Add FFI Fiber support preload example (#524)

.editorconfig

@@ -12,5 +12,8 @@ trim_trailing_whitespace = true
 [*.md]
 trim_trailing_whitespace = false
 
+[docker-compose.*.yaml]
+indent_size = 2
+
 [Makefile]
 indent_style = tab

Makefile

@@ -34,11 +34,13 @@ collector:
 	docker-compose -f docker-compose-collector.yaml run -e OTEL_EXPORTER_OTLP_ENDPOINT=otel-collector:4317 --rm php php ./examples/AlwaysOnOTLPGrpcExample2.php
 	docker-compose -f docker-compose-collector.yaml stop
 
+fiber-ffi-example:
+	@docker-compose -f docker-compose.fiber-ffi.yaml -p opentelemetry-php_fiber-ffi-example up -d web
 metrics-prometheus-example:
-	@docker-compose -f docker-compose.prometheus.yaml up -d web
-	@docker-compose -f docker-compose.prometheus.yaml run php-prometheus php /var/www/public/examples/prometheus/PrometheusMetricsExample.php
+	@docker-compose -f docker-compose.prometheus.yaml -p opentelemetry-php_metrics-prometheus-example up -d web
+	@docker-compose -f docker-compose.prometheus.yaml -p opentelemetry-php_metrics-prometheus-example run --rm php php examples/prometheus/PrometheusMetricsExample.php
 stop-prometheus:
-	@docker-compose -f docker-compose.prometheus.yaml stop
+	@docker-compose -f docker-compose.prometheus.yaml -p opentelemetry-php_metrics-prometheus-example stop
 proto:
 	@docker-compose -f docker-compose.proto.yaml up proto
 bash:

docker-compose.fiber-ffi.yaml

@@ -0,0 +1,26 @@
+version: '3.8'
+services:
+  web:
+    image: nginx:alpine
+    ports:
+      - '8080:80'
+    depends_on:
+      - php
+    volumes:
+      - ./docker/examples/nginx.conf:/etc/nginx/conf.d/default.conf:ro
+  php:
+    build:
+      context: .
+      dockerfile: docker/examples/Dockerfile
+      args:
+        - PHP_VERSION=8.1-fpm
+        - EXT_ENABLE=ffi
+    environment:
+      - OTEL_PHP_FIBERS_ENABLED=true
+    command:
+      - php-fpm
+      - -d
+      - opcache.preload=/php/vendor/autoload.php
+    volumes:
+      - ./tests/Context/Fiber/test_context_switching_ffi_observer.phpt:/var/www/public/index.php
+      - ./:/php

docker-compose.prometheus.yaml

@@ -15,16 +15,19 @@ services:
     ports:
       - 8080:80
     depends_on:
-      - php-prometheus
+      - php
     volumes:
-      - ./docker/prometheus/nginx.conf:/etc/nginx/conf.d/default.conf
-      - ./docker/prometheus/index.php:/var/www/public/index.php
-  php-prometheus:
+      - ./docker/examples/nginx.conf:/etc/nginx/conf.d/default.conf:ro
+  php:
     build:
       context: .
-      dockerfile: docker/prometheus/Dockerfile
+      dockerfile: docker/examples/Dockerfile
+      args:
+        - PHP_VERSION=7.4-fpm
+        - EXT_ENABLE=redis
     volumes:
-      - ./:/var/www/public
+      - ./examples/prometheus/index.php:/var/www/public/index.php
+      - ./:/php
     depends_on:
       - redis
-      - prometheus
+      - prometheus

docker/examples/Dockerfile

@@ -0,0 +1,34 @@
+
+ARG PHP_VERSION
+ARG PHP_ALPINE_VERSION
+
+FROM php:${PHP_VERSION:+${PHP_VERSION}-}alpine${PHP_ALPINE_VERSION} AS php
+
+ENV PROJECT_ROOT=/php
+
+RUN set -eux; \
+    apk add --no-cache \
+      bash \
+    ; \
+    adduser -u 1000 -DSh /php php php
+
+ARG EXT_INSTALL
+ARG EXT_ENABLE=''
+RUN --mount=from=mlocati/php-extension-installer,dst=/build/extension-installer,src=/usr/bin/install-php-extensions \
+    set -eux; \
+    /build/extension-installer \
+        opcache \
+        ${EXT_INSTALL:-${EXT_ENABLE}} \
+    ; \
+    docker-php-ext-enable \
+        opcache \
+        ${EXT_ENABLE} \
+    ;
+
+RUN set eux; \
+    mkdir -p /usr/local/lib/php/vendor; \
+    echo "<?php file_exists('/php/vendor/autoload.php') and require '/php/vendor/autoload.php';" > /usr/local/lib/php/vendor/autoload.php; \
+    echo 'auto_prepend_file=vendor/autoload.php' > "$PHP_INI_DIR/conf.d/99-autoload.ini"
+
+USER php
+WORKDIR /php

docker/examples/nginx.conf

@@ -0,0 +1,12 @@
+server {
+    listen 80;
+    server_name _;
+    root /var/www/public;
+
+    location / {
+        fastcgi_pass  php:9000;
+        fastcgi_index index.php;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+        include fastcgi_params;
+    }
+}

examples/prometheus/index.php

@@ -2,8 +2,6 @@
 
 declare(strict_types=1);
 
-require __DIR__ . '/../../vendor/autoload.php';
-
 \Prometheus\Storage\Redis::setDefaultOptions(
     [
         'host' => 'redis',