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Move CMerkleBlock and CPartialMerkleTree to their own file

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This commit is contained in:
Matt Corallo 2014-10-30 15:50:15 -07:00
parent a0417b8cc8
commit afd4b94b6d
9 changed files with 318 additions and 294 deletions
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2
src/Makefile.am
View file

@ -101,6 +101,7 @@ BITCOIN_CORE_H = \
leveldbwrapper.h \
limitedmap.h \
main.h \
merkleblock.h \
miner.h \
mruset.h \
netbase.h \
@ -168,6 +169,7 @@ libbitcoin_server_a_SOURCES = \
init.cpp \
leveldbwrapper.cpp \
main.cpp \
merkleblock.cpp \
miner.cpp \
net.cpp \
noui.cpp \

4
src/bitcoin-tx.cpp
View file

@ -4,15 +4,17 @@
#include "base58.h"
#include "clientversion.h"
#include "primitives/block.h" // for MAX_BLOCK_SIZE
#include "primitives/transaction.h"
#include "core_io.h"
#include "coins.h"
#include "keystore.h"
#include "main.h" // for MAX_BLOCK_SIZE
#include "script/script.h"
#include "script/sign.h"
#include "ui_interface.h" // for _(...)
#include "univalue/univalue.h"
#include "util.h"
#include "utilstrencodings.h"
#include "utilmoneystr.h"
#include <stdio.h>

154
src/main.cpp
View file

@ -11,6 +11,7 @@
#include "checkpoints.h"
#include "checkqueue.h"
#include "init.h"
#include "merkleblock.h"
#include "net.h"
#include "pow.h"
#include "txdb.h"
@ -2720,159 +2721,6 @@ bool TestBlockValidity(CValidationState &state, const CBlock& block, CBlockIndex
CMerkleBlock::CMerkleBlock(const CBlock& block, CBloomFilter& filter)
{
header = block.GetBlockHeader();
vector<bool> vMatch;
vector<uint256> vHashes;
vMatch.reserve(block.vtx.size());
vHashes.reserve(block.vtx.size());
for (unsigned int i = 0; i < block.vtx.size(); i++)
{
const uint256& hash = block.vtx[i].GetHash();
if (filter.IsRelevantAndUpdate(block.vtx[i]))
{
vMatch.push_back(true);
vMatchedTxn.push_back(make_pair(i, hash));
}
else
vMatch.push_back(false);
vHashes.push_back(hash);
}
txn = CPartialMerkleTree(vHashes, vMatch);
}
uint256 CPartialMerkleTree::CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid) {
if (height == 0) {
// hash at height 0 is the txids themself
return vTxid[pos];
} else {
// calculate left hash
uint256 left = CalcHash(height-1, pos*2, vTxid), right;
// calculate right hash if not beyond the end of the array - copy left hash otherwise1
if (pos*2+1 < CalcTreeWidth(height-1))
right = CalcHash(height-1, pos*2+1, vTxid);
else
right = left;
// combine subhashes
return Hash(BEGIN(left), END(left), BEGIN(right), END(right));
}
}
void CPartialMerkleTree::TraverseAndBuild(int height, unsigned int pos, const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch) {
// determine whether this node is the parent of at least one matched txid
bool fParentOfMatch = false;
for (unsigned int p = pos << height; p < (pos+1) << height && p < nTransactions; p++)
fParentOfMatch |= vMatch[p];
// store as flag bit
vBits.push_back(fParentOfMatch);
if (height==0 || !fParentOfMatch) {
// if at height 0, or nothing interesting below, store hash and stop
vHash.push_back(CalcHash(height, pos, vTxid));
} else {
// otherwise, don't store any hash, but descend into the subtrees
TraverseAndBuild(height-1, pos*2, vTxid, vMatch);
if (pos*2+1 < CalcTreeWidth(height-1))
TraverseAndBuild(height-1, pos*2+1, vTxid, vMatch);
}
}
uint256 CPartialMerkleTree::TraverseAndExtract(int height, unsigned int pos, unsigned int &nBitsUsed, unsigned int &nHashUsed, std::vector<uint256> &vMatch) {
if (nBitsUsed >= vBits.size()) {
// overflowed the bits array - failure
fBad = true;
return 0;
}
bool fParentOfMatch = vBits[nBitsUsed++];
if (height==0 || !fParentOfMatch) {
// if at height 0, or nothing interesting below, use stored hash and do not descend
if (nHashUsed >= vHash.size()) {
// overflowed the hash array - failure
fBad = true;
return 0;
}
const uint256 &hash = vHash[nHashUsed++];
if (height==0 && fParentOfMatch) // in case of height 0, we have a matched txid
vMatch.push_back(hash);
return hash;
} else {
// otherwise, descend into the subtrees to extract matched txids and hashes
uint256 left = TraverseAndExtract(height-1, pos*2, nBitsUsed, nHashUsed, vMatch), right;
if (pos*2+1 < CalcTreeWidth(height-1))
right = TraverseAndExtract(height-1, pos*2+1, nBitsUsed, nHashUsed, vMatch);
else
right = left;
// and combine them before returning
return Hash(BEGIN(left), END(left), BEGIN(right), END(right));
}
}
CPartialMerkleTree::CPartialMerkleTree(const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch) : nTransactions(vTxid.size()), fBad(false) {
// reset state
vBits.clear();
vHash.clear();
// calculate height of tree
int nHeight = 0;
while (CalcTreeWidth(nHeight) > 1)
nHeight++;
// traverse the partial tree
TraverseAndBuild(nHeight, 0, vTxid, vMatch);
}
CPartialMerkleTree::CPartialMerkleTree() : nTransactions(0), fBad(true) {}
uint256 CPartialMerkleTree::ExtractMatches(std::vector<uint256> &vMatch) {
vMatch.clear();
// An empty set will not work
if (nTransactions == 0)
return 0;
// check for excessively high numbers of transactions
if (nTransactions > MAX_BLOCK_SIZE / 60) // 60 is the lower bound for the size of a serialized CTransaction
return 0;
// there can never be more hashes provided than one for every txid
if (vHash.size() > nTransactions)
return 0;
// there must be at least one bit per node in the partial tree, and at least one node per hash
if (vBits.size() < vHash.size())
return 0;
// calculate height of tree
int nHeight = 0;
while (CalcTreeWidth(nHeight) > 1)
nHeight++;
// traverse the partial tree
unsigned int nBitsUsed = 0, nHashUsed = 0;
uint256 hashMerkleRoot = TraverseAndExtract(nHeight, 0, nBitsUsed, nHashUsed, vMatch);
// verify that no problems occured during the tree traversal
if (fBad)
return 0;
// verify that all bits were consumed (except for the padding caused by serializing it as a byte sequence)
if ((nBitsUsed+7)/8 != (vBits.size()+7)/8)
return 0;
// verify that all hashes were consumed
if (nHashUsed != vHash.size())
return 0;
return hashMerkleRoot;
}
bool AbortNode(const std::string &strMessage, const std::string &userMessage) {
strMiscWarning = strMessage;
LogPrintf("*** %s\n", strMessage);

138
src/main.h
View file

@ -49,8 +49,6 @@ class CValidationState;
struct CBlockTemplate;
struct CNodeStateStats;
/** The maximum allowed size for a serialized block, in bytes (network rule) */
static const unsigned int MAX_BLOCK_SIZE = 1000000;
/** Default for -blockmaxsize and -blockminsize, which control the range of sizes the mining code will create **/
static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
static const unsigned int DEFAULT_BLOCK_MIN_SIZE = 0;
@ -352,110 +350,6 @@ public:
}
};
/** Data structure that represents a partial merkle tree.
*
* It represents a subset of the txid's of a known block, in a way that
* allows recovery of the list of txid's and the merkle root, in an
* authenticated way.
*
* The encoding works as follows: we traverse the tree in depth-first order,
* storing a bit for each traversed node, signifying whether the node is the
* parent of at least one matched leaf txid (or a matched txid itself). In
* case we are at the leaf level, or this bit is 0, its merkle node hash is
* stored, and its children are not explorer further. Otherwise, no hash is
* stored, but we recurse into both (or the only) child branch. During
* decoding, the same depth-first traversal is performed, consuming bits and
* hashes as they written during encoding.
*
* The serialization is fixed and provides a hard guarantee about the
* encoded size:
*
* SIZE <= 10 + ceil(32.25*N)
*
* Where N represents the number of leaf nodes of the partial tree. N itself
* is bounded by:
*
* N <= total_transactions
* N <= 1 + matched_transactions*tree_height
*
* The serialization format:
* - uint32 total_transactions (4 bytes)
* - varint number of hashes (1-3 bytes)
* - uint256[] hashes in depth-first order (<= 32*N bytes)
* - varint number of bytes of flag bits (1-3 bytes)
* - byte[] flag bits, packed per 8 in a byte, least significant bit first (<= 2*N-1 bits)
* The size constraints follow from this.
*/
class CPartialMerkleTree
{
protected:
/** the total number of transactions in the block */
unsigned int nTransactions;
/** node-is-parent-of-matched-txid bits */
std::vector<bool> vBits;
/** txids and internal hashes */
std::vector<uint256> vHash;
/** flag set when encountering invalid data */
bool fBad;
/** helper function to efficiently calculate the number of nodes at given height in the merkle tree */
unsigned int CalcTreeWidth(int height) {
return (nTransactions+(1 << height)-1) >> height;
}
/** calculate the hash of a node in the merkle tree (at leaf level: the txid's themselves) */
uint256 CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid);
/** recursive function that traverses tree nodes, storing the data as bits and hashes */
void TraverseAndBuild(int height, unsigned int pos, const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch);
/**
* recursive function that traverses tree nodes, consuming the bits and hashes produced by TraverseAndBuild.
* it returns the hash of the respective node.
*/
uint256 TraverseAndExtract(int height, unsigned int pos, unsigned int &nBitsUsed, unsigned int &nHashUsed, std::vector<uint256> &vMatch);
public:
/** serialization implementation */
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(nTransactions);
READWRITE(vHash);
std::vector<unsigned char> vBytes;
if (ser_action.ForRead()) {
READWRITE(vBytes);
CPartialMerkleTree &us = *(const_cast<CPartialMerkleTree*>(this));
us.vBits.resize(vBytes.size() * 8);
for (unsigned int p = 0; p < us.vBits.size(); p++)
us.vBits[p] = (vBytes[p / 8] & (1 << (p % 8))) != 0;
us.fBad = false;
} else {
vBytes.resize((vBits.size()+7)/8);
for (unsigned int p = 0; p < vBits.size(); p++)
vBytes[p / 8] |= vBits[p] << (p % 8);
READWRITE(vBytes);
}
}
/** Construct a partial merkle tree from a list of transaction id's, and a mask that selects a subset of them */
CPartialMerkleTree(const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch);
CPartialMerkleTree();
/**
* extract the matching txid's represented by this partial merkle tree.
* returns the merkle root, or 0 in case of failure
*/
uint256 ExtractMatches(std::vector<uint256> &vMatch);
};
/** Functions for disk access for blocks */
bool WriteBlockToDisk(CBlock& block, CDiskBlockPos& pos);
@ -646,38 +540,6 @@ struct CBlockTemplate
/**
* Used to relay blocks as header + vector<merkle branch>
* to filtered nodes.
*/
class CMerkleBlock
{
public:
/** Public only for unit testing */
CBlockHeader header;
CPartialMerkleTree txn;
public:
/** Public only for unit testing and relay testing (not relayed) */
std::vector<std::pair<unsigned int, uint256> > vMatchedTxn;
/**
* Create from a CBlock, filtering transactions according to filter
* Note that this will call IsRelevantAndUpdate on the filter for each transaction,
* thus the filter will likely be modified.
*/
CMerkleBlock(const CBlock& block, CBloomFilter& filter);
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(header);
READWRITE(txn);
}
};
class CValidationInterface {
protected:
virtual void SyncTransaction(const CTransaction &tx, const CBlock *pblock) {};

152
src/merkleblock.cpp Normal file
View file

@ -0,0 +1,152 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "merkleblock.h"
#include "hash.h"
#include "primitives/block.h" // for MAX_BLOCK_SIZE
#include "utilstrencodings.h"
using namespace std;
CMerkleBlock::CMerkleBlock(const CBlock& block, CBloomFilter& filter)
{
header = block.GetBlockHeader();
vector<bool> vMatch;
vector<uint256> vHashes;
vMatch.reserve(block.vtx.size());
vHashes.reserve(block.vtx.size());
for (unsigned int i = 0; i < block.vtx.size(); i++)
{
const uint256& hash = block.vtx[i].GetHash();
if (filter.IsRelevantAndUpdate(block.vtx[i]))
{
vMatch.push_back(true);
vMatchedTxn.push_back(make_pair(i, hash));
}
else
vMatch.push_back(false);
vHashes.push_back(hash);
}
txn = CPartialMerkleTree(vHashes, vMatch);
}
uint256 CPartialMerkleTree::CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid) {
if (height == 0) {
// hash at height 0 is the txids themself
return vTxid[pos];
} else {
// calculate left hash
uint256 left = CalcHash(height-1, pos*2, vTxid), right;
// calculate right hash if not beyond the end of the array - copy left hash otherwise1
if (pos*2+1 < CalcTreeWidth(height-1))
right = CalcHash(height-1, pos*2+1, vTxid);
else
right = left;
// combine subhashes
return Hash(BEGIN(left), END(left), BEGIN(right), END(right));
}
}
void CPartialMerkleTree::TraverseAndBuild(int height, unsigned int pos, const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch) {
// determine whether this node is the parent of at least one matched txid
bool fParentOfMatch = false;
for (unsigned int p = pos << height; p < (pos+1) << height && p < nTransactions; p++)
fParentOfMatch |= vMatch[p];
// store as flag bit
vBits.push_back(fParentOfMatch);
if (height==0 || !fParentOfMatch) {
// if at height 0, or nothing interesting below, store hash and stop
vHash.push_back(CalcHash(height, pos, vTxid));
} else {
// otherwise, don't store any hash, but descend into the subtrees
TraverseAndBuild(height-1, pos*2, vTxid, vMatch);
if (pos*2+1 < CalcTreeWidth(height-1))
TraverseAndBuild(height-1, pos*2+1, vTxid, vMatch);
}
}
uint256 CPartialMerkleTree::TraverseAndExtract(int height, unsigned int pos, unsigned int &nBitsUsed, unsigned int &nHashUsed, std::vector<uint256> &vMatch) {
if (nBitsUsed >= vBits.size()) {
// overflowed the bits array - failure
fBad = true;
return 0;
}
bool fParentOfMatch = vBits[nBitsUsed++];
if (height==0 || !fParentOfMatch) {
// if at height 0, or nothing interesting below, use stored hash and do not descend
if (nHashUsed >= vHash.size()) {
// overflowed the hash array - failure
fBad = true;
return 0;
}
const uint256 &hash = vHash[nHashUsed++];
if (height==0 && fParentOfMatch) // in case of height 0, we have a matched txid
vMatch.push_back(hash);
return hash;
} else {
// otherwise, descend into the subtrees to extract matched txids and hashes
uint256 left = TraverseAndExtract(height-1, pos*2, nBitsUsed, nHashUsed, vMatch), right;
if (pos*2+1 < CalcTreeWidth(height-1))
right = TraverseAndExtract(height-1, pos*2+1, nBitsUsed, nHashUsed, vMatch);
else
right = left;
// and combine them before returning
return Hash(BEGIN(left), END(left), BEGIN(right), END(right));
}
}
CPartialMerkleTree::CPartialMerkleTree(const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch) : nTransactions(vTxid.size()), fBad(false) {
// reset state
vBits.clear();
vHash.clear();
// calculate height of tree
int nHeight = 0;
while (CalcTreeWidth(nHeight) > 1)
nHeight++;
// traverse the partial tree
TraverseAndBuild(nHeight, 0, vTxid, vMatch);
}
CPartialMerkleTree::CPartialMerkleTree() : nTransactions(0), fBad(true) {}
uint256 CPartialMerkleTree::ExtractMatches(std::vector<uint256> &vMatch) {
vMatch.clear();
// An empty set will not work
if (nTransactions == 0)
return 0;
// check for excessively high numbers of transactions
if (nTransactions > MAX_BLOCK_SIZE / 60) // 60 is the lower bound for the size of a serialized CTransaction
return 0;
// there can never be more hashes provided than one for every txid
if (vHash.size() > nTransactions)
return 0;
// there must be at least one bit per node in the partial tree, and at least one node per hash
if (vBits.size() < vHash.size())
return 0;
// calculate height of tree
int nHeight = 0;
while (CalcTreeWidth(nHeight) > 1)
nHeight++;
// traverse the partial tree
unsigned int nBitsUsed = 0, nHashUsed = 0;
uint256 hashMerkleRoot = TraverseAndExtract(nHeight, 0, nBitsUsed, nHashUsed, vMatch);
// verify that no problems occured during the tree traversal
if (fBad)
return 0;
// verify that all bits were consumed (except for the padding caused by serializing it as a byte sequence)
if ((nBitsUsed+7)/8 != (vBits.size()+7)/8)
return 0;
// verify that all hashes were consumed
if (nHashUsed != vHash.size())
return 0;
return hashMerkleRoot;
}

151
src/merkleblock.h Normal file
View file

@ -0,0 +1,151 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_MERKLEBLOCK_H
#define BITCOIN_MERKLEBLOCK_H
#include "serialize.h"
#include "uint256.h"
#include "primitives/block.h"
#include "bloom.h"
#include <vector>
/** Data structure that represents a partial merkle tree.
*
* It represents a subset of the txid's of a known block, in a way that
* allows recovery of the list of txid's and the merkle root, in an
* authenticated way.
*
* The encoding works as follows: we traverse the tree in depth-first order,
* storing a bit for each traversed node, signifying whether the node is the
* parent of at least one matched leaf txid (or a matched txid itself). In
* case we are at the leaf level, or this bit is 0, its merkle node hash is
* stored, and its children are not explorer further. Otherwise, no hash is
* stored, but we recurse into both (or the only) child branch. During
* decoding, the same depth-first traversal is performed, consuming bits and
* hashes as they written during encoding.
*
* The serialization is fixed and provides a hard guarantee about the
* encoded size:
*
* SIZE <= 10 + ceil(32.25*N)
*
* Where N represents the number of leaf nodes of the partial tree. N itself
* is bounded by:
*
* N <= total_transactions
* N <= 1 + matched_transactions*tree_height
*
* The serialization format:
* - uint32 total_transactions (4 bytes)
* - varint number of hashes (1-3 bytes)
* - uint256[] hashes in depth-first order (<= 32*N bytes)
* - varint number of bytes of flag bits (1-3 bytes)
* - byte[] flag bits, packed per 8 in a byte, least significant bit first (<= 2*N-1 bits)
* The size constraints follow from this.
*/
class CPartialMerkleTree
{
protected:
/** the total number of transactions in the block */
unsigned int nTransactions;
/** node-is-parent-of-matched-txid bits */
std::vector<bool> vBits;
/** txids and internal hashes */
std::vector<uint256> vHash;
/** flag set when encountering invalid data */
bool fBad;
/** helper function to efficiently calculate the number of nodes at given height in the merkle tree */
unsigned int CalcTreeWidth(int height) {
return (nTransactions+(1 << height)-1) >> height;
}
/** calculate the hash of a node in the merkle tree (at leaf level: the txid's themselves) */
uint256 CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid);
/** recursive function that traverses tree nodes, storing the data as bits and hashes */
void TraverseAndBuild(int height, unsigned int pos, const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch);
/**
* recursive function that traverses tree nodes, consuming the bits and hashes produced by TraverseAndBuild.
* it returns the hash of the respective node.
*/
uint256 TraverseAndExtract(int height, unsigned int pos, unsigned int &nBitsUsed, unsigned int &nHashUsed, std::vector<uint256> &vMatch);
public:
/** serialization implementation */
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(nTransactions);
READWRITE(vHash);
std::vector<unsigned char> vBytes;
if (ser_action.ForRead()) {
READWRITE(vBytes);
CPartialMerkleTree &us = *(const_cast<CPartialMerkleTree*>(this));
us.vBits.resize(vBytes.size() * 8);
for (unsigned int p = 0; p < us.vBits.size(); p++)
us.vBits[p] = (vBytes[p / 8] & (1 << (p % 8))) != 0;
us.fBad = false;
} else {
vBytes.resize((vBits.size()+7)/8);
for (unsigned int p = 0; p < vBits.size(); p++)
vBytes[p / 8] |= vBits[p] << (p % 8);
READWRITE(vBytes);
}
}
/** Construct a partial merkle tree from a list of transaction id's, and a mask that selects a subset of them */
CPartialMerkleTree(const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch);
CPartialMerkleTree();
/**
* extract the matching txid's represented by this partial merkle tree.
* returns the merkle root, or 0 in case of failure
*/
uint256 ExtractMatches(std::vector<uint256> &vMatch);
};
/**
* Used to relay blocks as header + vector<merkle branch>
* to filtered nodes.
*/
class CMerkleBlock
{
public:
/** Public only for unit testing */
CBlockHeader header;
CPartialMerkleTree txn;
public:
/** Public only for unit testing and relay testing (not relayed) */
std::vector<std::pair<unsigned int, uint256> > vMatchedTxn;
/**
* Create from a CBlock, filtering transactions according to filter
* Note that this will call IsRelevantAndUpdate on the filter for each transaction,
* thus the filter will likely be modified.
*/
CMerkleBlock(const CBlock& block, CBloomFilter& filter);
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(header);
READWRITE(txn);
}
};
#endif // BITCOIN_MERKLEBLOCK_H

3
src/primitives/block.h
View file

@ -10,6 +10,9 @@
#include "serialize.h"
#include "uint256.h"
/** The maximum allowed size for a serialized block, in bytes (network rule) */
static const unsigned int MAX_BLOCK_SIZE = 1000000;
/** Nodes collect new transactions into a block, hash them into a hash tree,
* and scan through nonce values to make the block's hash satisfy proof-of-work
* requirements. When they solve the proof-of-work, they broadcast the block

4
src/test/bloom_tests.cpp
View file

@ -7,10 +7,12 @@
#include "base58.h"
#include "clientversion.h"
#include "key.h"
#include "main.h"
#include "merkleblock.h"
#include "serialize.h"
#include "streams.h"
#include "uint256.h"
#include "util.h"
#include "utilstrencodings.h"
#include <vector>

4
src/test/pmt_tests.cpp
View file

@ -2,9 +2,11 @@
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "main.h"
#include "merkleblock.h"
#include "serialize.h"
#include "streams.h"
#include "uint256.h"
#include "version.h"
#include <vector>