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core: restrict the maximum number of requests per URL

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This commit is contained in:
Anna Shaleva 2020-10-21 13:02:46 +03:00
parent 7c232e2ddc
commit 6685f8eba9
1 changed files with 6 additions and 0 deletions
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6
pkg/core/native/oracle.go
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@ -3,6 +3,7 @@ package native
import ( import (
"encoding/binary" "encoding/binary"
"errors" "errors"
"fmt"
"math/big" "math/big"
"github.com/nspcc-dev/neo-go/pkg/core/dao" "github.com/nspcc-dev/neo-go/pkg/core/dao"
@ -42,6 +43,8 @@ const (
maxFilterLength = 128 maxFilterLength = 128
maxCallbackLength = 32 maxCallbackLength = 32
maxUserDataLength = 512 maxUserDataLength = 512
// maxRequestsCount is the maximum number of requests per URL
maxRequestsCount = 256
oracleRequestPrice = 5000_0000 oracleRequestPrice = 5000_0000
) )
@ -329,6 +332,9 @@ func (o *Oracle) PutRequestInternal(id uint64, req *state.OracleRequest, d dao.D
if err := o.getSerializableFromDAO(d, key, lst); err != nil && !errors.Is(err, storage.ErrKeyNotFound) { if err := o.getSerializableFromDAO(d, key, lst); err != nil && !errors.Is(err, storage.ErrKeyNotFound) {
return err return err
} }
if len(*lst) >= maxRequestsCount {
return fmt.Errorf("there are too many pending requests for %s url", req.URL)
}
*lst = append(*lst, id) *lst = append(*lst, id)
si := &state.StorageItem{Value: lst.Bytes()} si := &state.StorageItem{Value: lst.Bytes()}
return d.PutStorageItem(o.ContractID, key, si) return d.PutStorageItem(o.ContractID, key, si)