example-code-2e/concurrency/http_charserver.py

70 lines
1.6 KiB
Python

import asyncio
from aiohttp import web
from charfinder import UnicodeNameIndex
TEMPLATE = '''
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
</head>
<body>
<form action="/">
<input type="search" name="query" value="{query}">
<input type="submit" value="find">
</form>
<p>{message}</p>
<hr>
<pre>
{result}
</pre>
</body>
</html>
'''
CONTENT_TYPE = 'text/html; charset=UTF-8'
index = None # a UnicodeNameIndex instance
@asyncio.coroutine
def handle(request):
query = request.GET.get('query', '')
print('Query: {!r}'.format(query))
if query:
lines = list(index.find_descriptions(query))
res = '\n'.join(lines)
plural = 'es' if len(lines) > 1 else ''
msg = '{} match{} for {!r}'.format(len(lines), plural, query)
else:
lines = []
res = ''
msg = 'Type words describing characters, e.g. chess.'
text = TEMPLATE.format(query=query, result=res, message=msg)
return web.Response(content_type=CONTENT_TYPE, text=text)
@asyncio.coroutine
def init(loop):
app = web.Application(loop=loop)
app.router.add_route('GET', '/', handle)
server = yield from loop.create_server(app.make_handler(),
'127.0.0.1', 8080)
host = server.sockets[0].getsockname()
print('Serving on {}. Hit CTRL-C to stop.'.format(host))
def main():
loop = asyncio.get_event_loop()
loop.run_until_complete(init(loop))
loop.run_forever()
if __name__ == '__main__':
index = UnicodeNameIndex()
main()