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776 lines
21 KiB
776 lines
21 KiB
/** |
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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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|
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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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|
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// Whether suspending is enabled |
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suspendEnabled: true, |
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|
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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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|
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// XHR request URL, defaults to the JS global 'ajaxurl' when present |
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url: '', |
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|
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// Timestamp, start of the last connection request |
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lastTick: 0, |
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|
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// Container for the enqueued items |
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queue: {}, |
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|
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// Connect interval (in seconds) |
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mainInterval: 60, |
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|
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// Used when the interval is set to 5 sec. temporarily |
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tempInterval: 0, |
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|
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// Used when the interval is reset |
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originalInterval: 0, |
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|
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// Used to limit the number of AJAX requests. |
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minimalInterval: 0, |
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|
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// Used together with tempInterval |
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countdown: 0, |
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|
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// Whether a connection is currently in progress |
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connecting: false, |
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|
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// Whether a connection error occurred |
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connectionError: false, |
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|
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// Used to track non-critical errors |
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errorcount: 0, |
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|
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// Whether at least one connection has completed successfully |
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hasConnected: false, |
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|
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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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|
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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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|
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// Flags whether events tracking user activity were set |
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userActivityEvents: false, |
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|
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checkFocusTimer: 0, |
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beatTimer: 0 |
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}; |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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/overridden. |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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$(window).on( 'unload.wp-heartbeat', function() { |
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// Don't connect any more |
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settings.suspend = true; |
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|
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// Abort the last request if not completed |
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if ( settings.xhr && settings.xhr.readyState !== 4 ) { |
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settings.xhr.abort(); |
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} |
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}); |
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|
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// Check for user activity every 30 seconds. |
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window.setInterval( checkUserActivity, 30000 ); |
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|
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// Start one tick after DOM ready |
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$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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/** |
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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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/** |
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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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|
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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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|
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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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/** |
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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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|
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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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|
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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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|
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if ( trigger && ! hasConnectionError() ) { |
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settings.connectionError = true; |
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$document.trigger( 'heartbeat-connection-lost', [error, status] ); |
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wp.hooks.doAction( 'heartbeat.connection-lost', error, status ); |
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} |
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} |
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} |
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|
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/** |
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* Clear the error state and fire an event |
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* |
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* @access private |
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* |
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* @return void |
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*/ |
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function clearErrorState() { |
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// Has connected successfully |
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settings.hasConnected = true; |
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|
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if ( hasConnectionError() ) { |
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settings.errorcount = 0; |
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settings.connectionError = false; |
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$document.trigger( 'heartbeat-connection-restored' ); |
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wp.hooks.doAction( 'heartbeat.connection-restored' ); |
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} |
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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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|
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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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|
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settings.lastTick = time(); |
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|
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heartbeatData = $.extend( {}, settings.queue ); |
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// Clear the data queue, anything added after this point will be send on the next tick |
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settings.queue = {}; |
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|
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$document.trigger( 'heartbeat-send', [ heartbeatData ] ); |
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wp.hooks.doAction( 'heartbeat.send', heartbeatData ); |
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|
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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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|
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if ( 'customize' === settings.screenId ) { |
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ajaxData.wp_customize = 'on'; |
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} |
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settings.connecting = true; |
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settings.xhr = $.ajax({ |
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url: settings.url, |
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type: 'post', |
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timeout: 30000, // throw an error if not completed after 30 sec. |
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data: ajaxData, |
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dataType: 'json' |
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}).always( function() { |
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settings.connecting = false; |
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scheduleNextTick(); |
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}).done( function( response, textStatus, jqXHR ) { |
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var newInterval; |
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|
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if ( ! response ) { |
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setErrorState( 'empty' ); |
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return; |
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} |
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clearErrorState(); |
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|
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if ( response.nonces_expired ) { |
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$document.trigger( 'heartbeat-nonces-expired' ); |
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wp.hooks.doAction( 'heartbeat.nonces-expired' ); |
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} |
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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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|
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// Update the heartbeat nonce if set. |
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if ( response.heartbeat_nonce && typeof window.heartbeatSettings === 'object' ) { |
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window.heartbeatSettings.nonce = response.heartbeat_nonce; |
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delete response.heartbeat_nonce; |
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} |
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|
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// Update the Rest API nonce if set and wp-api loaded. |
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if ( response.rest_nonce && typeof window.wpApiSettings === 'object' ) { |
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window.wpApiSettings.nonce = response.rest_nonce; |
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// This nonce is required for api-fetch through heartbeat.tick. |
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// delete response.rest_nonce; |
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} |
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|
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$document.trigger( 'heartbeat-tick', [response, textStatus, jqXHR] ); |
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wp.hooks.doAction( 'heartbeat.tick', response, textStatus, jqXHR ); |
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|
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// Do this last, can trigger the next XHR if connection time > 5 sec. and newInterval == 'fast' |
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if ( newInterval ) { |
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interval( newInterval ); |
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} |
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}).fail( function( jqXHR, textStatus, error ) { |
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setErrorState( textStatus || 'unknown', jqXHR.status ); |
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$document.trigger( 'heartbeat-error', [jqXHR, textStatus, error] ); |
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wp.hooks.doAction( 'heartbeat.error', jqXHR, textStatus, error ); |
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}); |
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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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|
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if ( settings.suspend ) { |
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return; |
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} |
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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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|
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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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|
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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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|
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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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/** |
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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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/** |
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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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|
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// Resume if suspended |
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settings.suspend = false; |
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|
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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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/** |
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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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$document.off( '.wp-heartbeat-active' ); |
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|
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$('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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/** |
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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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|
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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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|
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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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|
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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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|
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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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|
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settings.userActivityEvents = true; |
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} |
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} |
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|
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// Public methods |
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|
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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() { |
|
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. |
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* If the window doesn't have focus, the interval slows down to 2 min. |
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* |
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* @param mixed speed Interval: 'fast' or 5, 15, 30, 60, 120 |
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* @param string ticks Used with speed = 'fast' or 5, how many ticks before the interval reverts back |
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* @return int Current interval in seconds |
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*/ |
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function interval( speed, ticks ) { |
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var newInterval, |
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oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval; |
|
|
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if ( speed ) { |
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switch ( speed ) { |
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case 'fast': |
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case 5: |
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newInterval = 5000; |
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break; |
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case 15: |
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newInterval = 15000; |
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break; |
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case 30: |
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newInterval = 30000; |
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break; |
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case 60: |
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newInterval = 60000; |
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break; |
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case 120: |
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newInterval = 120000; |
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break; |
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case 'long-polling': |
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// Allow long polling, (experimental) |
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settings.mainInterval = 0; |
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return 0; |
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default: |
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newInterval = settings.originalInterval; |
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} |
|
|
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if ( settings.minimalInterval && newInterval < settings.minimalInterval ) { |
|
newInterval = settings.minimalInterval; |
|
} |
|
|
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if ( 5000 === newInterval ) { |
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ticks = parseInt( ticks, 10 ) || 30; |
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ticks = ticks < 1 || ticks > 30 ? 30 : ticks; |
|
|
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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. |
|
* |
|
* @namespace wp |
|
*/ |
|
window.wp = window.wp || {}; |
|
window.wp.heartbeat = new Heartbeat(); |
|
|
|
}( jQuery, window ));
|
|
|