750 lines
20 KiB
JavaScript
750 lines
20 KiB
JavaScript
/**
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* Heartbeat API
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*
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* Heartbeat is a simple server polling API that sends XHR requests to
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* the server every 15 - 60 seconds and triggers events (or callbacks) upon
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* receiving data. Currently these 'ticks' handle transports for post locking,
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* login-expiration warnings, autosave, and related tasks while a user is logged in.
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*
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* Available PHP filters (in ajax-actions.php):
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* - heartbeat_received
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* - heartbeat_send
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* - heartbeat_tick
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* - heartbeat_nopriv_received
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* - heartbeat_nopriv_send
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* - heartbeat_nopriv_tick
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* @see wp_ajax_nopriv_heartbeat(), wp_ajax_heartbeat()
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*
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* Custom jQuery events:
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* - heartbeat-send
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* - heartbeat-tick
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* - heartbeat-error
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* - heartbeat-connection-lost
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* - heartbeat-connection-restored
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* - heartbeat-nonces-expired
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*
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* @since 3.6.0
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*/
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( function( $, window, undefined ) {
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var Heartbeat = function() {
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var $document = $(document),
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settings = {
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// Suspend/resume
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suspend: false,
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// Whether suspending is enabled
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suspendEnabled: true,
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// Current screen id, defaults to the JS global 'pagenow' when present (in the admin) or 'front'
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screenId: '',
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// XHR request URL, defaults to the JS global 'ajaxurl' when present
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url: '',
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// Timestamp, start of the last connection request
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lastTick: 0,
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// Container for the enqueued items
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queue: {},
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// Connect interval (in seconds)
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mainInterval: 60,
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// Used when the interval is set to 5 sec. temporarily
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tempInterval: 0,
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// Used when the interval is reset
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originalInterval: 0,
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// Used to limit the number of AJAX requests.
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minimalInterval: 0,
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// Used together with tempInterval
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countdown: 0,
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// Whether a connection is currently in progress
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connecting: false,
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// Whether a connection error occurred
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connectionError: false,
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// Used to track non-critical errors
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errorcount: 0,
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// Whether at least one connection has completed successfully
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hasConnected: false,
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// Whether the current browser window is in focus and the user is active
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hasFocus: true,
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// Timestamp, last time the user was active. Checked every 30 sec.
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userActivity: 0,
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// Flags whether events tracking user activity were set
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userActivityEvents: false,
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checkFocusTimer: 0,
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beatTimer: 0
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};
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/**
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* Set local vars and events, then start
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*
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* @access private
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*
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* @return void
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*/
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function initialize() {
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var options, hidden, visibilityState, visibilitychange;
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if ( typeof window.pagenow === 'string' ) {
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settings.screenId = window.pagenow;
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}
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if ( typeof window.ajaxurl === 'string' ) {
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settings.url = window.ajaxurl;
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}
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// Pull in options passed from PHP
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if ( typeof window.heartbeatSettings === 'object' ) {
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options = window.heartbeatSettings;
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// The XHR URL can be passed as option when window.ajaxurl is not set
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if ( ! settings.url && options.ajaxurl ) {
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settings.url = options.ajaxurl;
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}
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// The interval can be from 15 to 120 sec. and can be set temporarily to 5 sec.
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// It can be set in the initial options or changed later from JS and/or from PHP.
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if ( options.interval ) {
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settings.mainInterval = options.interval;
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if ( settings.mainInterval < 15 ) {
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settings.mainInterval = 15;
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} else if ( settings.mainInterval > 120 ) {
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settings.mainInterval = 120;
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}
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}
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// Used to limit the number of AJAX requests. Overrides all other intervals if they are shorter.
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// Needed for some hosts that cannot handle frequent requests and the user may exceed the allocated server CPU time, etc.
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// The minimal interval can be up to 600 sec. however setting it to longer than 120 sec. will limit or disable
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// some of the functionality (like post locks).
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// Once set at initialization, minimalInterval cannot be changed/overriden.
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if ( options.minimalInterval ) {
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options.minimalInterval = parseInt( options.minimalInterval, 10 );
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settings.minimalInterval = options.minimalInterval > 0 && options.minimalInterval <= 600 ? options.minimalInterval * 1000 : 0;
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}
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if ( settings.minimalInterval && settings.mainInterval < settings.minimalInterval ) {
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settings.mainInterval = settings.minimalInterval;
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}
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// 'screenId' can be added from settings on the front end where the JS global 'pagenow' is not set
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if ( ! settings.screenId ) {
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settings.screenId = options.screenId || 'front';
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}
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if ( options.suspension === 'disable' ) {
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settings.suspendEnabled = false;
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}
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}
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// Convert to milliseconds
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settings.mainInterval = settings.mainInterval * 1000;
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settings.originalInterval = settings.mainInterval;
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// Switch the interval to 120 sec. by using the Page Visibility API.
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// If the browser doesn't support it (Safari < 7, Android < 4.4, IE < 10), the interval
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// will be increased to 120 sec. after 5 min. of mouse and keyboard inactivity.
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if ( typeof document.hidden !== 'undefined' ) {
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hidden = 'hidden';
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visibilitychange = 'visibilitychange';
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visibilityState = 'visibilityState';
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} else if ( typeof document.msHidden !== 'undefined' ) { // IE10
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hidden = 'msHidden';
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visibilitychange = 'msvisibilitychange';
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visibilityState = 'msVisibilityState';
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} else if ( typeof document.webkitHidden !== 'undefined' ) { // Android
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hidden = 'webkitHidden';
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visibilitychange = 'webkitvisibilitychange';
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visibilityState = 'webkitVisibilityState';
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}
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if ( hidden ) {
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if ( document[hidden] ) {
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settings.hasFocus = false;
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}
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$document.on( visibilitychange + '.wp-heartbeat', function() {
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if ( document[visibilityState] === 'hidden' ) {
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blurred();
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window.clearInterval( settings.checkFocusTimer );
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} else {
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focused();
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if ( document.hasFocus ) {
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settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
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}
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}
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});
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}
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// Use document.hasFocus() if available.
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if ( document.hasFocus ) {
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settings.checkFocusTimer = window.setInterval( checkFocus, 10000 );
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}
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$(window).on( 'unload.wp-heartbeat', function() {
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// Don't connect any more
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settings.suspend = true;
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// Abort the last request if not completed
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if ( settings.xhr && settings.xhr.readyState !== 4 ) {
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settings.xhr.abort();
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}
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});
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// Check for user activity every 30 seconds.
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window.setInterval( checkUserActivity, 30000 );
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// Start one tick after DOM ready
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$document.ready( function() {
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settings.lastTick = time();
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scheduleNextTick();
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});
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}
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/**
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* Return the current time according to the browser
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*
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* @access private
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*
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* @return int
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*/
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function time() {
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return (new Date()).getTime();
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}
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/**
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* Check if the iframe is from the same origin
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*
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* @access private
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*
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* @return bool
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*/
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function isLocalFrame( frame ) {
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var origin, src = frame.src;
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// Need to compare strings as WebKit doesn't throw JS errors when iframes have different origin.
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// It throws uncatchable exceptions.
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if ( src && /^https?:\/\//.test( src ) ) {
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origin = window.location.origin ? window.location.origin : window.location.protocol + '//' + window.location.host;
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if ( src.indexOf( origin ) !== 0 ) {
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return false;
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}
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}
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try {
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if ( frame.contentWindow.document ) {
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return true;
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}
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} catch(e) {}
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return false;
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}
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/**
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* Check if the document's focus has changed
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*
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* @access private
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*
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* @return void
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*/
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function checkFocus() {
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if ( settings.hasFocus && ! document.hasFocus() ) {
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blurred();
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} else if ( ! settings.hasFocus && document.hasFocus() ) {
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focused();
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}
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}
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/**
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* Set error state and fire an event on XHR errors or timeout
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*
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* @access private
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*
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* @param string error The error type passed from the XHR
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* @param int status The HTTP status code passed from jqXHR (200, 404, 500, etc.)
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* @return void
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*/
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function setErrorState( error, status ) {
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var trigger;
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if ( error ) {
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switch ( error ) {
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case 'abort':
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// do nothing
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break;
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case 'timeout':
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// no response for 30 sec.
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trigger = true;
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break;
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case 'error':
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if ( 503 === status && settings.hasConnected ) {
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trigger = true;
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break;
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}
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/* falls through */
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case 'parsererror':
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case 'empty':
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case 'unknown':
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settings.errorcount++;
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if ( settings.errorcount > 2 && settings.hasConnected ) {
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trigger = true;
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}
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break;
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}
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if ( trigger && ! hasConnectionError() ) {
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settings.connectionError = true;
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$document.trigger( 'heartbeat-connection-lost', [error, status] );
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}
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}
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}
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/**
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* Clear the error state and fire an event
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*
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* @access private
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*
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* @return void
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*/
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function clearErrorState() {
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// Has connected successfully
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settings.hasConnected = true;
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if ( hasConnectionError() ) {
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settings.errorcount = 0;
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settings.connectionError = false;
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$document.trigger( 'heartbeat-connection-restored' );
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}
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}
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/**
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* Gather the data and connect to the server
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*
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* @access private
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*
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* @return void
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*/
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function connect() {
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var ajaxData, heartbeatData;
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// If the connection to the server is slower than the interval,
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// heartbeat connects as soon as the previous connection's response is received.
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if ( settings.connecting || settings.suspend ) {
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return;
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}
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settings.lastTick = time();
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heartbeatData = $.extend( {}, settings.queue );
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// Clear the data queue, anything added after this point will be send on the next tick
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settings.queue = {};
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$document.trigger( 'heartbeat-send', [ heartbeatData ] );
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ajaxData = {
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data: heartbeatData,
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interval: settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000,
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_nonce: typeof window.heartbeatSettings === 'object' ? window.heartbeatSettings.nonce : '',
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action: 'heartbeat',
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screen_id: settings.screenId,
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has_focus: settings.hasFocus
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};
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settings.connecting = true;
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settings.xhr = $.ajax({
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url: settings.url,
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type: 'post',
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timeout: 30000, // throw an error if not completed after 30 sec.
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data: ajaxData,
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dataType: 'json'
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}).always( function() {
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settings.connecting = false;
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scheduleNextTick();
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}).done( function( response, textStatus, jqXHR ) {
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var newInterval;
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if ( ! response ) {
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setErrorState( 'empty' );
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return;
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}
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clearErrorState();
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if ( response.nonces_expired ) {
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$document.trigger( 'heartbeat-nonces-expired' );
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}
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// Change the interval from PHP
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if ( response.heartbeat_interval ) {
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newInterval = response.heartbeat_interval;
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delete response.heartbeat_interval;
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}
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$document.trigger( 'heartbeat-tick', [response, textStatus, jqXHR] );
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// Do this last, can trigger the next XHR if connection time > 5 sec. and newInterval == 'fast'
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if ( newInterval ) {
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interval( newInterval );
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}
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}).fail( function( jqXHR, textStatus, error ) {
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setErrorState( textStatus || 'unknown', jqXHR.status );
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$document.trigger( 'heartbeat-error', [jqXHR, textStatus, error] );
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});
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}
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/**
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* Schedule the next connection
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*
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* Fires immediately if the connection time is longer than the interval.
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*
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* @access private
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*
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* @return void
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*/
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function scheduleNextTick() {
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var delta = time() - settings.lastTick,
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interval = settings.mainInterval;
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if ( settings.suspend ) {
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return;
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}
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if ( ! settings.hasFocus ) {
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interval = 120000; // 120 sec. Post locks expire after 150 sec.
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} else if ( settings.countdown > 0 && settings.tempInterval ) {
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interval = settings.tempInterval;
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settings.countdown--;
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if ( settings.countdown < 1 ) {
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settings.tempInterval = 0;
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}
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}
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if ( settings.minimalInterval && interval < settings.minimalInterval ) {
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interval = settings.minimalInterval;
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}
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window.clearTimeout( settings.beatTimer );
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if ( delta < interval ) {
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settings.beatTimer = window.setTimeout(
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function() {
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connect();
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},
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interval - delta
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);
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} else {
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connect();
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}
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}
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/**
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* Set the internal state when the browser window becomes hidden or loses focus
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*
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* @access private
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*
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* @return void
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*/
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function blurred() {
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settings.hasFocus = false;
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}
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/**
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* Set the internal state when the browser window becomes visible or is in focus
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*
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* @access private
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*
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* @return void
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*/
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function focused() {
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settings.userActivity = time();
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// Resume if suspended
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settings.suspend = false;
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if ( ! settings.hasFocus ) {
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settings.hasFocus = true;
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scheduleNextTick();
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}
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}
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/**
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* Runs when the user becomes active after a period of inactivity
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*
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* @access private
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*
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* @return void
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*/
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function userIsActive() {
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settings.userActivityEvents = false;
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$document.off( '.wp-heartbeat-active' );
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$('iframe').each( function( i, frame ) {
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if ( isLocalFrame( frame ) ) {
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$( frame.contentWindow ).off( '.wp-heartbeat-active' );
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}
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});
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focused();
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}
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/**
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* Check for user activity
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*
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* Runs every 30 sec.
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* Sets 'hasFocus = true' if user is active and the window is in the background.
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* Set 'hasFocus = false' if the user has been inactive (no mouse or keyboard activity)
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* for 5 min. even when the window has focus.
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*
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* @access private
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*
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* @return void
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*/
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function checkUserActivity() {
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var lastActive = settings.userActivity ? time() - settings.userActivity : 0;
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// Throttle down when no mouse or keyboard activity for 5 min.
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if ( lastActive > 300000 && settings.hasFocus ) {
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blurred();
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}
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// Suspend after 10 min. of inactivity when suspending is enabled.
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// Always suspend after 60 min. of inactivity. This will release the post lock, etc.
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if ( ( settings.suspendEnabled && lastActive > 600000 ) || lastActive > 3600000 ) {
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settings.suspend = true;
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}
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if ( ! settings.userActivityEvents ) {
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$document.on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active', function() {
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userIsActive();
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});
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$('iframe').each( function( i, frame ) {
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if ( isLocalFrame( frame ) ) {
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$( frame.contentWindow ).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active touchend.wp-heartbeat-active', function() {
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userIsActive();
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});
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}
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});
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settings.userActivityEvents = true;
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}
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}
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// Public methods
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/**
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* Whether the window (or any local iframe in it) has focus, or the user is active
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*
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* @return bool
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*/
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function hasFocus() {
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return settings.hasFocus;
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}
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/**
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* Whether there is a connection error
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*
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* @return bool
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*/
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function hasConnectionError() {
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return settings.connectionError;
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}
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/**
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* Connect asap regardless of 'hasFocus'
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*
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* Will not open two concurrent connections. If a connection is in progress,
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* will connect again immediately after the current connection completes.
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*
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* @return void
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*/
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function connectNow() {
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settings.lastTick = 0;
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scheduleNextTick();
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}
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/**
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* Disable suspending
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*
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* Should be used only when Heartbeat is performing critical tasks like autosave, post-locking, etc.
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* Using this on many screens may overload the user's hosting account if several
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* browser windows/tabs are left open for a long time.
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*
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* @return void
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*/
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function disableSuspend() {
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settings.suspendEnabled = false;
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}
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/**
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* Get/Set the interval
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*
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* When setting to 'fast' or 5, by default interval is 5 sec. for the next 30 ticks (for 2 min and 30 sec).
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|
* In this case the number of 'ticks' can be passed as second argument.
|
|
* If the window doesn't have focus, the interval slows down to 2 min.
|
|
*
|
|
* @param mixed speed Interval: 'fast' or 5, 15, 30, 60, 120
|
|
* @param string ticks Used with speed = 'fast' or 5, how many ticks before the interval reverts back
|
|
* @return int Current interval in seconds
|
|
*/
|
|
function interval( speed, ticks ) {
|
|
var newInterval,
|
|
oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval;
|
|
|
|
if ( speed ) {
|
|
switch ( speed ) {
|
|
case 'fast':
|
|
case 5:
|
|
newInterval = 5000;
|
|
break;
|
|
case 15:
|
|
newInterval = 15000;
|
|
break;
|
|
case 30:
|
|
newInterval = 30000;
|
|
break;
|
|
case 60:
|
|
newInterval = 60000;
|
|
break;
|
|
case 120:
|
|
newInterval = 120000;
|
|
break;
|
|
case 'long-polling':
|
|
// Allow long polling, (experimental)
|
|
settings.mainInterval = 0;
|
|
return 0;
|
|
default:
|
|
newInterval = settings.originalInterval;
|
|
}
|
|
|
|
if ( settings.minimalInterval && newInterval < settings.minimalInterval ) {
|
|
newInterval = settings.minimalInterval;
|
|
}
|
|
|
|
if ( 5000 === newInterval ) {
|
|
ticks = parseInt( ticks, 10 ) || 30;
|
|
ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
|
|
|
|
settings.countdown = ticks;
|
|
settings.tempInterval = newInterval;
|
|
} else {
|
|
settings.countdown = 0;
|
|
settings.tempInterval = 0;
|
|
settings.mainInterval = newInterval;
|
|
}
|
|
|
|
// Change the next connection time if new interval has been set.
|
|
// Will connect immediately if the time since the last connection
|
|
// is greater than the new interval.
|
|
if ( newInterval !== oldInterval ) {
|
|
scheduleNextTick();
|
|
}
|
|
}
|
|
|
|
return settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000;
|
|
}
|
|
|
|
/**
|
|
* Enqueue data to send with the next XHR
|
|
*
|
|
* As the data is send asynchronously, this function doesn't return the XHR response.
|
|
* To see the response, use the custom jQuery event 'heartbeat-tick' on the document, example:
|
|
* $(document).on( 'heartbeat-tick.myname', function( event, data, textStatus, jqXHR ) {
|
|
* // code
|
|
* });
|
|
* If the same 'handle' is used more than once, the data is not overwritten when the third argument is 'true'.
|
|
* Use wp.heartbeat.isQueued('handle') to see if any data is already queued for that handle.
|
|
*
|
|
* $param string handle Unique handle for the data. The handle is used in PHP to receive the data.
|
|
* $param mixed data The data to send.
|
|
* $param bool noOverwrite Whether to overwrite existing data in the queue.
|
|
* $return bool Whether the data was queued or not.
|
|
*/
|
|
function enqueue( handle, data, noOverwrite ) {
|
|
if ( handle ) {
|
|
if ( noOverwrite && this.isQueued( handle ) ) {
|
|
return false;
|
|
}
|
|
|
|
settings.queue[handle] = data;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Check if data with a particular handle is queued
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return bool Whether some data is queued with this handle
|
|
*/
|
|
function isQueued( handle ) {
|
|
if ( handle ) {
|
|
return settings.queue.hasOwnProperty( handle );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove data with a particular handle from the queue
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return void
|
|
*/
|
|
function dequeue( handle ) {
|
|
if ( handle ) {
|
|
delete settings.queue[handle];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get data that was enqueued with a particular handle
|
|
*
|
|
* $param string handle The handle for the data
|
|
* $return mixed The data or undefined
|
|
*/
|
|
function getQueuedItem( handle ) {
|
|
if ( handle ) {
|
|
return this.isQueued( handle ) ? settings.queue[handle] : undefined;
|
|
}
|
|
}
|
|
|
|
initialize();
|
|
|
|
// Expose public methods
|
|
return {
|
|
hasFocus: hasFocus,
|
|
connectNow: connectNow,
|
|
disableSuspend: disableSuspend,
|
|
interval: interval,
|
|
hasConnectionError: hasConnectionError,
|
|
enqueue: enqueue,
|
|
dequeue: dequeue,
|
|
isQueued: isQueued,
|
|
getQueuedItem: getQueuedItem
|
|
};
|
|
};
|
|
|
|
// Ensure the global `wp` object exists.
|
|
window.wp = window.wp || {};
|
|
window.wp.heartbeat = new Heartbeat();
|
|
|
|
}( jQuery, window ));
|