hugo/livereload/livereload.go

// 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

import (
	"net/http"
	"strings"

	"github.com/gorilla/websocket"
)

var upgrader = &websocket.Upgrader{ReadBufferSize: 1024, WriteBufferSize: 1024}

func Handler(w http.ResponseWriter, r *http.Request) {
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		return
	}
	c := &connection{send: make(chan []byte, 256), ws: ws}
	wsHub.register <- c
	defer func() { wsHub.unregister <- c }()
	go c.writer()
	c.reader()
}

func Initialize() {
	go wsHub.run()
}

func ForceRefresh() {
	// Tell livereload a js file changed to force a hard refresh
	RefreshPath("/x.js")
}

func RefreshPath(s string) {
	// Tell livereload a file has changed - will force a hard refresh if not CSS or an image
	urlPath := strings.Replace(s, "\\", "/", -1) // If path has backslashes on Windows, make path work for URL
	wsHub.broadcast <- []byte(`{"command":"reload","path":"` + urlPath + "\"" + `,"originalPath":"","liveCSS":true,"liveImg":true}`)
}

func ServeJS(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/javascript")
	w.Write(livereloadJS)
}

var livereloadJS = []byte(`(function(){var e={},t={},n={},r={},i={},s={},o={},u={},a={};var f,l,c,h,p=[].indexOf||function(e){for(var t=0,n=this.length;t<n;t++){if(t in this&&this[t]===e)return t}return-1};e.PROTOCOL_6=f="http://livereload.com/protocols/official-6";e.PROTOCOL_7=l="http://livereload.com/protocols/official-7";e.ProtocolError=h=function(){function e(e,t){this.message="LiveReload protocol error ("+e+') after receiving data: "'+t+'".'}return e}();e.Parser=c=function(){function e(e){this.handlers=e;this.reset()}e.prototype.reset=function(){return this.protocol=null};e.prototype.process=function(e){var t,n,r,i,s;try{if(this.protocol==null){if(e.match(/^!!ver:([\d.]+)$/)){this.protocol=6}else if(r=this._parseMessage(e,["hello"])){if(!r.protocols.length){throw new h("no protocols specified in handshake message")}else if(p.call(r.protocols,l)>=0){this.protocol=7}else if(p.call(r.protocols,f)>=0){this.protocol=6}else{throw new h("no supported protocols found")}}return this.handlers.connected(this.protocol)}else if(this.protocol===6){r=JSON.parse(e);if(!r.length){throw new h("protocol 6 messages must be arrays")}t=r[0],i=r[1];if(t!=="refresh"){throw new h("unknown protocol 6 command")}return this.handlers.message({command:"reload",path:i.path,liveCSS:(s=i.apply_css_live)!=null?s:true})}else{r=this._parseMessage(e,["reload","alert"]);return this.handlers.message(r)}}catch(o){n=o;if(n instanceof h){return this.handlers.error(n)}else{throw n}}};e.prototype._parseMessage=function(e,t){var n,r,i;try{r=JSON.parse(e)}catch(s){n=s;throw new h("unparsable JSON",e)}if(!r.command){throw new h('missing "command" key',e)}if(i=r.command,p.call(t,i)<0){throw new h("invalid command '"+r.command+"', only valid commands are: "+t.join(", ")+")",e)}return r};return e}();var d,f,l,c,v,m;m=e,c=m.Parser,f=m.PROTOCOL_6,l=m.PROTOCOL_7;v="2.0.8";t.Connector=d=function(){function e(e,t,n,r){var i=this;this.options=e;this.WebSocket=t;this.Timer=n;this.handlers=r;this._uri="ws://"+this.options.host+":"+this.options.port+"/livereload";this._nextDelay=this.options.mindelay;this._connectionDesired=false;this.protocol=0;this.protocolParser=new c({connected:function(e){i.protocol=e;i._handshakeTimeout.stop();i._nextDelay=i.options.mindelay;i._disconnectionReason="broken";return i.handlers.connected(e)},error:function(e){i.handlers.error(e);return i._closeOnError()},message:function(e){return i.handlers.message(e)}});this._handshakeTimeout=new n(function(){if(!i._isSocketConnected()){return}i._disconnectionReason="handshake-timeout";return i.socket.close()});this._reconnectTimer=new n(function(){if(!i._connectionDesired){return}return i.connect()});this.connect()}e.prototype._isSocketConnected=function(){return this.socket&&this.socket.readyState===this.WebSocket.OPEN};e.prototype.connect=function(){var e=this;this._connectionDesired=true;if(this._isSocketConnected()){return}this._reconnectTimer.stop();this._disconnectionReason="cannot-connect";this.protocolParser.reset();this.handlers.connecting();this.socket=new this.WebSocket(this._uri);this.socket.onopen=function(t){return e._onopen(t)};this.socket.onclose=function(t){return e._onclose(t)};this.socket.onmessage=function(t){return e._onmessage(t)};return this.socket.onerror=function(t){return e._onerror(t)}};e.prototype.disconnect=function(){this._connectionDesired=false;this._reconnectTimer.stop();if(!this._isSocketConnected()){return}this._disconnectionReason="manual";return this.socket.close()};e.prototype._scheduleReconnection=function(){if(!this._connectionDesired){return}if(!this._reconnectTimer.running){this._reconnectTimer.start(this._nextDelay);return this._nextDelay=Math.min(this.options.maxdelay,this._nextDelay*2)}};e.prototype.sendCommand=function(e){if(this.protocol==null){return}return this._sendCommand(e)};e.prototype._sendCommand=function(e){return this.socket.send(JSON.stringify(e))};e.prototype._closeOnError=function(){this._handshakeTimeout.stop();this._disconnectionReason="error";return this.socket.close()};e.prototype._onopen=function(e){var t;this.handlers.socketConnected();