder) DecodeSlice ¶
func (*Decoder) DecodeString ¶
func (*Decoder) DecodeUint ¶
func (*Decoder) DecodeUint16 ¶
func (*Decoder) DecodeUint32 ¶
func (*Decoder) DecodeUint64 ¶
DecodeUint64 decodes msgpack int8/16/32/64 and uint8/16/32/64 into Go uint64.
func (*Decoder) DecodeUint8 ¶
func (*Decoder) DisallowUnknownFields ¶
func (d *Decoder) DisallowUnknownFields()
DisallowUnknownFields causes the Decoder to return an error when the destination is a struct and the input contains object keys which do not match any non-ignored, exported fields in the destination.
func (*Decoder) PeekCode ¶
PeekCode returns the next MessagePack code without advancing the reader. Subpackage msgpack/codes contains list of available codes.
func (*Decoder) Query ¶
Query extracts data specified by the query from the msgpack stream skipping any other data. Query consists of map keys and array indexes separated with dot, e.g. key1.0.key2.
Example ¶
b, err := msgpack.Marshal([]map[string]interface{}{ {"id": 1, "attrs": map[string]interface{}{"phone": 12345}}, {"id": 2, "attrs": map[string]interface{}{"phone": 54321}}, }) if err != nil { panic(err) } dec := msgpack.NewDecoder(bytes.NewBuffer(b)) values, err := dec.Query("*.attrs.phone") if err != nil { panic(err) } fmt.Println("phones are", values) dec.Reset(bytes.NewBuffer(b)) values, err = dec.Query("1.attrs.phone") if err != nil { panic(err) } fmt.Println("2nd phone is", values[0])
Output: phones are [12345 54321] 2nd phone is 54321
func (*Decoder) Reset ¶
Reset discards any buffered data, resets all state, and switches the buffered reader to read from r.
func (*Decoder) SetDecodeMapFunc ¶
Example ¶
buf := new(bytes.Buffer) enc := msgpack.NewEncoder(buf) in := map[string]string{"hello": "world"} err := enc.Encode(in) if err != nil { panic(err) } dec := msgpack.NewDecoder(buf) // Causes decoder to produce map[string]string instead of map[string]interface{}. dec.SetDecodeMapFunc(func(d *msgpack.Decoder) (interface{}, error) { n, err := d.DecodeMapLen() if err != nil { return nil, err } m := make(map[string]string, n) for i := 0; i < n; i++ { mk, err := d.DecodeString() if err != nil { return nil, err } mv, err := d.DecodeString() if err != nil { return nil, err } m[mk] = mv } return m, nil }) out, err := dec.DecodeInterface() if err != nil { panic(err) } fmt.Printf("%#v", out)
Output: map[string]string{"hello":"world"}
func (*Decoder) UseDecodeInterfaceLoose ¶
UseDecodeInterfaceLoose causes decoder to use DecodeInterfaceLoose to decode msgpack value into Go interface{}.
func (*Decoder) UseJSONTag ¶
UseJSONTag causes the Decoder to use json struct tag as fallback option if there is no msgpack tag.
type Encoder ¶
type Encoder struct {
// contains filtered or unexported fields
}
func NewEncoder ¶
NewEncoder returns a new encoder that writes to w.
func (*Encoder) EncodeArrayLen ¶
func (*Encoder) EncodeBool ¶
func (*Encoder) EncodeBytes ¶
func (*Encoder) EncodeBytesLen ¶
func (*Encoder) EncodeFloat32 ¶
func (*Encoder) EncodeFloat64 ¶
func (*Encoder) EncodeInt ¶
EncodeNumber encodes an int64 in 1, 2, 3, 5, or 9 bytes. Type of the number is lost during encoding.
func (*Encoder) EncodeInt16 ¶
EncodeInt16 encodes an int16 in 3 bytes preserving type of the number.
func (*Encoder) EncodeInt32 ¶
EncodeInt32 encodes an int32 in 5 bytes preserving type of the number.
func (*Encoder) EncodeInt64 ¶
EncodeInt64 encodes an int64 in 9 bytes preserving type of the number.
func (*Encoder) EncodeInt8 ¶
EncodeInt8 encodes an int8 in 2 bytes preserving type of the number.
func (*Encoder) EncodeMapLen ¶
func (*Encoder) EncodeMulti ¶
func (*Encoder) EncodeString ¶
func (*Encoder) EncodeUint ¶
EncodeUnsignedNumber encodes an uint64 in 1, 2, 3, 5, or 9 bytes. Type of the number is lost during encoding.
func (*Encoder) EncodeUint16 ¶
EncodeUint16 encodes an uint16 in 3 bytes preserving type of the number.
func (*Encoder) EncodeUint32 ¶
EncodeUint32 encodes an uint16 in 5 bytes preserving type of the number.
func (*Encoder) EncodeUint64 ¶
EncodeUint64 encodes an uint16 in 9 bytes preserving type of the number.
func (*Encoder) EncodeUint8 ¶
EncodeUint8 encodes an uint8 in 2 bytes preserving type of the number.
func (*Encoder) SortMapKeys ¶
SortMapKeys causes the Encoder to encode map keys in increasing order. Supported map types are:
- map[string]string
- map[string]interface{}
func (*Encoder) StructAsArray ¶
StructAsArray causes the Encoder to encode Go structs as msgpack arrays.
func (*Encoder) UseCompactEncoding ¶
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 (*Encoder) UseCompactFloats ¶
UseCompactFloats causes the Encoder to chose a compact integer encoding for floats that can be represented as integers.
func (*Encoder) UseJSONTag ¶
UseJSONTag causes the Encoder to use json struct tag as fallback option if there is no msgpack tag.