feat: propagate clickhouse error code to ServerError (#266)

src/Exception/ServerError.php

@@ -7,10 +7,17 @@
 use Exception;
 use Psr\Http\Message\ResponseInterface;
 
+use function preg_match;
+
 final class ServerError extends Exception
 {
     public static function fromResponse(ResponseInterface $response): self
     {
-        return new self($response->getBody()->__toString());
+        $bodyContent = $response->getBody()->__toString();
+
+        return new self(
+            $bodyContent,
+            code: preg_match('~^Code: (\\d+). DB::Exception:~', $bodyContent, $matches) === 1 ? (int) $matches[1] : 0,
+        );
     }
 }

tests/Exception/ServerErrorTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimPod\ClickHouseClient\Tests\Exception;
+
+use Nyholm\Psr7\Factory\Psr17Factory;
+use PHPUnit\Framework\Attributes\CoversClass;
+use SimPod\ClickHouseClient\Exception\ServerError;
+use SimPod\ClickHouseClient\Tests\TestCaseBase;
+
+#[CoversClass(ServerError::class)]
+final class ServerErrorTest extends TestCaseBase
+{
+    public function testParseCode(): void
+    {
+        $psr17Factory = new Psr17Factory();
+        $response     = $psr17Factory->createResponse(501)
+            ->withBody(
+                $psr17Factory->createStream(
+                    // phpcs:ignore SlevomatCodingStandard.Files.LineLength.LineTooLong
+                    "Code: 48. DB::Exception: Table engine Distributed doesn't support mutations. (NOT_IMPLEMENTED) (version 24.3.12.75 (official build))",
+                ),
+            );
+
+        $serverError = ServerError::fromResponse($response);
+
+        self::assertSame(48, $serverError->getCode());
+    }
+}