I think the super simple way to get around that simply sends the file in lots of small parts/chunks. So there are going to be two parts to making this work, the front-end (website) and backend (server). For the front-end part, you can use something like Dropzone.js which has no additional dependencies and decent CSS … Read more
Twisted has its own event-driven way of running subprocesses which is (in my humble, but correct, opinion) better than the multiprocessing module. The core API is spawnProcess, but tools like ampoule provide higher-level wrappers over it. If you use spawnProcess, you will be able to handle output from subprocesses in the same way you’d handle … Read more
The problem here is that you’re using sudo when you shouldn’t be. And that’s causing pip to try to install into /usr/local/lib instead of ~/glenv/lib. (And, because you used sudo, it’s successfully doing so, but that doesn’t help you, because you’re not allowing system site-packages in your venv.) There are multiple reasons sudo pip could … Read more
It is very difficult to write code that is thread safe. With asyncronous code, you know exactly where the code will shift from one task to the next and race conditions are therefore much harder to come by. Threads consume a fair amount of data since each thread needs to have its own stack. With … Read more
Without knowing how the snippet you provided links into your internet.XXXServer or reactor.listenXXX (or XXXXEndpoint calls), its hard to make head-or-tails of it, but… First off, in normal use, a twisted protocol.Protocol‘s dataReceived would only be called by the framework itself. It would be linked to a client or server connection directly or via a … Read more
You will need to stop the reactor when the spider finishes. You can accomplish this by listening for the spider_closed signal: from twisted.internet import reactor from scrapy import log, signals from scrapy.crawler import Crawler from scrapy.settings import Settings from scrapy.xlib.pydispatch import dispatcher from testspiders.spiders.followall import FollowAllSpider def stop_reactor(): reactor.stop() dispatcher.connect(stop_reactor, signal=signals.spider_closed) spider = FollowAllSpider(domain=’scrapinghub.com’) crawler … Read more
This was asked recently on Reddit, so I’ll more or less just copy my answer over from there. I apologize for not being able to provide more links, I have <10 rep so I can only post two at a time. Twisted might work, but I don’t have a whole lot of experience with it. … Read more
To create ProxyFactory that can modify server response headers, content you could override ProxyClient.handle*() methods: from twisted.python import log from twisted.web import http, proxy class ProxyClient(proxy.ProxyClient): “””Mangle returned header, content here. Use `self.father` methods to modify request directly. “”” def handleHeader(self, key, value): # change response header here log.msg(“Header: %s: %s” % (key, value)) proxy.ProxyClient.handleHeader(self, … Read more
HTTP is inherently a “pull” protocol–i.e., a client pulls data from a server, waits around for a while and then pulls more data later. There’s actually no strictly HTTP way to “push” data to a client from a server. You have basically three options when you need to “push” to a client. (1) Do polling–use … Read more
A better version of option B. would be to replace import twisted by import pkg_resources pkg_resources.require(“Twisted==8.2.0”) import twisted which will arrange for the correct version of twisted to be imported, so long as it’s installed, and raises an exception otherwise. This is a more portable solution. This won’t work, though (nor would any other variaton … Read more