lib/Frey/Server.pm

#!/usr/bin/perl

# "HTTP Push" is not readily attainable, so instead we will simulate it using a
# long-pull, aka "Comet". The client browser simply opens an HTTP connection to
# the server and waits for a response. The server doesn't respond until there
# is some event (here a new message), giving the appearance of HTTP-push.
#
# Each user gets three continuations for these three cases:
#
#   - Initial load or reload of the page
#   - Sending a message (uses AJAX on the client)
#   - Recieving messages (uses COMET on the client)

use strict;
use lib 'lib';
use Continuity;
use Continuity::REPL;
use Data::Dump qw/dump/;

use View;

use Template::Declare;
use Template::Declare::Tags; # defaults to 'HTML'
Template::Declare->init( roots => ['View']);
warn "templates = ",dump( Template::Declare->templates );

my @messages;    # Global (shared) list of messages
my $got_message; # Flag to indicate that there is a new message to display

use vars qw( $repl $server @messages );
$repl = Continuity::REPL->new;

$server = Continuity->new(
  port => 16001,
  path_session => 1,
  cookie_session => 'sid',
);
$server->debug_level( 2 );

$server->loop;

# This is the main entrypoint. We are looking for one of three things -- a
# pushstream, a sent message, or a request for the main HTML. We delegate each
# of these cases, none of which will return (they all loop forever).
sub main {
  my ($req) = @_;
  
  my $path = $req->request->url->path;
  print STDERR "Path: '$path'\n";

        warn $req->request->header('User_Agent');
#warn dump( $req );

  # If this is a request for the pushtream, then give them that
  if($path =~ /pushstream/) {
    pushstream($req);
  }
  
  # If they are sending us a message, we give them a thread for that too
  if($path =~ /sendmessage/) {
    send_message($req);
  }

  # Otherwise, lets give them the base page
  send_base_page($req);
}

# Here we accept a connection to the browser, and keep it open. Meanwhile we
# watch the global $got_message variable, and when it gets touched we send off
# the list of messages through the held-open connection. Then we let the
# browser open a new connection and begin again.
sub pushstream {
  my ($req) = @_;
  # Set up watch event -- this will be triggered when $got_message is written
  my $w = Coro::Event->var(var => \$got_message, poll => 'w');
  while(1) {
    print STDERR "**** GOT MESSAGE, SENDING ****\n";
    my $log = join "<br>", @messages;
    $req->print($log);
    $req->next;
    print STDERR "**** Waiting for got_message indicator ****\n";
    $w->next;
  }
}


# Watch for the user to send us a message. As soon as we get it, we add it to
# our list of messages and touch the $got_message flag to let all the
# pushstreams know.
sub send_message {
  my ($req) = @_;
  while(1) {
    my $msg = $req->param('message');
    my $name = $req->param('username');
    if($msg) {
      unshift @messages, "$name: $msg";
      pop @messages if $#messages > 15; # Only keep the recent 15 messages
    }
    $got_message = 1;
    $req->print("Got it!");
    $req->next;
  }
}

# This isn't a pushstream, nor a new message. It is just the main page. We loop
# in case they ask for it multiple times :)
sub send_base_page {
  my ($req) = @_;
  while(1) {
        warn "base page";
        $req->out( Template::Declare->show( 'user' ) );
=for later
    $req->print(qq{
      <html>
        <head>
          <title>Chat!</title>
          <script src="jquery.js" type="text/javascript"></script>
          <script src="chat-ajax-push.js" type="text/javascript"></script>
        </head>
        <body>
          <form id=f>
          <input type=text id=username name=usernamename size=10>
          <input type=text id=message name=message size=50>
          <input type=submit name="sendbutton" value="Send" id="sendbutton">
          <span id=status></span>
          </form>
          <br>
          <div id=log>-- no messages yet --</div>
        </body>
      </html>
    });
=cut
    $req->next;
  }
}


1	#!/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