/**
* Connects the socket by iterating through all the servers in the pool
* and trying to find one that:
* 1. is not marked down after consecutive failures
* 2. can really be connected to
*
* @return bool false: any IP in the pool failed to connect before returning
* true: no failures
*/
public function open()
{
// Check if we want order randomization
if ($this->randomize_) {
// warning: don't use shuffle here because it leads to uneven
// load distribution
$n = count($this->servers_);
$s = $this->servers_;
for ($i = 1; $i < $n; $i++) {
$j = mt_rand(0, $i);
$tmp = $s[$i];
$s[$i] = $s[$j];
$s[$j] = $tmp;
}
$this->servers_ = $s;
}
// Count servers to identify the "last" one
$numServers = count($this->servers_);
$has_conn_errors = false;
$fail_reason = array();
// reasons of conn failures
for ($i = 0; $i < $numServers; ++$i) {
// host port is stored as an array
list($host, $port) = $this->servers_[$i];
$failtimeKey = TSocketPool::getAPCFailtimeKey($host, $port);
// Cache miss? Assume it's OK
$lastFailtime = $this->apcFetch($failtimeKey);
$this->apcLog("TSocketPool: host {$host}:{$port} last fail time: " . $lastFailtime);
if ($lastFailtime === FALSE) {
$lastFailtime = 0;
}
$retryIntervalPassed = FALSE;
// Cache hit...make sure enough the retry interval has elapsed
if ($lastFailtime > 0) {
$elapsed = time() - $lastFailtime;
if ($elapsed > $this->retryInterval_) {
$retryIntervalPassed = TRUE;
if ($this->debug_) {
call_user_func($this->debugHandler_, 'TSocketPool: retryInterval ' . '(' . $this->retryInterval_ . ') ' . 'has passed for host ' . $host . ':' . $port);
}
}
}
// Only connect if not in the middle of a fail interval, OR if this
// is the LAST server we are trying, just hammer away on it
$isLastServer = FALSE;
if ($this->alwaysTryLast_) {
$isLastServer = $i == $numServers - 1;
}
if ($lastFailtime === 0 || $isLastServer || $lastFailtime > 0 && $retryIntervalPassed) {
// Set underlying TSocket params to this one
// fsockopen requires IPv6 addresses be bracet enclosed
$this->host_ = $host;
$this->port_ = $port;
// Try up to numRetries_ connections per server
for ($attempt = 0; $attempt < $this->numRetries_; $attempt++) {
try {
// Use the underlying TSocket open function
parent::open();
// Only clear the failure counts if required to do so
if ($lastFailtime > 0) {
$this->apcStore($failtimeKey, 0);
}
// Successful connection, return now
return !$has_conn_errors;
} catch (TException $tx) {
// Connection failed
// keep the reason for the last try
$errstr = $this->getErrStr();
$errno = $this->getErrNo();
if ($errstr !== null || $errno !== null) {
$fail_reason[$i] = '(' . $errstr . '[' . $errno . '])';
} else {
$fail_reason[$i] = '(?)';
}
}
}
// For transient errors (like Resource temporarily unavailable),
// we might want not to cache the failure.
if ($this->alwaysRetryForTransientFailure_ && $this->isTransientConnectFailure($this->getErrNo())) {
continue;
}
$has_conn_errors = $this->recordFailure($host, $port, $this->maxConsecutiveFailures_, $this->retryInterval_, $this->debug_ ? $this->debugHandler_ : null);
} else {
$fail_reason[$i] = '(cached-down)';
}
}
// Holy shit we failed them all. The system is totally ill!
$error = 'TSocketPool: All hosts in pool are down. ';
$hosts = array();
foreach ($this->servers_ as $i => $server) {
// array(host, port) (reasons, if exist)
list($host, $port) = $server;
if (ip_is_valid($host)) {
$host = IPAddress($host)->forURL();
}
$h = $host . ':' . $port;
if (isset($fail_reason[$i])) {
$h .= $fail_reason[$i];
}
$hosts[] = $h;
}
$hostlist = implode(',', $hosts);
$error .= '(' . $hostlist . ')';
if ($this->debug_) {
call_user_func($this->debugHandler_, $error);
}
throw new TTransportException($error);
}
public function open()
{
if (\hacklib_cast_as_boolean($this->randomize_)) {
$n = count($this->servers_);
$s = $this->servers_;
for ($i = 1; $i < $n; $i++) {
$j = mt_rand(0, $i);
$tmp = $s[$i];
$s[$i] = $s[$j];
$s[$j] = $tmp;
}
$this->servers_ = $s;
}
$numServers = count($this->servers_);
$has_conn_errors = false;
$fail_reason = array();
for ($i = 0; $i < $numServers; ++$i) {
list($host, $port) = $this->servers_[$i];
$failtimeKey = TSocketPool::getAPCFailtimeKey($host, $port);
$lastFailtime = (int) $this->apcFetch($failtimeKey);
$this->apcLog("TSocketPool: host {$host}:{$port} last fail time: " . $lastFailtime);
$retryIntervalPassed = false;
if ($lastFailtime > 0) {
$elapsed = time() - $lastFailtime;
if ($elapsed > $this->retryInterval_) {
$retryIntervalPassed = true;
if (\hacklib_cast_as_boolean($this->debug_) && $this->debugHandler_ !== null) {
$dh = $this->debugHandler_;
$dh('TSocketPool: retryInterval ' . '(' . $this->retryInterval_ . ') ' . 'has passed for host ' . $host . ':' . $port);
}
}
}
$isLastServer = false;
if (\hacklib_cast_as_boolean($this->alwaysTryLast_)) {
$isLastServer = \hacklib_equals($i, $numServers - 1);
}
if ($lastFailtime === 0 || \hacklib_cast_as_boolean($isLastServer) || $lastFailtime > 0 && \hacklib_cast_as_boolean($retryIntervalPassed)) {
$this->host_ = $host;
$this->port_ = $port;
for ($attempt = 0; $attempt < $this->numRetries_; $attempt++) {
try {
parent::open();
if ($lastFailtime > 0) {
$this->apcStore($failtimeKey, 0);
}
return;
} catch (TException $tx) {
$errstr = $this->getErrStr();
$errno = $this->getErrNo();
if ($errstr !== null || $errno !== null) {
$fail_reason[$i] = '(' . $errstr . '[' . $errno . '])';
} else {
$fail_reason[$i] = '(?)';
}
}
}
if (\hacklib_cast_as_boolean($this->alwaysRetryForTransientFailure_) && \hacklib_cast_as_boolean($this->isTransientConnectFailure($this->getErrNo()))) {
continue;
}
$dh = \hacklib_cast_as_boolean($this->debug_) ? $this->debugHandler_ : null;
$has_conn_errors = $this->recordFailure($host, $port, $this->maxConsecutiveFailures_, $this->retryInterval_, $dh);
} else {
$fail_reason[$i] = '(cached-down)';
}
}
$error = 'TSocketPool: All hosts in pool are down. ';
$hosts = array();
foreach ($this->servers_ as $i => $server) {
list($host, $port) = $server;
$h = $host . ':' . $port;
if (\hacklib_cast_as_boolean(array_key_exists($i, $fail_reason))) {
$h .= (string) $fail_reason[$i];
}
$hosts[] = $h;
}
$hostlist = implode(',', $hosts);
$error .= '(' . $hostlist . ')';
if (\hacklib_cast_as_boolean($this->debug_) && $this->debugHandler_ !== null) {
$dh = $this->debugHandler_;
$dh($error);
}
throw new TTransportException($error);
}
