zmq-fileserver/src/FileServer.php
2020-06-21 00:10:32 +02:00

175 lines
5.1 KiB
PHP

<?php
class FileServer
{
private ZMQSocket $commandSocket;
private ZMQSocket $querySocket;
private ZMQPoll $poll;
private string $rootDirectory;
public function __construct(ZMQContext $context, string $rootDirectory, array $commandDSNs, array $queryDSNs)
{
$this->initializeCommandSocket($context, $commandDSNs);
$this->initializeQuerySocket($context, $queryDSNs);
$this->initializeRootDirectory($rootDirectory);
$this->initializePoll();
$this->logf('Info: listening...');
}
private function logf(string $format, ...$args): void
{
printf("[%s] %s%s", date('H:i:s'), sprintf($format, ...$args), PHP_EOL);
}
private function initializeRootDirectory(string $rootDirectory): void
{
$this->rootDirectory = rtrim($rootDirectory, DIRECTORY_SEPARATOR);
if (!is_dir($this->rootDirectory)) {
mkdir($this->rootDirectory, 0777, true);
}
if (!is_dir($this->rootDirectory)) {
$this->logf('Error: unable to create directory \'%s\'', $this->rootDirectory);
die(1);
}
}
private function initializeCommandSocket(ZMQContext $context, array $commandDSNs): void
{
if (count($commandDSNs) === 0) {
$this->logf('Error: need at least one DSN for the command socket');
die(1);
}
$this->commandSocket = new ZMQSocket($context, ZMQ::SOCKET_PULL);
$this->commandSocket->setSockOpt(ZMQ::SOCKOPT_HWM, 5);
foreach ($commandDSNs as $dsn) {
$this->commandSocket->bind($dsn);
}
}
private function initializeQuerySocket(ZMQContext $context, array $queryDSNs): void
{
if (count($queryDSNs) === 0) {
$this->logf('Error: need at least one DSN for the query socket');
die(1);
}
$this->querySocket = new ZMQSocket($context, ZMQ::SOCKET_REP);
$this->querySocket->setSockOpt(ZMQ::SOCKOPT_HWM, 5);
foreach ($queryDSNs as $dsn) {
$this->querySocket->bind($dsn);
}
}
private function initializePoll(): void
{
$this->poll = new ZMQPoll();
$this->poll->add($this->commandSocket, ZMQ::POLL_IN);
$this->poll->add($this->querySocket, ZMQ::POLL_IN);
}
public function run()
{
$readable = $writable = [];
while (true) {
$this->poll->poll($readable, $writable);
foreach ($readable as $socket) {
$socket === $this->querySocket and $this->onQuery();
$socket === $this->commandSocket and $this->onCommand();
}
}
}
private function onQuery(): void
{
$arguments = $this->querySocket->recvMulti();
$query = array_shift($arguments);
switch ($query) {
case 'LOAD':
if (count($arguments) !== 2) {
$this->querySocket->send(-1);
$this->onUnexpectedAmountOfArguments($query, 2, count($arguments));
return;
}
$this->querySocket->send(@file_get_contents("{$this->rootDirectory}/{$arguments[0]}/{$arguments[1]}") ?: -1);
break;
case 'CONTAINS':
if (count($arguments) !== 2) {
$this->querySocket->send(-1);
$this->onUnexpectedAmountOfArguments($query, 2, count($arguments));
return;
}
$this->querySocket->send(file_exists("{$this->rootDirectory}/{$arguments[0]}/{$arguments[1]}") ? 'Y' : 'N');
break;
default:
$this->querySocket->send(-1);
$this->onUnknownInput($query, $arguments);
break;
}
}
private function onCommand(): void
{
$arguments = $this->commandSocket->recvMulti();
$command = array_shift($arguments);
switch ($command) {
case 'SAVE':
if (count($arguments) !== 3) {
$this->onUnexpectedAmountOfArguments($command, 3, count($arguments));
return;
}
$this->saveFile($arguments[0], $arguments[1], $arguments[2]);
break;
case 'DELETE':
if (count($arguments) !== 2) {
$this->onUnexpectedAmountOfArguments($command, 2, count($arguments));
return;
}
$this->deleteFile($arguments[0], $arguments[1]);
break;
case 'DELETE_ALL':
if (count($arguments) !== 1) {
$this->onUnexpectedAmountOfArguments($command, 1, count($arguments));
return;
}
$this->deleteAll($arguments[0]);
break;
default:
$this->onUnknownInput($command, $arguments);
break;
}
}
private function onUnexpectedAmountOfArguments(string $input, int $expected, int $actual): void
{
$this->logf('Error: unexpected amount of arguments for input \'%s\' (%d/%d)', $input, $actual, $expected);
}
private function onUnknownInput(string $input, array $arguments): void
{
$arguments = array_map(fn($v) => substr($v, 0, 12), $arguments);
$this->logf('Error: unknown input \'%s\' with arguments [%s]', $input, implode(', ', $arguments));
}
private function saveFile(string &$namespace, string &$name, string &$content): void
{
is_dir($targetDir = "{$this->rootDirectory}/$namespace") or mkdir($targetDir, 0777, true);
file_put_contents("$targetDir/$name", $content);
}
private function deleteFile(string &$namespace, string &$name): void
{
@unlink("{$this->rootDirectory}/$namespace/$name");
}
private function deleteAll(string &$namespace): void
{
$directory = "{$this->rootDirectory}/$namespace";
if (!is_dir($directory)) {
return;
}
static $source = '/tmp/zmq.fileserver.rsync_empty_dir.d';
is_dir($source) or @mkdir($source);
@system("nohup rsync --archive --recursive --delete {$source}/ {$directory}/ 2>&1 >/dev/null &");
@rmdir($directory);
}
}