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interator.go
105 lines (85 loc) · 1.54 KB
/
interator.go
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package client
import (
"errors"
"github.com/Ankr-Shanghai/chainkv/retcode"
"github.com/Ankr-Shanghai/chainkv/types"
)
type Iterator struct {
client *client
idx types.ID
}
func (i *Iterator) Next() bool {
var (
req = &types.Request{
Type: types.REQ_TYPE_ITER_NEXT,
Id: i.idx,
}
rsp = &types.Response{Code: retcode.CodeOK}
)
err := i.client.do(req, rsp)
if err != nil {
return false
}
return rsp.Exist
}
func (i *Iterator) Key() []byte {
var (
req = &types.Request{
Type: types.REQ_TYPE_ITER_KEY,
Id: i.idx,
}
rsp = &types.Response{Code: retcode.CodeOK}
)
err := i.client.do(req, rsp)
if err != nil {
return nil
}
return rsp.Val
}
func (i *Iterator) Value() []byte {
var (
req = &types.Request{
Type: types.REQ_TYPE_ITER_VAL,
Id: i.idx,
}
rsp = &types.Response{Code: retcode.CodeOK}
)
err := i.client.do(req, rsp)
if err != nil {
return nil
}
return rsp.Val
}
func (i *Iterator) Error() error {
var (
req = &types.Request{
Type: types.REQ_TYPE_ITER_ERROR,
Id: i.idx,
}
rsp = &types.Response{Code: retcode.CodeOK}
)
err := i.client.do(req, rsp)
if err != nil {
return err
}
if rsp.Exist {
return errors.New("iterator error")
}
return nil
}
func (i *Iterator) Close() error {
var (
req = &types.Request{
Type: types.REQ_TYPE_ITER_CLOSE,
Id: i.idx,
}
rsp = &types.Response{Code: retcode.CodeOK}
)
err := i.client.do(req, rsp)
if err != nil {
return err
}
// should remove from iterMap
i.client.iterMap.Remove(i.idx.String())
return nil
}