adds support for mariadb database backend

bitnami/express/rootfs/app-entrypoint.sh

@@ -19,31 +19,57 @@ dependencies_up_to_date() {
 }
 
 database_tier_exists() {
-  [ ! -z "$(getent hosts mongodb)" ]
+  [ -n "$(getent hosts mongodb mariadb)" ]
+}
+
+__wait_for_db() {
+  local host=$1
+  local port=$2
+  local ip_address=$(getent hosts $1 | awk '{ print $1 }')
+
+  log "Connecting to at $host server at $ip_address"
+
+  counter=0
+  until nc -z $ip_address $port; do
+    counter=$((counter+1))
+    if [ $counter == 10 ]; then
+      log "Error: Couldn't connect to $host server."
+      return 1
+    fi
+    log "Trying to connect to $host server at $ip_address. Attempt $counter."
+    sleep 5
+  done
+  log "Connected to $host server"
 }
 
 wait_for_db() {
-  mongodb_address=$(getent hosts mongodb | awk '{ print $1 }')
-  counter=0
+  if getent hosts mongodb >/dev/null; then
+    __wait_for_db mongodb 27017
+  fi
 
-  log "Connecting to MongoDB at $mongodb_address"
+  if getent hosts mariadb >/dev/null; then
+    __wait_for_db mariadb 3306
+  fi
+}
 
-  until nc -z $mongodb_address 27017; do
-    counter=$((counter+1))
-    if [ $counter == 10 ]; then
-      log "Error: Couldn't connect to MongoDB."
-      exit 1
-    fi
-    log "Trying to connect to MongoDB at $mongodb_address. Attempt $counter."
-    sleep 5
-  done
-  log "Connected to MongoDB database"
+__setup_db() {
+  local server=$1
+  local module=$2
+  npm install $module --save
+
+  log "Adding $server example files under config/$server.js"
+  mkdir -p config/
+  cp -rn /app_template/config/$server.js config/$server.js
 }
 
 setup_db() {
-  npm install mongodb@2.1.18 --save
-  log "Adding MongoDB example files under /config/mongodb.js"
-  cp -rn /app_template/config .
+  if getent hosts mongodb >/dev/null; then
+    __setup_db mongodb mongodb@2.1.18
+  fi
+
+  if getent hosts mariadb >/dev/null; then
+    __setup_db mariadb mysql@2.12.0
+  fi
 }
 
 log () {

bitnami/express/rootfs/app_template/config/mariadb.js

@@ -0,0 +1,18 @@
+/*
+ Note: Generated by Bitnami:
+ Configuration file that shows how to use the built in MySQL database in your project.
+ Based on the examples found here: https://github.com/mysqljs/mysql
+*/
+
+var mysql = require('mysql')
+  , assert = require('assert');;
+
+// Connection URL configured in your docker-compose.yml file
+var url = process.env.DATABASE_URL;
+
+var connection = mysql.createConnection(url);
+connection.connect(function(err) {
+  assert.equal(null, err);
+  console.log("Connected correctly to MySQL server");
+  connection.end();
+});

bitnami/express/rootfs/app_template/config/mongodb.js

@@ -11,7 +11,7 @@ var MongoClient = require('mongodb').MongoClient
   , assert = require('assert');
 
 // Connection URL configured in your docker-compose.yml file
-var url = process.env.DATABASE_URL
+var url = process.env.DATABASE_URL;
 
 MongoClient.connect(url, function(err, db) {
   assert.equal(null, err);