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# These comments let tutorial-asyncio.rst include this code in sections.
# -- setup-start --
from aiohttp import web
from motor.motor_asyncio import AsyncIOMotorClient
async def setup_db():
db = AsyncIOMotorClient().test
await db.pages.drop()
html = "<html><body>{}</body></html>"
await db.pages.insert_one({"_id": "page-one", "body": html.format("Hello!")})
await db.pages.insert_one({"_id": "page-two", "body": html.format("Goodbye.")})
return db
# -- setup-end --
# -- handler-start --
async def page_handler(request):
# If the visitor gets "/pages/page-one", then page_name is "page-one".
page_name = request.match_info.get("page_name")
# Retrieve the long-lived database handle.
db = request.app["db"]
# Find the page by its unique id.
document = await db.pages.find_one(page_name)
if not document:
return web.HTTPNotFound(text=f"No page named {page_name!r}")
return web.Response(body=document["body"].encode(), content_type="text/html")
# -- handler-end --
# -- main-start --
async def init_connection():
db = await setup_db()
app = web.Application()
app["db"] = db
# Route requests to the page_handler() coroutine.
app.router.add_get("/pages/{page_name}", page_handler)
return app
def main():
app = init_connection()
web.run_app(app)
if __name__ == "__main__":
main()
# -- main-end --
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