Connect to the database postgres and store requests inside the database

[refs #f34238344b71]

developing/webapp/app.rb

@@ -1,8 +1,14 @@
 require 'sinatra'
+require 'pg'
 
 set :bind, '0.0.0.0'
 set :port, 9494
 
 get '/' do
-  'Hello world!'
+  conn = PG::Connection.open(ENV['POSTGRES_HOST'], 5432, '', '', ENV['POSTGRES_DB'], 
+                             ENV['POSTGRES_USER'], ENV['POSTGRES_PASSWORD'])
+  sql = "INSERT INTO requests (ip, path, host, requested_at) VALUES ($1, $2, $3, $4)"
+  res  = conn.exec(sql, [request.ip, '/', Socket.gethostname, Time.now])
+  conn.finish
+  'Hello, World!'
 end

developing/webapp/docker-compose.yml

@@ -5,6 +5,11 @@ services:
     image: jfahrer/webapp-ruby:latest
     build:
       context: .
+    environment:
+      - POSTGRES_USER=demo
+      - POSTGRES_PASSWORD=secret
+      - POSTGRES_DB=demo
+      - POSTGRES_HOST=pg
     volumes:
       - .:/app
     ports: