#! /usr/bin/python2
# use C:\Python22\python.exe in windows
# Help at the end of the file

import cgi
import fcntl
import time
lockfile = "/tmp/.lock"


print "Content-Type: text/plain"	# HTML is following
print "Expires: 0"
print "Cache-Control: no cache"
print					# blank line, end of headers


## Open a file-descriptor for the lock file.
lockH = open(lockfile,"w")

## Try to aquire an exclusive lock on the lock file.
try:
    fcntl.flock(lockH , fcntl.LOCK_EX)		# | fcntl.LOCK_NB)
except IOError,e:
    sys.exit("Lockfile %s already locked - an instance is probably already running" % lockfile)


form = cgi.FieldStorage()
if not (form.has_key("CounterName")):
	print "0"			# "0 (no key)"
else:
	FileName="CounterData/" + form["CounterName"].value
	# Get number
	try:
		f = open(FileName,"r")
	except IOError:
		print "0"		# "0 (no file)" 
	else:
		Hits=f.read()
		Hits = str(int(Hits)+1)
		print Hits		# "(from file)"
		f.close()
	
		f = open(FileName,"w")
		f.write(Hits)
		f.close()


## Release the lock again
fcntl.flock(lockH, fcntl.LOCK_UN)


###############################################################################
# This is a simple _text based_ web counter writen in python
# It works in unix and Windows (with python installed and some modifications)
#
# Make sure the 1st line reflects where you python interpreter is located
# Place this script in your cgi-bin directory and make sure it's executable "chmod 711"
# Make a subdirectory cgi-bin/CounterData
# You need to create each counter you want with "echo 1 >cgi-bin/CounterData/PageCounter"
# You could for instance name them the same than your html pages, leaving out the ".html"
#
# Embed the counters within your pages with the following html code:
# <IFRAME CLASS=Counter SRC="/cgi-bin/Counter?CounterName=PageCounter" FRAMEBORDER=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=NO></IFRAME>
# With the Counter class defined in your .css file as
# 	.Counter { border-style:none; width:6em; height:1em; overflow:visible; }
# You can use as many counters as you want
#
# Written 2004 Guillaume Dargaud - Free use and modification
###############################################################################