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null checks for #3364 and fix some bugs #1

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null checks for #3364 and fix some bugs #1

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38 changes: 21 additions & 17 deletions src/Neo/Ledger/MemoryPool.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,8 @@ namespace Neo.Ledger
/// </summary>
public class MemoryPool : IReadOnlyCollection<Transaction>
{
public event EventHandler<Transaction> TransactionAdded;
public event EventHandler<TransactionRemovedEventArgs> TransactionRemoved;
public event EventHandler<Transaction>? TransactionAdded;
public event EventHandler<TransactionRemovedEventArgs>? TransactionRemoved;

// Allow a reverified transaction to be rebroadcast if it has been this many block times since last broadcast.
private const int BlocksTillRebroadcast = 10;
Expand Down Expand Up @@ -162,14 +162,14 @@ public bool ContainsKey(UInt256 hash)
/// <param name="hash">The hash of the <see cref="Transaction"/> to get.</param>
/// <param name="tx">When this method returns, contains the <see cref="Transaction"/> associated with the specified hash, if the hash is found; otherwise, <see langword="null"/>.</param>
/// <returns><see langword="true"/> if the <see cref="MemoryPool"/> contains a <see cref="Transaction"/> with the specified hash; otherwise, <see langword="false"/>.</returns>
public bool TryGetValue(UInt256 hash, out Transaction tx)
public bool TryGetValue(UInt256 hash, out Transaction? tx)
{
_txRwLock.EnterReadLock();
try
{
bool ret = _unsortedTransactions.TryGetValue(hash, out PoolItem item)
var ret = _unsortedTransactions.TryGetValue(hash, out var item)
|| _unverifiedTransactions.TryGetValue(hash, out item);
tx = ret ? item.Tx : null;
tx = ret ? item!.Tx : null;
return ret;
}
finally
Expand Down Expand Up @@ -252,13 +252,13 @@ public IEnumerable<Transaction> GetSortedVerifiedTransactions()
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static PoolItem GetLowestFeeTransaction(SortedSet<PoolItem> verifiedTxSorted,
SortedSet<PoolItem> unverifiedTxSorted, out SortedSet<PoolItem> sortedPool)
private static PoolItem? GetLowestFeeTransaction(SortedSet<PoolItem> verifiedTxSorted,
SortedSet<PoolItem> unverifiedTxSorted, out SortedSet<PoolItem>? sortedPool)
{
PoolItem minItem = unverifiedTxSorted.Min;
var minItem = unverifiedTxSorted.Min;
sortedPool = minItem != null ? unverifiedTxSorted : null;

PoolItem verifiedMin = verifiedTxSorted.Min;
var verifiedMin = verifiedTxSorted.Min;
if (verifiedMin == null) return minItem;

if (minItem != null && verifiedMin.CompareTo(minItem) >= 0)
Expand All @@ -270,7 +270,7 @@ public IEnumerable<Transaction> GetSortedVerifiedTransactions()
return minItem;
}

private PoolItem GetLowestFeeTransaction(out Dictionary<UInt256, PoolItem> unsortedTxPool, out SortedSet<PoolItem> sortedPool)
private PoolItem? GetLowestFeeTransaction(out Dictionary<UInt256, PoolItem> unsortedTxPool, out SortedSet<PoolItem>? sortedPool)
{
sortedPool = null;

Expand All @@ -291,7 +291,10 @@ internal bool CanTransactionFitInPool(Transaction tx)
{
if (Count < Capacity) return true;

return GetLowestFeeTransaction(out _, out _).CompareTo(tx) <= 0;
var item = GetLowestFeeTransaction(out _, out _);
if (item == null) return false;
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This can fail if it's null


return item.CompareTo(tx) <= 0;
}

internal VerifyResult TryAdd(Transaction tx, DataCache snapshot)
Expand All @@ -305,7 +308,7 @@ internal VerifyResult TryAdd(Transaction tx, DataCache snapshot)

if (_unsortedTransactions.ContainsKey(tx.Hash)) return VerifyResult.AlreadyInPool;

List<Transaction> removedTransactions = null;
List<Transaction>? removedTransactions = null;
_txRwLock.EnterWriteLock();
try
{
Expand Down Expand Up @@ -378,7 +381,7 @@ private bool CheckConflicts(Transaction tx, out List<PoolItem> conflictsList)
// Step 2: check if unsorted transactions were in `tx`'s Conflicts attributes.
foreach (var hash in tx.GetAttributes<Conflicts>().Select(p => p.Hash))
{
if (_unsortedTransactions.TryGetValue(hash, out PoolItem unsortedTx))
if (_unsortedTransactions.TryGetValue(hash, out var unsortedTx))
{
if (!tx.Signers.Select(p => p.Account).Intersect(unsortedTx.Tx.Signers.Select(p => p.Account)).Any()) return false;
conflictsFeeSum += unsortedTx.Tx.NetworkFee;
Expand All @@ -400,7 +403,8 @@ private List<Transaction> RemoveOverCapacity()
List<Transaction> removedTransactions = new();
do
{
PoolItem minItem = GetLowestFeeTransaction(out var unsortedPool, out var sortedPool);
var minItem = GetLowestFeeTransaction(out var unsortedPool, out var sortedPool);
if (minItem == null || sortedPool == null) break;
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This can fail if it's null, because lime 259 and 262


unsortedPool.Remove(minItem.Tx.Hash);
sortedPool.Remove(minItem);
Expand All @@ -417,7 +421,7 @@ private List<Transaction> RemoveOverCapacity()
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
private bool TryRemoveVerified(UInt256 hash, out PoolItem item)
private bool TryRemoveVerified(UInt256 hash, out PoolItem? item)
{
if (!_unsortedTransactions.TryGetValue(hash, out item))
return false;
Expand All @@ -435,7 +439,7 @@ private void RemoveConflictsOfVerified(PoolItem item)
{
foreach (var h in item.Tx.GetAttributes<Conflicts>().Select(attr => attr.Hash))
{
if (_conflicts.TryGetValue(h, out HashSet<UInt256> conflicts))
if (_conflicts.TryGetValue(h, out var conflicts))
{
conflicts.Remove(item.Tx.Hash);
if (conflicts.Count() == 0)
Expand All @@ -447,7 +451,7 @@ private void RemoveConflictsOfVerified(PoolItem item)
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal bool TryRemoveUnVerified(UInt256 hash, out PoolItem item)
internal bool TryRemoveUnVerified(UInt256 hash, out PoolItem? item)
{
if (!_unverifiedTransactions.TryGetValue(hash, out item))
return false;
Expand Down
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