forked from influxdata/telegraf
/
encoder_types.go
303 lines (250 loc) · 6.2 KB
/
encoder_types.go
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package encoding
import (
"encoding/base64"
"math"
"reflect"
"time"
)
// newTypeEncoder constructs an encoderFunc for a type.
// The returned encoder only checks CanAddr when allowAddr is true.
func newTypeEncoder(t reflect.Type, allowAddr bool) encoderFunc {
if t.Implements(marshalerType) {
return marshalerEncoder
}
if t.Kind() != reflect.Ptr && allowAddr {
if reflect.PtrTo(t).Implements(marshalerType) {
return newCondAddrEncoder(addrMarshalerEncoder, newTypeEncoder(t, false))
}
}
// Check for psuedo-types first
switch t {
case timeType:
return timePseudoTypeEncoder
}
switch t.Kind() {
case reflect.Bool:
return boolEncoder
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intEncoder
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return uintEncoder
case reflect.Float32, reflect.Float64:
return floatEncoder
case reflect.String:
return stringEncoder
case reflect.Interface:
return interfaceEncoder
case reflect.Struct:
return newStructEncoder(t)
case reflect.Map:
return newMapEncoder(t)
case reflect.Slice:
return newSliceEncoder(t)
case reflect.Array:
return newArrayEncoder(t)
case reflect.Ptr:
return newPtrEncoder(t)
default:
return unsupportedTypeEncoder
}
}
func invalidValueEncoder(v reflect.Value) interface{} {
return nil
}
func doNothingEncoder(v reflect.Value) interface{} {
return v.Interface()
}
func marshalerEncoder(v reflect.Value) interface{} {
if v.Kind() == reflect.Ptr && v.IsNil() {
return nil
}
m := v.Interface().(Marshaler)
ev, err := m.MarshalRQL()
if err != nil {
panic(&MarshalerError{v.Type(), err})
}
return ev
}
func addrMarshalerEncoder(v reflect.Value) interface{} {
va := v.Addr()
if va.IsNil() {
return nil
}
m := va.Interface().(Marshaler)
ev, err := m.MarshalRQL()
if err != nil {
panic(&MarshalerError{v.Type(), err})
}
return ev
}
func boolEncoder(v reflect.Value) interface{} {
if v.Bool() {
return true
} else {
return false
}
}
func intEncoder(v reflect.Value) interface{} {
return v.Int()
}
func uintEncoder(v reflect.Value) interface{} {
return v.Uint()
}
func floatEncoder(v reflect.Value) interface{} {
return v.Float()
}
func stringEncoder(v reflect.Value) interface{} {
return v.String()
}
func interfaceEncoder(v reflect.Value) interface{} {
if v.IsNil() {
return nil
}
return encode(v.Elem())
}
func unsupportedTypeEncoder(v reflect.Value) interface{} {
panic(&UnsupportedTypeError{v.Type()})
}
type structEncoder struct {
fields []field
fieldEncs []encoderFunc
}
func (se *structEncoder) encode(v reflect.Value) interface{} {
m := make(map[string]interface{})
for i, f := range se.fields {
fv := fieldByIndex(v, f.index)
if !fv.IsValid() || f.omitEmpty && se.isEmptyValue(fv) {
continue
}
m[f.name] = se.fieldEncs[i](fv)
}
return m
}
func (se *structEncoder) isEmptyValue(v reflect.Value) bool {
if v.Type() == timeType {
return v.Interface().(time.Time) == time.Time{}
}
return isEmptyValue(v)
}
func newStructEncoder(t reflect.Type) encoderFunc {
fields := cachedTypeFields(t)
se := &structEncoder{
fields: fields,
fieldEncs: make([]encoderFunc, len(fields)),
}
for i, f := range fields {
se.fieldEncs[i] = typeEncoder(typeByIndex(t, f.index))
}
return se.encode
}
type mapEncoder struct {
elemEnc encoderFunc
}
func (me *mapEncoder) encode(v reflect.Value) interface{} {
if v.IsNil() {
return nil
}
m := make(map[string]interface{})
for _, k := range v.MapKeys() {
m[k.String()] = me.elemEnc(v.MapIndex(k))
}
return m
}
func newMapEncoder(t reflect.Type) encoderFunc {
if t.Key().Kind() != reflect.String {
return unsupportedTypeEncoder
}
me := &mapEncoder{typeEncoder(t.Elem())}
return me.encode
}
// sliceEncoder just wraps an arrayEncoder, checking to make sure the value isn't nil.
type sliceEncoder struct {
arrayEnc encoderFunc
}
func (se *sliceEncoder) encode(v reflect.Value) interface{} {
if v.IsNil() {
return []interface{}{}
}
return se.arrayEnc(v)
}
func newSliceEncoder(t reflect.Type) encoderFunc {
// Byte slices get special treatment; arrays don't.
if t.Elem().Kind() == reflect.Uint8 {
return encodeByteSlice
}
enc := &sliceEncoder{newArrayEncoder(t)}
return enc.encode
}
type arrayEncoder struct {
elemEnc encoderFunc
}
func (ae *arrayEncoder) encode(v reflect.Value) interface{} {
n := v.Len()
a := make([]interface{}, n)
for i := 0; i < n; i++ {
a[i] = ae.elemEnc(v.Index(i))
}
return a
}
func newArrayEncoder(t reflect.Type) encoderFunc {
enc := &arrayEncoder{typeEncoder(t.Elem())}
return enc.encode
}
type ptrEncoder struct {
elemEnc encoderFunc
}
func (pe *ptrEncoder) encode(v reflect.Value) interface{} {
if v.IsNil() {
return nil
}
return pe.elemEnc(v.Elem())
}
func newPtrEncoder(t reflect.Type) encoderFunc {
enc := &ptrEncoder{typeEncoder(t.Elem())}
return enc.encode
}
type condAddrEncoder struct {
canAddrEnc, elseEnc encoderFunc
}
func (ce *condAddrEncoder) encode(v reflect.Value) interface{} {
if v.CanAddr() {
return ce.canAddrEnc(v)
} else {
return ce.elseEnc(v)
}
}
// newCondAddrEncoder returns an encoder that checks whether its value
// CanAddr and delegates to canAddrEnc if so, else to elseEnc.
func newCondAddrEncoder(canAddrEnc, elseEnc encoderFunc) encoderFunc {
enc := &condAddrEncoder{canAddrEnc: canAddrEnc, elseEnc: elseEnc}
return enc.encode
}
// Pseudo-type encoders
// Encode a time.Time value to the TIME RQL type
func timePseudoTypeEncoder(v reflect.Value) interface{} {
t := v.Interface().(time.Time)
timeVal := float64(t.UnixNano()) / float64(time.Second)
// use seconds-since-epoch precision if time.Time `t`
// is before the oldest nanosecond time
if t.Before(time.Unix(0, math.MinInt64)) {
timeVal = float64(t.Unix())
}
return map[string]interface{}{
"$reql_type$": "TIME",
"epoch_time": timeVal,
"timezone": "+00:00",
}
}
// Encode a byte slice to the BINARY RQL type
func encodeByteSlice(v reflect.Value) interface{} {
var b []byte
if !v.IsNil() {
b = v.Bytes()
}
dst := make([]byte, base64.StdEncoding.EncodedLen(len(b)))
base64.StdEncoding.Encode(dst, b)
return map[string]interface{}{
"$reql_type$": "BINARY",
"data": string(dst),
}
}