// Tests that if an account runs out of funds, any pending and queued transactions
// are dropped.
func TestTransactionDropping(t *testing.T) {
// Create a test account and fund it
pool, key := setupTxPool()
account, _ := transaction(0, big.NewInt(0), key).From()
state, _ := pool.currentState()
state.AddBalance(account, big.NewInt(1000))
// Add some pending and some queued transactions
var (
tx0 = transaction(0, big.NewInt(100), key)
tx1 = transaction(1, big.NewInt(200), key)
tx10 = transaction(10, big.NewInt(100), key)
tx11 = transaction(11, big.NewInt(200), key)
)
pool.addTx(tx0.Hash(), account, tx0)
pool.addTx(tx1.Hash(), account, tx1)
pool.queueTx(tx10.Hash(), tx10)
pool.queueTx(tx11.Hash(), tx11)
// Check that pre and post validations leave the pool as is
if len(pool.pending) != 2 {
t.Errorf("pending transaction mismatch: have %d, want %d", len(pool.pending), 2)
}
if len(pool.queue[account]) != 2 {
t.Errorf("queued transaction mismatch: have %d, want %d", len(pool.queue), 2)
}
pool.resetState()
if len(pool.pending) != 2 {
t.Errorf("pending transaction mismatch: have %d, want %d", len(pool.pending), 2)
}
if len(pool.queue[account]) != 2 {
t.Errorf("queued transaction mismatch: have %d, want %d", len(pool.queue), 2)
}
// Reduce the balance of the account, and check that invalidated transactions are dropped
state.AddBalance(account, big.NewInt(-750))
pool.resetState()
if _, ok := pool.pending[tx0.Hash()]; !ok {
t.Errorf("funded pending transaction missing: %v", tx0)
}
if _, ok := pool.pending[tx1.Hash()]; ok {
t.Errorf("out-of-fund pending transaction present: %v", tx1)
}
if _, ok := pool.queue[account][tx10.Hash()]; !ok {
t.Errorf("funded queued transaction missing: %v", tx10)
}
if _, ok := pool.queue[account][tx11.Hash()]; ok {
t.Errorf("out-of-fund queued transaction present: %v", tx11)
}
}
// Tests that if the transaction count belonging to a single account goes above
// some threshold, the higher transactions are dropped to prevent DOS attacks.
func TestTransactionQueueLimiting(t *testing.T) {
// Create a test account and fund it
pool, key := setupTxPool()
account, _ := transaction(0, big.NewInt(0), key).From()
state, _ := pool.currentState()
state.AddBalance(account, big.NewInt(1000000))
// Keep queuing up transactions and make sure all above a limit are dropped
for i := uint64(1); i <= maxQueued+5; i++ {
if err := pool.Add(transaction(i, big.NewInt(100000), key)); err != nil {
t.Fatalf("tx %d: failed to add transaction: %v", i, err)
}
if len(pool.pending) != 0 {
t.Errorf("tx %d: pending pool size mismatch: have %d, want %d", i, len(pool.pending), 0)
}
if i <= maxQueued {
if len(pool.queue[account]) != int(i) {
t.Errorf("tx %d: queue size mismatch: have %d, want %d", i, len(pool.queue[account]), i)
}
} else {
if len(pool.queue[account]) != maxQueued {
t.Errorf("tx %d: queue limit mismatch: have %d, want %d", i, len(pool.queue[account]), maxQueued)
}
}
}
}
func benchmarkCheckQueue(b *testing.B, size int) {
// Add a batch of transactions to a pool one by one
pool, key := setupTxPool()
account, _ := transaction(0, big.NewInt(0), key).From()
state, _ := pool.currentState()
state.AddBalance(account, big.NewInt(1000000))
for i := 0; i < size; i++ {
tx := transaction(uint64(1+i), big.NewInt(100000), key)
pool.queueTx(tx.Hash(), tx)
}
// Benchmark the speed of pool validation
b.ResetTimer()
for i := 0; i < b.N; i++ {
pool.checkQueue()
}
}
// Tests that if a transaction is dropped from the current pending pool (e.g. out
// of fund), all consecutive (still valid, but not executable) transactions are
// postponed back into the future queue to prevent broadcasting them.
func TestTransactionPostponing(t *testing.T) {
// Create a test account and fund it
pool, key := setupTxPool()
account, _ := transaction(0, big.NewInt(0), key).From()
state, _ := pool.currentState()
state.AddBalance(account, big.NewInt(1000))
// Add a batch consecutive pending transactions for validation
txns := []*types.Transaction{}
for i := 0; i < 100; i++ {
var tx *types.Transaction
if i%2 == 0 {
tx = transaction(uint64(i), big.NewInt(100), key)
} else {
tx = transaction(uint64(i), big.NewInt(500), key)
}
pool.addTx(tx.Hash(), account, tx)
txns = append(txns, tx)
}
// Check that pre and post validations leave the pool as is
if len(pool.pending) != len(txns) {
t.Errorf("pending transaction mismatch: have %d, want %d", len(pool.pending), len(txns))
}
if len(pool.queue[account]) != 0 {
t.Errorf("queued transaction mismatch: have %d, want %d", len(pool.queue), 0)
}
pool.resetState()
if len(pool.pending) != len(txns) {
t.Errorf("pending transaction mismatch: have %d, want %d", len(pool.pending), len(txns))
}
if len(pool.queue[account]) != 0 {
t.Errorf("queued transaction mismatch: have %d, want %d", len(pool.queue), 0)
}
// Reduce the balance of the account, and check that transactions are reorganised
state.AddBalance(account, big.NewInt(-750))
pool.resetState()
if _, ok := pool.pending[txns[0].Hash()]; !ok {
t.Errorf("tx %d: valid and funded transaction missing from pending pool: %v", 0, txns[0])
}
if _, ok := pool.queue[account][txns[0].Hash()]; ok {
t.Errorf("tx %d: valid and funded transaction present in future queue: %v", 0, txns[0])
}
for i, tx := range txns[1:] {
if i%2 == 1 {
if _, ok := pool.pending[tx.Hash()]; ok {
t.Errorf("tx %d: valid but future transaction present in pending pool: %v", i+1, tx)
}
if _, ok := pool.queue[account][tx.Hash()]; !ok {
t.Errorf("tx %d: valid but future transaction missing from future queue: %v", i+1, tx)
}
} else {
if _, ok := pool.pending[tx.Hash()]; ok {
t.Errorf("tx %d: out-of-fund transaction present in pending pool: %v", i+1, tx)
}
if _, ok := pool.queue[account][tx.Hash()]; ok {
t.Errorf("tx %d: out-of-fund transaction present in future queue: %v", i+1, tx)
}
}
}
}