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// Copyright (C) 2019-2021 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 txnsync
import (
"github.com/algorand/go-algorand/data/basics"
)
//msgp:ignore sentFilterStat
type sentFilterStat struct {
// .Modulator .Offset
EncodingParams requestParams
// lastCounter is the group counter of the last txn group included in a sent filter
lastCounter uint64
round basics.Round
}
// sentFilters is the set of filter stats for one peer to another peer.
// There should be at most one entry per (Modulator,Offset)
//msgp:ignore sentFilters
type sentFilters []sentFilterStat
const maxSentFilterSet = 10
func (sf *sentFilters) setSentFilter(filter bloomFilter, round basics.Round) {
encodingParams := filter.encoded.EncodingParams
for i, sfs := range *sf {
if sfs.EncodingParams == encodingParams {
(*sf)[i].lastCounter = filter.containedTxnsRange.lastCounter
(*sf)[i].round = round
return
}
}
nsf := sentFilterStat{
EncodingParams: encodingParams,
lastCounter: filter.containedTxnsRange.lastCounter,
round: round,
}
*sf = append(*sf, nsf)
// trim oldest content if we're too long
for len(*sf) > maxSentFilterSet {
oldestRound := round
popCandidate := -1
for i, sfs := range *sf {
if sfs.round < oldestRound {
oldestRound = sfs.round
popCandidate = i
}
}
if popCandidate >= 0 {
last := len(*sf) - 1
(*sf)[popCandidate] = (*sf)[last]
*sf = (*sf)[:last]
break
}
}
}
func (sf *sentFilters) nextFilterGroup(encodingParams requestParams) (lastCounter uint64, round basics.Round) {
for _, sfs := range *sf {
if sfs.EncodingParams == encodingParams {
return sfs.lastCounter + 1, sfs.round
}
}
return 0, 0 // include everything since the start
}
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