lnd.xprv/htlcswitch/decayedlog_test.go

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package htlcswitch
import (
"crypto/rand"
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
"github.com/lightningnetwork/lightning-onion"
"github.com/lightningnetwork/lnd/chainntnfs"
)
const (
cltv uint32 = 100000
)
// tempDecayedLogPath creates a new temporary database path to back a single
// deccayed log instance.
func tempDecayedLogPath(t *testing.T) string {
dir, err := ioutil.TempDir("", "decayedlog")
if err != nil {
t.Fatalf("unable to create temporary decayed log dir: %v", err)
}
return filepath.Join(dir, "sphinxreplay.db")
}
// startup sets up the DecayedLog and possibly the garbage collector.
func startup(dbPath string, notifier bool) (sphinx.ReplayLog, *mockNotifier,
*sphinx.HashPrefix, error) {
var log sphinx.ReplayLog
var chainNotifier *mockNotifier
if notifier {
// Create the MockNotifier which triggers the garbage collector
chainNotifier = &mockNotifier{
epochChan: make(chan *chainntnfs.BlockEpoch, 1),
}
// Initialize the DecayedLog object
log = NewDecayedLog(dbPath, chainNotifier)
} else {
// Initialize the DecayedLog object
log = NewDecayedLog(dbPath, nil)
}
// Open the channeldb (start the garbage collector)
err := log.Start()
if err != nil {
return nil, nil, nil, err
}
// Create a HashPrefix identifier for a packet. Instead of actually
// generating an ECDH secret and hashing it, simulate with random bytes.
// This is used as a key to retrieve the cltv value.
var hashedSecret sphinx.HashPrefix
_, err = rand.Read(hashedSecret[:])
if err != nil {
return nil, nil, nil, err
}
return log, chainNotifier, &hashedSecret, nil
}
// shutdown deletes the temporary directory that the test database uses
// and handles closing the database.
func shutdown(dir string, d sphinx.ReplayLog) {
d.Stop()
os.RemoveAll(dir)
}
// TestDecayedLogGarbageCollector tests the ability of the garbage collector
// to delete expired cltv values every time a block is received. Expired cltv
// values are cltv values that are < current block height.
func TestDecayedLogGarbageCollector(t *testing.T) {
t.Parallel()
dbPath := tempDecayedLogPath(t)
d, notifier, hashedSecret, err := startup(dbPath, true)
if err != nil {
t.Fatalf("Unable to start up DecayedLog: %v", err)
}
defer shutdown(dbPath, d)
// Store <hashedSecret, cltv> in the sharedHashBucket.
err = d.Put(hashedSecret, cltv)
if err != nil {
t.Fatalf("Unable to store in channeldb: %v", err)
}
// Wait for database write (GC is in a goroutine)
time.Sleep(500 * time.Millisecond)
// Send block notifications to garbage collector. The garbage collector
// should remove the entry by block 100001.
// Send block 100000
notifier.epochChan <- &chainntnfs.BlockEpoch{
Height: 100000,
}
// Assert that hashedSecret is still in the sharedHashBucket
val, err := d.Get(hashedSecret)
if err != nil {
t.Fatalf("Get failed - received an error upon Get: %v", err)
}
if val != cltv {
t.Fatalf("GC incorrectly deleted CLTV")
}
// Send block 100001 (expiry block)
notifier.epochChan <- &chainntnfs.BlockEpoch{
Height: 100001,
}
// Wait for database write (GC is in a goroutine)
time.Sleep(500 * time.Millisecond)
// Assert that hashedSecret is not in the sharedHashBucket
val, err = d.Get(hashedSecret)
if err == nil {
t.Fatalf("CLTV was not deleted")
}
if err != sphinx.ErrLogEntryNotFound {
t.Fatalf("Get failed - received unexpected error upon Get: %v", err)
}
}
// TestDecayedLogPersistentGarbageCollector tests the persistence property of
// the garbage collector. The garbage collector will be restarted immediately and
// a block that expires the stored CLTV value will be sent to the ChainNotifier.
// We test that this causes the <hashedSecret, CLTV> pair to be deleted even
// on GC restarts.
func TestDecayedLogPersistentGarbageCollector(t *testing.T) {
t.Parallel()
dbPath := tempDecayedLogPath(t)
d, _, hashedSecret, err := startup(dbPath, true)
if err != nil {
t.Fatalf("Unable to start up DecayedLog: %v", err)
}
defer shutdown(dbPath, d)
// Store <hashedSecret, cltv> in the sharedHashBucket
if err = d.Put(hashedSecret, cltv); err != nil {
t.Fatalf("Unable to store in channeldb: %v", err)
}
// Wait for database write (GC is in a goroutine)
time.Sleep(500 * time.Millisecond)
// Shut down DecayedLog and the garbage collector along with it.
d.Stop()
d2, notifier2, hashedSecret2, err := startup(dbPath, true)
if err != nil {
t.Fatalf("Unable to restart DecayedLog: %v", err)
}
defer shutdown(dbPath, d2)
// Send a block notification to the garbage collector that expires
// the stored CLTV.
notifier2.epochChan <- &chainntnfs.BlockEpoch{
Height: int32(100001),
}
// Wait for database write (GC is in a goroutine)
time.Sleep(500 * time.Millisecond)
// Assert that hashedSecret is not in the sharedHashBucket
_, err = d2.Get(hashedSecret2)
if err == nil {
t.Fatalf("CLTV was not deleted")
}
if err != sphinx.ErrLogEntryNotFound {
t.Fatalf("Get failed - received unexpected error upon Get: %v", err)
}
}
// TestDecayedLogInsertionAndRetrieval inserts a cltv value into the
// sharedHashBucket and then deletes it and finally asserts that we can no
// longer retrieve it.
func TestDecayedLogInsertionAndDeletion(t *testing.T) {
t.Parallel()
dbPath := tempDecayedLogPath(t)
d, _, hashedSecret, err := startup(dbPath, false)
if err != nil {
t.Fatalf("Unable to start up DecayedLog: %v", err)
}
defer shutdown(dbPath, d)
// Store <hashedSecret, cltv> in the sharedHashBucket.
err = d.Put(hashedSecret, cltv)
if err != nil {
t.Fatalf("Unable to store in channeldb: %v", err)
}
// Delete hashedSecret from the sharedHashBucket.
err = d.Delete(hashedSecret)
if err != nil {
t.Fatalf("Unable to delete from channeldb: %v", err)
}
// Assert that hashedSecret is not in the sharedHashBucket
_, err = d.Get(hashedSecret)
if err == nil {
t.Fatalf("CLTV was not deleted")
}
if err != sphinx.ErrLogEntryNotFound {
t.Fatalf("Get failed - received unexpected error upon Get: %v", err)
}
}
// TestDecayedLogStartAndStop tests for persistence. The DecayedLog is started,
// a cltv value is stored in the sharedHashBucket, and then it the DecayedLog
// is stopped. The DecayedLog is then started up again and we test that the
// cltv value is indeed still stored in the sharedHashBucket. We then delete
// the cltv value and check that it persists upon startup.
func TestDecayedLogStartAndStop(t *testing.T) {
t.Parallel()
dbPath := tempDecayedLogPath(t)
d, _, hashedSecret, err := startup(dbPath, false)
if err != nil {
t.Fatalf("Unable to start up DecayedLog: %v", err)
}
defer shutdown(dbPath, d)
// Store <hashedSecret, cltv> in the sharedHashBucket.
err = d.Put(hashedSecret, cltv)
if err != nil {
t.Fatalf("Unable to store in channeldb: %v", err)
}
// Shutdown the DecayedLog's channeldb
d.Stop()
d2, _, hashedSecret2, err := startup(dbPath, false)
if err != nil {
t.Fatalf("Unable to restart DecayedLog: %v", err)
}
defer shutdown(dbPath, d2)
// Retrieve the stored cltv value given the hashedSecret key.
value, err := d2.Get(hashedSecret)
if err != nil {
t.Fatalf("Unable to retrieve from channeldb: %v", err)
}
// Check that the original cltv value matches the retrieved cltv
// value.
if cltv != value {
t.Fatalf("Value retrieved doesn't match value stored")
}
// Delete hashedSecret from sharedHashBucket
err = d2.Delete(hashedSecret2)
if err != nil {
t.Fatalf("Unable to delete from channeldb: %v", err)
}
// Shutdown the DecayedLog's channeldb
d2.Stop()
d3, _, hashedSecret3, err := startup(dbPath, false)
if err != nil {
t.Fatalf("Unable to restart DecayedLog: %v", err)
}
defer shutdown(dbPath, d3)
// Assert that hashedSecret is not in the sharedHashBucket
_, err = d3.Get(hashedSecret3)
if err == nil {
t.Fatalf("CLTV was not deleted")
}
if err != sphinx.ErrLogEntryNotFound {
t.Fatalf("Get failed - received unexpected error upon Get: %v", err)
}
}
// TestDecayedLogStorageAndRetrieval stores a cltv value and then retrieves it
// via the nested sharedHashBucket and finally asserts that the original stored
// and retrieved cltv values are equal.
func TestDecayedLogStorageAndRetrieval(t *testing.T) {
t.Parallel()
dbPath := tempDecayedLogPath(t)
d, _, hashedSecret, err := startup(dbPath, false)
if err != nil {
t.Fatalf("Unable to start up DecayedLog: %v", err)
}
defer shutdown(dbPath, d)
// Store <hashedSecret, cltv> in the sharedHashBucket
err = d.Put(hashedSecret, cltv)
if err != nil {
t.Fatalf("Unable to store in channeldb: %v", err)
}
// Retrieve the stored cltv value given the hashedSecret key.
value, err := d.Get(hashedSecret)
if err != nil {
t.Fatalf("Unable to retrieve from channeldb: %v", err)
}
// If the original cltv value does not match the value retrieved,
// then the test failed.
if cltv != value {
t.Fatalf("Value retrieved doesn't match value stored")
}
}