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core: faster find_blockchain_supplement

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Since this queries block heights for blocks that may or may not
exist, queries for non existing blocks would throw an exception,
and that would slow down the loop a lot. 7 seconds to go through
a 30 hash list.

Fix this by adding an optional return block height to block_exists
and using this instead. Actual errors will still throw an
exception.

This also cuts down on log exception spam.
This commit is contained in:
moneromooo-monero 2016-08-30 16:39:33 +01:00
parent c3ba844f03
commit 6cf8ca2a7f
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7 changed files with 19 additions and 12 deletions
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9
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -1387,7 +1387,7 @@ void BlockchainLMDB::unlock()
auto_txn.commit(); \
} while(0)
bool BlockchainLMDB::block_exists(const crypto::hash& h) const
bool BlockchainLMDB::block_exists(const crypto::hash& h, uint64_t *height) const
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open();
@ -1405,7 +1405,14 @@ bool BlockchainLMDB::block_exists(const crypto::hash& h) const
else if (get_result)
throw0(DB_ERROR(lmdb_error("DB error attempting to fetch block index from hash", get_result).c_str()));
else
{
if (height)
{
const blk_height *bhp = (const blk_height *)key.mv_data;
*height = bhp->bh_height;
}
ret = true;
}
TXN_POSTFIX_RDONLY();
return ret;