Python script using pyinotify to detect changes in a working copy, and notify UWSGI to reload app. To be used along with UWSGI's "attach-daemon" option.

uwsgi-watch-wc

#! /usr/bin/python

import pyinotify, sys, os, signal, threading, time, syslog

lastEventTime = None

def iswatched(path):
    return (path.endswith(".tmpl") or path.endswith(".py"))

def callback(evt):
    if not iswatched(evt.pathname):
        return

    t = time.time()
    syslog.syslog(syslog.LOG_INFO, "[%s] Change detected in %s" % (t, evt))
    globals()['lastEventTime'] = t

class EventThread(threading.Thread):
    def run(self):
        while lastEventTime is None:
            time.sleep(.1)
        while time.time() - lastEventTime < 0.2:
            print "Waiting..."
            time.sleep(.1)

        print "Sending SIGHUP to", os.getppid()
        os.kill(os.getppid(), signal.SIGHUP)
        sys.exit(0)
    
t = EventThread()
t.setDaemon(True)
t.start()
wm = pyinotify.WatchManager()
notifier = pyinotify.Notifier(wm, default_proc_fun=callback) 
root = sys.argv[1]
for parentdir, dirs, files in os.walk(root):
    for file in files:
        if iswatched(file):
            wm.add_watch(os.path.join(parentdir, file), pyinotify.IN_CREATE | pyinotify.IN_DELETE | pyinotify.IN_MODIFY)
    for dir in dirs:
        wm.add_watch(os.path.join(parentdir, dir), pyinotify.IN_CREATE | pyinotify.IN_DELETE | pyinotify.IN_MODIFY)

wm.add_watch(root, pyinotify.IN_CREATE | pyinotify.IN_DELETE | pyinotify.IN_MODIFY)

notifier.loop()