lnd.xprv/sweep/test_utils.go

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package sweep
import (
"fmt"
"sync"
"testing"
"time"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/chainntnfs"
)
var (
defaultTestTimeout = 5 * time.Second
processingDelay = 1 * time.Second
mockChainHash, _ = chainhash.NewHashFromStr("00aabbccddeeff")
mockChainHeight = int32(100)
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)
// MockNotifier simulates the chain notifier for test purposes. This type is
// exported because it is used in nursery tests.
type MockNotifier struct {
confChannel map[chainhash.Hash]chan *chainntnfs.TxConfirmation
epochChan map[chan *chainntnfs.BlockEpoch]int32
spendChan map[wire.OutPoint][]chan *chainntnfs.SpendDetail
spends map[wire.OutPoint]*wire.MsgTx
mutex sync.RWMutex
t *testing.T
}
// NewMockNotifier instantiates a new mock notifier.
func NewMockNotifier(t *testing.T) *MockNotifier {
return &MockNotifier{
confChannel: make(map[chainhash.Hash]chan *chainntnfs.TxConfirmation),
epochChan: make(map[chan *chainntnfs.BlockEpoch]int32),
spendChan: make(map[wire.OutPoint][]chan *chainntnfs.SpendDetail),
spends: make(map[wire.OutPoint]*wire.MsgTx),
t: t,
}
}
// NotifyEpoch simulates a new epoch arriving.
func (m *MockNotifier) NotifyEpoch(height int32) {
m.t.Helper()
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for epochChan, chanHeight := range m.epochChan {
// Only send notifications if the height is greater than the
// height the caller passed into the register call.
if chanHeight >= height {
continue
}
log.Debugf("Notifying height %v to listener", height)
select {
case epochChan <- &chainntnfs.BlockEpoch{
Height: height,
}:
case <-time.After(defaultTestTimeout):
m.t.Fatal("epoch event not consumed")
}
}
}
// ConfirmTx simulates a tx confirming.
func (m *MockNotifier) ConfirmTx(txid *chainhash.Hash, height uint32) error {
confirm := &chainntnfs.TxConfirmation{
BlockHeight: height,
}
select {
case m.getConfChannel(txid) <- confirm:
case <-time.After(defaultTestTimeout):
return fmt.Errorf("confirmation not consumed")
}
return nil
}
// SpendOutpoint simulates a utxo being spent.
func (m *MockNotifier) SpendOutpoint(outpoint wire.OutPoint,
spendingTx wire.MsgTx) {
log.Debugf("Spending outpoint %v", outpoint)
m.mutex.Lock()
defer m.mutex.Unlock()
channels, ok := m.spendChan[outpoint]
if ok {
for _, channel := range channels {
m.sendSpend(channel, &outpoint, &spendingTx)
}
}
m.spends[outpoint] = &spendingTx
}
func (m *MockNotifier) sendSpend(channel chan *chainntnfs.SpendDetail,
outpoint *wire.OutPoint,
spendingTx *wire.MsgTx) {
spenderTxHash := spendingTx.TxHash()
channel <- &chainntnfs.SpendDetail{
SpenderTxHash: &spenderTxHash,
SpendingTx: spendingTx,
SpentOutPoint: outpoint,
}
}
// RegisterConfirmationsNtfn registers for tx confirm notifications.
func (m *MockNotifier) RegisterConfirmationsNtfn(txid *chainhash.Hash,
_ []byte, numConfs, heightHint uint32) (*chainntnfs.ConfirmationEvent,
error) {
return &chainntnfs.ConfirmationEvent{
Confirmed: m.getConfChannel(txid),
}, nil
}
func (m *MockNotifier) getConfChannel(
txid *chainhash.Hash) chan *chainntnfs.TxConfirmation {
m.mutex.Lock()
defer m.mutex.Unlock()
channel, ok := m.confChannel[*txid]
if ok {
return channel
}
channel = make(chan *chainntnfs.TxConfirmation)
m.confChannel[*txid] = channel
return channel
}
// RegisterBlockEpochNtfn registers a block notification.
func (m *MockNotifier) RegisterBlockEpochNtfn(
bestBlock *chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error) {
log.Tracef("Mock block ntfn registered")
m.mutex.Lock()
epochChan := make(chan *chainntnfs.BlockEpoch, 1)
// The real notifier returns a notification with the current block hash
// and height immediately if no best block hash or height is specified
// in the request. We want to emulate this behaviour as well for the
// mock.
switch {
case bestBlock == nil:
epochChan <- &chainntnfs.BlockEpoch{
Hash: mockChainHash,
Height: mockChainHeight,
}
m.epochChan[epochChan] = mockChainHeight
default:
m.epochChan[epochChan] = bestBlock.Height
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}
m.mutex.Unlock()
return &chainntnfs.BlockEpochEvent{
Epochs: epochChan,
Cancel: func() {
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log.Tracef("Mock block ntfn canceled")
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m.mutex.Lock()
delete(m.epochChan, epochChan)
m.mutex.Unlock()
},
}, nil
}
// Start the notifier.
func (m *MockNotifier) Start() error {
return nil
}
// Started checks if started
func (m *MockNotifier) Started() bool {
return true
}
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// Stop the notifier.
func (m *MockNotifier) Stop() error {
return nil
}
// RegisterSpendNtfn registers for spend notifications.
func (m *MockNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint,
_ []byte, heightHint uint32) (*chainntnfs.SpendEvent, error) {
// Add channel to global spend ntfn map.
m.mutex.Lock()
channels, ok := m.spendChan[*outpoint]
if !ok {
channels = make([]chan *chainntnfs.SpendDetail, 0)
}
channel := make(chan *chainntnfs.SpendDetail, 1)
channels = append(channels, channel)
m.spendChan[*outpoint] = channels
// Check if this output has already been spent.
spendingTx, spent := m.spends[*outpoint]
m.mutex.Unlock()
// If output has been spent already, signal now. Do this outside the
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// lock to prevent a deadlock.
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if spent {
m.sendSpend(channel, outpoint, spendingTx)
}
return &chainntnfs.SpendEvent{
Spend: channel,
Cancel: func() {
log.Infof("Cancelling RegisterSpendNtfn for %v",
outpoint)
m.mutex.Lock()
defer m.mutex.Unlock()
channels := m.spendChan[*outpoint]
for i, c := range channels {
if c == channel {
channels[i] = channels[len(channels)-1]
m.spendChan[*outpoint] =
channels[:len(channels)-1]
}
}
close(channel)
log.Infof("Spend ntfn channel closed for %v",
outpoint)
},
}, nil
}