/
cache.go
216 lines (183 loc) · 5.27 KB
/
cache.go
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// Copyright (c) Faye Amacker. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.
package cbor
import (
"bytes"
"reflect"
"sort"
"strconv"
"strings"
"sync"
)
var (
decodingStructTypeCache sync.Map // map[reflect.Type]decodingStructType
encodingStructTypeCache sync.Map // map[reflect.Type]encodingStructType
encodeFuncCache sync.Map // map[reflect.Type]encodeFunc
)
type decodingStructType struct {
fields fields
toArray bool
}
func getDecodingStructType(t reflect.Type) decodingStructType {
if v, _ := decodingStructTypeCache.Load(t); v != nil {
return v.(decodingStructType)
}
flds, structOptions := getFields(t)
toArray := hasToArrayOption(structOptions)
for i := 0; i < len(flds); i++ {
flds[i].isUnmarshaler = implementsUnmarshaler(flds[i].typ)
}
structType := decodingStructType{fields: flds, toArray: toArray}
decodingStructTypeCache.Store(t, structType)
return structType
}
type encodingStructType struct {
fields fields
bytewiseCanonicalFields fields
lenFirstCanonicalFields fields
err error
toArray bool
omitEmpty bool
hasAnonymousField bool
}
func (st encodingStructType) getFields(opts EncOptions) fields {
switch opts.Sort {
case SortLengthFirst:
return st.lenFirstCanonicalFields
case SortBytewiseLexical:
return st.bytewiseCanonicalFields
}
return st.fields
}
type byBytewiseFields struct {
fields
}
func (x byBytewiseFields) Less(i, j int) bool {
return bytes.Compare(x.fields[i].cborName, x.fields[j].cborName) <= 0
}
type byLengthFirstFields struct {
fields
}
func (x byLengthFirstFields) Less(i, j int) bool {
if len(x.fields[i].cborName) != len(x.fields[j].cborName) {
return len(x.fields[i].cborName) < len(x.fields[j].cborName)
}
return bytes.Compare(x.fields[i].cborName, x.fields[j].cborName) <= 0
}
func getEncodingStructType(t reflect.Type) encodingStructType {
if v, _ := encodingStructTypeCache.Load(t); v != nil {
return v.(encodingStructType)
}
flds, structOptions := getFields(t)
if hasToArrayOption(structOptions) {
return getEncodingStructToArrayType(t, flds)
}
var err error
var omitEmpty bool
var hasAnonymousField bool
var hasKeyAsInt bool
var hasKeyAsStr bool
e := getEncodeState()
for i := 0; i < len(flds); i++ {
// Get field's encodeFunc
flds[i].ef = getEncodeFunc(flds[i].typ)
if flds[i].ef == nil {
err = &UnsupportedTypeError{t}
break
}
// Encode field name
if flds[i].keyAsInt {
nameAsInt, numErr := strconv.Atoi(flds[i].name)
if numErr != nil {
err = numErr
break
}
if nameAsInt >= 0 {
encodeHead(e, byte(cborTypePositiveInt), uint64(nameAsInt))
} else {
n := nameAsInt*(-1) - 1
encodeHead(e, byte(cborTypeNegativeInt), uint64(n))
}
flds[i].cborName = make([]byte, e.Len())
copy(flds[i].cborName, e.Bytes())
e.Reset()
hasKeyAsInt = true
} else {
encodeHead(e, byte(cborTypeTextString), uint64(len(flds[i].name)))
flds[i].cborName = make([]byte, e.Len()+len(flds[i].name))
n := copy(flds[i].cborName, e.Bytes())
copy(flds[i].cborName[n:], flds[i].name)
e.Reset()
hasKeyAsStr = true
}
// Check if field is from embedded struct
if len(flds[i].idx) > 1 {
hasAnonymousField = true
}
// Check if field can be omitted when empty
if flds[i].omitEmpty {
omitEmpty = true
}
}
putEncodeState(e)
if err != nil {
structType := encodingStructType{err: err}
encodingStructTypeCache.Store(t, structType)
return structType
}
// Sort fields by canonical order
bytewiseCanonicalFields := make(fields, len(flds))
copy(bytewiseCanonicalFields, flds)
sort.Sort(byBytewiseFields{bytewiseCanonicalFields})
lenFirstCanonicalFields := bytewiseCanonicalFields
if hasKeyAsInt && hasKeyAsStr {
lenFirstCanonicalFields = make(fields, len(flds))
copy(lenFirstCanonicalFields, flds)
sort.Sort(byLengthFirstFields{lenFirstCanonicalFields})
}
structType := encodingStructType{
fields: flds,
bytewiseCanonicalFields: bytewiseCanonicalFields,
lenFirstCanonicalFields: lenFirstCanonicalFields,
omitEmpty: omitEmpty,
hasAnonymousField: hasAnonymousField,
}
encodingStructTypeCache.Store(t, structType)
return structType
}
func getEncodingStructToArrayType(t reflect.Type, flds fields) encodingStructType {
var hasAnonymousField bool
for i := 0; i < len(flds); i++ {
// Get field's encodeFunc
flds[i].ef = getEncodeFunc(flds[i].typ)
if flds[i].ef == nil {
structType := encodingStructType{err: &UnsupportedTypeError{t}}
encodingStructTypeCache.Store(t, structType)
return structType
}
// Check if field is from embedded struct
if len(flds[i].idx) > 1 {
hasAnonymousField = true
}
}
structType := encodingStructType{
fields: flds,
toArray: true,
hasAnonymousField: hasAnonymousField,
}
encodingStructTypeCache.Store(t, structType)
return structType
}
func getEncodeFunc(t reflect.Type) encodeFunc {
if v, _ := encodeFuncCache.Load(t); v != nil {
return v.(encodeFunc)
}
f := getEncodeFuncInternal(t)
encodeFuncCache.Store(t, f)
return f
}
func hasToArrayOption(tag string) bool {
s := ",toarray"
idx := strings.Index(tag, s)
return idx >= 0 && (len(tag) == idx+len(s) || tag[idx+len(s)] == ',')
}