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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 ledger
import (
"context"
"database/sql"
"fmt"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/data/bookkeeping"
"github.com/algorand/go-algorand/data/transactions"
"github.com/algorand/go-algorand/ledger/ledgercore"
)
const initialLastValidArrayLen = 256
type roundTxMembers struct {
txleases map[ledgercore.Txlease]basics.Round // map of transaction lease to when it expires
proto config.ConsensusParams
}
type txTail struct {
recent map[basics.Round]roundTxMembers
lastValid map[basics.Round]map[transactions.Txid]struct{} // map tx.LastValid -> tx confirmed set
// duplicate detection queries with LastValid before
// lowWaterMark are not guaranteed to succeed
lowWaterMark basics.Round // the last round known to be committed to disk
}
func (t *txTail) loadFromDisk(l ledgerForTracker, _ basics.Round) error {
latest := l.Latest()
hdr, err := l.BlockHdr(latest)
if err != nil {
return fmt.Errorf("txTail: could not get latest block header: %v", err)
}
proto := config.Consensus[hdr.CurrentProtocol]
// If the latest round is R, then any transactions from blocks strictly older than
// R + 1 - proto.MaxTxnLife
// could not be valid in the next round (R+1), and so are irrelevant.
// Thus we load the txids from blocks R+1-maxTxnLife to R, inclusive
old := (latest + 1).SubSaturate(basics.Round(proto.MaxTxnLife))
t.lowWaterMark = latest
t.lastValid = make(map[basics.Round]map[transactions.Txid]struct{})
t.recent = make(map[basics.Round]roundTxMembers)
// the roundsLastValids is a temporary map used during the execution of
// loadFromDisk, allowing us to construct the lastValid maps in their
// optimal size. This would ensure that upon startup, we don't preallocate
// more memory than we truly need.
roundsLastValids := make(map[basics.Round][]transactions.Txid)
for ; old <= latest; old++ {
blk, err := l.Block(old)
if err != nil {
return err
}
payset, err := blk.DecodePaysetFlat()
if err != nil {
return err
}
consensusParams := config.Consensus[blk.CurrentProtocol]
t.recent[old] = roundTxMembers{
txleases: make(map[ledgercore.Txlease]basics.Round, len(payset)),
proto: consensusParams,
}
for _, txad := range payset {
tx := txad.SignedTxn
if consensusParams.SupportTransactionLeases && (tx.Txn.Lease != [32]byte{}) {
t.recent[old].txleases[ledgercore.Txlease{Sender: tx.Txn.Sender, Lease: tx.Txn.Lease}] = tx.Txn.LastValid
}
if tx.Txn.LastValid > t.lowWaterMark {
list := roundsLastValids[tx.Txn.LastValid]
// if the list reached capacity, resize.
if len(list) == cap(list) {
var newList []transactions.Txid
if cap(list) == 0 {
newList = make([]transactions.Txid, 0, initialLastValidArrayLen)
} else {
newList = make([]transactions.Txid, len(list), len(list)*2)
}
copy(newList[:], list[:])
list = newList
}
list = append(list, tx.ID())
roundsLastValids[tx.Txn.LastValid] = list
}
}
}
// add all the entries in roundsLastValids to their corresponding map entry in t.lastValid
for lastValid, list := range roundsLastValids {
lastValueMap := make(map[transactions.Txid]struct{}, len(list))
for _, id := range list {
lastValueMap[id] = struct{}{}
}
t.lastValid[lastValid] = lastValueMap
}
return nil
}
func (t *txTail) close() {
}
func (t *txTail) newBlock(blk bookkeeping.Block, delta ledgercore.StateDelta) {
rnd := blk.Round()
if _, has := t.recent[rnd]; has {
// Repeat, ignore
return
}
t.recent[rnd] = roundTxMembers{
txleases: delta.Txleases,
proto: config.Consensus[blk.CurrentProtocol],
}
for txid, lv := range delta.Txids {
t.putLV(lv, txid)
}
}
func (t *txTail) committedUpTo(rnd basics.Round) (retRound, lookback basics.Round) {
maxlife := basics.Round(t.recent[rnd].proto.MaxTxnLife)
for r := range t.recent {
if r+maxlife < rnd {
delete(t.recent, r)
}
}
for ; t.lowWaterMark < rnd; t.lowWaterMark++ {
delete(t.lastValid, t.lowWaterMark)
}
return (rnd + 1).SubSaturate(maxlife), basics.Round(0)
}
func (t *txTail) prepareCommit(*deferredCommitContext) error {
return nil
}
func (t *txTail) commitRound(context.Context, *sql.Tx, *deferredCommitContext) error {
return nil
}
func (t *txTail) postCommit(ctx context.Context, dcc *deferredCommitContext) {
}
func (t *txTail) handleUnorderedCommit(uint64, basics.Round, basics.Round) {
}
func (t *txTail) produceCommittingTask(committedRound basics.Round, dbRound basics.Round, dcr *deferredCommitRange) *deferredCommitRange {
return dcr
}
// txtailMissingRound is returned by checkDup when requested for a round number below the low watermark
type txtailMissingRound struct {
round basics.Round
}
// Error satisfies builtin interface `error`
func (t txtailMissingRound) Error() string {
return fmt.Sprintf("txTail: tried to check for dup in missing round %d", t.round)
}
// checkDup test to see if the given transaction id/lease already exists. It returns nil if neither exists, or
// TransactionInLedgerError / LeaseInLedgerError respectively.
func (t *txTail) checkDup(proto config.ConsensusParams, current basics.Round, firstValid basics.Round, lastValid basics.Round, txid transactions.Txid, txl ledgercore.Txlease) error {
if lastValid < t.lowWaterMark {
return &txtailMissingRound{round: lastValid}
}
if proto.SupportTransactionLeases && (txl.Lease != [32]byte{}) {
firstChecked := firstValid
lastChecked := lastValid
if proto.FixTransactionLeases {
firstChecked = current.SubSaturate(basics.Round(proto.MaxTxnLife))
lastChecked = current
}
for rnd := firstChecked; rnd <= lastChecked; rnd++ {
expires, ok := t.recent[rnd].txleases[txl]
if ok && current <= expires {
return ledgercore.MakeLeaseInLedgerError(txid, txl)
}
}
}
if _, confirmed := t.lastValid[lastValid][txid]; confirmed {
return &ledgercore.TransactionInLedgerError{Txid: txid}
}
return nil
}
func (t *txTail) putLV(lastValid basics.Round, id transactions.Txid) {
if _, ok := t.lastValid[lastValid]; !ok {
t.lastValid[lastValid] = make(map[transactions.Txid]struct{})
}
t.lastValid[lastValid][id] = struct{}{}
}
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