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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 agreement
import (
"fmt"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/data/committee"
"github.com/algorand/go-algorand/protocol"
)
// A Selector is the input used to define proposers and members of voting
// committees.
type selector struct {
_struct struct{} `codec:""` // not omitempty
Seed committee.Seed `codec:"seed"`
Round basics.Round `codec:"rnd"`
Period period `codec:"per"`
Step step `codec:"step"`
}
// ToBeHashed implements the crypto.Hashable interface.
func (sel selector) ToBeHashed() (protocol.HashID, []byte) {
return protocol.AgreementSelector, protocol.Encode(&sel)
}
// CommitteeSize returns the size of the committee, which is determined by
// Selector.Step.
func (sel selector) CommitteeSize(proto config.ConsensusParams) uint64 {
return sel.Step.committeeSize(proto)
}
func balanceRound(r basics.Round, cparams config.ConsensusParams) basics.Round {
return r.SubSaturate(basics.Round(2 * cparams.SeedRefreshInterval * cparams.SeedLookback))
}
func seedRound(r basics.Round, cparams config.ConsensusParams) basics.Round {
return r.SubSaturate(basics.Round(cparams.SeedLookback))
}
// a helper function for obtaining membership verification parameters.
func membership(l LedgerReader, addr basics.Address, r basics.Round, p period, s step) (m committee.Membership, err error) {
cparams, err := l.ConsensusParams(ParamsRound(r))
if err != nil {
return
}
balanceRound := balanceRound(r, cparams)
seedRound := seedRound(r, cparams)
record, err := l.LookupAgreement(balanceRound, addr)
if err != nil {
err = fmt.Errorf("Service.initializeVote (r=%d): Failed to obtain balance record for address %v in round %d: %w", r, addr, balanceRound, err)
return
}
total, err := l.Circulation(balanceRound, r)
if err != nil {
err = fmt.Errorf("Service.initializeVote (r=%d): Failed to obtain total circulation in round %d: %v", r, balanceRound, err)
return
}
seed, err := l.Seed(seedRound)
if err != nil {
err = fmt.Errorf("Service.initializeVote (r=%d): Failed to obtain seed in round %d: %v", r, seedRound, err)
return
}
m.Record = committee.BalanceRecord{OnlineAccountData: record, Addr: addr}
m.Selector = selector{Seed: seed, Round: r, Period: p, Step: s}
m.TotalMoney = total
return m, nil
}
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