1 files changed, 56 insertions, 0 deletions
diff --git a/livereload/hub.go b/livereload/hub.go
new file mode 100644
index 000000000..46afbcbc3
--- /dev/null
+++ b/livereload/hub.go
@@ -0,0 +1,56 @@
+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package livereload
+
+type hub struct {
+	// Registered connections.
+	connections map[*connection]bool
+
+	// Inbound messages from the connections.
+	broadcast chan []byte
+
+	// Register requests from the connections.
+	register chan *connection
+
+	// Unregister requests from connections.
+	unregister chan *connection
+}
+
+var wsHub = hub{
+	broadcast:   make(chan []byte),
+	register:    make(chan *connection),
+	unregister:  make(chan *connection),
+	connections: make(map[*connection]bool),
+}
+
+func (h *hub) run() {
+	for {
+		select {
+		case c := <-h.register:
+			h.connections[c] = true
+		case c := <-h.unregister:
+			delete(h.connections, c)
+			close(c.send)
+		case m := <-h.broadcast:
+			for c := range h.connections {
+				select {
+				case c.send <- m:
+				default:
+					delete(h.connections, c)
+					close(c.send)
+				}
+			}
+		}
+	}
+}