void unspent_outputs::remove(const output_point& point)
{
if (capacity_ == 0)
return;
const unspent_transaction key{ point };
// Critical Section
///////////////////////////////////////////////////////////////////////////
mutex_.lock_upgrade();
// Find the unspent tx entry that may contain the output.
auto tx = unspent_.left.find(key);
if (tx == unspent_.left.end())
{
mutex_.unlock_upgrade();
//---------------------------------------------------------------------
return;
}
const auto outputs = tx->first.outputs();
mutex_.unlock_upgrade_and_lock();
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Erase the output if found at the specified index for the found tx.
outputs->erase(point.index());
// Erase the unspent transaction if it is now fully spent.
if (outputs->empty())
unspent_.left.erase(tx);
mutex_.unlock();
///////////////////////////////////////////////////////////////////////////
}
bool unspent_outputs::get(output& out_output, size_t& out_height,
bool& out_coinbase, const output_point& point, size_t fork_height) const
{
if (capacity_ == 0)
return false;
++queries_;
const unspent_transaction key{ point };
// Critical Section
///////////////////////////////////////////////////////////////////////////
shared_lock lock(mutex_);
// Find the unspent tx entry.
const auto tx = unspent_.left.find(key);
if (tx == unspent_.left.end())
return false;
// Find the output at the specified index for the found unspent tx.
const auto outputs = tx->first.outputs();
const auto output = outputs->find(point.index());
if (output == outputs->end())
return false;
// Determine if the cached unspent tx is above specified fork_height.
// Since the hash table does not allow duplicates there are no others.
const auto& unspent = tx->first;
const auto height = tx->first.height();
if (height > fork_height)
return false;
++hits_;
out_height = height;
out_coinbase = unspent.is_coinbase();
out_output = output->second;
return true;
///////////////////////////////////////////////////////////////////////////
}
// All responses are unspent, metadata should be defaulted by caller.
bool unspent_outputs::populate(const output_point& point,
size_t fork_height) const
{
if (disabled())
return false;
++queries_;
auto& prevout = point.metadata;
const unspent_transaction key{ point };
// Critical Section
///////////////////////////////////////////////////////////////////////////
shared_lock lock(mutex_);
// Find the unspent tx entry.
const auto tx = unspent_.left.find(key);
if (tx == unspent_.left.end())
return false;
// Find the output at the specified index for the found unspent tx.
const auto& transaction = tx->first;
const auto outputs = transaction.outputs();
const auto output = outputs->find(point.index());
if (output == outputs->end())
return false;
++hits_;
const auto height = transaction.height();
// Populate the output metadata.
prevout.spent = false;
prevout.candidate = false;
prevout.confirmed = transaction.is_confirmed() && height <= fork_height;
prevout.coinbase = transaction.is_coinbase();
prevout.height = height;
prevout.median_time_past = transaction.median_time_past();
prevout.cache = output->second;
return true;
///////////////////////////////////////////////////////////////////////////
}
