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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.
This commit is contained in:
Pieter Wuille
2017-04-25 11:29:18 -07:00
parent 7e00322906
commit d342424301
9 changed files with 36 additions and 47 deletions
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7
src/validation.cpp
View File

@@ -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