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value.go
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value.go
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package stored
import (
"fmt"
"reflect"
"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
)
type valueRaw map[string][]byte
type valueInterface map[string]interface{}
// Value is representation of the fetched raw object from the db
type Value struct {
object *Object
fetch func()
raw valueRaw
decoded valueInterface // decoded overwrites raw (used for primary)
err error
}
func (v *Value) get() {
if v.fetch != nil {
v.fetch()
v.fetch = nil
}
}
func (v *Value) fromRaw(raw valueRaw) {
v.raw = raw
//todelete
/*v.data = map[string]interface{}{}
for fieldName, binaryValue := range raw {
field, ok := v.object.fields[fieldName]
if !ok {
continue
}
v.data[fieldName] = field.ToInterface(binaryValue)
}*/
}
func (v *Value) fromKeyTuple(keysTuple tuple.Tuple) {
v.decoded = valueInterface{}
if len(keysTuple) != len(v.object.primaryFields) {
fmt.Println("FromKeyValue: incorrect primary key", keysTuple, "when", len(v.object.primaryFields))
return
}
for k, field := range v.object.primaryFields {
key := keysTuple[k]
v.decoded[field.Name] = key
}
}
// decodeBase should decode main part of the object
func (v *Value) decodeBase(value []byte) {
// do nothing for the moment
}
// FromKeyValue pasrses key value from foundationdb
func (v *Value) FromKeyValue(sub subspace.Subspace, rows []fdb.KeyValue) {
v.raw = valueRaw{}
for _, row := range rows {
key, err := sub.Unpack(row.Key)
if err != nil {
fmt.Println("key in invalid", err)
continue
}
if len(key) == 0 { // empty row
v.decodeBase(row.Value)
continue
}
fieldName, ok := key[0].(string)
if !ok {
fmt.Println("field is not string")
continue
}
if len(row.Value) > 0 {
v.raw[fieldName] = row.Value
}
}
// getting primary fields
keysTuple, err := v.object.primary.Unpack(sub.FDBKey())
if err != nil {
fmt.Println("FromKeyValue: unpack key err", err)
return
}
v.fromKeyTuple(keysTuple)
// todelete
/*v.data = map[string]interface{}{}
for _, row := range rows {
key, err := sub.Unpack(row.Key)
if err != nil || len(key) < 1 {
fmt.Println("key in invalid", err)
continue
}
fieldName, ok := key[0].(string)
if !ok {
fmt.Println("field is not string")
continue
}
field, ok := v.object.fields[fieldName]
if !ok {
fmt.Println("SKIP FIELD", fieldName)
continue
}
v.data[fieldName] = field.ToInterface(row.Value)
}*/
}
// Scan fills object with data from value
func (v *Value) Scan(objectPtr interface{}) error {
if v.fetch != nil {
v.fetch()
v.fetch = nil
}
if v.err != nil {
return v.err
}
value := structEditable(objectPtr)
value.Fill(v.object, v)
/*object := reflect.ValueOf(objectPtr).Elem()
for key, val := range v.data {
field, ok := v.object.fields[key]
if !ok {
continue
}
objField := object.Field(field.Num)
if !objField.CanSet() {
fmt.Println("Could not set object", key)
continue
}
interfaceValue := reflect.ValueOf(val)
objField.Set(interfaceValue)
}*/
return nil
}
// Reflect returns link to reflact value of object
func (v *Value) Reflect() (reflect.Value, error) {
if v.fetch != nil {
v.fetch()
v.fetch = nil
}
value := reflect.New(v.object.reflectType)
if v.err != nil {
return value, v.err
}
value = value.Elem()
for key, binaryValue := range v.raw {
field, ok := v.object.fields[key]
if !ok {
//fmt.Println("field not found", key, "of object", v.object.name)
continue
}
objField := value.Field(field.Num)
if !objField.CanSet() {
fmt.Println("Could not set object", key)
continue
}
//fmt.Println("filling interface", binaryValue)
val := field.ToInterface(binaryValue)
interfaceValue := reflect.ValueOf(val)
objField.Set(interfaceValue)
}
for key, interfaceValue := range v.decoded {
field, ok := v.object.fields[key]
if !ok {
continue
}
field.setTupleValue(value, interfaceValue)
}
return value, nil
}
// Err returns an error
func (v *Value) Err() error {
if v.fetch != nil {
v.fetch()
v.fetch = nil
}
return v.err
}
// Interface returns an interface
func (v *Value) Interface() interface{} {
refl, _ := v.Reflect()
return refl.Interface()
}