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Remove/ignore tx version in utxo and undo

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This makes the following changes:
* In undo data and the chainstate database, the transaction nVersion
  field is removed from the data structures, always written as 0, and
  ignored when reading.
* The definition of hash_serialized in gettxoutsetinfo is changed to no
  longer incude the nVersion field. It is renamed to hash_serialized_2
  to avoid confusion. The new definition also includes transaction
  height and coinbase information, as this information was missing
  before.

This depends on having a CHashVerifier-based undo data checksum
verifier.

Apart from changing the definition of serialized_hash, downgrading
after using this patch is supported, as no release ever used the value
of nVersion field in UTXO entries.
pull/365/head
Pieter Wuille 8 years ago
parent 7e00322906
commit d342424301
9 changed files with 36 additions and 47 deletions
Show Stats Download Patch File Download Diff File

9
doc/release-notes.md
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@ -36,6 +36,15 @@ Notable changes
Low-level RPC changes
---------------------
- The new database model no longer stores information about transaction
versions of unspent outputs. This means that:
- The `gettxout` RPC no longer has a `version` field in the response.
- The `gettxoutsetinfo` RPC reports `hash_serialized_2` instead of `hash_serialized`,
which does not commit to the transaction versions of unspent outputs, but does
commit to the height and coinbase information.
- The `getutxos` REST path no longer reports the `txvers` field in JSON format,
and always reports 0 for transaction versions in the binary format
- Error codes have been updated to be more accurate for the following error cases:
- `getblock` now returns RPC_MISC_ERROR if the block can't be found on disk (for
example if the block has been pruned). Previously returned RPC_INTERNAL_ERROR.

16
src/coins.h
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@ -84,15 +84,10 @@ public:
//! at which height this transaction was included in the active block chain
int nHeight;
//! version of the CTransaction; accesses to this value should probably check for nHeight as well,
//! as new tx version will probably only be introduced at certain heights
int nVersion;
void FromTx(const CTransaction &tx, int nHeightIn) {
fCoinBase = tx.IsCoinBase();
vout = tx.vout;
nHeight = nHeightIn;
nVersion = tx.nVersion;
ClearUnspendable();
}
@ -105,11 +100,10 @@ public:
fCoinBase = false;
std::vector<CTxOut>().swap(vout);
nHeight = 0;
nVersion = 0;
}
//! empty constructor
CCoins() : fCoinBase(false), vout(0), nHeight(0), nVersion(0) { }
CCoins() : fCoinBase(false), vout(0), nHeight(0) { }
//!remove spent outputs at the end of vout
void Cleanup() {
@ -131,7 +125,6 @@ public:
std::swap(to.fCoinBase, fCoinBase);
to.vout.swap(vout);
std::swap(to.nHeight, nHeight);
std::swap(to.nVersion, nVersion);
}
//! equality test
@ -141,7 +134,6 @@ public:
return true;
return a.fCoinBase == b.fCoinBase &&
a.nHeight == b.nHeight &&
a.nVersion == b.nVersion &&
a.vout == b.vout;
}
friend bool operator!=(const CCoins &a, const CCoins &b) {
@ -163,7 +155,8 @@ public:
assert(fFirst || fSecond || nMaskCode);
unsigned int nCode = 8*(nMaskCode - (fFirst || fSecond ? 0 : 1)) + (fCoinBase ? 1 : 0) + (fFirst ? 2 : 0) + (fSecond ? 4 : 0);
// version
::Serialize(s, VARINT(this->nVersion));
int nVersionDummy = 0;
::Serialize(s, VARINT(nVersionDummy));
// header code
::Serialize(s, VARINT(nCode));
// spentness bitmask
@ -187,7 +180,8 @@ public:
void Unserialize(Stream &s) {
unsigned int nCode = 0;
// version
::Unserialize(s, VARINT(this->nVersion));
int nVersionDummy;
::Unserialize(s, VARINT(nVersionDummy));
// header code
::Unserialize(s, VARINT(nCode));
fCoinBase = nCode & 1;

6
src/rest.cpp
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@ -42,7 +42,6 @@ static const struct {
};
struct CCoin {
uint32_t nTxVer; // Don't call this nVersion, that name has a special meaning inside IMPLEMENT_SERIALIZE
uint32_t nHeight;
CTxOut out;
@ -51,7 +50,8 @@ struct CCoin {
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action)
{
READWRITE(nTxVer);
uint32_t nTxVerDummy = 0;
READWRITE(nTxVerDummy);
READWRITE(nHeight);
READWRITE(out);
}
@ -519,7 +519,6 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
// Safe to index into vout here because IsAvailable checked if it's off the end of the array, or if
// n is valid but points to an already spent output (IsNull).
CCoin coin;
coin.nTxVer = coins.nVersion;
coin.nHeight = coins.nHeight;
coin.out = coins.vout.at(vOutPoints[i].n);
assert(!coin.out.IsNull());
@ -568,7 +567,6 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
UniValue utxos(UniValue::VARR);
BOOST_FOREACH (const CCoin& coin, outs) {
UniValue utxo(UniValue::VOBJ);
utxo.push_back(Pair("txvers", (int32_t)coin.nTxVer));
utxo.push_back(Pair("height", (int32_t)coin.nHeight));
utxo.push_back(Pair("value", ValueFromAmount(coin.out.nValue)));

13
src/rpc/blockchain.cpp
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@ -781,11 +781,10 @@ struct CCoinsStats
uint256 hashBlock;
uint64_t nTransactions;
uint64_t nTransactionOutputs;
uint64_t nSerializedSize;
uint256 hashSerialized;
CAmount nTotalAmount;
CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nSerializedSize(0), nTotalAmount(0) {}
CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nTotalAmount(0) {}
};
//! Calculate statistics about the unspent transaction output set
@ -808,16 +807,17 @@ static bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
if (pcursor->GetKey(key) && pcursor->GetValue(coins)) {
stats.nTransactions++;
ss << key;
ss << VARINT(coins.nHeight * 2 + coins.fCoinBase);
for (unsigned int i=0; i<coins.vout.size(); i++) {
const CTxOut &out = coins.vout[i];
if (!out.IsNull()) {
stats.nTransactionOutputs++;
ss << VARINT(i+1);
ss << out;
ss << *(const CScriptBase*)(&out.scriptPubKey);
ss << VARINT(out.nValue);
nTotalAmount += out.nValue;
}
}
stats.nSerializedSize += 32 + pcursor->GetValueSize();
ss << VARINT(0);
} else {
return error("%s: unable to read value", __func__);
@ -891,7 +891,6 @@ UniValue gettxoutsetinfo(const JSONRPCRequest& request)
" \"bestblock\": \"hex\", (string) the best block hash hex\n"
" \"transactions\": n, (numeric) The number of transactions\n"
" \"txouts\": n, (numeric) The number of output transactions\n"
" \"bytes_serialized\": n, (numeric) The serialized size\n"
" \"hash_serialized\": \"hash\", (string) The serialized hash\n"
" \"total_amount\": x.xxx (numeric) The total amount\n"
"}\n"
@ -909,8 +908,7 @@ UniValue gettxoutsetinfo(const JSONRPCRequest& request)
ret.push_back(Pair("bestblock", stats.hashBlock.GetHex()));
ret.push_back(Pair("transactions", (int64_t)stats.nTransactions));
ret.push_back(Pair("txouts", (int64_t)stats.nTransactionOutputs));
ret.push_back(Pair("bytes_serialized", (int64_t)stats.nSerializedSize));
ret.push_back(Pair("hash_serialized", stats.hashSerialized.GetHex()));
ret.push_back(Pair("hash_serialized_2", stats.hashSerialized.GetHex()));
ret.push_back(Pair("total_amount", ValueFromAmount(stats.nTotalAmount)));
} else {
throw JSONRPCError(RPC_INTERNAL_ERROR, "Unable to read UTXO set");
@ -992,7 +990,6 @@ UniValue gettxout(const JSONRPCRequest& request)
UniValue o(UniValue::VOBJ);
ScriptPubKeyToUniv(coins.vout[n].scriptPubKey, o, true);
ret.push_back(Pair("scriptPubKey", o));
ret.push_back(Pair("version", coins.nVersion));
ret.push_back(Pair("coinbase", coins.fCoinBase));
return ret;

4
src/test/coins_tests.cpp
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@ -142,7 +142,6 @@ BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
} else {
updated_an_entry = true;
}
coins.nVersion = insecure_rand();
coins.vout.resize(1);
coins.vout[0].nValue = insecure_rand();
*entry = coins;
@ -436,7 +435,6 @@ BOOST_AUTO_TEST_CASE(ccoins_serialization)
CDataStream ss1(ParseHex("0104835800816115944e077fe7c803cfa57f29b36bf87c1d358bb85e"), SER_DISK, CLIENT_VERSION);
CCoins cc1;
ss1 >> cc1;
BOOST_CHECK_EQUAL(cc1.nVersion, 1);
BOOST_CHECK_EQUAL(cc1.fCoinBase, false);
BOOST_CHECK_EQUAL(cc1.nHeight, 203998);
BOOST_CHECK_EQUAL(cc1.vout.size(), 2);
@ -449,7 +447,6 @@ BOOST_AUTO_TEST_CASE(ccoins_serialization)
CDataStream ss2(ParseHex("0109044086ef97d5790061b01caab50f1b8e9c50a5057eb43c2d9563a4eebbd123008c988f1a4a4de2161e0f50aac7f17e7f9555caa486af3b"), SER_DISK, CLIENT_VERSION);
CCoins cc2;
ss2 >> cc2;
BOOST_CHECK_EQUAL(cc2.nVersion, 1);
BOOST_CHECK_EQUAL(cc2.fCoinBase, true);
BOOST_CHECK_EQUAL(cc2.nHeight, 120891);
BOOST_CHECK_EQUAL(cc2.vout.size(), 17);
@ -468,7 +465,6 @@ BOOST_AUTO_TEST_CASE(ccoins_serialization)
CDataStream ss3(ParseHex("0002000600"), SER_DISK, CLIENT_VERSION);
CCoins cc3;
ss3 >> cc3;
BOOST_CHECK_EQUAL(cc3.nVersion, 0);
BOOST_CHECK_EQUAL(cc3.fCoinBase, false);
BOOST_CHECK_EQUAL(cc3.nHeight, 0);
BOOST_CHECK_EQUAL(cc3.vout.size(), 1);

1
src/test/transaction_tests.cpp
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@ -471,7 +471,6 @@ BOOST_AUTO_TEST_CASE(test_big_witness_transaction) {
threadGroup.create_thread(boost::bind(&CCheckQueue<CScriptCheck>::Thread, boost::ref(scriptcheckqueue)));
CCoins coins;
coins.nVersion = 1;
coins.fCoinBase = false;
for(uint32_t i = 0; i < mtx.vin.size(); i++) {
CTxOut txout;

20
src/undo.h
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@ -14,7 +14,8 @@
*
* Contains the prevout's CTxOut being spent, and if this was the
* last output of the affected transaction, its metadata as well
* (coinbase or not, height, transaction version)
* (coinbase or not, height). Earlier versions also stored the transaction
* version.
*/
class CTxInUndo
{
@ -22,16 +23,17 @@ public:
CTxOut txout; // the txout data before being spent
bool fCoinBase; // if the outpoint was the last unspent: whether it belonged to a coinbase
unsigned int nHeight; // if the outpoint was the last unspent: its height
int nVersion; // if the outpoint was the last unspent: its version
CTxInUndo() : txout(), fCoinBase(false), nHeight(0), nVersion(0) {}
CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0, int nVersionIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn), nVersion(nVersionIn) { }
CTxInUndo() : txout(), fCoinBase(false), nHeight(0) {}
CTxInUndo(const CTxOut &txoutIn, bool fCoinBaseIn = false, unsigned int nHeightIn = 0) : txout(txoutIn), fCoinBase(fCoinBaseIn), nHeight(nHeightIn) { }
template<typename Stream>
void Serialize(Stream &s) const {
::Serialize(s, VARINT(nHeight*2+(fCoinBase ? 1 : 0)));
if (nHeight > 0)
::Serialize(s, VARINT(this->nVersion));
if (nHeight > 0) {
int nVersionDummy = 0;
::Serialize(s, VARINT(nVersionDummy));
}
::Serialize(s, CTxOutCompressor(REF(txout)));
}
@ -41,8 +43,10 @@ public:
::Unserialize(s, VARINT(nCode));
nHeight = nCode / 2;
fCoinBase = nCode & 1;
if (nHeight > 0)
::Unserialize(s, VARINT(this->nVersion));
if (nHeight > 0) {
int nVersionDummy;
::Unserialize(s, VARINT(nVersionDummy));
}
::Unserialize(s, REF(CTxOutCompressor(REF(txout))));
}
};

7
src/validation.cpp
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@ -1086,7 +1086,6 @@ void UpdateCoins(const CTransaction& tx, CCoinsViewCache& inputs, CTxUndo &txund
CTxInUndo& undo = txundo.vprevout.back();
undo.nHeight = coins->nHeight;
undo.fCoinBase = coins->fCoinBase;
undo.nVersion = coins->nVersion;
}
}
}
@ -1271,7 +1270,6 @@ int ApplyTxInUndo(const CTxInUndo& undo, CCoinsViewCache& view, const COutPoint&
if (!coins->IsPruned()) fClean = false; // overwriting existing transaction
coins->fCoinBase = undo.fCoinBase;
coins->nHeight = undo.nHeight;
coins->nVersion = undo.nVersion;
} else {
if (coins->IsPruned()) fClean = false; // adding output to missing transaction
}
@ -1319,11 +1317,6 @@ static DisconnectResult DisconnectBlock(const CBlock& block, const CBlockIndex*
outs->ClearUnspendable();
CCoins outsBlock(tx, pindex->nHeight);
// The CCoins serialization does not serialize negative numbers.
// No network rules currently depend on the version here, so an inconsistency is harmless
// but it must be corrected before txout nversion ever influences a network rule.
if (outsBlock.nVersion < 0)
outs->nVersion = outsBlock.nVersion;
if (*outs != outsBlock) fClean = false; // transaction mismatch
// remove outputs

7
test/functional/blockchain.py
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@ -49,10 +49,9 @@ class BlockchainTest(BitcoinTestFramework):
assert_equal(res['transactions'], 200)
assert_equal(res['height'], 200)
assert_equal(res['txouts'], 200)
assert_equal(res['bytes_serialized'], 13924),
assert_equal(res['bestblock'], node.getblockhash(200))
assert_equal(len(res['bestblock']), 64)
assert_equal(len(res['hash_serialized']), 64)
assert_equal(len(res['hash_serialized_2']), 64)
self.log.info("Test that gettxoutsetinfo() works for blockchain with just the genesis block")
b1hash = node.getblockhash(1)
@ -64,7 +63,7 @@ class BlockchainTest(BitcoinTestFramework):
assert_equal(res2['height'], 0)
assert_equal(res2['txouts'], 0)
assert_equal(res2['bestblock'], node.getblockhash(0))
assert_equal(len(res2['hash_serialized']), 64)
assert_equal(len(res2['hash_serialized_2']), 64)
self.log.info("Test that gettxoutsetinfo() returns the same result after invalidate/reconsider block")
node.reconsiderblock(b1hash)
@ -75,7 +74,7 @@ class BlockchainTest(BitcoinTestFramework):
assert_equal(res['height'], res3['height'])
assert_equal(res['txouts'], res3['txouts'])
assert_equal(res['bestblock'], res3['bestblock'])
assert_equal(res['hash_serialized'], res3['hash_serialized'])
assert_equal(res['hash_serialized_2'], res3['hash_serialized_2'])
def _test_getblockheader(self):
node = self.nodes[0]

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