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decoder.go
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329 lines (314 loc) · 8.85 KB
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package rapidash
import (
"bytes"
"time"
"github.com/blastrain/msgpack"
"golang.org/x/xerrors"
)
type Decoder interface {
Len() int
At(int) Decoder
Int(string) int
Int8(string) int8
Int16(string) int16
Int32(string) int32
Int64(string) int64
Uint(string) uint
Uint8(string) uint8
Uint16(string) uint16
Uint32(string) uint32
Uint64(string) uint64
Float32(string) float32
Float64(string) float64
Bool(string) bool
String(string) string
Bytes(string) []byte
Time(string) time.Time
Slice(string, Unmarshaler)
Struct(string, Unmarshaler)
IntPtr(string) *int
Int8Ptr(string) *int8
Int16Ptr(string) *int16
Int32Ptr(string) *int32
Int64Ptr(string) *int64
UintPtr(string) *uint
Uint8Ptr(string) *uint8
Uint16Ptr(string) *uint16
Uint32Ptr(string) *uint32
Uint64Ptr(string) *uint64
Float32Ptr(string) *float32
Float64Ptr(string) *float64
BoolPtr(string) *bool
StringPtr(string) *string
BytesPtr(string) *[]byte
TimePtr(string) *time.Time
Ints(string) []int
Int8s(string) []int8
Int16s(string) []int16
Int32s(string) []int32
Int64s(string) []int64
Uints(string) []uint
Uint8s(string) []uint8
Uint16s(string) []uint16
Uint32s(string) []uint32
Uint64s(string) []uint64
Float32s(string) []float32
Float64s(string) []float64
Bools(string) []bool
Strings(string) []string
Times(string) []time.Time
Error() error
}
type PrimaryKeyDecoder struct {
buf *bytes.Buffer
dec *msgpack.Decoder
}
func (d *PrimaryKeyDecoder) SetBuffer(content []byte) {
d.buf.Reset()
d.buf.Write(content)
d.dec.SetReader(d.buf)
}
func (d *PrimaryKeyDecoder) Decode() (string, error) {
var primaryKey string
if err := d.dec.DecodeString(&primaryKey); err != nil {
return "", xerrors.Errorf("failed to decode primary key: %w", err)
}
return primaryKey, nil
}
func NewPrimaryKeyDecoder(buf *bytes.Buffer) *PrimaryKeyDecoder {
return &PrimaryKeyDecoder{
buf: buf,
dec: msgpack.NewDecoder(buf),
}
}
type ValueDecoder struct {
typ *Struct
columns []string
dec *msgpack.Decoder
buf *bytes.Buffer
valueFactory *ValueFactory
decoderMap map[TypeID]func(*StructField) (*Value, error)
}
func NewDecoder(s *Struct, buf *bytes.Buffer, valueFactory *ValueFactory) *ValueDecoder {
dec := msgpack.NewDecoder(buf)
d := &ValueDecoder{
typ: s,
dec: dec,
columns: s.Columns(),
buf: buf,
valueFactory: valueFactory,
}
d.decoderMap = map[TypeID]func(*StructField) (*Value, error){
IntType: func(*StructField) (*Value, error) {
var v int
if err := dec.DecodeInt(&v); err != nil {
return nil, xerrors.Errorf("failed to decode int: %w", err)
}
return valueFactory.CreateIntValue(v), nil
},
Int8Type: func(*StructField) (*Value, error) {
var v int8
if err := dec.DecodeInt8(&v); err != nil {
return nil, xerrors.Errorf("failed to decode int8: %w", err)
}
return valueFactory.CreateInt8Value(v), nil
},
Int16Type: func(*StructField) (*Value, error) {
var v int16
if err := dec.DecodeInt16(&v); err != nil {
return nil, xerrors.Errorf("failed to decode int16: %w", err)
}
return valueFactory.CreateInt16Value(v), nil
},
Int32Type: func(*StructField) (*Value, error) {
var v int32
if err := dec.DecodeInt32(&v); err != nil {
return nil, xerrors.Errorf("failed to decode int32: %w", err)
}
return valueFactory.CreateInt32Value(v), nil
},
Int64Type: func(*StructField) (*Value, error) {
var v int64
if err := dec.DecodeInt64(&v); err != nil {
return nil, xerrors.Errorf("failed to decode int64: %w", err)
}
return valueFactory.CreateInt64Value(v), nil
},
UintType: func(*StructField) (*Value, error) {
var v uint
if err := dec.DecodeUint(&v); err != nil {
return nil, xerrors.Errorf("failed to decode uint: %w", err)
}
return valueFactory.CreateUintValue(v), nil
},
Uint8Type: func(*StructField) (*Value, error) {
var v uint8
if err := dec.DecodeUint8(&v); err != nil {
return nil, xerrors.Errorf("failed to decode uint8: %w", err)
}
return valueFactory.CreateUint8Value(v), nil
},
Uint16Type: func(*StructField) (*Value, error) {
var v uint16
if err := dec.DecodeUint16(&v); err != nil {
return nil, xerrors.Errorf("failed to decode uint16: %w", err)
}
return valueFactory.CreateUint16Value(v), nil
},
Uint32Type: func(*StructField) (*Value, error) {
var v uint32
if err := dec.DecodeUint32(&v); err != nil {
return nil, xerrors.Errorf("failed to decode uint32: %w", err)
}
return valueFactory.CreateUint32Value(v), nil
},
Uint64Type: func(*StructField) (*Value, error) {
var v uint64
if err := dec.DecodeUint64(&v); err != nil {
return nil, xerrors.Errorf("failed to decode uint64: %w", err)
}
return valueFactory.CreateUint64Value(v), nil
},
Float32Type: func(*StructField) (*Value, error) {
var v float32
if err := dec.DecodeFloat32(&v); err != nil {
return nil, xerrors.Errorf("failed to decode float32: %w", err)
}
return valueFactory.CreateFloat32Value(v), nil
},
Float64Type: func(*StructField) (*Value, error) {
var v float64
if err := dec.DecodeFloat64(&v); err != nil {
return nil, xerrors.Errorf("failed to decode float64: %w", err)
}
return valueFactory.CreateFloat64Value(v), nil
},
BoolType: func(*StructField) (*Value, error) {
var v bool
if err := dec.DecodeBool(&v); err != nil {
return nil, xerrors.Errorf("failed to decode bool: %w", err)
}
return valueFactory.CreateBoolValue(v), nil
},
StringType: func(*StructField) (*Value, error) {
var v string
if err := dec.DecodeString(&v); err != nil {
return nil, xerrors.Errorf("failed to decode string: %w", err)
}
return valueFactory.CreateStringValue(v), nil
},
BytesType: func(*StructField) (*Value, error) {
var v []byte
if err := dec.DecodeBytes(&v); err != nil {
return nil, xerrors.Errorf("failed to decode []byte: %w", err)
}
return valueFactory.CreateBytesValue(v), nil
},
TimeType: func(*StructField) (*Value, error) {
var v time.Time
if err := dec.DecodeTime(&v); err != nil {
return nil, xerrors.Errorf("failed to decode time.Time: %w", err)
}
return valueFactory.CreateTimeValue(v), nil
},
SliceType: d.decodeSliceValue,
StructType: d.decodeStructValue,
}
return d
}
func (d *ValueDecoder) SetBuffer(content []byte) {
d.buf.Reset()
d.buf.Write(content)
d.dec.SetReader(d.buf)
}
func (d *ValueDecoder) decodeStructValue(field *StructField) (*Value, error) {
structType := field.subtypeStruct
value := &StructValue{
typ: structType,
fields: map[string]*Value{},
}
for _, column := range structType.Columns() {
v, err := d.decodeValue(structType.fields[column])
if err != nil {
return nil, xerrors.Errorf("failed to decode value: %w", err)
}
value.fields[column] = v
}
return StructValueToValue(value), nil
}
func (d *ValueDecoder) decodeSliceValue(field *StructField) (*Value, error) {
var len int
if err := d.dec.DecodeArrayLength(&len); err != nil {
return nil, xerrors.Errorf("failed to decode array length: %w", err)
}
values := []*Value{}
subField := &StructField{
typ: field.subtype,
column: field.column,
index: field.index,
subtypeStruct: field.subtypeStruct,
}
for i := 0; i < len; i++ {
v, err := d.decodeValue(subField)
if err != nil {
return nil, xerrors.Errorf("failed to decode value: %w", err)
}
values = append(values, v)
}
return ValuesToValue(values), nil
}
func (d *ValueDecoder) decodeValue(field *StructField) (*Value, error) {
dec := d.dec
code, err := dec.PeekCode()
if err != nil {
return nil, xerrors.Errorf("failed to get peek code: %w", err)
}
if code == msgpack.Nil {
var v interface{}
if err := dec.DecodeNil(&v); err != nil {
return nil, xerrors.Errorf("failed to decode nil: %w", err)
}
return nilValue, nil
}
value, err := d.decoderMap[field.typ](field)
if err != nil {
return nil, xerrors.Errorf("failed to decode: %w", err)
}
return value, nil
}
func (d *ValueDecoder) Decode() (*StructValue, error) {
value := &StructValue{
typ: d.typ,
fields: make(map[string]*Value, len(d.columns)),
}
for _, column := range d.columns {
v, err := d.decodeValue(d.typ.fields[column])
if err != nil {
return nil, xerrors.Errorf("failed to decode value: %w", err)
}
value.fields[column] = v
}
return value, nil
}
func (d *ValueDecoder) DecodeSlice() (*StructSliceValue, error) {
values := NewStructSliceValue()
var len int
if err := d.dec.DecodeArrayLength(&len); err != nil {
return nil, xerrors.Errorf("failed to decode array length: %w", err)
}
for i := 0; i < len; i++ {
value := &StructValue{
typ: d.typ,
fields: map[string]*Value{},
}
for _, column := range d.columns {
v, err := d.decodeValue(d.typ.fields[column])
if err != nil {
return nil, xerrors.Errorf("failed to decode value: %w", err)
}
value.fields[column] = v
}
values.Append(value)
}
return values, nil
}