Mercurial > urweb

annotate demo/chat.ur @ 1882:77cde56d41b6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Change Pthread thread creation logic to avoid Cygwin limitations with setting stack size
author Adam Chlipala <adam@chlipala.net>
date Mon, 14 Oct 2013 08:08:57 -0400
parents e6bc6bbd7a32
children
rev   line source
adamc@699 1 structure Room = Broadcast.Make(struct
adamc@699 2 type t = string
adamc@699 3 end)
adamc@699 4
adamc@699 5 sequence s
adamc@699 6 table t : { Id : int, Title : string, Room : Room.topic }
adamc@708 7 PRIMARY KEY Id
adamc@699 8
adamc@732 9 fun chat id () =
adamc@699 10 r <- oneRow (SELECT t.Title, t.Room FROM t WHERE t.Id = {[id]});
adamc@699 11 ch <- Room.subscribe r.T.Room;
adamc@699 12
adamc@699 13 newLine <- source "";
adamc@699 14 buf <- Buffer.create;
adamc@699 15
adamc@699 16 let
adamc@699 17 fun onload () =
adamc@699 18 let
adamc@699 19 fun listener () =
adamc@699 20 s <- recv ch;
adamc@699 21 Buffer.write buf s;
adamc@699 22 listener ()
adamc@699 23 in
adamc@699 24 listener ()
adamc@699 25 end
adamc@699 26
adamc@699 27 fun getRoom () =
adamc@699 28 r <- oneRow (SELECT t.Room FROM t WHERE t.Id = {[id]});
adamc@699 29 return r.T.Room
adamc@699 30
adamc@699 31 fun speak line =
adamc@699 32 room <- getRoom ();
adamc@699 33 Room.send room line
adamc@699 34
adamc@699 35 fun doSpeak () =
adamc@699 36 line <- get newLine;
adamc@699 37 set newLine "";
adamc@908 38 rpc (speak line)
adamc@699 39 in
adamc@699 40 return <xml><body onload={onload ()}>
adamc@699 41 <h1>{[r.T.Title]}</h1>
adamc@699 42
adam@1784 43 <button value="Send:" onclick={fn _ => doSpeak ()}/> <ctextbox source={newLine}/>
adamc@699 44
adamc@699 45 <h2>Messages</h2>
adamc@699 46
adamc@699 47 <dyn signal={Buffer.render buf}/>
adamc@699 48
adamc@699 49 </body></xml>
adamc@699 50 end
adamc@699 51
adamc@699 52 fun list () =
adamc@699 53 queryX' (SELECT * FROM t)
adamc@699 54 (fn r =>
adamc@699 55 count <- Room.subscribers r.T.Room;
adamc@699 56 return <xml><tr>
adamc@699 57 <td>{[r.T.Id]}</td>
adamc@732 58 <td>{[r.T.Title]}</td>
adamc@699 59 <td>{[count]}</td>
adamc@732 60 <td><form><submit action={chat r.T.Id} value="Enter"/></form></td>
adamc@732 61 <td><form><submit action={delete r.T.Id} value="Delete"/></form></td>
adamc@699 62 </tr></xml>)
adamc@699 63
adamc@732 64 and delete id () =
adamc@699 65 dml (DELETE FROM t WHERE Id = {[id]});
adamc@699 66 main ()
adamc@699 67
adamc@699 68 and main () =
adamc@699 69 let
adamc@699 70 fun create r =
adamc@699 71 id <- nextval s;
adamc@699 72 room <- Room.create;
adamc@699 73 dml (INSERT INTO t (Id, Title, Room) VALUES ({[id]}, {[r.Title]}, {[room]}));
adamc@699 74 main ()
adamc@699 75 in
adamc@699 76 ls <- list ();
adamc@699 77 return <xml><body>
adamc@699 78 <h1>Current Channels</h1>
adamc@699 79
adamc@699 80 <table>
adamc@699 81 <tr> <th>ID</th> <th>Title</th> <th>#Subscribers</th> </tr>
adamc@699 82 {ls}
adamc@699 83 </table>
adamc@699 84
adamc@699 85 <h1>New Channel</h1>
adamc@699 86
adamc@699 87 <form>
adamc@699 88 Title: <textbox{#Title}/><br/>
adamc@699 89 <submit action={create}/>
adamc@699 90 </form>
adamc@699 91 </body></xml>
adamc@699 92 end