Adding demo with using redis storage (#219)

Author: achernetsky

demo/redis_storage.py

@@ -0,0 +1,42 @@
+import asyncio
+import aioredis
+import time
+
+from aiohttp import web
+from aiohttp_session import setup, get_session
+from aiohttp_session.redis_storage import RedisStorage
+
+
+async def handler(request):
+    session = await get_session(request)
+    last_visit = session['last_visit'] if 'last_visit' in session else None
+    session['last_visit'] = time.time()
+    text = 'Last visited: {}'.format(last_visit)
+    return web.Response(text=text)
+
+
+async def make_redis_pool():
+    redis_address = ('127.0.0.1', '6379')
+    return await aioredis.create_pool(
+        redis_address,
+        create_connection_timeout=1,
+    )
+
+
+def make_app():
+    loop = asyncio.get_event_loop()
+    redis_pool = loop.run_until_complete(make_redis_pool())
+    storage = RedisStorage(redis_pool)
+
+    async def dispose_redis_pool(app):
+        redis_pool.close()
+        await redis_pool.wait_closed()
+
+    app = web.Application()
+    setup(app, storage)
+    app.on_cleanup.append(dispose_redis_pool)
+    app.router.add_get('/', handler)
+    return app
+
+
+web.run_app(make_app())