I believe this is a bug. Please confirm what I'm thinking or correct me if
I'm wrong.
The web2py_websocket function in web2py.js takes 4 parameters (2 optional,
onopen and onclose)
web2py_websocket: function (url, onmessage, onopen, onclose) {
if("WebSocket" in window) {
var ws = new WebSocket(url);
ws.onopen = onopen ? onopen : (function () {});
ws.onmessage = onmessage;
ws.onclose = onclose ? onclose : (function () {});
return true; /* supported */
} else return false; /* not supported */
},
I used all 4 parameters but only 3 behave how I expect them except to. url,
onmessage, and onopen.
the url connects the client to the websocket, onmessage executes when a
message is sent, onopen if specified executes when the socket is opened. I
expect that onclose would execute if specified, when the socket is closed
(client disconnects). for some reason, when the client disconnects, the
function doesn't execute. I've already asked leading questions in other
threads but I think this should sum up my exact problem.
*default/home.html*
<script>
$(document).ready(function(){
var data;
$.web2py.web2py_websocket('ws://127.0.0.1:8888/realtime/home',
function(e){data=eval('('+e.data+')')},
function(){ajax('someone_online',[],'');},
function(){ajax('{{='someone_offline/%s' %
auth.user.id}}',[],'');});
});
</script>
*default.py*
@auth.requires_login()
def someone_online():
if not db(db.online_users.user_id==auth.user.id).select():
db.online_users.insert(user_id=auth.user.id)
script2="""$('#userStatus').prepend('<div>%s just came
online</div>').fadeIn('slow').slideDown('slow')""" % auth.user.full_name
websocket_send('http://127.0.0.1:8888', script2, 'somekey', 'home')
script1="""$('#usersOnline').html($('<span>%s</span>').fadeIn('slow').slideDown('slow'))"""
% len(db().select(db.online_users.user_id))
websocket_send('http://127.0.0.1:8888', script1, 'somekey', 'home')
@auth.requires_login()
def someone_offline():
db(db.online_users.user_id==request.args(0)).delete()
script2="""$('#userStatus').append('<div>%s just went
offline</div>').fadeIn('slow').slideDown('slow')""" %
db(db.auth_user.id==request.args(0)).select().first().full_name
websocket_send('http://127.0.0.1:8888', script2, 'somekey', 'home')
script1="""$('#usersOnline').html($('<span>%s</span>').fadeIn('slow').slideDown('slow'))"""
% len(db().select(db.online_users.user_id))
websocket_send('http://127.0.0.1:8888', script1, 'somekey', 'home')
Scenario for the code above. when someone opens home.html, the page will
connect to the websocket server because of the ws:// url on the page.
because the onopen parameter has been specified, that function would
execute immediately after the connection is established, which is to call
the someone_online method in default.py via ajax. the someone_online method
then via websocket_send updates the page with the statement "<user> just
came online".
This so far works just as expected.
1436999804.04:CONNECT to home
1436999804.41:MESSAGE to home:$('#userStatus').prepend('<div>saso just came
online</div>').fadeIn('slow').slideDown('slow')
1436999804.41:MESSAGE to
home:$('#usersOnline').html($('<span>2</span>').fadeIn('slow').slideDown('slow'))
The part that doesn't work is, when the page is closed, i expect that other
people who have that same page opened will get the update "<user> just went
offline". the onclose function doesn't seem to be executed at all, or at
least it doesn't do what I'm expecting. For example, when i refresh the
page, it disconnects and reconnects without sending the offline message.
1436999803.66:DISCONNECT from home
1436999804.04:CONNECT to home
1436999804.41:MESSAGE to home:$('#userStatus').prepend('<div>saso just came
online</div>').fadeIn('slow').slideDown('slow')
1436999804.41:MESSAGE to
home:$('#usersOnline').html($('<span>2</span>').fadeIn('slow').slideDown('slow'))
What I have tried:
I tried starting the websocket server with the token option -t. When this
is in play, somehow due to unregistered tokens I believe, the connection
opens and closes immediately due to this code in the websocket_messaging.py
script.
if DistributeHandler.tokens:
if not self.token in tokens or not token[self.token] is None:
self.close()
else:
tokens[self.token] = self
When the connection closes because of this code above checking for tokens,
the "onclose" function somehow executes
1436999086.05:CONNECT to home
1436999086.05:DISCONNECT from home
1436999086.57:MESSAGE to home:$('#userStatus').prepend('<div>saso just came
online</div>').fadeIn('slow').slideDown('slow')
1436999086.6:MESSAGE to
home:$('#usersOnline').html($('<span>2</span>').fadeIn('slow').slideDown('slow'))
1436999087.49:MESSAGE to home:$('#userStatus').append('<div>saso just went
offline</div>').fadeIn('slow').slideDown('slow')
1436999087.49:MESSAGE to
home:$('#usersOnline').html($('<span>1</span>').fadeIn('slow').slideDown('slow'))
but because the disconnection has already happened, other
tabs/clients/browsers that have opened the home.html page do not get
updated.
How can I get the onclose function to work as expected, or how do I achieve
what I want properly? Please help.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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