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postgres functions to check if node was removed (e.g. a la EIP158) in a range; update backend to use these to retrieve state and storage leafs in single (albeit complex) SELECT query

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This commit is contained in:
Ian Norden 2020-10-31 15:00:03 -05:00
parent 7c06d4b3a1
commit b128f894c4
3 changed files with 195 additions and 127 deletions
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37
db/migrations/00018_create_check_if_removed_functions.sql Normal file
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@ -0,0 +1,37 @@
-- +goose Up
-- +goose StatementBegin
-- returns if a storage node at the provided path was removed in the range > the provided height and <= the provided block hash
CREATE OR REPLACE FUNCTION was_storage_removed(path BYTEA, height BIGINT, hash VARCHAR(66)) RETURNS BOOLEAN
AS $$
SELECT exists(SELECT *
FROM eth.storage_cids
INNER JOIN eth.state_cids ON (storage_cids.state_id = state_cids.id)
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
WHERE storage_path = path
AND block_number > height
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = hash)
AND storage_cids.node_type = 3);
$$ LANGUAGE SQL;
-- +goose StatementEnd
-- +goose StatementBegin
-- returns if a state node at the provided path was removed in the range > the provided height and <= the provided block hash
CREATE OR REPLACE FUNCTION was_state_removed(path BYTEA, height BIGINT, hash VARCHAR(66)) RETURNS BOOLEAN
AS $$
SELECT exists(SELECT *
FROM eth.state_cids
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
WHERE state_path = path
AND block_number > height
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = hash)
AND state_cids.node_type = 3);
$$ LANGUAGE SQL;
-- +goose StatementEnd
-- +goose Down
DROP FUNCTION was_storage_removed;
DROP FUNCTION was_state_removed;

39
db/schema.sql
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@ -100,6 +100,45 @@ CREATE FUNCTION public.header_weight(hash character varying) RETURNS bigint
$$; $$;
--
-- Name: was_state_removed(bytea, bigint, character varying); Type: FUNCTION; Schema: public; Owner: -
--
CREATE FUNCTION public.was_state_removed(path bytea, height bigint, hash character varying) RETURNS boolean
LANGUAGE sql
AS $$
SELECT exists(SELECT *
FROM eth.state_cids
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
WHERE state_path = path
AND block_number > height
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = hash)
AND state_cids.node_type = 3);
$$;
--
-- Name: was_storage_removed(bytea, bigint, character varying); Type: FUNCTION; Schema: public; Owner: -
--
CREATE FUNCTION public.was_storage_removed(path bytea, height bigint, hash character varying) RETURNS boolean
LANGUAGE sql
AS $$
SELECT exists(SELECT *
FROM eth.storage_cids
INNER JOIN eth.state_cids ON (storage_cids.state_id = state_cids.id)
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
WHERE storage_path = path
AND block_number > height
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = hash)
AND storage_cids.node_type = 3);
$$;
SET default_tablespace = ''; SET default_tablespace = '';
SET default_table_access_method = heap; SET default_table_access_method = heap;

204
pkg/eth/ipld_retriever.go
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@ -19,8 +19,6 @@ package eth
import ( import (
"fmt" "fmt"
"github.com/vulcanize/ipld-eth-server/pkg/shared"
"github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rlp" "github.com/ethereum/go-ethereum/rlp"
@ -34,7 +32,8 @@ const (
FROM eth.header_cids FROM eth.header_cids
INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key)
WHERE block_hash = ANY($1::VARCHAR(66)[])` WHERE block_hash = ANY($1::VARCHAR(66)[])`
RetrieveHeadersByBlockNumberPgStr = `SELECT cid, data FROM eth.header_cids RetrieveHeadersByBlockNumberPgStr = `SELECT cid, data
FROM eth.header_cids
INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (header_cids.mh_key = blocks.key)
WHERE block_number = $1` WHERE block_number = $1`
RetrieveHeaderByHashPgStr = `SELECT cid, data RetrieveHeaderByHashPgStr = `SELECT cid, data
@ -45,15 +44,16 @@ const (
FROM eth.uncle_cids FROM eth.uncle_cids
INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key)
WHERE block_hash = ANY($1::VARCHAR(66)[])` WHERE block_hash = ANY($1::VARCHAR(66)[])`
RetrieveUnclesByBlockHashPgStr = `SELECT uncle_cids.cid, data FROM eth.uncle_cids, eth.header_cids, public.blocks RetrieveUnclesByBlockHashPgStr = `SELECT uncle_cids.cid, data
WHERE uncle_cids.header_id = header_cids.id FROM eth.uncle_cids
AND uncle_cids.mh_key = blocks.key INNER JOIN eth.header_cids ON (uncle_cids.header_id = header_cids.id)
AND block_hash = $1` INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key)
WHERE block_hash = $1`
RetrieveUnclesByBlockNumberPgStr = `SELECT uncle_cids.cid, data RetrieveUnclesByBlockNumberPgStr = `SELECT uncle_cids.cid, data
FROM eth.uncle_cids, eth.header_cids, public.blocks FROM eth.uncle_cids
WHERE uncle_cids.header_id = header_cids.id INNER JOIN eth.header_cids ON (uncle_cids.header_id = header_cids.id)
AND uncle_cids.mh_key = blocks.key INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key)
AND block_number = $1` WHERE block_number = $1`
RetrieveUncleByHashPgStr = `SELECT cid, data RetrieveUncleByHashPgStr = `SELECT cid, data
FROM eth.uncle_cids FROM eth.uncle_cids
INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (uncle_cids.mh_key = blocks.key)
@ -63,75 +63,90 @@ const (
INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key)
WHERE tx_hash = ANY($1::VARCHAR(66)[])` WHERE tx_hash = ANY($1::VARCHAR(66)[])`
RetrieveTransactionsByBlockHashPgStr = `SELECT transaction_cids.cid, data RetrieveTransactionsByBlockHashPgStr = `SELECT transaction_cids.cid, data
FROM eth.transaction_cids, eth.header_cids, public.blocks FROM eth.transaction_cids
WHERE transaction_cids.header_id = header_cids.id INNER JOIN eth.header_cids ON (transaction_cids.header_id = header_cids.id)
AND transaction_cids.mh_key = blocks.key INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key)
AND block_hash = $1` WHERE block_hash = $1`
RetrieveTransactionsByBlockNumberPgStr = `SELECT transaction_cids.cid, data RetrieveTransactionsByBlockNumberPgStr = `SELECT transaction_cids.cid, data
FROM eth.transaction_cids, eth.header_cids, public.blocks FROM eth.transaction_cids
WHERE transaction_cids.header_id = header_cids.id INNER JOIN eth.header_cids ON (transaction_cids.header_id = header_cids.id)
AND transaction_cids.mh_key = blocks.key INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key)
AND block_number = $1` WHERE block_number = $1`
RetrieveTransactionByHashPgStr = `SELECT cid, data FROM eth.transaction_cids RetrieveTransactionByHashPgStr = `SELECT cid, data
FROM eth.transaction_cids
INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key) INNER JOIN public.blocks ON (transaction_cids.mh_key = blocks.key)
WHERE tx_hash = $1` WHERE tx_hash = $1`
RetrieveReceiptsByTxHashesPgStr = `SELECT receipt_cids.cid, data RetrieveReceiptsByTxHashesPgStr = `SELECT receipt_cids.cid, data
FROM eth.receipt_cids, eth.transaction_cids, public.blocks FROM eth.receipt_cids
WHERE receipt_cids.mh_key = blocks.key INNER JOIN eth.transaction_cids ON (receipt_cids.tx_id = transaction_cids.id)
AND receipt_cids.tx_id = transaction_cids.id INNER JOIN public.blocks ON (receipt_cids.mh_key = blocks.key)
AND tx_hash = ANY($1::VARCHAR(66)[])` WHERE tx_hash = ANY($1::VARCHAR(66)[])`
RetrieveReceiptsByBlockHashPgStr = `SELECT receipt_cids.cid, data RetrieveReceiptsByBlockHashPgStr = `SELECT receipt_cids.cid, data
FROM eth.receipt_cids, eth.transaction_cids, eth.header_cids, public.blocks FROM eth.receipt_cids
WHERE receipt_cids.tx_id = transaction_cids.id INNER JOIN eth.transaction_cids ON (receipt_cids.tx_id = transaction_cids.id)
AND transaction_cids.header_id = header_cids.id INNER JOIN eth.header_cids ON (transaction_cids.header_id = header_cids.id)
AND receipt_cids.mh_key = blocks.key INNER JOIN public.blocks ON (receipt_cids.mh_key = blocks.key)
AND block_hash = $1` WHERE block_hash = $1`
RetrieveReceiptsByBlockNumberPgStr = `SELECT receipt_cids.cid, data RetrieveReceiptsByBlockNumberPgStr = `SELECT receipt_cids.cid, data
FROM eth.receipt_cids, eth.transaction_cids, eth.header_cids, public.blocks FROM eth.receipt_cids
WHERE receipt_cids.tx_id = transaction_cids.id INNER JOIN eth.transaction_cids ON (receipt_cids.tx_id = transaction_cids.id)
AND transaction_cids.header_id = header_cids.id INNER JOIN eth.header_cids ON (transaction_cids.header_id = header_cids.id)
AND receipt_cids.mh_key = blocks.key INNER JOIN public.blocks ON (receipt_cids.mh_key = blocks.key)
AND block_number = $1` WHERE block_number = $1`
RetrieveReceiptByTxHashPgStr = `SELECT receipt_cids.cid, data RetrieveReceiptByTxHashPgStr = `SELECT receipt_cids.cid, data
FROM eth.receipt_cids, eth.transaction_cids, eth.receipt_cids FROM eth.receipt_cids
WHERE receipt_cids.mh_key = blocks.key INNER JOIN eth.transaction_cids ON (receipt_cids.tx_id = transaction_cids.id)
AND receipt_cids.tx_id = transaction_cids.id INNER JOIN public.blocks ON (receipt_cids.mh_key = blocks.key)
AND tx_hash = $1` WHERE tx_hash = $1`
RetrieveAccountByLeafKeyAndBlockHashPgStr = `SELECT state_cids.cid, data RetrieveAccountByLeafKeyAndBlockHashPgStr = `SELECT state_cids.cid,
FROM eth.state_cids, eth.header_cids, public.blocks data,
WHERE state_cids.header_id = header_cids.id was_state_removed(state_path, block_number, $2) AS removed
AND state_cids.mh_key = blocks.key FROM eth.state_cids
AND state_leaf_key = $1 INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
INNER JOIN public.blocks ON (state_cids.mh_key = blocks.key)
WHERE state_leaf_key = $1
AND block_number <= (SELECT block_number AND block_number <= (SELECT block_number
FROM eth.header_cids FROM eth.header_cids
WHERE block_hash = $2) WHERE block_hash = $2)
AND header_cids.id = (SELECT canonical_header(block_number)) AND header_cids.id = (SELECT canonical_header(block_number))
ORDER BY block_number DESC ORDER BY block_number DESC
LIMIT 1` LIMIT 1`
RetrieveAccountByLeafKeyAndBlockNumberPgStr = `SELECT state_cids.cid, data RetrieveAccountByLeafKeyAndBlockNumberPgStr = `SELECT state_cids.cid,
FROM eth.state_cids, eth.header_cids, public.blocks data,
WHERE state_cids.header_id = header_cids.id was_state_removed(state_path, block_number, (SELECT block_hash
AND state_cids.mh_key = blocks.key FROM eth.header_cids
AND state_leaf_key = $1 WHERE block_number = $2
LIMIT 1)) AS removed
FROM eth.state_cids
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
INNER JOIN public.blocks ON (state_cids.mh_key = blocks.key)
WHERE state_leaf_key = $1
AND block_number <= $2 AND block_number <= $2
ORDER BY block_number DESC ORDER BY block_number DESC
LIMIT 1` LIMIT 1`
RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockNumberPgStr = `SELECT storage_cids.cid, data RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockNumberPgStr = `SELECT storage_cids.cid,
FROM eth.storage_cids, eth.state_cids, eth.header_cids, public.blocks data,
WHERE storage_cids.state_id = state_cids.id was_storage_removed(storage_path, block_number, (SELECT block_hash
AND state_cids.header_id = header_cids.id FROM eth.header_cids
AND storage_cids.mh_key = blocks.key WHERE block_number = $3
AND state_leaf_key = $1 LIMIT 1)) AS removed
FROM eth.storage_cids
INNER JOIN eth.state_cids ON (storage_cids.state_id = state_cids.id)
INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
INNER JOIN public.blocks ON (storage_cids.mh_key = blocks.key)
WHERE state_leaf_key = $1
AND storage_leaf_key = $2 AND storage_leaf_key = $2
AND block_number <= $3 AND block_number <= $3
ORDER BY block_number DESC ORDER BY block_number DESC
LIMIT 1` LIMIT 1`
retrieveStorageInfoPgStr = `SELECT storage_cids.cid, data, storage_path, block_number RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockHashPgStr = `SELECT storage_cids.cid,
FROM eth.storage_cids, eth.state_cids, eth.header_cids, public.blocks data,
WHERE storage_cids.state_id = state_cids.id was_storage_removed(storage_path, block_number, $3) AS removed
AND state_cids.header_id = header_cids.id FROM eth.storage_cids
AND storage_cids.mh_key = blocks.key INNER JOIN eth.state_cids ON (storage_cids.state_id = state_cids.id)
AND state_leaf_key = $1 INNER JOIN eth.header_cids ON (state_cids.header_id = header_cids.id)
INNER JOIN public.blocks ON (storage_cids.mh_key = blocks.key)
WHERE state_leaf_key = $1
AND storage_leaf_key = $2 AND storage_leaf_key = $2
AND block_number <= (SELECT block_number AND block_number <= (SELECT block_number
FROM eth.header_cids FROM eth.header_cids
@ -139,15 +154,6 @@ const (
AND header_cids.id = (SELECT canonical_header(block_number)) AND header_cids.id = (SELECT canonical_header(block_number))
ORDER BY block_number DESC ORDER BY block_number DESC
LIMIT 1` LIMIT 1`
wasNodeDeletedpgStr = `SELECT exists(SELECT *
FROM eth.storage_cids, eth.state_cids, eth.header_cids
WHERE storage_cids.state_id = state_cids.id
AND storage_path = $1
AND block_number > $2
AND block_number <= (SELECT block_number
FROM eth.header_cids
WHERE block_hash = $3)
AND storage_cids.node_type = 3)`
) )
type ipldResult struct { type ipldResult struct {
@ -370,14 +376,23 @@ func (r *IPLDRetriever) RetrieveReceiptByHash(hash common.Hash) (string, []byte,
return rctResult.CID, rctResult.Data, r.db.Get(rctResult, RetrieveReceiptByTxHashPgStr, hash.Hex()) return rctResult.CID, rctResult.Data, r.db.Get(rctResult, RetrieveReceiptByTxHashPgStr, hash.Hex())
} }
type nodeInfo struct {
CID string `db:"cid"`
Data []byte `db:"data"`
Removed bool `db:"removed"`
}
// RetrieveAccountByAddressAndBlockHash returns the cid and rlp bytes for the account corresponding to the provided address and block hash // RetrieveAccountByAddressAndBlockHash returns the cid and rlp bytes for the account corresponding to the provided address and block hash
// TODO: ensure this handles deleted accounts appropriately // TODO: ensure this handles deleted accounts appropriately
func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockHash(address common.Address, hash common.Hash) (string, []byte, error) { func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockHash(address common.Address, hash common.Hash) (string, []byte, error) {
accountResult := new(ipldResult) accountResult := new(nodeInfo)
leafKey := crypto.Keccak256Hash(address.Bytes()) leafKey := crypto.Keccak256Hash(address.Bytes())
if err := r.db.Get(accountResult, RetrieveAccountByLeafKeyAndBlockHashPgStr, leafKey.Hex(), hash.Hex()); err != nil { if err := r.db.Get(accountResult, RetrieveAccountByLeafKeyAndBlockHashPgStr, leafKey.Hex(), hash.Hex()); err != nil {
return "", nil, err return "", nil, err
} }
if accountResult.Removed {
return "", []byte{}, nil
}
var i []interface{} var i []interface{}
if err := rlp.DecodeBytes(accountResult.Data, &i); err != nil { if err := rlp.DecodeBytes(accountResult.Data, &i); err != nil {
return "", nil, fmt.Errorf("error decoding state leaf node rlp: %s", err.Error()) return "", nil, fmt.Errorf("error decoding state leaf node rlp: %s", err.Error())
@ -391,11 +406,14 @@ func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockHash(address common.Addr
// RetrieveAccountByAddressAndBlockNumber returns the cid and rlp bytes for the account corresponding to the provided address and block number // RetrieveAccountByAddressAndBlockNumber returns the cid and rlp bytes for the account corresponding to the provided address and block number
// This can return a non-canonical account // This can return a non-canonical account
func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockNumber(address common.Address, number uint64) (string, []byte, error) { func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockNumber(address common.Address, number uint64) (string, []byte, error) {
accountResult := new(ipldResult) accountResult := new(nodeInfo)
leafKey := crypto.Keccak256Hash(address.Bytes()) leafKey := crypto.Keccak256Hash(address.Bytes())
if err := r.db.Get(accountResult, RetrieveAccountByLeafKeyAndBlockNumberPgStr, leafKey.Hex(), number); err != nil { if err := r.db.Get(accountResult, RetrieveAccountByLeafKeyAndBlockNumberPgStr, leafKey.Hex(), number); err != nil {
return "", nil, err return "", nil, err
} }
if accountResult.Removed {
return "", []byte{}, nil
}
var i []interface{} var i []interface{}
if err := rlp.DecodeBytes(accountResult.Data, &i); err != nil { if err := rlp.DecodeBytes(accountResult.Data, &i); err != nil {
return "", nil, fmt.Errorf("error decoding state leaf node rlp: %s", err.Error()) return "", nil, fmt.Errorf("error decoding state leaf node rlp: %s", err.Error())
@ -406,42 +424,14 @@ func (r *IPLDRetriever) RetrieveAccountByAddressAndBlockNumber(address common.Ad
return accountResult.CID, i[1].([]byte), nil return accountResult.CID, i[1].([]byte), nil
} }
type storageInfo struct {
CID string `db:"cid"`
Data []byte `db:"data"`
Path []byte `db:"storage_path"`
BlockNumber uint64 `db:"block_number"`
}
// RetrieveStorageAtByAddressAndStorageKeyAndBlockHash returns the cid and rlp bytes for the storage value corresponding to the provided address, storage key, and block hash // RetrieveStorageAtByAddressAndStorageKeyAndBlockHash returns the cid and rlp bytes for the storage value corresponding to the provided address, storage key, and block hash
func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageKeyAndBlockHash(address common.Address, storageLeafKey, hash common.Hash) (string, []byte, error) { func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageKeyAndBlockHash(address common.Address, storageLeafKey, hash common.Hash) (string, []byte, error) {
// Begin tx storageResult := new(nodeInfo)
tx, err := r.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()
}
}()
storageResult := new(storageInfo)
stateLeafKey := crypto.Keccak256Hash(address.Bytes()) stateLeafKey := crypto.Keccak256Hash(address.Bytes())
if err := tx.Get(storageResult, retrieveStorageInfoPgStr, stateLeafKey.Hex(), storageLeafKey.Hex(), hash.Hex()); err != nil { if err := r.db.Get(storageResult, RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockHashPgStr, stateLeafKey.Hex(), storageLeafKey.Hex(), hash.Hex()); err != nil {
return "", nil, err return "", nil, err
} }
if storageResult.Removed {
deleted := false
if err := tx.Get(&deleted, wasNodeDeletedpgStr, storageResult.Path, storageResult.BlockNumber, hash.Hex()); err != nil {
return "", nil, err
}
if deleted {
return "", []byte{}, nil return "", []byte{}, nil
} }
var i []interface{} var i []interface{}
@ -450,20 +440,22 @@ func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageKeyAndBlockHash(addr
return "", nil, err return "", nil, err
} }
if len(i) != 2 { if len(i) != 2 {
err = fmt.Errorf("eth IPLDRetriever expected storage leaf node rlp to decode into two elements") return "", nil, fmt.Errorf("eth IPLDRetriever expected storage leaf node rlp to decode into two elements")
return "", nil, err
} }
return storageResult.CID, i[1].([]byte), err return storageResult.CID, i[1].([]byte), nil
} }
// RetrieveStorageAtByAddressAndStorageKeyAndBlockNumber returns the cid and rlp bytes for the storage value corresponding to the provided address, storage key, and block number // RetrieveStorageAtByAddressAndStorageKeyAndBlockNumber returns the cid and rlp bytes for the storage value corresponding to the provided address, storage key, and block number
// This can retrun a non-canonical value // This can retrun a non-canonical value
func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageKeyAndBlockNumber(address common.Address, storageLeafKey common.Hash, number uint64) (string, []byte, error) { func (r *IPLDRetriever) RetrieveStorageAtByAddressAndStorageKeyAndBlockNumber(address common.Address, storageLeafKey common.Hash, number uint64) (string, []byte, error) {
storageResult := new(ipldResult) storageResult := new(nodeInfo)
stateLeafKey := crypto.Keccak256Hash(address.Bytes()) stateLeafKey := crypto.Keccak256Hash(address.Bytes())
if err := r.db.Get(storageResult, RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockNumberPgStr, stateLeafKey.Hex(), storageLeafKey.Hex(), number); err != nil { if err := r.db.Get(storageResult, RetrieveStorageLeafByAddressHashAndLeafKeyAndBlockNumberPgStr, stateLeafKey.Hex(), storageLeafKey.Hex(), number); err != nil {
return "", nil, err return "", nil, err
} }
if storageResult.Removed {
return "", []byte{}, nil
}
var i []interface{} var i []interface{}
if err := rlp.DecodeBytes(storageResult.Data, &i); err != nil { if err := rlp.DecodeBytes(storageResult.Data, &i); err != nil {
return "", nil, fmt.Errorf("error decoding storage leaf node rlp: %s", err.Error()) return "", nil, fmt.Errorf("error decoding storage leaf node rlp: %s", err.Error())