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// Copyright (C) 2019-2022 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/internal"
"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)
}
// FoundAddress is a wrapper for an address and a boolean.
type FoundAddress struct {
Address basics.Address
Exists bool
}
// EvalForIndexerResources contains resources preloaded from the Indexer database.
// Indexer is able to do the preloading more efficiently than the evaluator loading
// resources one by one.
type EvalForIndexerResources struct {
// The map value is nil iff the account does not exist. The account data is owned here.
Accounts map[basics.Address]*basics.AccountData
Creators map[Creatable]FoundAddress
}
// Creatable represent a single creatable object.
type Creatable struct {
Index basics.CreatableIndex
Type basics.CreatableType
}
// Converter between indexerLedgerForEval and ledgerForEvaluator interfaces.
type indexerLedgerConnector struct {
il indexerLedgerForEval
genesisHash crypto.Digest
genesisProto config.ConsensusParams
latestRound basics.Round
roundResources EvalForIndexerResources
}
// 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, ledgercore.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) {
// check to see if the account data in the cache.
if pad, has := l.roundResources.Accounts[address]; has {
if pad == nil {
return basics.AccountData{}, round, nil
}
return *pad, round, nil
}
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
var has bool
// check to see if the account data in the cache.
if foundAddress, has = l.roundResources.Creators[Creatable{Index: cindex, Type: ctype}]; has {
return foundAddress.Address, foundAddress.Exists, nil
}
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
}
// GenesisProto is part of LedgerForEvaluator interface.
func (l indexerLedgerConnector) GenesisProto() config.ConsensusParams {
return l.genesisProto
}
// 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) (*ledgercore.VotersForRound, error) {
// This function is not used by evaluator.
return nil, errors.New("CompactCertVoters() not implemented")
}
func makeIndexerLedgerConnector(il indexerLedgerForEval, genesisHash crypto.Digest, genesisProto config.ConsensusParams, latestRound basics.Round, roundResources EvalForIndexerResources) indexerLedgerConnector {
return indexerLedgerConnector{
il: il,
genesisHash: genesisHash,
genesisProto: genesisProto,
latestRound: latestRound,
roundResources: roundResources,
}
}
// 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, resources EvalForIndexerResources) (ledgercore.StateDelta, []transactions.SignedTxnInBlock, error) {
ilc := makeIndexerLedgerConnector(il, block.GenesisHash(), proto, block.Round()-1, resources)
eval, err := internal.StartEvaluator(
ilc, block.BlockHeader,
internal.EvaluatorOptions{
PaysetHint: len(block.Payset),
ProtoParams: &proto,
Generate: false,
Validate: false,
})
if err != nil {
return ledgercore.StateDelta{}, []transactions.SignedTxnInBlock{},
fmt.Errorf("EvalForIndexer() err: %w", err)
}
return eval.ProcessBlockForIndexer(block)
}
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