use async php runtime (open-telemetry#823)

* use async php runtime
To better demonstrate PHP's capabilities, use an async runtime (react/http). This means that
batch exporters (traces and metrics) are long-lived and more efficient, and they can now use
export delays to only send batches after the configured time has elapsed.
Update auto-instrumentation extension to install from PECL (the preferred mechanism, which we've
just set up), and bump other dependencies to their latest beta versions.

* update changelog

CHANGELOG.md

@@ -299,3 +299,5 @@ significant modifications will be credited to OpenTelemetry Authors.
   ([#764](https://github.com/open-telemetry/opentelemetry-demo/pull/764))
 * [chore] align memory limits with Helm chart
   ([#781](https://github.com/open-telemetry/opentelemetry-demo/pull/781))
+* Use an async PHP runtime, bump versions to latest betas
+  ([#823](https://github.com/open-telemetry/opentelemetry-demo/pull/823))

src/quoteservice/Dockerfile

@@ -25,24 +25,21 @@ RUN composer install \
     --no-dev \
     --prefer-dist
 
-FROM php:8.2-apache
+FROM php:8.2-cli
 
 ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
 RUN chmod +x /usr/local/bin/install-php-extensions \
   && install-php-extensions \
     opcache \
+    pcntl \
     protobuf \
-    open-telemetry/opentelemetry-php-instrumentation@1.0.0beta2
+    opentelemetry-1.0.0beta3
 
 WORKDIR /var/www
 COPY --from=build /tmp/vendor/ ./vendor/
 COPY ./src/quoteservice/ /var/www
 
-ENV APACHE_DOCUMENT_ROOT /var/www/public
-RUN sed -ri -e 's|/var/www/html|${APACHE_DOCUMENT_ROOT}|g' /etc/apache2/sites-available/*.conf \
-    && a2enmod rewrite \
-    && echo "ServerName quoteservice" >> /etc/apache2/apache2.conf \
-    && sed -i "s/80/\$\{QUOTE_SERVICE_PORT\}/g" /etc/apache2/sites-available/000-default.conf /etc/apache2/ports.conf
+CMD php public/index.php
 
 USER www-data
 EXPOSE ${QUOTE_SERVICE_PORT}

src/quoteservice/app/routes.php

@@ -53,8 +53,7 @@ function calculateQuote($jsonObject): float
         $span = Span::getCurrent();
         $span->addEvent('Received get quote request, processing it');
 
-        $body = $request->getBody()->getContents();
-        $jsonObject = json_decode($body, true);
+        $jsonObject = $request->getParsedBody();
 
         $data = calculateQuote($jsonObject);
 

src/quoteservice/composer.json

@@ -6,15 +6,16 @@
     "require": {
         "php": ">= 8.2",
         "ext-json": "*",
-        "monolog/monolog": "2.8.0",
-        "open-telemetry/api": "1.0.0beta4",
-        "open-telemetry/sdk": "1.0.0beta3",
-        "open-telemetry/exporter-otlp": "1.0.0beta3",
-        "open-telemetry/opentelemetry-auto-slim": "1.0.0beta4",
+        "monolog/monolog": "3.3.1",
+        "open-telemetry/api": "1.0.0beta5",
+        "open-telemetry/sdk": "1.0.0beta6",
+        "open-telemetry/exporter-otlp": "1.0.0beta5",
+        "open-telemetry/opentelemetry-auto-slim": "1.0.0beta7",
         "guzzlehttp/guzzle": "7.4.5",
         "php-di/php-di": "6.4.0",
         "php-di/slim-bridge": "3.2.0",
         "php-http/guzzle7-adapter": "1.0.0",
+        "react/http": "v1.8.0",
         "slim/psr7": "1.5",
         "slim/slim": "4.10.0"
     },

src/quoteservice/public/index.php

@@ -20,7 +20,11 @@
 use Monolog\Handler\StreamHandler;
 use Monolog\Logger;
 use OpenTelemetry\API\Common\Log\LoggerHolder;
+use Psr\Http\Message\ServerRequestInterface;
 use Psr\Log\LogLevel;
+use React\EventLoop\Loop;
+use React\Http\HttpServer;
+use React\Socket\SocketServer;
 use Slim\Factory\AppFactory;
 
 require __DIR__ . '/../vendor/autoload.php';
@@ -59,6 +63,26 @@
 
 // Add Error Middleware
 $errorMiddleware = $app->addErrorMiddleware(true, true, true);
+Loop::get()->addSignal(SIGTERM, function() {
+    exit;
+});
 
-// Run App
-$app->run();
+$server = new HttpServer(function (ServerRequestInterface $request) use ($app) {
+    $response = $app->handle($request);
+    echo sprintf('[%s] "%s %s HTTP/%s" %d %d %s',
+        date('Y-m-d H:i:sP'),
+        $request->getMethod(),
+        $request->getUri()->getPath(),
+        $request->getProtocolVersion(),
+        $response->getStatusCode(),
+        $response->getBody()->getSize(),
+        PHP_EOL,
+    );
+
+    return $response;
+});
+$address = '0.0.0.0:' . getenv('QUOTE_SERVICE_PORT');
+$socket = new SocketServer($address);
+$server->listen($socket);
+
+echo "Listening on: {$address}" . PHP_EOL;