From cdd7ad020e165fe680703b6d3319b908b682fb7a Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@fakecake.org>
Date: Fri, 20 Oct 2023 17:12:29 +0300
Subject: jaeger-client -> opentelemetry

---
 .../exporter-otlp/MetricExporterFactory.php        | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 vendor/open-telemetry/exporter-otlp/MetricExporterFactory.php

(limited to 'vendor/open-telemetry/exporter-otlp/MetricExporterFactory.php')

diff --git a/vendor/open-telemetry/exporter-otlp/MetricExporterFactory.php b/vendor/open-telemetry/exporter-otlp/MetricExporterFactory.php
new file mode 100644
index 000000000..284428b73
--- /dev/null
+++ b/vendor/open-telemetry/exporter-otlp/MetricExporterFactory.php
@@ -0,0 +1,110 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Contrib\Otlp;
+
+use OpenTelemetry\API\Signals;
+use OpenTelemetry\SDK\Common\Configuration\Configuration;
+use OpenTelemetry\SDK\Common\Configuration\Defaults;
+use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
+use OpenTelemetry\SDK\Common\Export\TransportInterface;
+use OpenTelemetry\SDK\Metrics\Data\Temporality;
+use OpenTelemetry\SDK\Metrics\MetricExporterFactoryInterface;
+use OpenTelemetry\SDK\Metrics\MetricExporterInterface;
+use OpenTelemetry\SDK\Registry;
+
+class MetricExporterFactory implements MetricExporterFactoryInterface
+{
+    private const DEFAULT_COMPRESSION = 'none';
+
+    private ?TransportFactoryInterface $transportFactory;
+
+    public function __construct(?TransportFactoryInterface $transportFactory = null)
+    {
+        $this->transportFactory = $transportFactory;
+    }
+
+    /**
+     * @psalm-suppress ArgumentTypeCoercion
+     */
+    public function create(): MetricExporterInterface
+    {
+        $protocol = Configuration::has(Variables::OTEL_EXPORTER_OTLP_METRICS_PROTOCOL)
+            ? Configuration::getEnum(Variables::OTEL_EXPORTER_OTLP_METRICS_PROTOCOL)
+            : Configuration::getEnum(Variables::OTEL_EXPORTER_OTLP_PROTOCOL);
+        $temporality = $this->getTemporality();
+
+        return new MetricExporter($this->buildTransport($protocol), $temporality);
+    }
+
+    /**
+     * @psalm-suppress UndefinedClass
+     */
+    private function buildTransport(string $protocol): TransportInterface
+    {
+        /**
+         * @todo (https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#periodic-exporting-metricreader)
+         * - OTEL_METRIC_EXPORT_INTERVAL
+         * - OTEL_METRIC_EXPORT_TIMEOUT
+         */
+        $endpoint = $this->getEndpoint($protocol);
+
+        $headers = Configuration::has(Variables::OTEL_EXPORTER_OTLP_METRICS_HEADERS)
+            ? Configuration::getMap(Variables::OTEL_EXPORTER_OTLP_METRICS_HEADERS)
+            : Configuration::getMap(Variables::OTEL_EXPORTER_OTLP_HEADERS);
+        $headers += OtlpUtil::getUserAgentHeader();
+        $compression = $this->getCompression();
+
+        $factoryClass = Registry::transportFactory($protocol);
+        $factory = $this->transportFactory ?: new $factoryClass();
+
+        return $factory->create(
+            $endpoint,
+            Protocols::contentType($protocol),
+            $headers,
+            $compression,
+        );
+    }
+
+    /**
+     * @todo return string|Temporality|null (php >= 8.0)
+     */
+    private function getTemporality()
+    {
+        $value = Configuration::getEnum(Variables::OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE);
+        switch (strtolower($value)) {
+            case 'cumulative':
+                return Temporality::CUMULATIVE;
+            case 'delta':
+                return Temporality::DELTA;
+            case 'lowmemory':
+                return null;
+            default:
+                throw new \UnexpectedValueException('Unknown temporality: ' . $value);
+        }
+    }
+
+    private function getCompression(): string
+    {
+        return Configuration::has(Variables::OTEL_EXPORTER_OTLP_METRICS_COMPRESSION) ?
+            Configuration::getEnum(Variables::OTEL_EXPORTER_OTLP_METRICS_COMPRESSION) :
+            Configuration::getEnum(Variables::OTEL_EXPORTER_OTLP_COMPRESSION, self::DEFAULT_COMPRESSION);
+    }
+
+    private function getEndpoint(string $protocol): string
+    {
+        if (Configuration::has(Variables::OTEL_EXPORTER_OTLP_METRICS_ENDPOINT)) {
+            return Configuration::getString(Variables::OTEL_EXPORTER_OTLP_METRICS_ENDPOINT);
+        }
+        $endpoint = Configuration::has(Variables::OTEL_EXPORTER_OTLP_ENDPOINT)
+            ? Configuration::getString(Variables::OTEL_EXPORTER_OTLP_ENDPOINT)
+            : Defaults::OTEL_EXPORTER_OTLP_ENDPOINT;
+        if ($protocol === Protocols::GRPC) {
+            return $endpoint . OtlpUtil::method(Signals::METRICS);
+        }
+
+        return HttpEndpointResolver::create()->resolveToString($endpoint, Signals::METRICS);
+    }
+}
-- 
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