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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 (
"errors"
"fmt"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/crypto"
"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"
)
// A ledger interface that Indexer implements. This is a simplified version of the
// ledgerForEvaluator interface. Certain functions that the evaluator doesn't use
// in the trusting mode are excluded, and the present functions only request data
// at the latest round.
type indexerLedgerForEval interface {
LatestBlockHdr() (bookkeeping.BlockHeader, error)
// The value of the returned map is nil iff the account was not found.
LookupWithoutRewards(map[basics.Address]struct{}) (map[basics.Address]*basics.AccountData, error)
GetAssetCreator(map[basics.AssetIndex]struct{}) (map[basics.AssetIndex]FoundAddress, error)
GetAppCreator(map[basics.AppIndex]struct{}) (map[basics.AppIndex]FoundAddress, error)
LatestTotals() (ledgercore.AccountTotals, error)
}
// Converter between indexerLedgerForEval and ledgerForEvaluator interfaces.
type indexerLedgerConnector struct {
il indexerLedgerForEval
genesisHash crypto.Digest
latestRound basics.Round
}
// BlockHdr is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) BlockHdr(round basics.Round) (bookkeeping.BlockHeader, error) {
if round != l.latestRound {
return bookkeeping.BlockHeader{}, fmt.Errorf(
"BlockHdr() evaluator called this function for the wrong round %d, "+
"latest round is %d",
round, l.latestRound)
}
return l.il.LatestBlockHdr()
}
// CheckDup is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) CheckDup(config.ConsensusParams, basics.Round, basics.Round, basics.Round, transactions.Txid, TxLease) error {
// This function is not used by evaluator.
return errors.New("CheckDup() not implemented")
}
// LookupWithoutRewards is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) LookupWithoutRewards(round basics.Round, address basics.Address) (basics.AccountData, basics.Round, error) {
accountDataMap, err :=
l.il.LookupWithoutRewards(map[basics.Address]struct{}{address: {}})
if err != nil {
return basics.AccountData{}, basics.Round(0), err
}
accountData := accountDataMap[address]
if accountData == nil {
return basics.AccountData{}, round, nil
}
return *accountData, round, nil
}
// GetCreatorForRound is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) GetCreatorForRound(_ basics.Round, cindex basics.CreatableIndex, ctype basics.CreatableType) (basics.Address, bool, error) {
var foundAddress FoundAddress
switch ctype {
case basics.AssetCreatable:
foundAddresses, err :=
l.il.GetAssetCreator(map[basics.AssetIndex]struct{}{basics.AssetIndex(cindex): {}})
if err != nil {
return basics.Address{}, false, err
}
foundAddress = foundAddresses[basics.AssetIndex(cindex)]
case basics.AppCreatable:
foundAddresses, err :=
l.il.GetAppCreator(map[basics.AppIndex]struct{}{basics.AppIndex(cindex): {}})
if err != nil {
return basics.Address{}, false, err
}
foundAddress = foundAddresses[basics.AppIndex(cindex)]
default:
return basics.Address{}, false, fmt.Errorf("unknown creatable type %v", ctype)
}
return foundAddress.Address, foundAddress.Exists, nil
}
// GenesisHash is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) GenesisHash() crypto.Digest {
return l.genesisHash
}
// Totals is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) LatestTotals() (rnd basics.Round, totals ledgercore.AccountTotals, err error) {
totals, err = l.il.LatestTotals()
rnd = l.latestRound
return
}
// CompactCertVoters is part of ledgerForEvaluator interface.
func (l indexerLedgerConnector) CompactCertVoters(_ basics.Round) (*VotersForRound, error) {
// This function is not used by evaluator.
return nil, errors.New("CompactCertVoters() not implemented")
}
func makeIndexerLedgerConnector(il indexerLedgerForEval, genesisHash crypto.Digest, latestRound basics.Round) indexerLedgerConnector {
return indexerLedgerConnector{
il: il,
genesisHash: genesisHash,
latestRound: latestRound,
}
}
// Returns all addresses referenced in `block`.
func getBlockAddresses(block *bookkeeping.Block) map[basics.Address]struct{} {
// Reserve a reasonable memory size for the map.
res := make(map[basics.Address]struct{}, len(block.Payset)+2)
res[block.FeeSink] = struct{}{}
res[block.RewardsPool] = struct{}{}
var refAddresses []basics.Address
for _, stib := range block.Payset {
getTxnAddresses(&stib.Txn, &refAddresses)
for _, address := range refAddresses {
res[address] = struct{}{}
}
}
return res
}
// EvalForIndexer evaluates a block without validation using the given `proto`.
// Return the state delta and transactions with modified apply data according to `proto`.
// This function is used by Indexer which modifies `proto` to retrieve the asset
// close amount for each transaction even when the real consensus parameters do not
// support it.
func EvalForIndexer(il indexerLedgerForEval, block *bookkeeping.Block, proto config.ConsensusParams) (ledgercore.StateDelta, []transactions.SignedTxnInBlock, error) {
ilc := makeIndexerLedgerConnector(il, block.GenesisHash(), block.Round()-1)
eval, err := startEvaluator(
ilc, block.BlockHeader, proto, len(block.Payset), false, false, 0)
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
// Preload most needed accounts.
{
accountDataMap, err := il.LookupWithoutRewards(getBlockAddresses(block))
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
base := eval.state.lookupParent.(*roundCowBase)
for address, accountData := range accountDataMap {
if accountData == nil {
base.accounts[address] = basics.AccountData{}
} else {
base.accounts[address] = *accountData
}
}
}
paysetgroups, err := block.DecodePaysetGroups()
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
for _, group := range paysetgroups {
err = eval.TransactionGroup(group)
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
}
// Finally, process any pending end-of-block state changes.
err = eval.endOfBlock()
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
// here, in the EvalForIndexer, we don't want to call finalValidation(). This would
// skip the calculation of the account totals in the state delta, which is a serious
// issue if it were to be used by algod, but it's perfectly fine for the indexer since
// it doesn't track any totals and therefore cannot calculate the new totals.
return eval.state.deltas(), eval.block.Payset, nil
}
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