hugo/livereload/hub.go

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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
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// Licensed under the Apache 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
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// http://www.apache.org/licenses/LICENSE-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)
}
}
}
}
}