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field.go
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field.go
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package stored
import (
"fmt"
"github.com/vmihailenco/msgpack/v5"
"math/rand"
"reflect"
"strings"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
)
var typeOfBytes = reflect.TypeOf([]byte(nil))
// Field is main field structure
type Field struct {
object *Object
Name string
Num int
Kind reflect.Kind
SubKind reflect.Kind
Type reflect.StructField
Value reflect.Value
mutable bool
primary bool
AutoIncrement bool
GenID GenIDType // type of ID autogeneration, IDDate, IDRandom
UnStored bool // means this field would not be stored inside main object
}
// Tag is general object for tag parsing
type Tag struct {
Name string
Primary bool
mutable bool
unique bool
AutoIncrement bool
UnStored bool // means this field doesn't stored inside main object data
}
// ParseTag converts object stored tag to sturct with options
func (f *Field) ParseTag() *Tag {
tagStr := f.Type.Tag.Get("stored")
unstored := false
if tagStr == "" {
tagStr = f.Type.Tag.Get("unstored")
if tagStr == "" {
return nil
}
unstored = true
}
tagParts := strings.Split(tagStr, ",")
tag := Tag{
Name: tagParts[0],
UnStored: unstored,
}
if len(tagParts) > 1 {
for i := 1; i < len(tagParts); i++ {
part := strings.Trim(tagParts[i], " ")
switch part {
case "primary":
tag.Primary = true
case "mutable":
tag.mutable = true
case "unique":
tag.unique = true
case "autoincrement":
tag.AutoIncrement = true
default:
panic("tag «" + tag.Name + "» has unsupported ‘" + part + "’ option")
}
}
}
return &tag
}
// GetDefault return default value for this field
func (f *Field) GetDefault() interface{} {
switch f.Kind {
case reflect.String:
return ""
case reflect.Int:
return 0
case reflect.Uint:
return uint(0)
case reflect.Int32:
return int32(0)
case reflect.Uint32:
return uint32(0)
case reflect.Int64:
return int64(0)
case reflect.Uint64:
return uint64(0)
default:
panic("unsupported type for getdefault " + fmt.Sprintf("%v", f.Kind))
}
}
// isEmpty checks if element is empty
func (f *Field) isEmpty(value interface{}) bool {
if value == nil {
return true
}
switch f.Kind { // slices and maps will be nil if not set
case reflect.String:
return "" == value
case reflect.Int:
return 0 == value
case reflect.Int32:
return int32(0) == value
case reflect.Int64:
return int64(0) == value
case reflect.Uint:
return uint(0) == value
case reflect.Uint32:
return uint32(0) == value
case reflect.Uint64:
return uint64(0) == value
case reflect.Float32:
return float32(0.0) == value
case reflect.Float64:
return float64(0.0) == value
case reflect.Bool:
return false == value
default:
return false
}
}
// BytesFromObject return bytes using full object instead of field value
func (f *Field) BytesFromObject(objectValue interface{}) ([]byte, error) {
object := reflect.ValueOf(objectValue)
kind := object.Kind()
if kind == reflect.Ptr {
object = object.Elem()
kind = object.Kind()
}
if kind != reflect.Struct {
f.panic("object should be struct, not value")
}
fieldValue := object.Field(f.Num)
return f.ToBytes(fieldValue.Interface())
}
// ToBytes packs interface field value to bytes
func (f *Field) ToBytes(val interface{}) ([]byte, error) {
return msgpack.Marshal(val)
}
func (f *Field) tupleElement(val interface{}) tuple.TupleElement {
if f.Kind == reflect.Uint8 { // byte stored as byte array
return []byte{val.(byte)}
}
return val
}
func (f *Field) setTupleValue(value reflect.Value, interfaceValue interface{}) {
objField := value.Field(f.Num)
switch objField.Kind() {
case reflect.Int: // tuple store int as int64
interfaceValue = int(interfaceValue.(int64))
case reflect.Uint8:
bytes := interfaceValue.([]uint8)
if len(bytes) != 1 {
panic("incorrect key tuple")
}
interfaceValue = bytes[0]
case reflect.Uint64:
interfaceValue = uint64(interfaceValue.(int64))
}
objField.Set(reflect.ValueOf(interfaceValue))
}
func (f *Field) getKey(sub subspace.Subspace) fdb.Key {
return sub.Pack(tuple.Tuple{f.Name})
}
// ToInterface decodes field value
func (f *Field) ToInterface(obj []byte) interface{} {
var i interface{}
err := msgpack.Unmarshal(obj, &i)
if err != nil {
fmt.Println("ToInterface failed:", err)
}
return i
}
func SetToField(obj []byte, objField reflect.Value) {
i := objField.Addr().Interface()
err := msgpack.Unmarshal(obj, i)
if err != nil {
fmt.Println("SetToField failed:", err)
}
}
func (f *Field) panic(text string) {
panic("field «" + f.Name + "» " + text)
}
// SetAutoIncrement checks if everything ok for autoincrements
func (f *Field) SetAutoIncrement() {
switch f.Kind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64:
f.AutoIncrement = true
default:
f.panic("could not be autoincremented")
}
}
// SetID sets unique id before the add write
func (f *Field) SetID(idType GenIDType) {
switch f.Kind {
case reflect.Int64, reflect.Uint64:
f.GenID = idType
default:
f.panic("could not be autoincremented")
}
}
// GenerateID will return ID bytes for type specified
func (f *Field) GenerateID() int64 {
switch f.Kind {
case reflect.Int64, reflect.Uint64:
var id int64
switch f.GenID {
case GenIDDate:
id = ID64()
//id = time.Now().UnixNano()
//id += rand.Int63n(1000000) - 500000
case GenIDRandom:
id = rand.Int63()
default:
f.panic(fmt.Sprintf("GenID in undefined: %d", f.GenID))
}
return id
//data, _ := msgpack.Marshal(id) // no marshaling
//return data
}
return 0
}
func fieldsKey(fields []*Field) string {
var str []string
for _, f := range fields {
str = append(str, f.Name)
}
return strings.Join(str, ",")
}