Add ServerTiming response propagator

src/Propagation/ResponsePropagator/.gitattributes

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+* text=auto
+
+*.md diff=markdown
+*.php diff=php
+
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.php-cs-fixer.php export-ignore
+/phpstan.neon.dist export-ignore
+/phpunit.xml.dist export-ignore
+/psalm.xml.dist export-ignore
+/tests export-ignore

src/Propagation/ResponsePropagator/.gitignore

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+/vendor/

src/Propagation/ResponsePropagator/.php-cs-fixer.php

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+<?php
+$finder = PhpCsFixer\Finder::create()
+    ->exclude('vendor')
+    ->exclude('var/cache')
+    ->in(__DIR__);
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+    'concat_space' => ['spacing' => 'one'],
+    'declare_equal_normalize' => ['space' => 'none'],
+    'is_null' => true,
+    'modernize_types_casting' => true,
+    'ordered_imports' => true,
+    'php_unit_construct' => true,
+    'single_line_comment_style' => true,
+    'yoda_style' => false,
+    '@PSR2' => true,
+    'array_syntax' => ['syntax' => 'short'],
+    'blank_line_after_opening_tag' => true,
+    'blank_line_before_statement' => true,
+    'cast_spaces' => true,
+    'declare_strict_types' => true,
+    'function_typehint_space' => true,
+    'include' => true,
+    'lowercase_cast' => true,
+    'new_with_braces' => true,
+    'no_extra_blank_lines' => true,
+    'no_leading_import_slash' => true,
+    'echo_tag_syntax' => true,
+    'no_unused_imports' => true,
+    'no_useless_else' => true,
+    'no_useless_return' => true,
+    'phpdoc_order' => true,
+    'phpdoc_scalar' => true,
+    'phpdoc_types' => true,
+    'short_scalar_cast' => true,
+    'single_blank_line_before_namespace' => true,
+    'single_quote' => true,
+    'trailing_comma_in_multiline' => true,
+    ])
+    ->setRiskyAllowed(true)
+    ->setFinder($finder);
+

src/Propagation/ResponsePropagator/README.md

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+[![Releases](https://img.shields.io/badge/releases-purple)](https://github.com/opentelemetry-php/contrib-propagator-traceresponse/releases)
+[![Issues](https://img.shields.io/badge/issues-pink)](https://github.com/open-telemetry/opentelemetry-php/issues)
+[![Source](https://img.shields.io/badge/source-contrib-green)](https://github.com/open-telemetry/opentelemetry-php-contrib/tree/main/src/Propagation/TraceResponse)
+[![Mirror](https://img.shields.io/badge/mirror-opentelemetry--php--contrib-blue)](https://github.com/opentelemetry-php/contrib-propagator-traceresponse)
+[![Latest Version](http://poser.pugx.org/open-telemetry/opentelemetry-propagation-traceresponse/v/unstable)](https://packagist.org/packages/open-telemetry/opentelemetry-propagation-traceresponse/)
+[![Stable](http://poser.pugx.org/open-telemetry/opentelemetry-propagation-traceresponse/v/stable)](https://packagist.org/packages/open-telemetry/opentelemetry-propagation-traceresponse/)
+
+This is a read-only subtree split of https://github.com/open-telemetry/opentelemetry-php-contrib.
+
+# OpenTelemetry TraceResponse Propagator
+
+**Note:** This package is experimental as `traceresponse` is currently an editors' draft.
+
+This package provides a [Trace Context HTTP Response Headers Format](https://w3c.github.io/trace-context/#trace-context-http-response-headers-format)
+propagator to inject the current span context into Response datastructures.
+
+The main goal is to allow client-side technology (Real User Monitoring, HTTP Clients) to record
+the server side context in order to allow referencing it.
+
+## Requirements
+
+* OpenTelemetry SDK and exporters (required to actually export traces)
+
+Optional:
+* OpenTelemetry extension (Some instrumentations can automatically use the `TraceResponsePropagator`)
+
+## Usage
+
+Assuming there is an active `SpanContext`, you can inject it into your response as follows:
+
+```php
+// your framework probably provides a datastructure to model HTTP responses
+// and allows you to hook into the end of a request / listen to a matching event.
+$response = new Response();
+
+// get the current scope, bail out if none
+$scope = Context::storage()->scope();
+if (null === $scope) {
+    return;
+}
+
+// create a PropagationSetterInterface that knows how to inject response headers
+$propagationSetter = new class implements OpenTelemetry\Context\Propagation\PropagationSetterInterface {
+    public function set(&$carrier, string $key, string $value) : void {
+        $carrier->headers->set($key, $value);
+    }
+};
+$propagator = new TraceResponseProgator();
+$propagator->inject($response, $propagationSetter, $scope->context());
+```
+
+## Installation via composer
+
+```bash
+$ composer require open-telemetry/opentelemetry-propagation-traceresponse
+```
+
+## Installing dependencies and executing tests
+
+From TraceResponse subdirectory:
+
+```bash
+$ composer install
+$ ./vendor/bin/phpunit tests
+```

src/Propagation/ResponsePropagator/composer.json

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+{
+  "name": "open-telemetry/opentelemetry-propagation-response",
+  "description": "OpenTelemetry response propagator api",
+  "keywords": ["opentelemetry", "otel", "open-telemetry", "propagator", "response"],
+  "type": "library",
+  "homepage": "https://opentelemetry.io/docs/php",
+  "readme": "./README.md",
+  "license": "Apache-2.0",
+  "minimum-stability": "dev",
+  "prefer-stable": true,
+  "require": {
+    "php": "^7.0|^8.0",
+    "open-telemetry/context": "^1.0"
+  },
+  "autoload": {
+    "psr-4": {
+      "OpenTelemetry\\Contrib\\Propagation\\Response\\": "src/"
+    }
+  },
+  "require-dev": {
+    "friendsofphp/php-cs-fixer": "^3",
+    "phan/phan": "^5.0",
+    "phpstan/phpstan": "^1.1",
+    "phpstan/phpstan-phpunit": "^1.0",
+    "psalm/plugin-phpunit": "^0.16",
+    "open-telemetry/sdk": "^1.0",
+    "phpunit/phpunit": "^9.5",
+    "vimeo/psalm": "^4.0",
+    "symfony/http-client": "^5.4|^6.0",
+    "guzzlehttp/promises": "^1.5",
+    "php-http/message-factory": "^1.0",
+    "nyholm/psr7": "^1.5"
+  },
+  "config": {
+    "allow-plugins": {
+      "php-http/discovery": true
+    }
+  }
+}

src/Propagation/ResponsePropagator/phpstan.neon.dist

@@ -0,0 +1,9 @@
+includes:
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+
+parameters:
+    tmpDir: var/cache/phpstan
+    level: 5
+    paths:
+        - src
+        - tests

src/Propagation/ResponsePropagator/phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd"
+    backupGlobals="false"
+    backupStaticAttributes="false"
+    cacheResult="false"
+    colors="false"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    forceCoversAnnotation="false"
+    processIsolation="false"
+    stopOnError="false"
+    stopOnFailure="false"
+    stopOnIncomplete="false"
+    stopOnSkipped="false"
+    stopOnRisky="false"
+    timeoutForSmallTests="1"
+    timeoutForMediumTests="10"
+    timeoutForLargeTests="60"
+    verbose="true">
+
+    <coverage processUncoveredFiles="true" disableCodeCoverageIgnore="false">
+        <include>
+            <directory>src</directory>
+        </include>
+    </coverage>
+
+    <php>
+        <ini name="date.timezone" value="UTC" />
+        <ini name="display_errors" value="On" />
+        <ini name="display_startup_errors" value="On" />
+        <ini name="error_reporting" value="E_ALL" />
+    </php>
+
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests/Unit</directory>
+        </testsuite>
+    </testsuites>
+
+</phpunit>

src/Propagation/ResponsePropagator/psalm.xml.dist

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+<?xml version="1.0"?>
+<psalm
+    errorLevel="3"
+    cacheDirectory="var/cache/psalm"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd">
+    <projectFiles>
+        <directory name="src"/>
+        <directory name="tests"/>
+    </projectFiles>
+    <plugins>
+        <pluginClass class="Psalm\PhpUnitPlugin\Plugin"/>
+    </plugins>
+</psalm>

src/Propagation/TraceResponse/src/ResponsePropagator.php → src/Propagation/ResponsePropagator/src/ResponsePropagator.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Contrib\Propagation\TraceResponse;
+namespace OpenTelemetry\Contrib\Propagation\Response;
 
 use OpenTelemetry\Context\ContextInterface;
 use OpenTelemetry\Context\Propagation\PropagationSetterInterface;

src/Propagation/ResponsePropagator/tests/Unit/PropagatorTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Tests\Propagation\Response\Unit;
+
+use OpenTelemetry\API\Trace\SpanContext;
+use OpenTelemetry\API\Trace\SpanContextInterface;
+use OpenTelemetry\API\Trace\SpanContextValidator;
+use OpenTelemetry\API\Trace\TraceFlags;
+use OpenTelemetry\API\Trace\TraceState;
+use OpenTelemetry\Context\Context;
+use OpenTelemetry\Context\ContextInterface;
+use OpenTelemetry\Contrib\Propagation\TraceResponse\TraceResponsePropagator as Propagator;
+use OpenTelemetry\SDK\Trace\Span;
+use PHPUnit\Framework\TestCase;
+
+class PropagatorTest extends TestCase
+{
+    private const TRACE_ID = '5759e988bd862e3fe1be46a994272793';
+    private const SPAN_ID = '53995c3f42cd8ad8';
+    private const TRACERESPONSE_HEADER_SAMPLED = '00-5759e988bd862e3fe1be46a994272793-53995c3f42cd8ad8-1';
+    private const TRACERESPONSE_HEADER_NOT_SAMPLED = '00-5759e988bd862e3fe1be46a994272793-53995c3f42cd8ad8-0';
+
+    /**
+     * @test
+     * fields() should return an array of fields with AWS X-Ray Trace ID Header
+     */
+    public function test_fields()
+    {
+        $propagator = new Propagator();
+        $this->assertSame($propagator->fields(), [Propagator::TRACERESPONSE]);
+    }
+
+    /**
+     * @test
+     * Injects with a valid traceId, spanId, and is sampled
+     * restore(string $traceId, string $spanId, bool $sampled = false, bool $isRemote = false, ?API\TraceState $traceState = null): SpanContext
+     */
+    public function test_inject_valid_sampled_trace_id()
+    {
+        $carrier = [];
+        (new Propagator())->inject(
+            $carrier,
+            null,
+            $this->withSpanContext(
+                SpanContext::create(self::TRACE_ID, self::SPAN_ID, TraceFlags::SAMPLED),
+                Context::getCurrent()
+            )
+        );
+
+        $this->assertSame(
+            [Propagator::TRACERESPONSE => self::TRACERESPONSE_HEADER_SAMPLED],
+            $carrier
+        );
+    }
+
+    /**
+     * @test
+     * Injects with a valid traceId, spanId, and is not sampled
+     */
+    public function test_inject_valid_not_sampled_trace_id()
+    {
+        $carrier = [];
+        (new Propagator())->inject(
+            $carrier,
+            null,
+            $this->withSpanContext(
+                SpanContext::create(self::TRACE_ID, self::SPAN_ID),
+                Context::getCurrent()
+            )
+        );
+
+        $this->assertSame(
+            [Propagator::TRACERESPONSE => self::TRACERESPONSE_HEADER_NOT_SAMPLED],
+            $carrier
+        );
+    }
+
+    /**
+     * @test
+     * Test inject with tracestate - note: tracestate is not a part of traceresponse
+     */
+    public function test_inject_trace_id_with_trace_state()
+    {
+        $carrier = [];
+        (new Propagator())->inject(
+            $carrier,
+            null,
+            $this->withSpanContext(
+                SpanContext::create(self::TRACE_ID, self::SPAN_ID, TraceFlags::SAMPLED, new TraceState('vendor1=opaqueValue1')),
+                Context::getCurrent()
+            )
+        );
+
+        $this->assertSame(
+            [Propagator::TRACERESPONSE => self::TRACERESPONSE_HEADER_SAMPLED],
+            $carrier
+        );
+    }
+
+    /**
+     * @test
+     * Test with an invalid spanContext, should return null
+     */
+    public function test_inject_trace_id_with_invalid_span_context()
+    {
+        $carrier = [];
+        (new Propagator())->inject(
+            $carrier,
+            null,
+            $this->withSpanContext(
+                SpanContext::create(SpanContextValidator::INVALID_TRACE, SpanContextValidator::INVALID_SPAN, TraceFlags::SAMPLED, new TraceState('vendor1=opaqueValue1')),
+                Context::getCurrent()
+            )
+        );
+
+        $this->assertEmpty($carrier);
+    }
+
+    private function withSpanContext(SpanContextInterface $spanContext, ContextInterface $context): ContextInterface
+    {
+        return $context->withContextValue(Span::wrap($spanContext));
+    }
+}

src/Propagation/ServerTiming/.gitattributes

@@ -0,0 +1,12 @@
+* text=auto
+
+*.md diff=markdown
+*.php diff=php
+
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.php-cs-fixer.php export-ignore
+/phpstan.neon.dist export-ignore
+/phpunit.xml.dist export-ignore
+/psalm.xml.dist export-ignore
+/tests export-ignore

src/Propagation/ServerTiming/.gitignore

@@ -0,0 +1 @@
+/vendor/