adad

src/App/RedisClient.php

@@ -0,0 +1,132 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+final class RedisClient
+{
+    private string $host;
+    private int $port;
+    private ?string $password;
+    private int $db;
+    private ?\Socket $socket = null;
+    private $stream = null;
+
+    public function __construct(string $host, int $port = 6379, ?string $password = null, int $db = 0)
+    {
+        $this->host = $host;
+        $this->port = $port;
+        $this->password = $password;
+        $this->db = $db;
+    }
+
+    private function connect(): void
+    {
+        if ($this->stream) {
+            return;
+        }
+        $errNo = 0;
+        $errStr = '';
+        $this->stream = stream_socket_client(
+            "tcp://{$this->host}:{$this->port}",
+            $errNo,
+            $errStr,
+            3.0,
+            STREAM_CLIENT_CONNECT
+        );
+        if (!$this->stream) {
+            throw new \RuntimeException("Redis connect failed: {$errStr}");
+        }
+        stream_set_timeout($this->stream, 3);
+
+        if ($this->password !== null && $this->password !== '') {
+            $this->command(['AUTH', $this->password]);
+        }
+        if ($this->db > 0) {
+            $this->command(['SELECT', (string)$this->db]);
+        }
+    }
+
+    public function command(array $args)
+    {
+        $this->connect();
+        $payload = '*' . count($args) . "\r\n";
+        foreach ($args as $arg) {
+            $arg = (string)$arg;
+            $payload .= '$' . strlen($arg) . "\r\n" . $arg . "\r\n";
+        }
+        fwrite($this->stream, $payload);
+
+        return $this->readResponse();
+    }
+
+    private function readResponse()
+    {
+        $line = $this->readLine();
+        if ($line === '') {
+            throw new \RuntimeException('Redis empty response');
+        }
+        $type = $line[0];
+        $payload = substr($line, 1);
+
+        switch ($type) {
+            case '+':
+                return $payload;
+            case '-':
+                throw new \RuntimeException('Redis error: ' . $payload);
+            case ':':
+                return (int)$payload;
+            case '$':
+                $len = (int)$payload;
+                if ($len === -1) {
+                    return null;
+                }
+                $data = $this->readBytes($len);
+                $this->readLine();
+                return $data;
+            case '*':
+                $count = (int)$payload;
+                if ($count === -1) {
+                    return null;
+                }
+                $items = [];
+                for ($i = 0; $i < $count; $i++) {
+                    $items[] = $this->readResponse();
+                }
+                return $items;
+            default:
+                throw new \RuntimeException('Redis protocol error');
+        }
+    }
+
+    private function readLine(): string
+    {
+        $line = '';
+        while (!feof($this->stream)) {
+            $chunk = fgets($this->stream);
+            if ($chunk === false) {
+                break;
+            }
+            $line .= $chunk;
+            if (str_ends_with($line, "\r\n")) {
+                break;
+            }
+        }
+        return rtrim($line, "\r\n");
+    }
+
+    private function readBytes(int $length): string
+    {
+        $data = '';
+        $remaining = $length;
+        while ($remaining > 0 && !feof($this->stream)) {
+            $chunk = fread($this->stream, $remaining);
+            if ($chunk === false || $chunk === '') {
+                break;
+            }
+            $data .= $chunk;
+            $remaining -= strlen($chunk);
+        }
+        return $data;
+    }
+}