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querier.go
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querier.go
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package watcher
import (
"encoding/hex"
"encoding/json"
"errors"
"strconv"
ethtypes "github.com/ethereum/go-ethereum/core/types"
rpctypes "github.com/okex/okexchain/app/rpc/types"
"github.com/ethereum/go-ethereum/common"
)
const MsgFunctionDisable = "fast query function disabled"
type Querier struct {
store *WatchStore
sw bool
}
func (q Querier) enabled() bool {
return q.sw
}
func (q *Querier) Enable(sw bool) {
q.sw = sw
}
func NewQuerier() *Querier {
return &Querier{store: InstanceOfWatchStore(), sw: IsWatcherEnabled()}
}
func (q Querier) GetTransactionReceipt(hash common.Hash) (*TransactionReceipt, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
var receipt TransactionReceipt
b, e := q.store.Get([]byte(prefixReceipt + hash.String()))
if e != nil {
return nil, e
}
e = json.Unmarshal(b, &receipt)
if e != nil {
return nil, e
}
if receipt.Logs == nil {
receipt.Logs = []*ethtypes.Log{}
}
return &receipt, nil
}
func (q Querier) GetBlockByHash(hash common.Hash, fullTx bool) (*EthBlock, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
var block EthBlock
b, e := q.store.Get([]byte(prefixBlock + hash.String()))
if e != nil {
return nil, e
}
e = json.Unmarshal(b, &block)
if e != nil {
return nil, e
}
if fullTx && block.Transactions != nil {
txsHash := block.Transactions.([]interface{})
txList := []rpctypes.Transaction{}
for _, tx := range txsHash {
transaction, e := q.GetTransactionByHash(common.HexToHash(tx.(string)))
if e == nil && transaction != nil {
txList = append(txList, *transaction)
}
}
block.Transactions = txList
}
return &block, nil
}
func (q Querier) GetBlockByNumber(number uint64, fullTx bool) (*EthBlock, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
var height = number
var err error
if height == 0 {
height, err = q.GetLatestBlockNumber()
if err != nil {
return nil, err
}
}
hash, e := q.store.Get([]byte(prefixBlockInfo + strconv.Itoa(int(height))))
if e != nil {
return nil, e
}
return q.GetBlockByHash(common.HexToHash(string(hash)), fullTx)
}
func (q Querier) GetCode(contractAddr common.Address, height uint64) ([]byte, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
var codeInfo CodeInfo
info, e := q.store.Get([]byte(prefixCode + contractAddr.String()))
if e != nil {
return nil, e
}
e = json.Unmarshal(info, &codeInfo)
if e != nil {
return nil, e
}
if height < codeInfo.Height && height > 0 {
return nil, errors.New("the target height has not deploy this contract yet")
}
return hex.DecodeString(codeInfo.Code)
}
func (q Querier) GetLatestBlockNumber() (uint64, error) {
if !q.enabled() {
return 0, errors.New(MsgFunctionDisable)
}
height, e := q.store.Get([]byte(prefixLatestHeight + KeyLatestHeight))
if e != nil {
return 0, e
}
h, e := strconv.Atoi(string(height))
return uint64(h), e
}
func (q Querier) GetTransactionByHash(hash common.Hash) (*rpctypes.Transaction, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
var tx rpctypes.Transaction
transaction, e := q.store.Get([]byte(prefixTx + hash.String()))
if e != nil {
return nil, e
}
e = json.Unmarshal(transaction, &tx)
if e != nil {
return nil, e
}
return &tx, nil
}
func (q Querier) GetTransactionByBlockNumberAndIndex(number uint64, idx uint) (*rpctypes.Transaction, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
block, e := q.GetBlockByNumber(number, true)
if e != nil {
return nil, e
}
return q.getTransactionByBlockAndIndex(block, idx)
}
func (q Querier) GetTransactionByBlockHashAndIndex(hash common.Hash, idx uint) (*rpctypes.Transaction, error) {
if !q.enabled() {
return nil, errors.New(MsgFunctionDisable)
}
block, e := q.GetBlockByHash(hash, true)
if e != nil {
return nil, e
}
return q.getTransactionByBlockAndIndex(block, idx)
}
func (q Querier) getTransactionByBlockAndIndex(block *EthBlock, idx uint) (*rpctypes.Transaction, error) {
if block.Transactions == nil {
return nil, errors.New("no such transaction in target block")
}
txs := block.Transactions.([]rpctypes.Transaction)
for _, tx := range txs {
rawTx := tx
if idx == uint(*rawTx.TransactionIndex) {
return &rawTx, nil
}
}
return nil, errors.New("no such transaction in target block")
}