/[Frey]/trunk/lib/Frey/Server.pm
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trunk/server.pl revision 2 by dpavlin, Sat Jun 28 11:49:35 2008 UTC trunk/lib/Frey/Server.pm revision 793 by dpavlin, Wed Dec 10 17:51:29 2008 UTC
# Line 1  Line 1 
1  #!/usr/bin/perl  package Frey::Server;
2    
3  # "HTTP Push" is not readily attainable, so instead we will simulate it using a  use Moose;
4  # long-pull, aka "Comet". The client browser simply opens an HTTP connection to  extends 'Frey::Editor';
5  # the server and waits for a response. The server doesn't respond until there  with 'Frey::Config';
 # 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)  
6    
 use strict;  
 use lib 'lib';  
 use Continuity;  
 use Continuity::REPL;  
7  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
8    
9  use View;  use lib 'lib';
10    use Frey::Run;
11    
12  use Template::Declare;  has 'port' => (
13  use Template::Declare::Tags; # defaults to 'HTML'          documentation => 'port on which server listen',
14  Template::Declare->init( roots => ['View']);          is => 'ro',
15  warn "templates = ",dump( Template::Declare->templates );          isa => 'Int',
16            default => sub {
17  my @messages;    # Global (shared) list of messages                  my $self = shift;
18  my $got_message; # Flag to indicate that there is a new message to display                  $ENV{FREY_PORT} || $self->config->{port} || 16001
19            },
 use vars qw( $repl $server @messages );  
 $repl = Continuity::REPL->new;  
   
 $server = Continuity->new(  
   port => 16001,  
   path_session => 1,  
   cookie_session => 'sid',  
20  );  );
 $server->debug_level( 2 );  
21    
22  $server->loop;  has 'editor' => (
23            is => 'ro',
24            isa => 'Frey::Editor',
25            lazy => 1,
26            default => sub {
27                    Frey::Editor->new;
28            },
29    );
30    
31  # This is the main entrypoint. We are looking for one of three things -- a  =head2 request
 # pushstream, a sent message, or a request for the main HTML. We delegate each  
 # of these cases, none of which will return (they all loop forever).  
 sub main {  
   my ($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);  
   }  
32    
33    # Otherwise, lets give them the base page  This is simple dispatcher for our server. Currently it's in flux and
34    send_base_page($req);  documented only in source code.
 }  
35    
36  # Here we accept a connection to the browser, and keep it open. Meanwhile we    my $content_type = $self->request( $url, $params );
 # 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;  
   }  
 }  
37    
38    =cut
39    
40  # Watch for the user to send us a message. As soon as we get it, we add it to  sub print {
41  # our list of messages and touch the $got_message flag to let all the          my $self = shift;
42  # pushstreams know.          warn "# print ", join(' ', map { length $_ } @_ );
43  sub send_message {          $self->{_print}->( @_ );
   my ($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;  
   }  
44  }  }
45    
46  # This isn't a pushstream, nor a new message. It is just the main page. We loop  sub request {
47  # in case they ask for it multiple times :)          my ( $self, $url, $params ) = @_;
48  sub send_base_page {  
49    my ($req) = @_;          if ( my $ref = ref($url) ) {
50    while(1) {                  die "url not URI but ", dump( $url ) unless $ref =~ m{^URI};
51          warn "base page";          } else {
52          $req->out( Template::Declare->show( 'user' ) );                  $url = URI->new($url);
53  =for later          }
54      $req->print(qq{  
55        <html>          my $path = $url->path;
56          <head>          my $content_type = 'text/plain';
57            <title>Chat!</title>  
58            <script src="jquery.js" type="text/javascript"></script>          eval {
59            <script src="chat-ajax-push.js" type="text/javascript"></script>  #       {
60          </head>  
61          <body>                  if ( $path =~ m{/reload(.*)} ) {
62            <form id=f>  
63            <input type=text id=username name=usernamename size=10>                          $ENV{FREY_NO_LOG} = 1;
64            <input type=text id=message name=message size=50>                          my $cmd = "perl -c $0";
65            <input type=submit name="sendbutton" value="Send" id="sendbutton">                          warn "# check syntax with $cmd";
66            <span id=status></span>                          if ( system($cmd) == 0 ) {
67            </form>                                  my $server = Frey::Server->new;
68            <br>                                  $self->load_config;
69            <div id=log>-- no messages yet --</div>  #                               Module::Reload->check;
70          </body>                                  warn "# reload done";
71        </html>                                  $self->print( refresh( $1, 0 ) );
72      });                                  return;
73  =cut                          } else {
74      $req->next;                                  warn "ERROR: $?";
75    }                          }
76                            $ENV{FREY_NO_LOG} = 0;
77            
78                    } elsif ( $path =~ m{/exit(.*)} ) {
79                            # FIXME do we need some kind of check here for production? :-)
80                            # ./bin/dev.sh will restart us during development
81                            $self->print( refresh( $1, 2 ) );
82                            exit;
83                    }
84    
85                    my $html;
86    
87                    sub rest2class {
88                            my $class = shift;
89                            $class =~ s/-/::/; # sigh!
90                            return $class;
91                    }
92    
93                    my $f;
94    
95                    # shared run params
96                    my $run = {
97                            request_url => $url,
98    #                       debug => 1,
99                    };
100    
101                    if (
102                            $path =~ m{/Frey[:-]+ObjectBrowser}
103                    ) {
104                            $f = Frey::ObjectBrowser->new( fey_class => $params->{class} );
105    #                       $f->request( $req );
106                    } elsif (
107                            $path =~ m{/Frey[:-]+ObjectDesigner}
108                    ) {
109                            $f = Frey::ObjectDesigner->new( fey_class => $params->{class} );
110    #                       $f->request( $req );
111                    } elsif ( $path =~ $self->editor->url_regex ) {
112                            $self->print( $self->editor->command( $path ) );
113                            return;
114                    } elsif (
115                            $path =~ m{/([^/]+)/(\w*as_\w+)/?([^/]+)?}
116                    ) {
117                            my $class = rest2class $1;
118                            warn "# run $path -> $class $2";
119                            $run->{format} = $3 if $3;
120                            $run->{$_} = $params->{$_} foreach keys %$params;
121                            $f = Frey::Run->new( class => $class, params => $run, run => $2 );
122                    } elsif (
123                            $path =~ m{/([^/]+)/?$}
124                    ) {
125                            my $class = rest2class $1;
126                            warn "# introspect $class";
127                            $run->{class} ||= $class;
128                            $f = Frey::Run->new( class => 'Frey::Introspect', params => $run );
129                    } else {
130                            $f = Frey::Run->new( class => 'Frey::Class::Browser', params => $run );
131                    }
132    
133                    if ( $f ) {
134                            $f->clean_status;
135    #                       $f->add_status( { request => $req } );
136                            $f->status_parts;
137                            if ( my $html = $f->html ) {
138                                    warn "## html ",length($html)," bytes";
139                                    $self->print( $html );
140                            } else {
141                                    confess "no output from $f";
142                            }
143                    } else {
144                            confess "# can't call request on nothing!";
145                    }
146    
147                    $content_type = $f->content_type;
148            };
149    
150            if ( $@ ) {
151                    warn "SERVER ERROR: $@";
152    #               $req->conn->send_error( 404 );  # FIXME this should probably be 500, but we can't ship page with it
153                    $self->print( qq{<pre class="frey-error">$@<pre>\r\n\r\n} );
154    #               Carp::REPL::repl;
155            }
156    
157            return $content_type;
158  }  }
159    
160    sub refresh {
161            my ( $url, $time ) = @_;
162            $url  ||= '/';
163            $time ||= 0;
164            warn "# refresh $url";
165            qq|
166                    <html>
167                    <head>
168                            <META HTTP-EQUIV="Refresh" CONTENT="$time; URL=$url"></META>
169                    </head>
170                    <body>
171                            Refresh <a href="$url"><tt>$url</tt></a> in $time sec
172                    </body>
173                    </html>
174                    \n\r\n\r
175            |; # XXX newlines at end are important to flush content to browser
176    }
177    
178    1;
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