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// Copyright (C) 2019-2024 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 (
"crypto/sha256"
"encoding/json"
"github.com/algorand/go-algorand/protocol"
)
type DuplicateMessageFilter struct {
NetworkFilter
NetworkFilterFactory
upstream UpstreamFilter
downstream DownstreamFilter
seenIncomingMessages map[[sha256.Size]byte]bool
}
func (n *DuplicateMessageFilter) SendMessage(sourceNode, targetNode int, tag protocol.Tag, data []byte) {
n.downstream.SendMessage(sourceNode, targetNode, tag, data)
}
func (n *DuplicateMessageFilter) GetDownstreamFilter() DownstreamFilter {
return n.downstream
}
func (n *DuplicateMessageFilter) ReceiveMessage(sourceNode int, tag protocol.Tag, data []byte) {
digest := sha256.Sum256(append([]byte(tag), data...))
if n.seenIncomingMessages[digest] {
return
}
n.seenIncomingMessages[digest] = true
n.upstream.ReceiveMessage(sourceNode, tag, data)
}
func (n *DuplicateMessageFilter) SetDownstreamFilter(f DownstreamFilter) {
n.downstream = f
}
func (n *DuplicateMessageFilter) SetUpstreamFilter(f UpstreamFilter) {
n.upstream = f
}
func (n *DuplicateMessageFilter) CreateFilter(nodeID int, fuzzer *Fuzzer) NetworkFilter {
return &DuplicateMessageFilter{
seenIncomingMessages: make(map[[sha256.Size]byte]bool),
}
}
func (n *DuplicateMessageFilter) Tick(newClockTime int) bool {
return n.upstream.Tick(newClockTime)
}
func (n *DuplicateMessageFilter) Unmarshal(b []byte) NetworkFilterFactory {
type duplicateMsgFilterJSON struct {
Name string
}
var jsonConfig duplicateMsgFilterJSON
if json.Unmarshal(b, &jsonConfig) != nil {
return nil
}
if jsonConfig.Name != "DuplicateMessageFilter" {
return nil
}
return &DuplicateMessageFilter{}
}
func init() {
registeredFilterFactories = append(registeredFilterFactories, &DuplicateMessageFilter{})
}
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