function BWWC__generate_new_bitcoin_address_for_electrum_wallet($bwwc_settings = false, $electrum_mpk = false)
{
global $wpdb;
$btc_addresses_table_name = $wpdb->prefix . 'bwwc_btc_addresses';
if (!$bwwc_settings) {
$bwwc_settings = BWWC__get_settings();
}
if (!$electrum_mpk) {
// Try to retrieve it from copy of settings.
$electrum_mpk = @$bwwc_settings['gateway_settings']['electrum_master_public_key'];
if (!$electrum_mpk || @$bwwc_settings['gateway_settings']['service_provider'] != 'electrum-wallet') {
// Bitcoin gateway settings either were not saved
$ret_info_array = array('result' => 'error', 'message' => 'No MPK passed and either no MPK present in copy-settings or service provider is not Electrum', 'host_reply_raw' => '', 'generated_bitcoin_address' => false);
return $ret_info_array;
}
}
$origin_id = 'electrum.mpk.' . md5($electrum_mpk);
$funds_received_value_expires_in_secs = $bwwc_settings['funds_received_value_expires_in_mins'] * 60;
$assigned_address_expires_in_secs = $bwwc_settings['assigned_address_expires_in_mins'] * 60;
$clean_address = false;
// Find next index to generate
$next_key_index = $wpdb->get_var("SELECT MAX(`index_in_wallet`) AS `max_index_in_wallet` FROM `{$btc_addresses_table_name}` WHERE `origin_id`='{$origin_id}';");
if ($next_key_index === NULL) {
$next_key_index = $bwwc_settings['starting_index_for_new_btc_addresses'];
} else {
$next_key_index = $next_key_index + 1;
}
// Continue with next index
$total_new_keys_generated = 0;
$blockchains_api_failures = 0;
do {
$new_btc_address = BWWC__MATH_generate_bitcoin_address_from_mpk($electrum_mpk, $next_key_index);
$ret_info_array = BWWC__getreceivedbyaddress_info($new_btc_address, 0, $bwwc_settings['blockchain_api_timeout_secs']);
$total_new_keys_generated++;
if ($ret_info_array['balance'] === false) {
$status = 'unknown';
} else {
if ($ret_info_array['balance'] == 0) {
$status = 'unused';
} else {
$status = 'used';
}
}
// Generated address that was already used to receive money.
$funds_received = $ret_info_array['balance'] === false ? -1 : $ret_info_array['balance'];
$received_funds_checked_at_time = $ret_info_array['balance'] === false ? 0 : time();
// Insert newly generated address into DB
$query = "INSERT INTO `{$btc_addresses_table_name}`\r\n (`btc_address`, `origin_id`, `index_in_wallet`, `total_received_funds`, `received_funds_checked_at`, `status`) VALUES\r\n ('{$new_btc_address}', '{$origin_id}', '{$next_key_index}', '{$funds_received}', '{$received_funds_checked_at_time}', '{$status}');";
$ret_code = $wpdb->query($query);
$next_key_index++;
if ($ret_info_array['balance'] === false) {
$blockchains_api_failures++;
if ($blockchains_api_failures >= $bwwc_settings['max_blockchains_api_failures']) {
// Allow no more than 3 contigious blockchains API failures. After which return error reply.
$ret_info_array = array('result' => 'error', 'message' => $ret_info_array['message'], 'host_reply_raw' => $ret_info_array['host_reply_raw'], 'generated_bitcoin_address' => false);
return $ret_info_array;
}
} else {
if ($ret_info_array['balance'] == 0) {
// Update DB with balance and timestamp, mark address as 'assigned' and return this address as clean.
$clean_address = $new_btc_address;
}
}
if ($clean_address) {
break;
}
if ($total_new_keys_generated >= $bwwc_settings['max_unusable_generated_addresses']) {
// Stop it after generating of 20 unproductive addresses.
// Something is wrong. Possibly old merchant's wallet (with many used addresses) is used for new installation. - For this case 'starting_index_for_new_btc_addresses'
// needs to be proper set to high value.
$ret_info_array = array('result' => 'error', 'message' => "Problem: Generated '{$total_new_keys_generated}' addresses and none were found to be unused. Possibly old merchant's wallet (with many used addresses) is used for new installation. If that is the case - 'starting_index_for_new_btc_addresses' needs to be proper set to high value", 'host_reply_raw' => '', 'generated_bitcoin_address' => false);
return $ret_info_array;
}
} while (true);
// Here only in case of clean address.
$ret_info_array = array('result' => 'success', 'message' => '', 'host_reply_raw' => '', 'generated_bitcoin_address' => $clean_address);
return $ret_info_array;
}
function BWWC_cron_job_worker($hardcron = false)
{
global $wpdb;
$bwwc_settings = BWWC__get_settings();
if (@$bwwc_settings['gateway_settings']['service_provider'] != 'electrum-wallet') {
return;
// Only active electrum wallet as a service provider needs cron job
}
// status = "unused", "assigned", "used"
$btc_addresses_table_name = $wpdb->prefix . 'bwwc_btc_addresses';
$funds_received_value_expires_in_secs = $bwwc_settings['funds_received_value_expires_in_mins'] * 60;
$assigned_address_expires_in_secs = $bwwc_settings['assigned_address_expires_in_mins'] * 60;
$confirmations_required = $bwwc_settings['gateway_settings']['confirmations'];
$clean_address = NULL;
$current_time = time();
// Search for completed orders (addresses that received full payments for their orders) ...
// NULL == not found
// Retrieve:
// 'assigned' - unexpired, with old balances (due for revalidation. Fresh balances and still 'assigned' means no [full] payment received yet)
// 'revalidate' - all
// order results by most recently assigned
$query = "SELECT * FROM `{$btc_addresses_table_name}`\n WHERE\n (\n (`status`='assigned' AND (('{$current_time}' - `assigned_at`) < '{$assigned_address_expires_in_secs}'))\n OR\n (`status`='revalidate')\n )\n AND (('{$current_time}' - `received_funds_checked_at`) > '{$funds_received_value_expires_in_secs}')\n ORDER BY `received_funds_checked_at` ASC;";
// Check the ones that haven't been checked for longest time
$rows_for_balance_check = $wpdb->get_results($query, ARRAY_A);
if (is_array($rows_for_balance_check)) {
$count_rows_for_balance_check = count($rows_for_balance_check);
} else {
$count_rows_for_balance_check = 0;
}
if (is_array($rows_for_balance_check)) {
$ran_cycles = 0;
foreach ($rows_for_balance_check as $row_for_balance_check) {
$ran_cycles++;
// To limit number of cycles per soft cron job.
// Prepare 'address_meta' for use.
$address_meta = BWWC_unserialize_address_meta(@$row_for_balance_check['address_meta']);
$last_order_info = @$address_meta['orders'][0];
$row_id = $row_for_balance_check['id'];
// Retrieve current balance at address.
$balance_info_array = BWWC__getreceivedbyaddress_info($row_for_balance_check['btc_address'], $confirmations_required, $bwwc_settings['blockchain_api_timeout_secs']);
if ($balance_info_array['result'] == 'success') {
/*
$balance_info_array = array (
'result' => 'success',
'message' => "",
'host_reply_raw' => "",
'balance' => $funds_received,
);
*/
// Refresh 'received_funds_checked_at' field
$current_time = time();
$query = "UPDATE `{$btc_addresses_table_name}`\n SET\n `total_received_funds` = '{$balance_info_array['balance']}',\n `received_funds_checked_at`='{$current_time}'\n WHERE `id`='{$row_id}';";
$ret_code = $wpdb->query($query);
if ($balance_info_array['balance'] > 0) {
if ($row_for_balance_check['status'] == 'revalidate') {
// Address with suddenly appeared balance. Check if that is matching to previously-placed [likely expired] order
if (!$last_order_info || !@$last_order_info['order_id'] || !@$balance_info_array['balance'] || !@$last_order_info['order_total']) {
// No proper metadata present. Mark this address as 'xused' (used by unknown entity outside of this application) and be done with it forever.
$query = "UPDATE `{$btc_addresses_table_name}`\n SET\n `status` = 'xused'\n WHERE `id`='{$row_id}';";
$ret_code = $wpdb->query($query);
continue;
} else {
// Metadata for this address is present. Mark this address as 'assigned' and treat it like that further down...
$query = "UPDATE `{$btc_addresses_table_name}`\n SET\n `status` = 'assigned'\n WHERE `id`='{$row_id}';";
$ret_code = $wpdb->query($query);
}
}
BWWC__log_event(__FILE__, __LINE__, "Cron job: NOTE: Detected non-zero balance at address: '{$row_for_balance_check['btc_address']}, order ID = '{$last_order_info['order_id']}'. Detected balance ='{$balance_info_array['balance']}'.");
if ($balance_info_array['balance'] < $last_order_info['order_total']) {
BWWC__log_event(__FILE__, __LINE__, "Cron job: NOTE: balance at address: '{$row_for_balance_check['btc_address']}' (BTC '{$balance_info_array['balance']}') is not yet sufficient to complete it's order (order ID = '{$last_order_info['order_id']}'). Total required: '{$last_order_info['order_total']}'. Will wait for more funds to arrive...");
}
} else {
}
// Note: to be perfectly safe against late-paid orders, we need to:
// Scan '$address_meta['orders']' for first UNPAID order that is exactly matching amount at address.
if ($balance_info_array['balance'] >= $last_order_info['order_total']) {
// Process full payment event
/*
$address_meta =
array (
'orders' =>
array (
// All orders placed on this address in reverse chronological order
array (
'order_id' => $order_id,
'order_total' => $order_total_in_btc,
'order_datetime' => date('Y-m-d H:i:s T'),
'requested_by_ip' => @$_SERVER['REMOTE_ADDR'],
),
array (
...
),
),
'other_meta_info' => array (...)
);
*/
// Last order was fully paid! Complete it...
BWWC__log_event(__FILE__, __LINE__, "Cron job: NOTE: Full payment for order ID '{$last_order_info['order_id']}' detected at address: '{$row_for_balance_check['btc_address']}' (BTC '{$balance_info_array['balance']}'). Total was required for this order: '{$last_order_info['order_total']}'. Processing order ...");
// Update order' meta info
$address_meta['orders'][0]['paid'] = true;
// Process and complete the order within WooCommerce (send confirmation emails, etc...)
BWWC__process_payment_completed_for_order($last_order_info['order_id'], $balance_info_array['balance']);
// Update address' record
$address_meta_serialized = BWWC_serialize_address_meta($address_meta);
// Update DB - mark address as 'used'.
//
$current_time = time();
// Note: `total_received_funds` and `received_funds_checked_at` are already updated above.
//
$query = "UPDATE `{$btc_addresses_table_name}`\n\t SET\n\t `status`='used',\n\t `address_meta`='{$address_meta_serialized}'\n\t WHERE `id`='{$row_id}';";
$ret_code = $wpdb->query($query);
BWWC__log_event(__FILE__, __LINE__, "Cron job: SUCCESS: Order ID '{$last_order_info['order_id']}' successfully completed.");
// This is not needed here. Let it process as many orders as are paid for in the same loop.
// Maybe to be moved there --> //..// (to avoid soft-cron checking of balance of hundreds of addresses in a same loop)
//
// // Return here to avoid overloading too many processing needs to one random visitor.
// // Then it means no more than one order can be processed per 2.5 minutes (or whatever soft cron schedule is).
// // Hard cron is immune to this limitation.
// if (!$hardcron && $ran_cycles >= $bwwc_settings['soft_cron_max_loops_per_run'])
// {
// return;
// }
}
} else {
BWWC__log_event(__FILE__, __LINE__, "Cron job: Warning: Cannot retrieve balance for address: '{$row_for_balance_check['btc_address']}: " . $balance_info_array['message']);
}
//..//
}
}
// Process all 'revalidate' addresses here.
// ...
//-----------------------------------------------------
// Pre-generate new bitcoin address for electrum wallet
// Try to retrieve mpk from copy of settings.
if ($hardcron) {
$electrum_mpk = @$bwwc_settings['gateway_settings']['electrum_master_public_key'];
if ($electrum_mpk && @$bwwc_settings['gateway_settings']['service_provider'] == 'electrum-wallet') {
// Calculate number of unused addresses belonging to currently active electrum wallet
$origin_id = 'electrum.mpk.' . md5($electrum_mpk);
$current_time = time();
$assigned_address_expires_in_secs = $bwwc_settings['assigned_address_expires_in_mins'] * 60;
if ($bwwc_settings['reuse_expired_addresses']) {
$reuse_expired_addresses_query_part = "OR (`status`='assigned' AND (('{$current_time}' - `assigned_at`) > '{$assigned_address_expires_in_secs}'))";
} else {
$reuse_expired_addresses_query_part = "";
}
// Calculate total number of currently unused addresses in a system. Make sure there aren't too many.
// NULL == not found
// Retrieve:
// 'unused' - with fresh zero balances
// 'assigned' - expired, with fresh zero balances (if 'reuse_expired_addresses' is true)
//
// Hence - any returned address will be clean to use.
$query = "SELECT COUNT(*) as `total_unused_addresses` FROM `{$btc_addresses_table_name}`\n WHERE `origin_id`='{$origin_id}'\n AND `total_received_funds`='0'\n AND (`status`='unused' {$reuse_expired_addresses_query_part})\n ";
$total_unused_addresses = $wpdb->get_var($query);
if ($total_unused_addresses < $bwwc_settings['max_unused_addresses_buffer']) {
BWWC__generate_new_bitcoin_address_for_electrum_wallet($bwwc_settings, $electrum_mpk);
}
}
}
//-----------------------------------------------------
}
