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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 node
import (
"context"
"errors"
"github.com/algorand/go-algorand/agreement"
"github.com/algorand/go-algorand/catchup"
"github.com/algorand/go-algorand/data"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/data/bookkeeping"
"github.com/algorand/go-algorand/ledger"
"github.com/algorand/go-algorand/logging"
"github.com/algorand/go-algorand/network"
"github.com/algorand/go-algorand/util/execpool"
)
// TODO these implementations should be pushed down into the corresponding structs or alternatively turned into new structs in the correct subpackages
type blockAuthenticatorImpl struct {
*data.Ledger
*agreement.AsyncVoteVerifier
}
func (i blockAuthenticatorImpl) Authenticate(block *bookkeeping.Block, cert *agreement.Certificate) error {
return cert.Authenticate(*block, i.Ledger, i.AsyncVoteVerifier)
}
func (i blockAuthenticatorImpl) Quit() {
i.AsyncVoteVerifier.Quit()
}
type blockValidatorImpl struct {
l *data.Ledger
verificationPool execpool.BacklogPool
}
// Validate implements BlockValidator.Validate.
func (i blockValidatorImpl) Validate(ctx context.Context, e bookkeeping.Block) (agreement.ValidatedBlock, error) {
b := &e
lvb, err := i.l.Validate(ctx, *b, i.verificationPool)
if err != nil {
return nil, err
}
return validatedBlock{vb: lvb}, nil
}
// agreementLedger implements the agreement.Ledger interface.
type agreementLedger struct {
*data.Ledger
UnmatchedPendingCertificates chan catchup.PendingUnmatchedCertificate
n network.GossipNode
}
func makeAgreementLedger(ledger *data.Ledger, net network.GossipNode) agreementLedger {
return agreementLedger{
Ledger: ledger,
UnmatchedPendingCertificates: make(chan catchup.PendingUnmatchedCertificate, 1),
n: net,
}
}
// EnsureBlock implements agreement.LedgerWriter.EnsureBlock.
func (l agreementLedger) EnsureBlock(e bookkeeping.Block, c agreement.Certificate) {
l.Ledger.EnsureBlock(&e, c)
// let the network know that we've made some progress.
l.n.OnNetworkAdvance()
}
// EnsureValidatedBlock implements agreement.LedgerWriter.EnsureValidatedBlock.
func (l agreementLedger) EnsureValidatedBlock(ve agreement.ValidatedBlock, c agreement.Certificate) {
l.Ledger.EnsureValidatedBlock(ve.(validatedBlock).vb, c)
// let the network know that we've made some progress.
l.n.OnNetworkAdvance()
}
// EnsureDigest implements agreement.LedgerWriter.EnsureDigest.
func (l agreementLedger) EnsureDigest(cert agreement.Certificate, verifier *agreement.AsyncVoteVerifier) {
// let the network know that we've made some progress.
// this might be controverasl since we haven't received the entire block, but we did get the
// certificate, which means that network connections are likely to be just fine.
l.n.OnNetworkAdvance()
// clear out the pending certificates ( if any )
select {
case pendingCert := <-l.UnmatchedPendingCertificates:
logging.Base().Debugf("agreementLedger.EnsureDigest has flushed out pending request for certificate for round %d in favor of recent certificate for round %d", pendingCert.Cert.Round, cert.Round)
default:
}
// The channel send to UnmatchedPendingCertificates is guaranteed to be non-blocking since due to the fact that -
// 1. the channel capacity is 1
// 2. we just cleared a single item off this channel ( if there was any )
// 3. the EnsureDigest method is being called with the agreement service guarantee
// 4. no other senders to this channel exists
l.UnmatchedPendingCertificates <- catchup.PendingUnmatchedCertificate{Cert: cert, VoteVerifier: verifier}
}
// Wrapping error with a LedgerDroppedRoundError when an old round is requested but the ledger has already dropped the entry
func (l agreementLedger) LookupAgreement(rnd basics.Round, addr basics.Address) (basics.OnlineAccountData, error) {
record, err := l.Ledger.LookupAgreement(rnd, addr)
var e *ledger.RoundOffsetError
if errors.As(err, &e) {
err = &agreement.LedgerDroppedRoundError{
Err: err,
}
}
return record, err
}
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