Added doctrine

.env

@@ -1 +1,16 @@
-# default environment variables https://docs.docker.com/compose/env-file/
+# default environment variables https://docs.docker.com/compose/env-file/
+
+###> symfony/framework-bundle ###
+APP_ENV=dev
+APP_SECRET=f4d72215cca250696794418379c8bc98
+#TRUSTED_PROXIES=127.0.0.1,127.0.0.2
+#TRUSTED_HOSTS='^localhost|example\.com$'
+###< symfony/framework-bundle ###
+
+###> doctrine/doctrine-bundle ###
+# Format described at http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
+# For an SQLite database, use: "sqlite:///%kernel.project_dir%/var/data.db"
+# Configure your db driver and server_version in config/packages/doctrine.yaml
+DATABASE_PRIMARY_URL=mysql://root:111@172.27.0.2:3306/mydb
+DATABASE_REPLICA_URL=mysql://root:111@172.27.0.4:3306/mydb
+###< doctrine/doctrine-bundle ###

.gitignore

@@ -1,3 +1,16 @@
 .DS_Store
 .idea
 data
+
+###> symfony/framework-bundle ###
+/.env.local
+/.env.local.php
+/.env.*.local
+/public/bundles/
+/var/
+/vendor/
+###< symfony/framework-bundle ###
+
+###> symfony/web-server-bundle ###
+/.web-server-pid
+###< symfony/web-server-bundle ###

Dockerfile

@@ -0,0 +1,8 @@
+FROM php:7.2-alpine
+
+WORKDIR /app
+#RUN php ./composer.phar update
+RUN docker-php-ext-install -j$(nproc) pdo_mysql
+RUN docker-php-ext-install -j$(nproc) pcntl pdo_mysql
+EXPOSE 8000
+CMD ./bin/console server:run 0.0.0.0:8000

README.md

@@ -1,9 +1,14 @@
-Docker MySQL master-slave replication 
+Symfony Doctrine Docker MySQL master-slave replication 
 ========================
 
+A simple Symfony app that uses a primary database for writes and a replica database for reads.
 MySQL 8.0 master-slave replication with using Docker. 
 
+See the code in Doctrine DBAL [here](https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php).
+
+Forked from [vbabak](https://github.com/vbabak/docker-mysql-master-slave)
 Previous version based on MySQL 5.7 is available in [mysql5.7](https://github.com/vbabak/docker-mysql-master-slave/tree/mysql5.7) branch.
+Mixed with code from [backbeat-tech](https://github.com/backbeat-tech/doctrine-mysql-replica-demo.git)
 
 ## Run
 
@@ -76,3 +81,25 @@ docker exec -it mysql_master bash
 ```bash
 docker exec -it mysql_slave bash
 ```
+
+## URLs
+
+* http://localhost:8001/ - select query, uses replica only
+* http://localhost:8001/insert - insert query, uses primary only
+* http://localhost:8001/update/{id} - select and update queries, uses replica to fetch the data then switches to primary
+* http://localhost:8001/ping - troubleshooting, no database used
+
+## Observing logs
+
+The app logs are available in the docker-compose output (run `docker-compose logs -f app`), showing which database is being used:
+
+```
+app_1      | 2019-03-27T17:17:39+00:00 [info] Matched route "app_app_update".
+app_1      | 2019-03-27T17:17:40+00:00 [debug] SELECT t0.id AS id_1, t0.level AS level_2, t0.hash AS hash_3 FROM item t0 WHERE t0.id = ?
+app_1      | 2019-03-27T17:17:40+00:00 [debug] Used REPLICA for the previous query.
+app_1      | 2019-03-27T17:17:40+00:00 [debug] "START TRANSACTION"
+app_1      | 2019-03-27T17:17:40+00:00 [debug] UPDATE item SET level = ?, hash = ? WHERE id = ?
+app_1      | 2019-03-27T17:17:40+00:00 [debug] "COMMIT"
+app_1      | 2019-03-27T17:17:40+00:00 [debug] Used PRIMARY for the previous query.
+app_1      | [Wed Mar 27 17:17:40 2019] 172.19.0.1:60352 [200]: /update/1
+```

bin/console

@@ -0,0 +1,38 @@
+#!/usr/bin/env php
+<?php
+
+use App\Kernel;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Debug\Debug;
+
+set_time_limit(0);
+
+require dirname(__DIR__).'/vendor/autoload.php';
+
+if (!class_exists(Application::class)) {
+    throw new RuntimeException('You need to add "symfony/framework-bundle" as a Composer dependency.');
+}
+
+$input = new ArgvInput();
+if (null !== $env = $input->getParameterOption(['--env', '-e'], null, true)) {
+    putenv('APP_ENV='.$_SERVER['APP_ENV'] = $_ENV['APP_ENV'] = $env);
+}
+
+if ($input->hasParameterOption('--no-debug', true)) {
+    putenv('APP_DEBUG='.$_SERVER['APP_DEBUG'] = $_ENV['APP_DEBUG'] = '0');
+}
+
+require dirname(__DIR__).'/config/bootstrap.php';
+
+if ($_SERVER['APP_DEBUG']) {
+    umask(0000);
+
+    if (class_exists(Debug::class)) {
+        Debug::enable();
+    }
+}
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG'], dirname(__DIR__));
+$application = new Application($kernel);
+$application->run($input);

bin/entrypoint.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+./bin/console doctrine:schema:update --force
+cd app
+./bin/console server:run 0.0.0.0:8000

build.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+wget https://getcomposer.org/download/2.5.5/composer.phar
+chmod 777 composer.phar
+
 docker-compose down -v
 rm -rf ./master/data/*
 rm -rf ./slave/data/*
@@ -32,3 +35,5 @@ start_slave_cmd+='"'
 docker exec mysql_slave sh -c "$start_slave_cmd"
 
 docker exec mysql_slave sh -c "export MYSQL_PWD=111; mysql -u root -e 'SHOW SLAVE STATUS \G'"
+
+rm composer.phar

composer.json

@@ -0,0 +1,41 @@
+{
+    "require": {
+        "doctrine/doctrine-bundle": "^1.10",
+        "doctrine/orm": "^2.6",
+        "symfony/dotenv": "^4.2",
+        "symfony/flex": "^1.2",
+        "symfony/framework-bundle": "^4.2",
+        "symfony/maker-bundle": "^1.11",
+        "symfony/monolog-bundle": "^3.8",
+        "symfony/web-server-bundle": "^4.2",
+        "symfony/yaml": "^4.2"
+    },
+    "autoload": {
+      "psr-4": {
+        "App\\": "src"
+      }
+    },
+    "config": {
+        "preferred-install": {
+            "*": "dist"
+        },
+        "sort-packages": true,
+        "platform": {
+            "php": "7.1.18"
+        },
+        "allow-plugins": {
+            "symfony/flex": false
+        }
+    },
+    "scripts": {
+        "auto-scripts": {
+            "cache:clear": "symfony-cmd"
+        },
+        "post-install-cmd": [
+            "@auto-scripts"
+        ],
+        "post-update-cmd": [
+            "@auto-scripts"
+        ]
+    }
+}