mirror of https://github.com/status-im/op-geth.git
82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
package rlp
|
|
|
|
import (
|
|
"reflect"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
typeCacheMutex sync.RWMutex
|
|
typeCache = make(map[reflect.Type]*typeinfo)
|
|
)
|
|
|
|
type typeinfo struct {
|
|
decoder
|
|
writer
|
|
}
|
|
|
|
type decoder func(*Stream, reflect.Value) error
|
|
|
|
type writer func(reflect.Value, *encbuf) error
|
|
|
|
func cachedTypeInfo(typ reflect.Type) (*typeinfo, error) {
|
|
typeCacheMutex.RLock()
|
|
info := typeCache[typ]
|
|
typeCacheMutex.RUnlock()
|
|
if info != nil {
|
|
return info, nil
|
|
}
|
|
// not in the cache, need to generate info for this type.
|
|
typeCacheMutex.Lock()
|
|
defer typeCacheMutex.Unlock()
|
|
return cachedTypeInfo1(typ)
|
|
}
|
|
|
|
func cachedTypeInfo1(typ reflect.Type) (*typeinfo, error) {
|
|
info := typeCache[typ]
|
|
if info != nil {
|
|
// another goroutine got the write lock first
|
|
return info, nil
|
|
}
|
|
// put a dummmy value into the cache before generating.
|
|
// if the generator tries to lookup itself, it will get
|
|
// the dummy value and won't call itself recursively.
|
|
typeCache[typ] = new(typeinfo)
|
|
info, err := genTypeInfo(typ)
|
|
if err != nil {
|
|
// remove the dummy value if the generator fails
|
|
delete(typeCache, typ)
|
|
return nil, err
|
|
}
|
|
*typeCache[typ] = *info
|
|
return typeCache[typ], err
|
|
}
|
|
|
|
func structFields(typ reflect.Type) (fields []field, err error) {
|
|
for i := 0; i < typ.NumField(); i++ {
|
|
if f := typ.Field(i); f.PkgPath == "" { // exported
|
|
info, err := cachedTypeInfo1(f.Type)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
fields = append(fields, field{i, info})
|
|
}
|
|
}
|
|
return fields, nil
|
|
}
|
|
|
|
func genTypeInfo(typ reflect.Type) (info *typeinfo, err error) {
|
|
info = new(typeinfo)
|
|
if info.decoder, err = makeDecoder(typ); err != nil {
|
|
return nil, err
|
|
}
|
|
if info.writer, err = makeWriter(typ); err != nil {
|
|
return nil, err
|
|
}
|
|
return info, nil
|
|
}
|
|
|
|
func isUint(k reflect.Kind) bool {
|
|
return k >= reflect.Uint && k <= reflect.Uintptr
|
|
}
|