#!/usr/bin/python
# js_sender.py
# --copyright-- Copyright 2009 (C) Tranzoa, Co. All rights reserved. Warranty: You're free and on your own here. This code is not necessarily up-to-date or of public quality.
# --url-- http://www.tranzoa.net/tzpython/
# --email-- pycode is the name to send to. tranzoa.com is the place to send to.
# --bodstamps--
# November 21, 2009 bar
# November 24, 2009 bar play with weird clock() function under vmware
# December 1, 2009 bar queue and handle a None at clear() time
# December 6, 2009 bar tell parent we're alive if he has a callback
# December 7, 2009 bar a way to stop it from outside
# February 16, 2010 bar extra quotes
# November 29, 2011 bar pyflake cleanup
# --eodstamps--
## \file
#
#
# Inject an IFRAME for a given URL/path in to an HTML page.
# The IFRAME constantly gets some javascript encapsulated in html from the server.
# We provide that HTML after a timeout or when js needs be sent to the browser.
#
# TODO:
#
#
import Queue
import re
import time
import tzlib
class a_js_sender(object) :
body_injection_re = re.compile(r"(\r\n"""
control_html = """
"""
control_html = tzlib.multiline_strip(control_html)
def __init__(me, url) :
me.timeout = 19
me.ihtml = me.injection_html % ( url or "" )
me.q = Queue.Queue() # js input queue
def inject_into_html(me, html) :
""" Put our IFRAME in to the given web page. """
if me.body_injection_re.search(html) :
return(me.body_injection_re.sub(me.ihtml + r"\1", html, 1))
if me.html_injection_re.search(html) :
return(me.html_injection_re.sub(me.ihtml + r"\1", html, 1))
return(html + me.ihtml)
def http_get(me) :
""" Server calls this routine to get HTML (with js included) to send to the browser. """
js = ""
t = me.timeout
st = tzlib.elapsed_time()
while True :
try :
# s = me.q.get(True, t)
s = me.q.get_nowait()
if s == None :
break; # we've been told to quit or whatever
js += s + "\r\n"
t = 0
except Queue.Empty :
if js or (tzlib.elapsed_time() - st >= t) :
break
time.sleep(0.010)
pass
htm = me.control_html % js
return(htm.strip())
def put_js(me, js) :
""" Send the given js to the browser next chance we get. """
me.q.put(js)
def clear_js(me) :
""" Forget any queued js. """
while True :
try :
me.q.get_nowait()
except Queue.Empty :
break
pass
me.put_js(None) # tell the getter to finish up now
pass # a_js_sender
## Command line help string.
help_str = """
%s
Injects an IFRAME in to a web page so the web page can be updated with .js code quickly at run time.
"""
#
#
#
if __name__ == '__main__' :
import os
import sys
import TZCommandLineAtFile
program_name = sys.argv.pop(0)
TZCommandLineAtFile.expand_at_sign_command_line_files(sys.argv)
if tzlib.array_find(sys.argv, [ "--help", "-h", "-?", "/?", ] ) >= 0 :
print help_str % ( os.path.basename(program_name), )
sys.exit(254)
me = a_js_sender("/blah.htm")
print "----------------------"
print me.inject_into_html("test page")
print "----------------------"
print "----------------------"
print me.inject_into_html("test page")
print "----------------------"
print "----------------------"
print me.inject_into_html("test page")
print "----------------------"
print "----------------------"
me.put_js("// 'parent' is the main page.\r\nx = 5;\r\n parent.pass_x_to_main_page(x);")
me.put_js("// Some more code\r\n")
print me.http_get()
print "----------------------"
#
#
#
# eof