bool validate_transaction::connect_input(const transaction& tx, size_t current_input, const transaction& previous_tx, size_t parent_height, size_t last_block_height, uint64_t& value_in) { const auto& input = tx.inputs[current_input]; const auto& previous_outpoint = tx.inputs[current_input].previous_output; if (previous_outpoint.index >= previous_tx.outputs.size()) return false; const auto& previous_output = previous_tx.outputs[previous_outpoint.index]; const auto output_value = previous_output.value; if (output_value > max_money()) return false; if (previous_tx.is_coinbase()) { const auto height_difference = last_block_height - parent_height; if (height_difference < coinbase_maturity) return false; } if (!check_consensus(previous_output.script, tx, current_input)) return false; value_in += output_value; return value_in <= max_money(); }
void unspent_outputs::add(const transaction& tx, size_t height, uint32_t median_time_past, bool confirmed) { if (disabled() || tx.outputs().empty()) return; if (tx.is_coinbase()) { LOG_DEBUG(LOG_DATABASE) << "Output cache hit rate: " << hit_rate() << ", size: " << size(); } // Critical Section /////////////////////////////////////////////////////////////////////////// unique_lock lock(mutex_); // It's been a long time since the last restart (~16 years). if (sequence_ == max_uint32) unspent_.clear(); // Remove the oldest entry if the buffer is at capacity. if (unspent_.size() >= capacity_) unspent_.right.erase(unspent_.right.begin()); // TODO: promote the unconfirmed tx cache instead of replacing it. // A confirmed tx may replace the same unconfirmed tx here. unspent_.insert( { unspent_transaction{ tx, height, median_time_past, confirmed }, ++sequence_ }); /////////////////////////////////////////////////////////////////////////// }
code validate_transaction::check_transaction(const transaction& tx) { if (tx.inputs.empty() || tx.outputs.empty()) return error::empty_transaction; if (tx.serialized_size() > max_transaction_size) return error::size_limits; // Check for negative or overflow output values uint64_t total_output_value = 0; for (const auto& output: tx.outputs) { if (output.value > max_money()) return error::output_value_overflow; total_output_value += output.value; if (total_output_value > max_money()) return error::output_value_overflow; } if (tx.is_coinbase()) { const auto& coinbase_script = tx.inputs[0].script; const auto coinbase_size = coinbase_script.serialized_size(false); if (coinbase_size < 2 || coinbase_size > 100) return error::invalid_coinbase_script_size; } else { for (const auto& input: tx.inputs) if (input.previous_output.is_null()) return error::previous_output_null; } return error::success; }