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blockchain: factor get_num_outpouts(amount) calls 

It has to stay constant as we get the blockchain lock for the
entire function. Avoids some unnecessary DB accesses.
This commit is contained in:
moneromooo-monero 2015-08-09 18:14:30 +01:00
parent 275894cdef
commit 4f19e68476
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 3 additions and 3 deletions
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6
src/cryptonote_core/blockchain.cpp
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@ -1473,6 +1473,7 @@ bool Blockchain::get_random_outs_for_amounts(const COMMAND_RPC_GET_RANDOM_OUTPUT
// from BlockchainDB where <n> is req.outs_count (number of mixins). // from BlockchainDB where <n> is req.outs_count (number of mixins).
for (uint64_t amount : req.amounts) for (uint64_t amount : req.amounts)
{ {
auto num_outs = m_db->get_num_outputs(amount);
// create outs_for_amount struct and populate amount field // create outs_for_amount struct and populate amount field
COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::outs_for_amount& result_outs = *res.outs.insert(res.outs.end(), COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::outs_for_amount()); COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::outs_for_amount& result_outs = *res.outs.insert(res.outs.end(), COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::outs_for_amount());
result_outs.amount = amount; result_outs.amount = amount;
@ -1481,9 +1482,9 @@ bool Blockchain::get_random_outs_for_amounts(const COMMAND_RPC_GET_RANDOM_OUTPUT
// if there aren't enough outputs to mix with (or just enough), // if there aren't enough outputs to mix with (or just enough),
// use all of them. Eventually this should become impossible. // use all of them. Eventually this should become impossible.
if (m_db->get_num_outputs(amount) <= req.outs_count) if (num_outs <= req.outs_count)
{ {
for (uint64_t i = 0; i < m_db->get_num_outputs(amount); i++) for (uint64_t i = 0; i < num_outs; i++)
{ {
// get tx_hash, tx_out_index from DB // get tx_hash, tx_out_index from DB
tx_out_index toi = m_db->get_output_tx_and_index(amount, i); tx_out_index toi = m_db->get_output_tx_and_index(amount, i);
@ -1499,7 +1500,6 @@ bool Blockchain::get_random_outs_for_amounts(const COMMAND_RPC_GET_RANDOM_OUTPUT
else else
{ {
// while we still need more mixins // while we still need more mixins
auto num_outs = m_db->get_num_outputs(amount);
while (result_outs.outs.size() < req.outs_count) while (result_outs.outs.size() < req.outs_count)
{ {
// if we've gone through every possible output, we've gotten all we can // if we've gone through every possible output, we've gotten all we can