there are several questions on stackoverflow regarding tornado I still haven't found out an answer to my question I have a big text file that I wish to iterate on and send each line as a POST http request. I wish to do it async ( I need it to be fast) and then check the responses of the requests.
I have something like that
http_client = httpclient.AsyncHTTPClient()
with open(filename) as log_file:
for line in log_file:
request = httpclient.HTTPRequest(self.destination,method="POST",headers=self.headers,body=json.dumps(line))
response = http_client.fetch(request, callback=self.handle_request)
looking at tcpdump this does not do anything all I get is a serious of "Futures" object I also tried placing the fetch command in "yield" and then iterating it while using the @gen.coroutine decorator on the method. that did not help. can anyone please tell me what am I doing wrong?
thanks!
Here's how you'd use "fetch" in a coroutine:
from tornado import gen, httpclient, ioloop
filename = 'filename.txt'
destination = 'http://localhost:5000'
http_client = httpclient.AsyncHTTPClient()
@gen.coroutine
def post():
with open(filename) as log_file:
for line in log_file:
request = httpclient.HTTPRequest(destination,
body=line,
method="POST")
response = yield http_client.fetch(request)
print response
ioloop.IOLoop.current().run_sync(post)
You can test this with a little server that receives the lines and prints them:
from tornado import ioloop, web
class MyHandler(web.RequestHandler):
def post(self):
print self.request.body.rstrip()
app = web.Application([
web.URLSpec('/', MyHandler)
])
app.listen(port=5000)
ioloop.IOLoop.current().start()
First run the server code, and then the client.
If you want to post up to 10 log lines at a time in parallel, install Toro and do:
from tornado import gen, ioloop
from tornado.httpclient import AsyncHTTPClient, HTTPRequest
from toro import JoinableQueue
filename = 'tox.ini'
destination = 'http://localhost:5000'
AsyncHTTPClient.configure("tornado.simple_httpclient.SimpleAsyncHTTPClient",
max_clients=10)
http_client = AsyncHTTPClient()
q = JoinableQueue(maxsize=10)
@gen.coroutine
def read():
with open(filename) as log_file:
for line in log_file:
yield q.put(line)
@gen.coroutine
def post():
while True:
line = yield q.get()
request = HTTPRequest(destination,
body=line,
method="POST")
# Don't yield, just keep going as long as there's work in the queue.
future = http_client.fetch(request)
def done_callback(future):
q.task_done()
try:
print future.result()
except Exception as exc:
print exc
future.add_done_callback(done_callback)
# Start coroutines.
read()
post()
# Arrange to stop loop when queue is finished.
loop = ioloop.IOLoop.current()
join_future = q.join()
def done(future):
loop.stop()
join_future.add_done_callback(done)
loop.start()