Caching example using aiocache (#140)

* Keep-alive requests stay open if communicating

* time.time faster than loop.time?

* Fix flake8

* Add aiofiles to requirements.txt

* Caching example using aiocache

* Caching example using aiocache

* Added aiocache to requirements

examples/cache_example.py

@@ -0,0 +1,38 @@
+"""
+Example of caching using aiocache package. To run it you will need a Redis
+instance running in localhost:6379.
+
+Running this example you will see that the first call lasts 3 seconds and
+the rest are instant because the value is retrieved from the Redis.
+
+If you want more info about the package check
+https://github.com/argaen/aiocache
+"""
+
+import asyncio
+import aiocache
+
+from sanic import Sanic
+from sanic.response import json
+from sanic.log import log
+from aiocache import RedisCache, cached
+from aiocache.serializers import JsonSerializer
+
+app = Sanic(__name__)
+aiocache.set_defaults(cache=RedisCache)
+
+
+@cached(key="my_custom_key", serializer=JsonSerializer())
+async def expensive_call():
+    log.info("Expensive has been called")
+    await asyncio.sleep(3)
+    return {"test": True}
+
+
+@app.route("/")
+async def test(request):
+    log.info("Received GET /")
+    return json(await expensive_call())
+
+
+app.run(host="0.0.0.0", port=8000, loop=asyncio.get_event_loop())

requirements-dev.txt

@@ -2,6 +2,7 @@ httptools
 ujson
 uvloop
 aiohttp
+aiocache
 pytest
 coverage
 tox