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provide small wrapper around server side events and provide a fallback for IE

This commit is contained in:
Robin Appelman 2012-01-30 20:19:51 +01:00
parent 5574b87e9b
commit 45038af948
3 changed files with 168 additions and 0 deletions
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94
core/js/eventsource.js Normal file
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@ -0,0 +1,94 @@
/**
* ownCloud
*
* @author Robin Appelman
* @copyright 2012 Robin Appelman icewind1991@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* wrapper for server side events (http://en.wikipedia.org/wiki/Server-sent_events)
* includes a fallback for older browsers and IE
*
* use server side events with causion, to many open requests can hang the server
*/
OC.EventSource=function(src){
if(!this.useFallBack && typeof EventSource !='undefined'){
this.source=new EventSource(src);
this.source.onmessage=function(e){
for(var i=0;i<this.typelessListeners.length;i++){
this.typelessListeners[i](JSON.parse(e.data));
}
}
}else{
iframeId='oc_eventsource_iframe_'+OC.EventSource.iframeCount;
OC.EventSource.fallBackSources[OC.EventSource.iframeCount]=this;
this.iframe=$('<iframe/>');
this.iframe.attr('id',iframeId);
this.iframe.hide();
this.iframe.attr('src',src+'?fallback=true&fallback_id='+OC.EventSource.iframeCount);
$('body').append(this.iframe);
this.useFallBack=true;
OC.EventSource.iframeCount++
}
}
OC.EventSource.fallBackSources=[];
OC.EventSource.iframeCount=0;//number of fallback iframes
OC.EventSource.fallBackCallBack=function(id,type,data){
OC.EventSource.fallBackSources[id].fallBackCallBack(type,JSON.parse(data));
}
OC.EventSource.prototype={
typelessListeners:[],
iframe:null,
listeners:{},//only for fallback
useFallBack:false,
fallBackCallBack:function(type,data){
if(type){
for(var i=0;i<this.listeners[type].length;i++){
this.listeners[type][i](data);
}
}else{
for(var i=0;i<this.typelessListeners.length;i++){
this.typelessListeners[i](data);
}
}
},
lastLength:0,//for fallback
listen:function(type,callback){
if(callback && callback.call){
if(type){
if(this.useFallBack){
if(!this.listeners[type]){
this.listeners[type]=[];
}
this.listeners[type].push(callback);
}else{
this.source.addEventListener(type,function(e){
callback(JSON.parse(e.data));
},false);
}
}else{
typelessListeners.push(callback);
}
}
},
close:function(){
this.source.close();
}
}

1
lib/base.php
View File

@ -187,6 +187,7 @@ class OC{
OC_Util::addScript( "jquery.infieldlabel.min" );
OC_Util::addScript( "jquery-tipsy" );
OC_Util::addScript( "js" );
OC_Util::addScript( "eventsource" );
//OC_Util::addScript( "multiselect" );
OC_Util::addScript('search','result');
OC_Util::addStyle( "styles" );

73
lib/eventsource.php Normal file
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@ -0,0 +1,73 @@
<?php
/**
* ownCloud
*
* @author Robin Appelman
* @copyright 2012 Robin Appelman icewind1991@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* wrapper for server side events (http://en.wikipedia.org/wiki/Server-sent_events)
* includes a fallback for older browsers and IE
*
* use server side events with causion, to many open requests can hang the server
*/
class OC_EventSource{
private $fallback;
private $fallBackId=0;
public function __construct(){
ob_end_clean();
header('Cache-Control: no-cache');
$this->fallback=isset($_GET['fallback']) and $_GET['fallback']=='true';
if($this->fallback){
$fallBackId=$_GET['fallback_id'];
header("Content-Type: text/html");
echo str_repeat('<span></span>'.PHP_EOL,10); //dummy data to keep IE happy
}else{
header("Content-Type: text/event-stream");
}
flush();
}
/**
* send a message to the client
* @param string type
* @param object data
*
* if only one paramater is given, a typeless message will be send with that paramater as data
*/
public function send($type,$data=null){
if(is_null($data)){
$data=$type;
$type=null;
}
if($this->fallback){
$response='<script type="text/javascript">window.parent.OC.EventSource.fallBackCallBack('.$this->fallBackId.',"'.$type.'","'.json_encode($data).'")</script>'.PHP_EOL;
echo $response;
}else{
if($type){
echo 'event: '.$type.PHP_EOL;
}
echo 'data: '.json_encode($data).PHP_EOL;
}
echo PHP_EOL;
flush();
}
}