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.github/workflows/ci.yml

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+name: PHPUnit Test
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-version: ['8.0', '8.1', '8.2', '8.3']
+    steps:
+      # Checkout the code
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # Set up PHP with matrix version
+      - name: Set up PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+
+      # Install dependencies via Composer
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+
+      # Run PHPUnit tests
+      - name: Run PHPUnit
+        run: ./vendor/bin/phpunit

.gitignore

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+/vendor/
+/composer.lock
+/.phpunit.result.cache
+/.idea

LICENSE

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 MIT License
 
-Copyright (c) 2024 belka-car
+Copyright (c) 2024 BelkaCar
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

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+# Gauge Exporter PHP Client
+
+PHP Client for [Gague Exporter](https://github.com/belka-car/gague-exporter). 
+
+
+## Usage example
+```php
+<?php
+
+use Belkacar\GaugeExporterClient\GaugeExporterClient;
+use Belkacar\GaugeExporterClient\MetricBag;
+use GuzzleHttp\Client;
+
+require_once "vendor/autoload.php";
+
+$bag = new MetricBag('metric-name');
+$bag->increment(['a' => 'b'], 100);
+$bag->increment(['a' => 'b', 'c' => 'd'], 500);
+
+$client = new GaugeExporterClient(new Client(), 'https://127.0.0.1:8181', ['env' => 'prod']);
+$client->send($bag, 150);
+```

composer.json

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+{
+    "name": "belkacar/gauge-exporter-client",
+    "description": "Gauge Exporter PHP client",
+    "type": "library",
+    "license": "MIT",
+    "require": {
+        "php": "^8.0",
+        "ext-json": "*",
+        "guzzlehttp/psr7": "^2.6",
+        "psr/http-client": "^1.0",
+        "webmozart/assert": "^1.11"
+    },
+    "autoload": {
+        "psr-4": {
+            "Belkacar\\GaugeExporterClient\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Belkacar\\GaugeExporterClient\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": true
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.6",
+        "php-http/mock-client": "^1.6"
+    }
+}

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php"
+         backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         verbose="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false">
+    <testsuites>
+        <testsuite name="Unit Tests">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

src/Exception/BadResponseException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Belkacar\GaugeExporterClient\Exception;
+
+use Psr\Http\Client\ClientExceptionInterface;
+use Psr\Http\Message\ResponseInterface;
+
+final class BadResponseException extends \RuntimeException implements ClientExceptionInterface
+{
+    private ResponseInterface $response;
+
+    public function __construct(ResponseInterface $response)
+    {
+        $this->response = $response;
+        parent::__construct('');
+    }
+
+    public function getResponse(): ResponseInterface
+    {
+        return $this->response;
+    }
+}

src/GaugeExporterClient.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Belkacar\GaugeExporterClient;
+
+use Belkacar\GaugeExporterClient\Exception\BadResponseException;
+use Psr\Http\Client\ClientExceptionInterface;
+use Psr\Http\Client\ClientInterface;
+use GuzzleHttp\Psr7\Request;
+use stdClass;
+
+final class GaugeExporterClient
+{
+    private string $apiDomain;
+    private ClientInterface $client;
+    private array $defaultLabels;
+
+    public function __construct(ClientInterface $client, string $apiDomain, array $defaultLabels = [])
+    {
+        $this->client = $client;
+        $this->apiDomain = trim($apiDomain, " \n\r\t\v\0/");
+        $this->defaultLabels = MetricLine::normalizeLabels($defaultLabels);
+    }
+
+    /**
+     * @throws BadResponseException
+     * @throws ClientExceptionInterface
+     */
+    public function send(MetricBag $metricBag, int $ttlSec): void
+    {
+        $body = [
+            'ttl' => $ttlSec,
+            'data' => $this->generateData($metricBag),
+        ];
+        $request = new Request(
+            'PUT',
+            sprintf('%s/gauge/%s', $this->apiDomain, $metricBag->getMetricName()),
+            ['Content-Type' => 'application/json'],
+            json_encode($body),
+        );
+
+        $response = $this->client->sendRequest($request);
+        if ($response->getStatusCode() !== 200) {
+            throw new BadResponseException($response);
+        }
+    }
+
+    private function generateData(MetricBag $metricBag): array
+    {
+        $result = [];
+        foreach ($metricBag->getLogLines() as $logLine) {
+            $labels = array_merge($this->defaultLabels, $logLine->getLabels());
+            $result[] = [
+                'labels' => !empty($labels) ? $labels : new stdClass(),
+                'value' => $logLine->getValue()
+            ];
+        }
+        return $result;
+    }
+}

src/MetricBag.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Belkacar\GaugeExporterClient;
+
+use InvalidArgumentException;
+
+final class MetricBag
+{
+    private const METRIC_NAME_PATTERN = '/^[a-zA-Z_:][a-zA-Z0-9_:.]*$/';
+
+    private string $metric;
+
+    /**
+     * @var array<string, float>
+     */
+    private array $labelsToValuePair;
+
+    public function __construct(string $metricName)
+    {
+        if (!preg_match(self::METRIC_NAME_PATTERN, $metricName)) {
+            throw new InvalidArgumentException('Metric name "' . $metricName . '" does not match ' . self::METRIC_NAME_PATTERN);
+        }
+        $this->metric = $metricName;
+        $this->labelsToValuePair = [];
+    }
+
+    public function set(array $labels, float $value): void
+    {
+        $labels = MetricLine::normalizeLabels($labels);
+
+        $this->labelsToValuePair[json_encode($labels)] = $value;
+    }
+
+    public function increment(array $labels, float $value = 1): void
+    {
+        $labels = MetricLine::normalizeLabels($labels);
+
+        $key = json_encode($labels);
+        if (!array_key_exists($key, $this->labelsToValuePair)) {
+            $this->labelsToValuePair[$key] = 0;
+        }
+        $this->labelsToValuePair[$key] += $value;
+    }
+
+    public function getMetricName(): string
+    {
+        return $this->metric;
+    }
+
+    /**
+     * @return list<MetricLine>
+     */
+    public function getLogLines(): array
+    {
+        $result = [];
+        foreach ($this->labelsToValuePair as $labels => $value) {
+            $result[] = new MetricLine(json_decode($labels, true), $value);
+        }
+        return $result;
+    }
+}

src/MetricLine.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Belkacar\GaugeExporterClient;
+
+use InvalidArgumentException;
+
+final class MetricLine
+{
+    private array $labels;
+    private float $value;
+
+    public function __construct(array $labels, float $value)
+    {
+        $this->labels = self::normalizeLabels($labels);
+        $this->value = $value;
+    }
+
+    public function getValue(): float
+    {
+        return $this->value;
+    }
+
+    public function getLabels(): array
+    {
+        return $this->labels;
+    }
+
+    public static function normalizeLabels(array $labels): array
+    {
+        if (count(array_filter(array_keys($labels), 'is_int')) > 0) {
+            throw new InvalidArgumentException('Labels must be specified as associative array');
+        }
+        asort($labels);
+
+        return $labels;
+    }
+}