file-based import-export feature

Author: nekufa

src/Metrics/Exporter/PrometheusExporter.php

@@ -10,6 +10,11 @@
 
 class PrometheusExporter extends Exporter
 {
+    public function toFile(string $path, string $prefix = '', array $labels = []): void
+    {
+        file_put_contents($path, $this->toString($prefix, $labels));
+    }
+
     public function toString(string $prefix = '', array $labels = []): string
     {
         $info = [];

src/Metrics/Importer/PrometheusImporter.php

@@ -12,6 +12,10 @@ class PrometheusImporter
     public function __construct(private Registry $registry, private Info $info)
     {
     }
+    public function fromFile(string $path, string $prefix = ''): self
+    {
+        return $this->fromString(file_get_contents($path), $prefix);
+    }
 
     public function fromString(string $string, string $prefix = ''): self
     {

tests/Metrics/ImporterTest.php

@@ -33,7 +33,12 @@ public function test(): void
         $registry2 = new Registry();
         $info2 = new Info();
         $importer = new PrometheusImporter($registry2, $info2);
-        $importer->fromString($exporter->toString('tester_'), 'tester_');
+        $filename = '/tmp/' . bin2hex(random_bytes(32));
+
+        $exporter->toFile($filename, 'tester_');
+        $importer->fromFile($filename, 'tester_');
+
+        unlink($filename);
 
         $keys = [
             ['memory_usage', []],