# HG changeset patch
# User Adam Chlipala <adamc@hcoop.net>
# Date 1238106410 14400
# Node ID 44f23712020d5bbd61d5eea7703edd87bc68feca
# Parent  5ff1ff38e2db24d6aebe07ac73acaaaa8e8c8453
Chat example working nicely, but without dead channel removal

diff -r 5ff1ff38e2db -r 44f23712020d include/urweb.h
--- a/include/urweb.h	Thu Mar 26 16:22:34 2009 -0400
+++ b/include/urweb.h	Thu Mar 26 18:26:50 2009 -0400
@@ -47,8 +47,8 @@
 uw_unit uw_Basis_set_client_source(uw_context, uw_Basis_int, uw_Basis_string);
 
 void uw_set_script_header(uw_context, const char*);
+const char *uw_Basis_get_settings(uw_context, uw_Basis_string);
 const char *uw_Basis_get_script(uw_context, uw_unit);
-const char *uw_Basis_get_listener(uw_context, uw_Basis_string);
 
 char *uw_Basis_htmlifyInt(uw_context, uw_Basis_int);
 char *uw_Basis_htmlifyFloat(uw_context, uw_Basis_float);
@@ -77,11 +77,13 @@
 char *uw_Basis_urlifyString(uw_context, uw_Basis_string);
 char *uw_Basis_urlifyBool(uw_context, uw_Basis_bool);
 char *uw_Basis_urlifyTime(uw_context, uw_Basis_time);
+char *uw_Basis_urlifyChannel(uw_context, uw_Basis_channel);
 
 uw_unit uw_Basis_urlifyInt_w(uw_context, uw_Basis_int);
 uw_unit uw_Basis_urlifyFloat_w(uw_context, uw_Basis_float);
 uw_unit uw_Basis_urlifyString_w(uw_context, uw_Basis_string);
 uw_unit uw_Basis_urlifyBool_w(uw_context, uw_Basis_bool);
+uw_unit uw_Basis_urlifyChannel_w(uw_context, uw_Basis_channel);
 
 uw_Basis_int uw_Basis_unurlifyInt(uw_context, char **);
 uw_Basis_float uw_Basis_unurlifyFloat(uw_context, char **);
diff -r 5ff1ff38e2db -r 44f23712020d lib/js/urweb.js
--- a/lib/js/urweb.js	Thu Mar 26 16:22:34 2009 -0400
+++ b/lib/js/urweb.js	Thu Mar 26 18:26:50 2009 -0400
@@ -257,7 +257,7 @@
       if (isok) {
         var lines = xhr.responseText.split("\n");
         if (lines.length < 2) 
-          throw "Empty message from remote server";
+          return; //throw "Empty message from remote server";
 
         for (var i = 0; i+1 < lines.length; i += 2) {
           var chn = lines[i];
@@ -285,9 +285,9 @@
         connect();
       }
       else {
-        try {
+        /*try {
           whine("Error querying remote server for messages! " + xhr.status);
-        } catch (e) { }
+        } catch (e) { }*/
       }
     }
   };
@@ -300,10 +300,17 @@
   connect();
 }
 
+var listener_started = false;
+
 function rv(chn, parse, k) {
   if (chn < 0)
     whine("Out-of-bounds channel receive");
 
+  if (!listener_started) {
+    listener_started = true;
+    listener();
+  }
+
   var ch;
 
   if (chn >= channels.length || channels[chn] == null) {
@@ -320,6 +327,10 @@
   }
 }
 
-function unesc(s) {
-  return unescape(s).replace("+", " ");
+function uf(s) {
+ return escape(s).replace(new RegExp ("/", "g"), "%2F");
 }
+
+function uu(s) {
+  return unescape(s).replace(new RegExp ("\\+", "g"), " ");
+}
diff -r 5ff1ff38e2db -r 44f23712020d src/c/urweb.c
--- a/src/c/urweb.c	Thu Mar 26 16:22:34 2009 -0400
+++ b/src/c/urweb.c	Thu Mar 26 18:26:50 2009 -0400
@@ -229,6 +229,7 @@
   if (buf_used(&c->data.used.msgs) > 0) {
     uw_really_send(sock, begin_msgs, sizeof(begin_msgs) - 1);
     uw_really_send(sock, c->data.used.msgs.start, buf_used(&c->data.used.msgs));
+    buf_reset(&c->data.used.msgs);
     close(sock);
   }
   else
@@ -382,10 +383,17 @@
 }
 
 static void uw_subscribe(channel *ch, client *c) {
-  client_list *cs = malloc(sizeof(client_list));
+  client_list *cs;
 
   pthread_mutex_lock(&ch->data.used.lock);
 
+  for (cs = ch->data.used.clients; cs; cs = cs->next)
+    if (cs->data == c) {
+      pthread_mutex_unlock(&ch->data.used.lock);
+      return;
+    }
+
+  cs = malloc(sizeof(client_list));
   cs->data = c;
   cs->next = ch->data.used.clients;
   ch->data.used.clients = cs;
@@ -838,29 +846,29 @@
     int pass;
     client *c = uw_new_client(&pass);
 
-    char *r = uw_malloc(ctx, strlen(ctx->script_header) + 65 + 3 * INTS_MAX + buf_used(&ctx->script)
-                        + strlen(ctx->url_prefix));
-    sprintf(r, "%s<script>client_id=%d;client_pass=%d;url_prefix=\"%s\";timeout=%d;%s</script>",
+    char *r = uw_malloc(ctx, strlen(ctx->script_header) + 18 + buf_used(&ctx->script));
+    sprintf(r, "%s<script>%s</script>",
             ctx->script_header,
-            (int)c->id,
-            c->data.used.pass,
-            ctx->url_prefix,
-            ctx->timeout,
             ctx->script.start);
     return r;
   }
 }
 
-const char *uw_Basis_get_listener(uw_context ctx, uw_Basis_string onload) {
+const char *uw_Basis_get_settings(uw_context ctx, uw_Basis_string onload) {
   if (ctx->script_header[0] == 0)
     return "";
-  else if (onload[0] == 0)
-    return " onload='listener()'";
   else {
-    uw_Basis_string s = uw_malloc(ctx, strlen(onload) + 22);
+    int pass;
+    client *c = uw_new_client(&pass);
 
-    sprintf(s, " onload='listener();%s'", onload);
-    return s;
+    char *r = uw_malloc(ctx, 41 + 3 * INTS_MAX + strlen(ctx->url_prefix) + strlen(onload));
+    sprintf(r, " onload='client_id=%d;client_pass=%d;url_prefix=\"%s\";timeout=%d;%s'",
+            (int)c->id,
+            c->data.used.pass,
+            ctx->url_prefix,
+            ctx->timeout,
+            onload);
+    return r;
   }
 }
 
@@ -1108,6 +1116,17 @@
   return r;
 }
 
+char *uw_Basis_urlifyChannel(uw_context ctx, uw_Basis_channel n) {
+  int len;
+  char *r;
+
+  uw_check_heap(ctx, INTS_MAX);
+  r = ctx->heap.front;
+  sprintf(r, "%lld%n", (long long)n, &len);
+  ctx->heap.front += len+1;
+  return r;
+}
+
 char *uw_Basis_urlifyFloat(uw_context ctx, uw_Basis_float n) {
   int len;
   char *r;
@@ -1163,6 +1182,16 @@
   return uw_unit_v;
 }
 
+uw_unit uw_Basis_urlifyChannel_w(uw_context ctx, uw_Basis_channel n) {
+  int len;
+
+  uw_check(ctx, INTS_MAX);
+  sprintf(ctx->page.front, "%lld%n", (long long)n, &len);
+  ctx->page.front += len;
+
+  return uw_unit_v;
+}
+
 uw_unit uw_Basis_urlifyFloat_w(uw_context ctx, uw_Basis_float n) {
   int len;
 
@@ -1916,6 +1945,9 @@
     ++ctx->n_deltas;
     ctx->deltas = realloc(ctx->deltas, sizeof(channel_delta) * ctx->n_deltas);
     cd = &ctx->deltas[ctx->n_deltas-1];
+    cd->n_subscribed = 0;
+    cd->subscribed = malloc(0);
+    buf_init(&cd->msgs, 0);
   }
    
   cd->mode = USED;
@@ -1958,7 +1990,7 @@
     } else if (c->data.used.pass != pass) {
       uw_release_channel(ch);
       uw_release_client(c);
-      uw_error(ctx, FATAL, "Wrong client password in subscription request");
+      uw_error(ctx, FATAL, "Wrong client password (%d) in subscription request", pass);
     } else {
       size_t i;
       channel_delta *cd = allocate_delta(ctx, ch);
diff -r 5ff1ff38e2db -r 44f23712020d src/jscomp.sml
--- a/src/jscomp.sml	Thu Mar 26 16:22:34 2009 -0400
+++ b/src/jscomp.sml	Thu Mar 26 18:26:50 2009 -0400
@@ -48,7 +48,7 @@
              (("Basis", "stringToInt_error"), "pi"),
              (("Basis", "urlifyInt"), "ts"),
              (("Basis", "urlifyFloat"), "ts"),
-             (("Basis", "urlifyString"), "escape"),
+             (("Basis", "urlifyString"), "uf"),
              (("Basis", "urlifyChannel"), "ts"),
              (("Basis", "recv"), "rv")]
 
@@ -345,9 +345,10 @@
                                     @ ["}"]), st)
                 end
 
-              | TFfi ("Basis", "string") => ("unesc(t[i++])", st)
+              | TFfi ("Basis", "string") => ("uu(t[i++])", st)
               | TFfi ("Basis", "int") => ("parseInt(t[i++])", st)
               | TFfi ("Basis", "float") => ("parseFloat(t[i++])", st)
+              | TFfi ("Basis", "channel") => ("parseInt(t[i++])", st)
 
               | TFfi ("Basis", "bool") => ("t[i++] == \"True\"", st)
 
@@ -806,14 +807,14 @@
                             end
 
                           | ECase (e', pes, {result, ...}) =>
-                            if closedUpto inner e andalso List.all (fn (_, e) => closedUpto inner e) pes then
+                            (*if closedUpto inner e andalso List.all (fn (_, e) => closedUpto inner e) pes then
                                 let
                                     val (e', st) = quoteExp result ((ERel 0, loc), st)
                                 in
                                     ((ELet ("js", result, e, e'), loc),
                                      st)
                                 end
-                            else
+                            else*)
                                 let
                                     val plen = length pes
 
diff -r 5ff1ff38e2db -r 44f23712020d src/monoize.sml
--- a/src/monoize.sml	Thu Mar 26 16:22:34 2009 -0400
+++ b/src/monoize.sml	Thu Mar 26 18:26:50 2009 -0400
@@ -1871,7 +1871,7 @@
                         [] => (NONE, acc)
                       | ("Onload", e, _) :: rest => (SOME e, List.revAppend (acc, rest))
                       | x :: rest => findOnload (rest, x :: acc)
-
+                                     
                 val (onload, attrs) = findOnload (attrs, [])
 
                 fun lowercaseFirst "" = ""
@@ -1972,8 +1972,8 @@
                             let
                                 val (xml, fm) = monoExp (env, st, fm) xml
                                 val xml = case extraInner of
-                                              NONE => xml
-                                            | SOME ei => (L'.EStrcat (ei, xml), loc)
+                                                   NONE => xml
+                                                 | SOME ei => (L'.EStrcat (ei, xml), loc)
                             in
                                 ((L'.EStrcat ((L'.EStrcat (tagStart, (L'.EPrim (Prim.String ">"), loc)), loc),
                                               (L'.EStrcat (xml,
@@ -2017,8 +2017,7 @@
                     end
             in
                 case tag of
-                    "body" =>
-                    let
+                    "body" => let
                         val onload = case onload of
                                          NONE => (L'.EPrim (Prim.String ""), loc)
                                        | SOME e =>
@@ -2026,10 +2025,10 @@
                                              val e = (L'.EApp (e, (L'.ERecord [], loc)), loc)
                                          in
                                              (L'.EJavaScript (L'.Attribute, e, NONE), loc)
-                                      end
+                                         end
                     in
                         normal ("body",
-                                SOME (L'.EFfiApp ("Basis", "get_listener", [onload]), loc),
+                                SOME (L'.EFfiApp ("Basis", "get_settings", [onload]), loc),
                                 SOME (L'.EFfiApp ("Basis", "get_script", [(L'.ERecord [], loc)]), loc))
                     end
 
diff -r 5ff1ff38e2db -r 44f23712020d src/rpcify.sml
--- a/src/rpcify.sml	Thu Mar 26 16:22:34 2009 -0400
+++ b/src/rpcify.sml	Thu Mar 26 18:26:50 2009 -0400
@@ -51,13 +51,12 @@
                            "query",
                            "dml",
                            "nextval",
-                           "new_channel",
+                           "channel",
                            "subscribe",
                            "send"])
 
 val csBasis = SS.addList (SS.empty,
-                          ["source",
-                           "get",
+                          ["get",
                            "set",
                            "alert",
                            "recv"])
@@ -76,15 +75,16 @@
 fun frob file =
     let
         fun sideish (basis, ssids) e =
-            case #1 e of
-                ERecord _ => false
-              | _ =>
-                U.Exp.exists {kind = fn _ => false,
-                              con = fn _ => false,
-                              exp = fn ENamed n => IS.member (ssids, n)
-                                     | EFfi ("Basis", x) => SS.member (basis, x)
-                                     | EFfiApp ("Basis", x, _) => SS.member (basis, x)
-                                     | _ => false} e
+            U.Exp.exists {kind = fn _ => false,
+                          con = fn _ => false,
+                          exp = fn ENamed n => IS.member (ssids, n)
+                                 | EFfi ("Basis", x) => SS.member (basis, x)
+                                 | EFfiApp ("Basis", x, _) => SS.member (basis, x)
+                                 | _ => false}
+                         (U.Exp.map {kind = fn x => x,
+                                     con = fn x => x,
+                                     exp = fn ERecord _ => ERecord []
+                                            | x => x} e)
 
         fun whichIds basis =
             let
@@ -156,7 +156,7 @@
                             ENamed n => (n, args)
                           | EApp (e1, e2) => getApp (e1, e2 :: args)
                           | _ => (ErrorMsg.errorAt loc "Mixed client/server code doesn't use a named function for server part";
-                                  Print.prefaces "Bad" [("e", CorePrint.p_exp CoreEnv.empty (e, ErrorMsg.dummySpan))];
+                                  (*Print.prefaces "Bad" [("e", CorePrint.p_exp CoreEnv.empty (e, ErrorMsg.dummySpan))];*)
                                   (0, []))
                     end
 
@@ -184,7 +184,7 @@
 
                         val ran =
                             case IM.find (tfuncs, n) of
-                                NONE => (Print.prefaces "BAD" [("e", CorePrint.p_exp CoreEnv.empty (e, loc))];
+                                NONE => ((*Print.prefaces "BAD" [("e", CorePrint.p_exp CoreEnv.empty (e, loc))];*)
                                          raise Fail ("Rpcify: Undetected transaction function " ^ Int.toString n))
                               | SOME (_, _, ran, _) => ran
 
diff -r 5ff1ff38e2db -r 44f23712020d tests/chat.ur
--- a/tests/chat.ur	Thu Mar 26 16:22:34 2009 -0400
+++ b/tests/chat.ur	Thu Mar 26 18:26:50 2009 -0400
@@ -1,10 +1,69 @@
+datatype log = End | Line of string * source log
+
+fun render log =
+    case log of
+        End => <xml/>
+      | Line (line, logS) => <xml>{[line]}<br/><dyn signal={renderS logS}/></xml>
+
+and renderS logS =
+    log <- signal logS;
+    return (render log)
+
 sequence s
 table t : { Id : int, Title : string, Chan : option (channel string) }
 
+fun chat id =
+    r <- oneRow (SELECT t.Title, t.Chan FROM t WHERE t.Id = {[id]});
+    ch <- (case r.T.Chan of
+               None => (ch <- channel;
+                        dml (UPDATE t SET Chan = {[Some ch]} WHERE Id = {[id]});
+                        return ch)
+             | Some ch => return ch);
+
+    newLine <- source "";
+    logHead <- source End;
+    logTail <- source logHead;
+
+    let
+        fun join () = subscribe ch
+
+        fun onload () =
+            let
+                fun listener () =
+                    s <- recv ch;
+                    oldTail <- get logTail;
+                    newTail <- source End;
+                    set oldTail (Line (s, newTail));
+                    set logTail newTail;
+                    listener ()
+            in
+                join ();
+                listener ()
+            end
+
+        fun speak line =
+            send ch line
+
+        fun doSpeak () =
+            line <- get newLine;
+            speak line
+    in
+        return <xml><body onload={onload ()}>
+          <h1>{[r.T.Title]}</h1>
+
+          <button value="Send:" onclick={doSpeak ()}/> <ctextbox source={newLine}/>
+
+          <h2>Messages</h2>
+
+          <dyn signal={renderS logHead}/>
+          
+        </body></xml>            
+    end
+
 fun list () =
     queryX (SELECT * FROM t)
     (fn r => <xml><tr>
-      <td>{[r.T.Id]}</td> <td>{[r.T.Title]}</td>
+      <td>{[r.T.Id]}</td> <td><a link={chat r.T.Id}>{[r.T.Title]}</a></td>
       <td><a link={delete r.T.Id}>[delete]</a></td>
     </tr></xml>)