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txmgr.go
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txmgr.go
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package goethx
import (
"context"
"fmt"
"math/big"
"sync"
"time"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/sirupsen/logrus"
)
// ethCli represents the interface we need to assess a tx
type ethCli interface {
HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
ethereum.TransactionReader
}
// TxMgr will allow listening to transactions
type TxMgr struct {
Logger logrus.StdLogger
Cli ethCli
BlockCountValid int64
PollingInterval time.Duration
PollingTimeOut time.Duration
TxProcessing map[common.Hash]bool
Mutex *sync.Mutex
}
// NewTxMgr will return an TxListener entity
func NewTxMgr(
lg logrus.StdLogger,
cli ethCli,
bcv int64,
pi time.Duration,
pto time.Duration,
) *TxMgr {
return &TxMgr{
Logger: lg,
Cli: cli,
BlockCountValid: bcv,
PollingInterval: pi,
PollingTimeOut: pto,
TxProcessing: make(map[common.Hash]bool),
Mutex: &sync.Mutex{},
}
}
// TxMsg is the message sent through the channel
type TxMsg struct {
Hash common.Hash
Status TxStatus
Err error
}
// MonitorTx will monitor a tx until success, error or timeout
func (txm *TxMgr) MonitorTx(
ctx context.Context,
txH common.Hash,
chTx chan TxMsg,
) {
timeout := time.After(txm.PollingTimeOut)
var succTxBlock *big.Int
t := time.NewTicker(txm.PollingInterval)
for c := t.C; ; {
var errT error
var txS TxStatus
txS, succTxBlock, errT = txm.checkTx(ctx, txH, succTxBlock)
if errT != nil {
chTx <- TxMsg{
Hash: txH,
Status: TxNil,
Err: fmt.Errorf(
"MonitorTx(%s): %v - tx status %s",
txH.String(), errT, txS.String(),
),
}
return
}
if txS == TxSuccess {
chTx <- TxMsg{
Hash: txH,
Status: TxSuccess,
Err: nil,
}
return
}
select {
case <-c:
continue
case <-timeout:
chTx <- TxMsg{
Hash: txH,
Status: TxTimeOut,
Err: fmt.Errorf(
"MonitorTx(%s): time out after %s with status %s",
txH.String(),
txm.PollingTimeOut,
txS.String(),
),
}
return
case <-ctx.Done():
chTx <- TxMsg{
Hash: txH,
Status: TxTimeOut,
Err: fmt.Errorf(
"MonitorTx(%s): context was canceled",
txH.String(),
),
}
return
}
}
}
func (txm *TxMgr) checkTx(
ctx context.Context,
txH common.Hash,
succTxBlock *big.Int,
) (TxStatus, *big.Int, error) {
if txm.checkTxStatus(ctx, txH) == TxSuccess {
if succTxBlock == nil {
hdrSuccessBlock, errH := txm.Cli.HeaderByNumber(ctx, nil)
if errH != nil {
return TxNil, nil,
fmt.Errorf("checkTx(%s): %v", txH.String(), errH)
}
succTxBlock = hdrSuccessBlock.Number
}
isEnough, errB := txm.enoughBlocksSince(ctx, succTxBlock)
if errB != nil {
return TxNil, succTxBlock,
fmt.Errorf("checkTx(%s): %v", txH.String(), errB)
}
if isEnough {
return TxSuccess, succTxBlock, nil
} else {
return TxSuccessNotEnoughBlocks, succTxBlock, nil
}
}
return TxPending, nil, nil
}
func (txm *TxMgr) enoughBlocksSince(
ctx context.Context,
bn *big.Int,
) (bool, error) {
// Get current block number
hdr, errH := txm.Cli.HeaderByNumber(ctx, nil)
if errH != nil {
return false, fmt.Errorf("enoughBlocksSince(%s): %v", bn, errH)
}
var expBN big.Int
if expBN.Add(bn, big.NewInt(txm.BlockCountValid)).Cmp(hdr.Number) <= 0 {
return true, nil
}
return false, nil
}
// checkTxStatus returns the status if the tx
func (txm *TxMgr) checkTxStatus(
ctx context.Context,
txH common.Hash,
) TxStatus {
_, isPending, errTbH := txm.Cli.TransactionByHash(ctx, txH)
if errTbH == ethereum.NotFound {
return TxNotFound
}
if errTbH != nil {
return TxError
}
if isPending {
return TxPending
}
rec, errTxR := txm.Cli.TransactionReceipt(ctx, txH)
if errTxR == ethereum.NotFound {
return TxNotFound
}
if errTxR != nil {
return TxError
}
// if incomplete receipt
if rec == nil {
return TxPending
}
// if rec.Status == types.ReceiptStatusFailed {
// return TxError
// }
if rec.Status == types.ReceiptStatusSuccessful {
return TxSuccess
}
return TxPending
}