tomFlowee
c1cdbba72b
This new flag to the getBlock API call allows us to select a transaction based on the usage of a certain script opcode. This uses the new metadata index.
141 lines
4.1 KiB
C++
141 lines
4.1 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (C) 2021 Tom Zander <tom@flowee.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef BLOCKMETADATA_H
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#define BLOCKMETADATA_H
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#include <streaming/BufferPool.h>
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#include <streaming/ConstBuffer.h>
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#include <primitives/FastBlock.h>
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#include <vector>
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#include <deque>
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#include <memory>
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class BlockMetaData
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{
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public:
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/**
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* Constructor that loads the data from a buffer.
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* \see the static creation method parseBlock()
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*/
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BlockMetaData(const Streaming::ConstBuffer &buffer);
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/// invalid block
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BlockMetaData();
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/// copy constructor
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BlockMetaData(const BlockMetaData &other) = default;
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/**
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* Return true if this metadata object has proper fee data.
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* Since it is legal to construct a block meta data with no fees info and that simply
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* makes all the fees be set to zero (except for the coinbase one) it is helpful to
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* ask if fees are present.
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*/
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bool hasFeesData() const;
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/**
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* The proper way to create a new BlockMetaData and fill it with data.
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*
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* The perTxFees are required to have a list of lists, which when we put them all together make one
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* list of fee items per transaction, skipping the coinbase. So total fee objects is one less than all the
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* transactions in a block since the coinbase is not represented here.
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* The perTxFees can be an empty vector if no fees are present.
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*/
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static BlockMetaData parseBlock(int blockHeight, const FastBlock &block,
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const std::vector<std::unique_ptr<std::deque<std::int32_t> > > &perTxFees,
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Streaming::BufferPool &pool);
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/**
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* The per-transaction data.
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*/
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struct TransactionData {
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char txid[32];
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uint32_t offsetInBlock;
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uint32_t fees : 24;
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uint32_t scriptTags : 8;
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const TransactionData *next() const {
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return this + 1;
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}
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};
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/**
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* Find a transaction by txid.
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* This will walk over the list of transactions and find a match with /a txid.
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* We return a nullptr if no match was found.
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*/
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const TransactionData *findTransaction(const uint256 &txid) const;
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/**
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* Find a transaction by offset in block.
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* This will walk over the list of transactions and find a match with /a offsetInBlock.
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* We return a nullptr if no match was found.
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*/
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const TransactionData *findTransaction(int offsetInBlock) const;
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/**
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* Return the first transaction data (aka the coinbase).
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*/
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const TransactionData *first() const;
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/**
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* Returns the amount of transactions that are in this block.
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*/
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int txCount() const;
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/**
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* Return the TransactionData by index.
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* Coinbase is transaction zero.
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*/
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const TransactionData* tx(int index) const;
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/**
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* \internal
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* Returns the hard data.
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*/
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Streaming::ConstBuffer data() const;
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/**
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* Returns the blockheight this block was mined at.
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*/
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int blockHeight() const;
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/**
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* Returns true if the transactions are sorted by txid.
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*/
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bool ctorSorted() const;
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/**
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* Return the block id (or blockheader-hash) for this block.
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*/
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uint256 blockId() const;
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BlockMetaData &operator=(const BlockMetaData &other) = default;
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private:
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bool m_ctorSorted = false;
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int m_blockHeight = 0;
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uint256 m_blockId;
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Streaming::ConstBuffer m_data;
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Streaming::ConstBuffer m_transactions;
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};
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#endif
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