1 |
dpavlin |
2 |
#!/usr/bin/perl |
2 |
|
|
|
3 |
|
|
# "HTTP Push" is not readily attainable, so instead we will simulate it using a |
4 |
|
|
# long-pull, aka "Comet". The client browser simply opens an HTTP connection to |
5 |
|
|
# the server and waits for a response. The server doesn't respond until there |
6 |
|
|
# is some event (here a new message), giving the appearance of HTTP-push. |
7 |
|
|
# |
8 |
|
|
# Each user gets three continuations for these three cases: |
9 |
|
|
# |
10 |
|
|
# - Initial load or reload of the page |
11 |
|
|
# - Sending a message (uses AJAX on the client) |
12 |
|
|
# - Recieving messages (uses COMET on the client) |
13 |
|
|
|
14 |
|
|
use strict; |
15 |
|
|
use lib 'lib'; |
16 |
|
|
use Continuity; |
17 |
|
|
use Continuity::REPL; |
18 |
|
|
use Data::Dump qw/dump/; |
19 |
|
|
|
20 |
|
|
use View; |
21 |
|
|
|
22 |
|
|
use Template::Declare; |
23 |
|
|
use Template::Declare::Tags; # defaults to 'HTML' |
24 |
|
|
Template::Declare->init( roots => ['View']); |
25 |
|
|
warn "templates = ",dump( Template::Declare->templates ); |
26 |
|
|
|
27 |
|
|
my @messages; # Global (shared) list of messages |
28 |
|
|
my $got_message; # Flag to indicate that there is a new message to display |
29 |
|
|
|
30 |
|
|
use vars qw( $repl $server @messages ); |
31 |
|
|
$repl = Continuity::REPL->new; |
32 |
|
|
|
33 |
|
|
$server = Continuity->new( |
34 |
|
|
port => 16001, |
35 |
|
|
path_session => 1, |
36 |
|
|
cookie_session => 'sid', |
37 |
|
|
); |
38 |
|
|
$server->debug_level( 2 ); |
39 |
|
|
|
40 |
|
|
$server->loop; |
41 |
|
|
|
42 |
|
|
# This is the main entrypoint. We are looking for one of three things -- a |
43 |
|
|
# pushstream, a sent message, or a request for the main HTML. We delegate each |
44 |
|
|
# of these cases, none of which will return (they all loop forever). |
45 |
|
|
sub main { |
46 |
|
|
my ($req) = @_; |
47 |
|
|
|
48 |
|
|
my $path = $req->request->url->path; |
49 |
|
|
print STDERR "Path: '$path'\n"; |
50 |
|
|
|
51 |
|
|
warn $req->request->header('User_Agent'); |
52 |
|
|
#warn dump( $req ); |
53 |
|
|
|
54 |
|
|
# If this is a request for the pushtream, then give them that |
55 |
|
|
if($path =~ /pushstream/) { |
56 |
|
|
pushstream($req); |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
# If they are sending us a message, we give them a thread for that too |
60 |
|
|
if($path =~ /sendmessage/) { |
61 |
|
|
send_message($req); |
62 |
|
|
} |
63 |
|
|
|
64 |
|
|
# Otherwise, lets give them the base page |
65 |
|
|
send_base_page($req); |
66 |
|
|
} |
67 |
|
|
|
68 |
|
|
# Here we accept a connection to the browser, and keep it open. Meanwhile we |
69 |
|
|
# watch the global $got_message variable, and when it gets touched we send off |
70 |
|
|
# the list of messages through the held-open connection. Then we let the |
71 |
|
|
# browser open a new connection and begin again. |
72 |
|
|
sub pushstream { |
73 |
|
|
my ($req) = @_; |
74 |
|
|
# Set up watch event -- this will be triggered when $got_message is written |
75 |
|
|
my $w = Coro::Event->var(var => \$got_message, poll => 'w'); |
76 |
|
|
while(1) { |
77 |
|
|
print STDERR "**** GOT MESSAGE, SENDING ****\n"; |
78 |
|
|
my $log = join "<br>", @messages; |
79 |
|
|
$req->print($log); |
80 |
|
|
$req->next; |
81 |
|
|
print STDERR "**** Waiting for got_message indicator ****\n"; |
82 |
|
|
$w->next; |
83 |
|
|
} |
84 |
|
|
} |
85 |
|
|
|
86 |
|
|
|
87 |
|
|
# Watch for the user to send us a message. As soon as we get it, we add it to |
88 |
|
|
# our list of messages and touch the $got_message flag to let all the |
89 |
|
|
# pushstreams know. |
90 |
|
|
sub send_message { |
91 |
|
|
my ($req) = @_; |
92 |
|
|
while(1) { |
93 |
|
|
my $msg = $req->param('message'); |
94 |
|
|
my $name = $req->param('username'); |
95 |
|
|
if($msg) { |
96 |
|
|
unshift @messages, "$name: $msg"; |
97 |
|
|
pop @messages if $#messages > 15; # Only keep the recent 15 messages |
98 |
|
|
} |
99 |
|
|
$got_message = 1; |
100 |
|
|
$req->print("Got it!"); |
101 |
|
|
$req->next; |
102 |
|
|
} |
103 |
|
|
} |
104 |
|
|
|
105 |
|
|
# This isn't a pushstream, nor a new message. It is just the main page. We loop |
106 |
|
|
# in case they ask for it multiple times :) |
107 |
|
|
sub send_base_page { |
108 |
|
|
my ($req) = @_; |
109 |
|
|
while(1) { |
110 |
|
|
warn "base page"; |
111 |
|
|
$req->out( Template::Declare->show( 'user' ) ); |
112 |
|
|
=for later |
113 |
|
|
$req->print(qq{ |
114 |
|
|
<html> |
115 |
|
|
<head> |
116 |
|
|
<title>Chat!</title> |
117 |
|
|
<script src="jquery.js" type="text/javascript"></script> |
118 |
|
|
<script src="chat-ajax-push.js" type="text/javascript"></script> |
119 |
|
|
</head> |
120 |
|
|
<body> |
121 |
|
|
<form id=f> |
122 |
|
|
<input type=text id=username name=usernamename size=10> |
123 |
|
|
<input type=text id=message name=message size=50> |
124 |
|
|
<input type=submit name="sendbutton" value="Send" id="sendbutton"> |
125 |
|
|
<span id=status></span> |
126 |
|
|
</form> |
127 |
|
|
<br> |
128 |
|
|
<div id=log>-- no messages yet --</div> |
129 |
|
|
</body> |
130 |
|
|
</html> |
131 |
|
|
}); |
132 |
|
|
=cut |
133 |
|
|
$req->next; |
134 |
|
|
} |
135 |
|
|
} |
136 |
|
|
|
137 |
|
|
|