Talking to each of the calls to count() is a single event loop, or coordinator.
This gist consists of 4 files: throttler.py - Throttler class implementation asynciothrottlingexample.py - Throttling general coroutines aiohttpthrottlingexampleclient.py - Throttling aiohttp requests aiohttpthrottlingexampleserver.py - Web server for testing aiohttpthrottlingexampleclient. The order of this output is the heart of async IO.
ASYNCIO FILE MONITOR HOW TO
To actually make this useful, you should wrap this up as a daemon or upstart script which can be run indefinitely. Example of how to implement throttling in Asyncio/Aiohttp. If you open any console window and upload a file or make any changes, you will see this printed out in your original console window. To use this, just run python watcher.py from your console. Print "Received modified event - %s." % event.src_path # Taken any action here when a file is modified. Start monitoring the fd file descriptor for read availability and invoke callback with the. Print "Received created event - %s." % event.src_path The event loop is the core of every asyncio application. You may also want to check out all available functions/classes of the module asyncio. # Take any action here when a file is first created. project or source file by following the links above each example. (event_handler, self.DIRECTORY_TO_WATCH, recursive=True)
ASYNCIO FILE MONITOR CODE
Asyncio is the standard library package with Python that aims to help you write asynchronous code by giving you an easy way to write, execute, and structure your coroutines. This tutorial will be specifically for Python 3.5+, using the latest asyncio keywords.
If there is no current event loop set in the current OS thread, the OS thread is main, and seteventloop() has not yet been called, asyncio will create a new event loop and set it as the current one. I've included a shortened version of a watcher.py script I used for just such a purpose. asyncio.geteventloop ¶ Get the current event loop. An example might be a client-facing sftp server where you may want to receive an email when a file is received. This makes it an excellent foundation to build a a small script which takes action whenever a file is received in a directory, or any of the directory's contents change. Watchdog is a handy Python package which uses the inotify Linux kernel subsystem to watch for any changes to the filesystem.