public async Task ProcessesOrphans(MempoolBehavior behavior, Transaction tx)
        {
            Queue <OutPoint> vWorkQueue  = new Queue <OutPoint>();
            List <uint256>   vEraseQueue = new List <uint256>();

            var trxHash = tx.GetHash();

            for (var index = 0; index < tx.Outputs.Count; index++)
            {
                vWorkQueue.Enqueue(new OutPoint(trxHash, index));
            }

            // Recursively process any orphan transactions that depended on this one
            List <ulong> setMisbehaving = new List <ulong>();

            while (vWorkQueue.Any())
            {
                // mapOrphanTransactionsByPrev.TryGet() does a .ToList() to take a new collection
                // of orphans as this collection may be modifed later by anotehr thread
                var itByPrev = await this.MempoolScheduler.ReadAsync(() => this.mapOrphanTransactionsByPrev.TryGet(vWorkQueue.Dequeue())?.ToList());

                if (itByPrev == null)
                {
                    continue;
                }

                foreach (var mi in itByPrev)
                {
                    var orphanTx   = mi.Tx;                   //->second.tx;
                    var orphanHash = orphanTx.GetHash();
                    var fromPeer   = mi.NodeId;               // (*mi)->second.fromPeer;

                    if (setMisbehaving.Contains(fromPeer))
                    {
                        continue;
                    }

                    // Use a dummy CValidationState so someone can't setup nodes to counter-DoS based on orphan
                    // resolution (that is, feeding people an invalid transaction based on LegitTxX in order to get
                    // anyone relaying LegitTxX banned)
                    MempoolValidationState stateDummy = new MempoolValidationState(true);
                    if (await this.Validator.AcceptToMemoryPool(stateDummy, orphanTx))
                    {
                        Logging.Logs.Mempool.LogInformation($"accepted orphan tx {orphanHash}");
                        await behavior.RelayTransaction(orphanTx.GetHash());

                        this.signals.Transactions.Broadcast(orphanTx);
                        for (var index = 0; index < orphanTx.Outputs.Count; index++)
                        {
                            vWorkQueue.Enqueue(new OutPoint(orphanHash, index));
                        }
                        vEraseQueue.Add(orphanHash);
                    }
                    else if (!stateDummy.MissingInputs)
                    {
                        int nDos = 0;
                        if (stateDummy.IsInvalid && nDos > 0)
                        {
                            // Punish peer that gave us an invalid orphan tx
                            //Misbehaving(fromPeer, nDos);
                            setMisbehaving.Add(fromPeer);
                            Logging.Logs.Mempool.LogInformation($"invalid orphan tx {orphanHash}");
                        }
                        // Has inputs but not accepted to mempool
                        // Probably non-standard or insufficient fee/priority
                        Logging.Logs.Mempool.LogInformation($"removed orphan tx {orphanHash}");
                        vEraseQueue.Add(orphanHash);
                        if (!orphanTx.HasWitness && !stateDummy.CorruptionPossible)
                        {
                            // Do not use rejection cache for witness transactions or
                            // witness-stripped transactions, as they can have been malleated.
                            // See https://github.com/bitcoin/bitcoin/issues/8279 for details.
                            await this.MempoolScheduler.WriteAsync(() => this.recentRejects.TryAdd(orphanHash, orphanHash));
                        }
                    }
                    this.memPool.Check(new MempoolCoinView(this.coinView, this.memPool, this.MempoolScheduler, this.Validator));
                }
            }

            foreach (var hash in vEraseQueue)
            {
                await this.EraseOrphanTx(hash);
            }
        }
        private async Task AcceptToMemoryPoolWorker(MempoolValidationState state, Transaction tx, List <uint256> vHashTxnToUncache)
        {
            var context = new MempoolValidationContext(tx, state);

            this.PreMempoolChecks(context);

            // create the MemPoolCoinView and load relevant utxoset
            context.View = new MempoolCoinView(this.coinView, this.memPool, this.mempoolScheduler);
            await context.View.LoadView(context.Transaction).ConfigureAwait(false);

            // adding to the mem pool can only be done sequentially
            // use the sequential scheduler for that.
            await this.mempoolScheduler.WriteAsync(() =>
            {
                // is it already in the memory pool?
                if (this.memPool.Exists(context.TransactionHash))
                {
                    state.Invalid(MempoolErrors.InPool).Throw();
                }

                // Check for conflicts with in-memory transactions
                this.CheckConflicts(context);

                this.CheckMempoolCoinView(context);

                this.CreateMempoolEntry(context, state.AcceptTime);
                this.CheckSigOps(context);
                this.CheckFee(context);

                this.CheckRateLimit(context, state.LimitFree);

                this.CheckAncestors(context);
                this.CheckReplacment(context);
                this.CheckAllInputs(context);

                // Remove conflicting transactions from the mempool
                foreach (var it in context.AllConflicting)
                {
                    Logging.Logs.Mempool.LogInformation(
                        $"replacing tx {it.TransactionHash} with {context.TransactionHash} for {context.ModifiedFees - context.ConflictingFees} BTC additional fees, {context.EntrySize - context.ConflictingSize} delta bytes");
                }

                this.memPool.RemoveStaged(context.AllConflicting, false);

                // This transaction should only count for fee estimation if
                // the node is not behind and it is not dependent on any other
                // transactions in the mempool
                bool validForFeeEstimation = IsCurrentForFeeEstimation() && this.memPool.HasNoInputsOf(tx);

                // Store transaction in memory
                this.memPool.AddUnchecked(context.TransactionHash, context.Entry, context.SetAncestors, validForFeeEstimation);

                // trim mempool and check if tx was trimmed
                if (!state.OverrideMempoolLimit)
                {
                    LimitMempoolSize(this.nodeArgs.Mempool.MaxMempool * 1000000, this.nodeArgs.Mempool.MempoolExpiry * 60 * 60);

                    if (!this.memPool.Exists(context.TransactionHash))
                    {
                        state.Fail(MempoolErrors.Full).Throw();
                    }
                }

                // do this here inside the exclusive scheduler for better accuracy
                // and to avoid springing more concurrent tasks later
                state.MempoolSize        = this.memPool.Size;
                state.MempoolDynamicSize = this.memPool.DynamicMemoryUsage();

                this.PerformanceCounter.SetMempoolSize(state.MempoolSize);
                this.PerformanceCounter.SetMempoolDynamicSize(state.MempoolDynamicSize);
                this.PerformanceCounter.AddHitCount(1);
            });

            //	GetMainSignals().SyncTransaction(tx, NULL, CMainSignals::SYNC_TRANSACTION_NOT_IN_BLOCK);
        }
 public Task <bool> AcceptToMemoryPool(MempoolValidationState state, Transaction tx)
 {
     state.AcceptTime = dateTimeProvider.GetTime();
     return(AcceptToMemoryPoolWithTime(state, tx));
 }
Exemplo n.º 4
0
 public MempoolErrorException(MempoolValidationState state) : base(state.ErrorMessage)
 {
     ValidationState = state;
 }