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大数据下载tornado - Big download demo with Tornado 3.0.1 and pycurl.
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from tornado.httpclient import HTTPRequest, AsyncHTTPClient | |
import tornado.ioloop | |
import tornado.web | |
from tornado import gen | |
GB = 1024 * 1024 * 1024 | |
total_downloaded = 0 | |
def streaming_callback(chunk): | |
global total_downloaded | |
total_downloaded += len(chunk) | |
print 'downloaded', len(chunk), 'total is now', total_downloaded / float(GB), 'GB' | |
@gen.coroutine | |
def fetch(): | |
request = HTTPRequest( | |
'http://localhost:8888', streaming_callback=streaming_callback) | |
http_client = AsyncHTTPClient() | |
response = yield http_client.fetch(request) | |
print response | |
tornado.ioloop.IOLoop.instance().stop() | |
if __name__ == "__main__": | |
AsyncHTTPClient.configure("tornado.curl_httpclient.CurlAsyncHTTPClient") | |
fetch() | |
tornado.ioloop.IOLoop.instance().start() |
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import tornado.ioloop | |
import tornado.web | |
import tornado.options | |
from tornado import gen | |
GB = 1024 * 1024 * 1024 | |
body_size = 4 * GB | |
class StreamingRequestHandler(tornado.web.RequestHandler): | |
@tornado.web.asynchronous | |
@gen.coroutine | |
def get(self): | |
total_sent = 0 | |
chunk = 'a' * 1024 * 1024 | |
self.set_header('Content-Length', body_size) | |
while total_sent < body_size: | |
self.write(chunk) | |
yield gen.Task(self.flush) | |
total_sent += len(chunk) | |
print 'sent', total_sent / float(GB), 'GB' | |
self.finish() | |
if __name__ == "__main__": | |
tornado.options.parse_command_line() | |
application = tornado.web.Application([ | |
(r"/", StreamingRequestHandler), | |
]) | |
application.listen(8888) | |
tornado.ioloop.IOLoop.instance().start() |
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