From b10ac0223be7162f293b453bb9938fcfd51723fa Mon Sep 17 00:00:00 2001
From: dmitry krokhin <nekufa@gmail.com>
Date: Tue, 17 Aug 2021 20:18:52 +0300
Subject: [PATCH] file-based import-export feature

---
 src/Metrics/Exporter/PrometheusExporter.php | 5 +++++
 src/Metrics/Importer/PrometheusImporter.php | 4 ++++
 tests/Metrics/ImporterTest.php              | 7 ++++++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/Metrics/Exporter/PrometheusExporter.php b/src/Metrics/Exporter/PrometheusExporter.php
index 4bdc437..df4c1fa 100644
--- a/src/Metrics/Exporter/PrometheusExporter.php
+++ b/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 = [];
diff --git a/src/Metrics/Importer/PrometheusImporter.php b/src/Metrics/Importer/PrometheusImporter.php
index 0c1fdfa..8a5a52e 100644
--- a/src/Metrics/Importer/PrometheusImporter.php
+++ b/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
     {
diff --git a/tests/Metrics/ImporterTest.php b/tests/Metrics/ImporterTest.php
index 53af9f3..e48d3d2 100644
--- a/tests/Metrics/ImporterTest.php
+++ b/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', []],