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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package fuzzer
import (
"encoding/json"
"github.com/algorand/go-algorand/protocol"
)
// Drop message filter will drop 1 out of X messages where X is the drop rate for the node.
type DropMessageFilter struct {
NetworkFilter
NetworkFilterFactory
upstream UpstreamFilter
downstream DownstreamFilter
nodeID int
upStreamDropRate map[int]uint64
downStreamDropRate map[int]uint64
receiveMessageCount uint64
sendMessageCount uint64
}
func MakeDropMessageFilter(upStreamDropRate map[int]uint64, downStreamDropRate map[int]uint64) *DropMessageFilter {
return &DropMessageFilter{
upStreamDropRate: upStreamDropRate,
downStreamDropRate: downStreamDropRate,
}
}
func (n *DropMessageFilter) SendMessage(sourceNode, targetNode int, tag protocol.Tag, data []byte) {
n.sendMessageCount++
if rate, has := n.downStreamDropRate[n.nodeID]; has {
if rate == 0 || n.sendMessageCount%rate != 0 {
n.downstream.SendMessage(sourceNode, targetNode, tag, data)
}
return
}
n.downstream.SendMessage(sourceNode, targetNode, tag, data)
}
func (n *DropMessageFilter) GetDownstreamFilter() DownstreamFilter {
return n.downstream
}
func (n *DropMessageFilter) ReceiveMessage(sourceNode int, tag protocol.Tag, data []byte) {
n.receiveMessageCount++
if rate, has := n.upStreamDropRate[n.nodeID]; has {
if rate == 0 || n.receiveMessageCount%rate != 0 {
n.upstream.ReceiveMessage(sourceNode, tag, data)
}
return
}
n.upstream.ReceiveMessage(sourceNode, tag, data)
}
func (n *DropMessageFilter) SetDownstreamFilter(f DownstreamFilter) {
n.downstream = f
}
func (n *DropMessageFilter) SetUpstreamFilter(f UpstreamFilter) {
n.upstream = f
}
func (n *DropMessageFilter) CreateFilter(nodeID int, fuzzer *Fuzzer) NetworkFilter {
return &DropMessageFilter{
nodeID: nodeID,
upStreamDropRate: n.upStreamDropRate,
downStreamDropRate: n.downStreamDropRate,
}
}
func (n *DropMessageFilter) Tick(newClockTime int) bool {
return n.upstream.Tick(newClockTime)
}
func (n *DropMessageFilter) Marshal() (bytes []byte, err error) {
bytes, err = json.Marshal(n)
return
}
// Unmarshall DropMessageFilter
func (n *DropMessageFilter) Unmarshal(b []byte) NetworkFilterFactory {
type dropMessageFilterJSON struct {
Name string
UpStreamDropRate map[int]uint64
DownStreamDropRate map[int]uint64
}
var jsonConfig dropMessageFilterJSON
if err := json.Unmarshal(b, &jsonConfig); err != nil {
return nil
}
if jsonConfig.Name != "DropMessageFilter" {
return nil
}
return &DropMessageFilter{
upStreamDropRate: jsonConfig.UpStreamDropRate,
downStreamDropRate: jsonConfig.DownStreamDropRate,
}
}
// register DropMessageFilter
func init() {
registeredFilterFactories = append(registeredFilterFactories, &DropMessageFilter{})
}
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