function testBalanceLookupElegantlyHandlesUnhelpfulResponsesFromBlockchainDotInfo()
{
$addresses = array('1GivesBlankContentiTDhViXbrogKqzbt', '1GivesLockWaitTimeoutTDhViXbrogKqzbt');
foreach ($addresses as $a) {
try {
BlockchainDotInfo\getBalanceInSatoshis($a);
fail("Expected to get exception for lookup on address {$a}");
} catch (NetworkError $e) {
}
}
}
function testGetBalanceUsesLocallyCachedValueWhenAppropriate()
{
$address = '1K7dyLY6arFRXBidQhrtnyqksqJZdj2F37';
$actualBalance = BlockchainDotInfo\getBalanceInSatoshis($address);
$cachedBalance = $actualBalance + 1000;
DB\delete('bitcoin_addresses', 'address = ?', array($address));
DB\insertOne('bitcoin_addresses', array('address' => $address, 'satoshis' => $cachedBalance, 'updated_at' => new DateTime('now')));
$balance = Bitcoin\getBalance($address, null);
assertEqual($cachedBalance, $balance->numSatoshis);
assertEqual($cachedBalance / Bitcoin\satoshisPerBTC(), $balance->numBTC);
}
function getBalance($address, \DateInterval $maxCacheAge = null)
{
if (empty($address) || trim($address) == '') {
throw new InvalidAddress("Empty string/value is not valid");
}
$satoshis = null;
$updatedAt = null;
$needsUpdated = false;
try {
$row = DB\selectExactlyOne('bitcoin_addresses', 'address = ?', array($address));
$satoshis = intval($row['satoshis']);
if ($maxCacheAge) {
$updatedAt = new DateTime($row['updated_at']);
$expiresAt = $updatedAt->add($maxCacheAge);
$now = new DateTime('now');
if ($expiresAt->getTimestamp() < $now->getTimestamp()) {
$needsUpdated = true;
}
}
} catch (DB\NoMatchingRecords $_) {
$needsUpdated = true;
}
if ($needsUpdated) {
# Since we don't want to have two or three (or more) processes all trying to query
# Blockchain.info at the same time, we use a lock to assure only one attempt is made
# to update the cache.
$lockObtained = withLock($address, function () use($address) {
$satoshis = BlockchainDotInfo\getBalanceInSatoshis($address);
cacheBalance($address, $satoshis);
});
if (!$lockObtained) {
if ($satoshis === null) {
Log\error("Failed to obtain lock for and no cached balance exists for Bitcoin address " . "{$address}; defaulting to zero");
}
$oneHourAgo = new DateTime('1 hour ago');
if ($updatedAt && $updatedAt->getTimestamp() < $oneHourAgo->getTimestamp()) {
Log\error("Balance for Bitcoin address {$address} has not been updated for " . "more than one hour");
}
}
}
// $btcBalance = $satoshis / satoshisPerBTC();
// $balanceWithPrecision = $currency == 'BTC' ? $btcBalance : fromBTC($btcBalance, $currency);
// return $balanceWithPrecision;
return new AmountOfBitcoin($satoshis);
}