#!/usr/bin/python
#
# Check the flood control under dnotify
# Scenario: the main thread watch a file, a second thread is created
#  writing 10 times a sec to that file, then after 5 seconds it stops
#  and stops modifying the file for 6 seconds.
#  the kernel monitoring should be stopped within one second in the
#  first phase and then reactivated after a few seconds in the second
#  phase.
#  Difference from flood.py is that we also monitor the directory containing
#  the flooded file, and check we still get notification events on that
#  directory when creating or removing a "b" resource in it concurrently.
import shutil
import os
import sys
import signal
import gamin
import time
import thread

threads = 0

# create a 4k block
block = '1234'
i = 0
while i < 10:
    block = block + block
    i = i + 1

def wait_ms(ms = 100):
    delay = 0.001
    delay = delay * ms
    time.sleep(delay)

def resource_update_thread(filename):
    global threads
    global block

    threads = threads + 1
#    print "%s active" % (filename)
    f = open(filename, "w")
    f.write(block)
    j = 0
    while j < 50:
        wait_ms(100)
	j = j + 1
	f.write(block)
#    print "%s quiet" % (filename)
    f.close()
    wait_ms(8000)
    threads = threads - 1
    thread.exit()

ok = 1
top = 0
top2 = 0
dbg = 0
db_expect = [ 51, 53, 54, 55, 54, 55, 53, 52 ]
expect = [gamin.GAMExists, gamin.GAMEndExist]
expect2 = [gamin.GAMExists, gamin.GAMExists, gamin.GAMEndExist,
           gamin.GAMCreated, gamin.GAMDeleted]

def debug(path, type, data):
    global dbg, db_expect, ok

#     print "Got debug %s, %s, %s" % (path, type, data)
    if path[-8:] != "temp_dir":
        print "Error got debug path unexpected %s" % (path)
	ok = 0
    # on may see one or two bursts
    if dbg == 4 and type == 53:
        dbg = 6
    if db_expect[dbg] != type:
        print "Error got debug event %d expected %d" % (type, db_expect[dbg])
	ok = 0
    dbg = dbg + 1

def callback(path, event, which):
    global top, expect, ok
#     print "Got callback: %s, %s" % (path, event)
    if event == gamin.GAMAcknowledge:
        return
    if top < 2:
	if expect[top] != event:
	    print "Error got event %d expected %d" % (event, expect[top])
	    ok = 0
    elif event != gamin.GAMChanged:
	print "Error got event %d expected %d" % (event, gamin.GAMChanged)
	ok = 0
    top = top + 1

def callback2(path, event, which):
    global top2, expect2, ok
#     print "Got callback2: %s, %s" % (path, event)
#     ignore the Changed events generated by modifying a
    if event == gamin.GAMAcknowledge:
        return
    if event == gamin.GAMChanged:
        return
    if expect2[top2] != event:
	print "Error got event %d expected %d" % (event, expect2[top2])
	ok = 0
    top2 = top2 + 1

shutil.rmtree ("temp_dir", True)
os.mkdir ("temp_dir")
f = open("temp_dir/a", "w").close()

mon = gamin.WatchMonitor()
mon._debug_object("notify", debug, 0)
mon.watch_file("temp_dir/a", callback, 0)
mon.watch_directory("temp_dir", callback2, 0)
wait_ms(100)
mon.handle_events()

thread.start_new_thread(resource_update_thread, ("temp_dir/a",))

# Modify the main directory while we are in flood
i = 0
while i < 20:
    i = i + 1
    wait_ms(100)
    mon.handle_events()
# print "created b"
f = open("temp_dir/b", "w").close()
while i < 50:
    i = i + 1
    wait_ms(100)
    mon.handle_events()
mon.handle_events()
os.unlink("temp_dir/b")
# print "deleted b"

# wait until the thread finishes, collecting events
wait_ms(100)
while threads > 0:
    mon.handle_events()
    wait_ms(100)

#print "all threads terminated, exiting ..."

mon.handle_events()
mon.stop_watch("temp_dir/a")
mon.stop_watch("temp_dir")
wait_ms(300)
mon.handle_events()
mon.disconnect()
del mon
shutil.rmtree ("temp_dir", True)

if top <= 2:
    print "Error: monitor got only %d events" % (top)
elif top >= 28:
    print "Error: event flow didn't worked properly, gor %d events" % (top)
elif top2 != 5:
    print "Error: monitor2 got %d events instead of %d" % (top2, 5)
elif dbg != 8 and gamin.has_debug_api == 1:
    print "Error: debug got %d events insteads of 8" % (dbg)
elif ok == 1:
    print "OK"