ipld-eth-server/pkg/eth/backend.go

821 lines
26 KiB
Go

// VulcanizeDB
// Copyright © 2019 Vulcanize
// This program 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.
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
package eth
import (
"context"
"database/sql"
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/bloombits"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/trie"
ipfsethdb "github.com/vulcanize/ipfs-ethdb"
"github.com/vulcanize/ipld-eth-indexer/pkg/ipfs"
"github.com/vulcanize/ipld-eth-indexer/pkg/postgres"
shared2 "github.com/vulcanize/ipld-eth-indexer/pkg/shared"
"github.com/vulcanize/ipld-eth-server/pkg/shared"
)
var (
errPendingBlockNumber = errors.New("pending block number not supported")
errNegativeBlockNumber = errors.New("negative block number not supported")
errHeaderHashNotFound = errors.New("header for hash not found")
errHeaderNotFound = errors.New("header not found")
)
const (
RetrieveCanonicalBlockHashByNumber = `SELECT block_hash FROM eth.header_cids
INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key)
WHERE id = (SELECT canonical_header_id($1))`
RetrieveCanonicalHeaderByNumber = `SELECT cid, data FROM eth.header_cids
INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key)
WHERE id = (SELECT canonical_header_id($1))`
RetrieveTD = `SELECT td FROM eth.header_cids
WHERE header_cids.block_hash = $1`
RetrieveRPCTransaction = `SELECT blocks.data, block_hash, block_number, index FROM public.blocks, eth.transaction_cids, eth.header_cids
WHERE blocks.key = transaction_cids.mh_key
AND transaction_cids.header_id = header_cids.id
AND transaction_cids.tx_hash = $1`
RetrieveCodeHashByLeafKeyAndBlockHash = `SELECT code_hash FROM eth.state_accounts, eth.state_cids, eth.header_cids
WHERE state_accounts.state_id = state_cids.id
AND state_cids.header_id = header_cids.id
AND state_leaf_key = $1
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = $2)
AND header_cids.id = (SELECT canonical_header_id(block_number))
ORDER BY block_number DESC
LIMIT 1`
RetrieveCodeByMhKey = `SELECT data FROM public.blocks WHERE key = $1`
)
type Backend struct {
// underlying postgres db
DB *postgres.DB
// postgres db interfaces
Retriever *CIDRetriever
Fetcher *IPLDFetcher
IPLDRetriever *IPLDRetriever
// ethereum interfaces
EthDB ethdb.Database
StateDatabase state.Database
Config *Config
}
type Config struct {
ChainConfig *params.ChainConfig
VmConfig vm.Config
DefaultSender *common.Address
RPCGasCap *big.Int
}
func NewEthBackend(db *postgres.DB, c *Config) (*Backend, error) {
r := NewCIDRetriever(db)
ethDB := ipfsethdb.NewDatabase(db.DB)
return &Backend{
DB: db,
Retriever: r,
Fetcher: NewIPLDFetcher(db),
IPLDRetriever: NewIPLDRetriever(db),
EthDB: ethDB,
StateDatabase: state.NewDatabase(ethDB),
Config: c,
}, nil
}
// ChainDb returns the backend's underlying chain database
func (b *Backend) ChainDb() ethdb.Database {
return b.EthDB
}
// HeaderByNumber gets the canonical header for the provided block number
func (b *Backend) HeaderByNumber(ctx context.Context, blockNumber rpc.BlockNumber) (*types.Header, error) {
var err error
number := blockNumber.Int64()
if blockNumber == rpc.LatestBlockNumber {
number, err = b.Retriever.RetrieveLastBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.EarliestBlockNumber {
number, err = b.Retriever.RetrieveFirstBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.PendingBlockNumber {
return nil, errPendingBlockNumber
}
if number < 0 {
return nil, errNegativeBlockNumber
}
_, canonicalHeaderRLP, err := b.GetCanonicalHeader(uint64(number))
if err != nil {
return nil, err
}
header := new(types.Header)
return header, rlp.DecodeBytes(canonicalHeaderRLP, header)
}
// HeaderByHash gets the header for the provided block hash
func (b *Backend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
_, headerRLP, err := b.IPLDRetriever.RetrieveHeaderByHash(hash)
if err != nil {
return nil, err
}
header := new(types.Header)
return header, rlp.DecodeBytes(headerRLP, header)
}
// HeaderByNumberOrHash gets the header for the provided block hash or number
func (b *Backend) HeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Header, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.HeaderByNumber(ctx, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
header, err := b.HeaderByHash(ctx, hash)
if err != nil {
return nil, err
}
if header == nil {
return nil, errors.New("header for hash not found")
}
canonicalHash, err := b.GetCanonicalHash(header.Number.Uint64())
if err != nil {
return nil, err
}
if blockNrOrHash.RequireCanonical && canonicalHash != hash {
return nil, errors.New("hash is not currently canonical")
}
return header, nil
}
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
// GetTd gets the total difficulty at the given block hash
func (b *Backend) GetTd(blockHash common.Hash) (*big.Int, error) {
var tdStr string
err := b.DB.Get(&tdStr, RetrieveTD, blockHash.String())
if err != nil {
return nil, err
}
td, ok := new(big.Int).SetString(tdStr, 10)
if !ok {
return nil, errors.New("total difficulty retrieved from Postgres cannot be converted to an integer")
}
return td, nil
}
// CurrentBlock returns the current block
func (b *Backend) CurrentBlock() (*types.Block, error) {
block, err := b.BlockByNumber(context.Background(), rpc.LatestBlockNumber)
return block, err
}
// BlockByNumberOrHash returns block by number or hash
func (b *Backend) BlockByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Block, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.BlockByNumber(ctx, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
header, err := b.HeaderByHash(ctx, hash)
if err != nil {
return nil, err
}
if header == nil {
return nil, errors.New("header for hash not found")
}
canonicalHash, err := b.GetCanonicalHash(header.Number.Uint64())
if err != nil {
return nil, err
}
if blockNrOrHash.RequireCanonical && canonicalHash != hash {
return nil, errors.New("hash is not currently canonical")
}
block, err := b.BlockByHash(ctx, hash)
if err != nil {
return nil, err
}
if block == nil {
return nil, errors.New("header found, but block body is missing")
}
return block, nil
}
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
// BlockByNumber returns the requested canonical block.
func (b *Backend) BlockByNumber(ctx context.Context, blockNumber rpc.BlockNumber) (*types.Block, error) {
var err error
number := blockNumber.Int64()
if blockNumber == rpc.LatestBlockNumber {
number, err = b.Retriever.RetrieveLastBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.EarliestBlockNumber {
number, err = b.Retriever.RetrieveFirstBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.PendingBlockNumber {
return nil, errPendingBlockNumber
}
if number < 0 {
return nil, errNegativeBlockNumber
}
// Get the canonical hash
canonicalHash, err := b.GetCanonicalHash(uint64(number))
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
// Retrieve all the CIDs for the block
// TODO: optimize this by retrieving iplds directly rather than the cids first (this is remanent from when we fetched iplds through ipfs blockservice interface)
headerCID, uncleCIDs, txCIDs, rctCIDs, err := b.Retriever.RetrieveBlockByHash(canonicalHash)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
// Begin tx
tx, err := b.DB.Beginx()
if err != nil {
return nil, err
}
defer func() {
if p := recover(); p != nil {
shared.Rollback(tx)
panic(p)
} else if err != nil {
shared.Rollback(tx)
} else {
err = tx.Commit()
}
}()
// Fetch and decode the header IPLD
var headerIPLD ipfs.BlockModel
headerIPLD, err = b.Fetcher.FetchHeader(tx, headerCID)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var header types.Header
err = rlp.DecodeBytes(headerIPLD.Data, &header)
if err != nil {
return nil, err
}
// Fetch and decode the uncle IPLDs
var uncleIPLDs []ipfs.BlockModel
uncleIPLDs, err = b.Fetcher.FetchUncles(tx, uncleCIDs)
if err != nil {
return nil, err
}
var uncles []*types.Header
for _, uncleIPLD := range uncleIPLDs {
var uncle types.Header
err = rlp.DecodeBytes(uncleIPLD.Data, &uncle)
if err != nil {
return nil, err
}
uncles = append(uncles, &uncle)
}
// Fetch and decode the transaction IPLDs
var txIPLDs []ipfs.BlockModel
txIPLDs, err = b.Fetcher.FetchTrxs(tx, txCIDs)
if err != nil {
return nil, err
}
var transactions []*types.Transaction
for _, txIPLD := range txIPLDs {
var transaction types.Transaction
err = transaction.UnmarshalBinary(txIPLD.Data)
if err != nil {
return nil, err
}
transactions = append(transactions, &transaction)
}
// Fetch and decode the receipt IPLDs
var rctIPLDs []ipfs.BlockModel
rctIPLDs, err = b.Fetcher.FetchRcts(tx, rctCIDs)
if err != nil {
return nil, err
}
var receipts []*types.Receipt
for _, rctIPLD := range rctIPLDs {
var receipt types.Receipt
err = receipt.UnmarshalBinary(rctIPLD.Data)
if err != nil {
return nil, err
}
receipts = append(receipts, &receipt)
}
// Compose everything together into a complete block
return types.NewBlock(&header, transactions, uncles, receipts, new(trie.Trie)), err
}
// BlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
// detail, otherwise only the transaction hash is returned.
func (b *Backend) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
// Retrieve all the CIDs for the block
headerCID, uncleCIDs, txCIDs, rctCIDs, err := b.Retriever.RetrieveBlockByHash(hash)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
// Begin tx
tx, err := b.DB.Beginx()
if err != nil {
return nil, err
}
defer func() {
if p := recover(); p != nil {
shared.Rollback(tx)
panic(p)
} else if err != nil {
shared.Rollback(tx)
} else {
err = tx.Commit()
}
}()
// Fetch and decode the header IPLD
var headerIPLD ipfs.BlockModel
headerIPLD, err = b.Fetcher.FetchHeader(tx, headerCID)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var header types.Header
err = rlp.DecodeBytes(headerIPLD.Data, &header)
if err != nil {
return nil, err
}
// Fetch and decode the uncle IPLDs
var uncleIPLDs []ipfs.BlockModel
uncleIPLDs, err = b.Fetcher.FetchUncles(tx, uncleCIDs)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var uncles []*types.Header
for _, uncleIPLD := range uncleIPLDs {
var uncle types.Header
err = rlp.DecodeBytes(uncleIPLD.Data, &uncle)
if err != nil {
return nil, err
}
uncles = append(uncles, &uncle)
}
// Fetch and decode the transaction IPLDs
var txIPLDs []ipfs.BlockModel
txIPLDs, err = b.Fetcher.FetchTrxs(tx, txCIDs)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var transactions []*types.Transaction
for _, txIPLD := range txIPLDs {
var transaction types.Transaction
err = transaction.UnmarshalBinary(txIPLD.Data)
if err != nil {
return nil, err
}
transactions = append(transactions, &transaction)
}
// Fetch and decode the receipt IPLDs
var rctIPLDs []ipfs.BlockModel
rctIPLDs, err = b.Fetcher.FetchRcts(tx, rctCIDs)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
var receipts []*types.Receipt
for _, rctIPLD := range rctIPLDs {
var receipt types.Receipt
err = receipt.UnmarshalBinary(rctIPLD.Data)
if err != nil {
return nil, err
}
receipts = append(receipts, &receipt)
}
// Compose everything together into a complete block
return types.NewBlock(&header, transactions, uncles, receipts, new(trie.Trie)), err
}
// GetTransaction retrieves a tx by hash
// It also returns the blockhash, blocknumber, and tx index associated with the transaction
func (b *Backend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
var tempTxStruct struct {
Data []byte `db:"data"`
BlockHash string `db:"block_hash"`
BlockNumber uint64 `db:"block_number"`
Index uint64 `db:"index"`
}
if err := b.DB.Get(&tempTxStruct, RetrieveRPCTransaction, txHash.String()); err != nil {
return nil, common.Hash{}, 0, 0, err
}
var transaction types.Transaction
if err := transaction.UnmarshalBinary(tempTxStruct.Data); err != nil {
return nil, common.Hash{}, 0, 0, err
}
return &transaction, common.HexToHash(tempTxStruct.BlockHash), tempTxStruct.BlockNumber, tempTxStruct.Index, nil
}
// GetReceipts retrieves receipts for provided block hash
func (b *Backend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
_, receiptBytes, err := b.IPLDRetriever.RetrieveReceiptsByBlockHash(hash)
if err != nil {
return nil, err
}
rcts := make(types.Receipts, len(receiptBytes))
for i, rctBytes := range receiptBytes {
rct := new(types.Receipt)
if err := rct.UnmarshalBinary(rctBytes); err != nil {
return nil, err
}
rcts[i] = rct
}
return rcts, nil
}
// GetLogs returns all the logs for the given block hash
func (b *Backend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error) {
_, receiptBytes, err := b.IPLDRetriever.RetrieveReceiptsByBlockHash(hash)
if err != nil {
return nil, err
}
logs := make([][]*types.Log, len(receiptBytes))
for i, rctBytes := range receiptBytes {
var rct types.Receipt
if err := rlp.DecodeBytes(rctBytes, &rct); err != nil {
return nil, err
}
logs[i] = rct.Logs
}
return logs, nil
}
// StateAndHeaderByNumberOrHash returns the statedb and header for the provided block number or hash
func (b *Backend) StateAndHeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*state.StateDB, *types.Header, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.StateAndHeaderByNumber(ctx, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
header, err := b.HeaderByHash(ctx, hash)
if err != nil {
return nil, nil, err
}
if header == nil {
return nil, nil, errors.New("header for hash not found")
}
canonicalHash, err := b.GetCanonicalHash(header.Number.Uint64())
if err != nil {
return nil, nil, err
}
if blockNrOrHash.RequireCanonical && canonicalHash != hash {
return nil, nil, errors.New("hash is not currently canonical")
}
stateDb, err := state.New(header.Root, b.StateDatabase, nil)
return stateDb, header, err
}
return nil, nil, errors.New("invalid arguments; neither block nor hash specified")
}
// StateAndHeaderByNumber returns the statedb and header for a provided block number
func (b *Backend) StateAndHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
// Pending state is only known by the miner
if number == rpc.PendingBlockNumber {
return nil, nil, errPendingBlockNumber
}
// Otherwise resolve the block number and return its state
header, err := b.HeaderByNumber(ctx, number)
if err != nil {
return nil, nil, err
}
if header == nil {
return nil, nil, errors.New("header not found")
}
stateDb, err := state.New(header.Root, b.StateDatabase, nil)
return stateDb, header, err
}
// GetCanonicalHash gets the canonical hash for the provided number, if there is one
func (b *Backend) GetCanonicalHash(number uint64) (common.Hash, error) {
var hashResult string
if err := b.DB.Get(&hashResult, RetrieveCanonicalBlockHashByNumber, number); err != nil {
return common.Hash{}, err
}
return common.HexToHash(hashResult), nil
}
type rowResult struct {
CID string
Data []byte
}
// GetCanonicalHeader gets the canonical header for the provided number, if there is one
func (b *Backend) GetCanonicalHeader(number uint64) (string, []byte, error) {
headerResult := new(rowResult)
return headerResult.CID, headerResult.Data, b.DB.QueryRowx(RetrieveCanonicalHeaderByNumber, number).StructScan(headerResult)
}
// GetEVM constructs and returns a vm.EVM
func (b *Backend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header) (*vm.EVM, error) {
state.SetBalance(msg.From(), math.MaxBig256)
vmctx := core.NewEVMBlockContext(header, b, nil)
txContext := core.NewEVMTxContext(msg)
return vm.NewEVM(vmctx, txContext, state, b.Config.ChainConfig, b.Config.VmConfig), nil
}
// GetAccountByNumberOrHash returns the account object for the provided address at the block corresponding to the provided number or hash
func (b *Backend) GetAccountByNumberOrHash(ctx context.Context, address common.Address, blockNrOrHash rpc.BlockNumberOrHash) (*state.Account, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.GetAccountByNumber(ctx, address, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
return b.GetAccountByHash(ctx, address, hash)
}
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
// GetAccountByNumber returns the account object for the provided address at the canonical block at the provided height
func (b *Backend) GetAccountByNumber(ctx context.Context, address common.Address, blockNumber rpc.BlockNumber) (*state.Account, error) {
var err error
number := blockNumber.Int64()
if blockNumber == rpc.LatestBlockNumber {
number, err = b.Retriever.RetrieveLastBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.EarliestBlockNumber {
number, err = b.Retriever.RetrieveFirstBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.PendingBlockNumber {
return nil, errPendingBlockNumber
}
hash, err := b.GetCanonicalHash(uint64(number))
if err == sql.ErrNoRows {
return nil, errHeaderNotFound
} else if err != nil {
return nil, err
}
return b.GetAccountByHash(ctx, address, hash)
}
// GetAccountByHash returns the account object for the provided address at the block with the provided hash
func (b *Backend) GetAccountByHash(ctx context.Context, address common.Address, hash common.Hash) (*state.Account, error) {
_, err := b.HeaderByHash(context.Background(), hash)
if err == sql.ErrNoRows {
return nil, errHeaderHashNotFound
} else if err != nil {
return nil, err
}
_, accountRlp, err := b.IPLDRetriever.RetrieveAccountByAddressAndBlockHash(address, hash)
if err != nil {
return nil, err
}
acct := new(state.Account)
return acct, rlp.DecodeBytes(accountRlp, acct)
}
// GetCodeByNumberOrHash returns the byte code for the contract deployed at the provided address at the block with the provided hash or block number
func (b *Backend) GetCodeByNumberOrHash(ctx context.Context, address common.Address, blockNrOrHash rpc.BlockNumberOrHash) ([]byte, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.GetCodeByNumber(ctx, address, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
return b.GetCodeByHash(ctx, address, hash)
}
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
// GetCodeByNumber returns the byte code for the contract deployed at the provided address at the canonical block with the provided block number
func (b *Backend) GetCodeByNumber(ctx context.Context, address common.Address, blockNumber rpc.BlockNumber) ([]byte, error) {
var err error
number := blockNumber.Int64()
if blockNumber == rpc.LatestBlockNumber {
number, err = b.Retriever.RetrieveLastBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.EarliestBlockNumber {
number, err = b.Retriever.RetrieveFirstBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.PendingBlockNumber {
return nil, errPendingBlockNumber
}
hash, err := b.GetCanonicalHash(uint64(number))
if err != nil {
return nil, err
}
if hash == (common.Hash{}) {
return nil, fmt.Errorf("no canoncial block hash found for provided height (%d)", number)
}
return b.GetCodeByHash(ctx, address, hash)
}
// GetCodeByHash returns the byte code for the contract deployed at the provided address at the block with the provided hash
func (b *Backend) GetCodeByHash(ctx context.Context, address common.Address, hash common.Hash) ([]byte, error) {
codeHash := make([]byte, 0)
leafKey := crypto.Keccak256Hash(address.Bytes())
// Begin tx
tx, err := b.DB.Beginx()
if err != nil {
return nil, err
}
defer func() {
if p := recover(); p != nil {
shared.Rollback(tx)
panic(p)
} else if err != nil {
shared.Rollback(tx)
} else {
err = tx.Commit()
}
}()
err = tx.Get(&codeHash, RetrieveCodeHashByLeafKeyAndBlockHash, leafKey.Hex(), hash.Hex())
if err != nil {
return nil, err
}
var mhKey string
mhKey, err = shared2.MultihashKeyFromKeccak256(common.BytesToHash(codeHash))
if err != nil {
return nil, err
}
code := make([]byte, 0)
err = tx.Get(&code, RetrieveCodeByMhKey, mhKey)
return code, err
}
// GetStorageByNumberOrHash returns the storage value for the provided contract address an storage key at the block corresponding to the provided number or hash
func (b *Backend) GetStorageByNumberOrHash(ctx context.Context, address common.Address, key common.Hash, blockNrOrHash rpc.BlockNumberOrHash) (hexutil.Bytes, error) {
if blockNr, ok := blockNrOrHash.Number(); ok {
return b.GetStorageByNumber(ctx, address, key, blockNr)
}
if hash, ok := blockNrOrHash.Hash(); ok {
return b.GetStorageByHash(ctx, address, key, hash)
}
return nil, errors.New("invalid arguments; neither block nor hash specified")
}
// GetStorageByNumber returns the storage value for the provided contract address an storage key at the block corresponding to the provided number
func (b *Backend) GetStorageByNumber(ctx context.Context, address common.Address, key common.Hash, blockNumber rpc.BlockNumber) (hexutil.Bytes, error) {
var err error
number := blockNumber.Int64()
if blockNumber == rpc.LatestBlockNumber {
number, err = b.Retriever.RetrieveLastBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.EarliestBlockNumber {
number, err = b.Retriever.RetrieveFirstBlockNumber()
if err != nil {
return nil, err
}
}
if blockNumber == rpc.PendingBlockNumber {
return nil, errPendingBlockNumber
}
hash, err := b.GetCanonicalHash(uint64(number))
if err == sql.ErrNoRows {
return nil, errHeaderNotFound
} else if err != nil {
return nil, err
}
return b.GetStorageByHash(ctx, address, key, hash)
}
// GetStorageByHash returns the storage value for the provided contract address an storage key at the block corresponding to the provided hash
func (b *Backend) GetStorageByHash(ctx context.Context, address common.Address, key, hash common.Hash) (hexutil.Bytes, error) {
_, err := b.HeaderByHash(context.Background(), hash)
if err == sql.ErrNoRows {
return nil, errHeaderHashNotFound
} else if err != nil {
return nil, err
}
_, _, storageRlp, err := b.IPLDRetriever.RetrieveStorageAtByAddressAndStorageSlotAndBlockHash(address, key, hash)
return storageRlp, err
}
// Engine satisfied the ChainContext interface
func (b *Backend) Engine() consensus.Engine {
// TODO: we need to support more than just ethash based engines
return ethash.NewFaker()
}
// GetHeader satisfied the ChainContext interface
func (b *Backend) GetHeader(hash common.Hash, height uint64) *types.Header {
header, err := b.HeaderByHash(context.Background(), hash)
if err != nil {
return nil
}
return header
}
// RPCGasCap returns the configured gas cap for the rpc server
func (b *Backend) RPCGasCap() *big.Int {
return b.Config.RPCGasCap
}
func (b *Backend) SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription {
panic("implement me")
}
func (b *Backend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
panic("implement me")
}
func (b *Backend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
panic("implement me")
}
func (b *Backend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
panic("implement me")
}
func (b *Backend) SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription {
panic("implement me")
}
func (b *Backend) BloomStatus() (uint64, uint64) {
panic("implement me")
}
func (b *Backend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession) {
panic("implement me")
}