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BlockchainBDB: Remove tx outputs in reverse order

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Data should be removed in the reverse order it was added.

This matches the order of removal in
blockchain_storage::pop_transaction_from_global_index.

See f11def012f
This commit is contained in:
warptangent 2016-01-28 17:44:56 -08:00
parent 60b064c759
commit 1a5c3fa729
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GPG Key ID: 0E490BEBFBE4E92D
1 changed files with 14 additions and 4 deletions
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18
src/blockchain_db/berkeleydb/db_bdb.cpp
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@ -419,16 +419,26 @@ void BlockchainBDB::remove_tx_outputs(const crypto::hash& tx_hash, const transac
} }
else else
{ {
result = cur->get(&k, &v, DB_NEXT_NODUP);
if (result != 0 && result != DB_NOTFOUND)
throw0(DB_ERROR("DB error attempting to get next non-duplicate tx hash"));
if (result == 0)
result = cur->get(&k, &v, DB_PREV);
else if (result == DB_NOTFOUND)
result = cur->get(&k, &v, DB_LAST);
db_recno_t num_elems = 0; db_recno_t num_elems = 0;
cur->count(&num_elems, 0); cur->count(&num_elems, 0);
for (uint64_t i = 0; i < num_elems; ++i) // remove in order: from newest to oldest
for (uint64_t i = num_elems; i > 0; --i)
{ {
const tx_out tx_output = tx.vout[i]; const tx_out tx_output = tx.vout[i-1];
remove_output(v, tx_output.amount); remove_output(v, tx_output.amount);
if (i < num_elems - 1) if (i > 1)
{ {
cur->get(&k, &v, DB_NEXT_DUP); cur->get(&k, &v, DB_PREV_DUP);
} }
} }
} }