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deal with situation that storage quota on html5 localstorage is exceeded:

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- browser/user can limit quota, we then get an exception which must NOT stall EGroupware!
- we set a smaller MAX_LOGS of 200 instead of current 1000
- if currently more log items stored OR if exception.name=="QuotaExceededError" we clear whole log (trying to clear old limit of 1000 messages)
This commit is contained in:
Ralf Becker 2014-02-12 10:38:39 +00:00
parent e9a3d69e46
commit 3ec6ffe264
1 changed files with 55 additions and 20 deletions
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75
phpgwapi/js/jsapi/egw_debug.js
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@ -16,6 +16,15 @@
egw_core; egw_core;
*/ */
/**
* Log debug messages to browser console and persistent html5 localStorage
*
* localStorage is limited by a clientside quota, so we need to deal with
* situation that storing something in localStorage will throw an exception!
*
* @param {string} _app
* @param {object} _wnd
*/
egw.extend('debug', egw.MODULE_GLOBAL, function(_app, _wnd) { egw.extend('debug', egw.MODULE_GLOBAL, function(_app, _wnd) {
/** /**
@ -43,7 +52,7 @@ egw.extend('debug', egw.MODULE_GLOBAL, function(_app, _wnd) {
* *
* @type Number * @type Number
*/ */
var MAX_LOGS = 1000; var MAX_LOGS = 200;
/** /**
* Number of last old log entry = next one to overwrite * Number of last old log entry = next one to overwrite
* *
@ -93,38 +102,58 @@ egw.extend('debug', egw.MODULE_GLOBAL, function(_app, _wnd) {
{ {
window.localStorage[LASTLOG] = 0; window.localStorage[LASTLOG] = 0;
} }
// check if MAX_LOGS changed in code --> clear whole log
if (window.localStorage[LASTLOG] > MAX_LOGS)
{
clear_client_log();
}
try { try {
window.localStorage[LOG_PREFIX+window.localStorage[LASTLOG]] = JSON.stringify(data); window.localStorage[LOG_PREFIX+window.localStorage[LASTLOG]] = JSON.stringify(data);
window.localStorage[LASTLOG] = (1 + parseInt(window.localStorage[LASTLOG])) % MAX_LOGS;
} }
catch(e) { catch(e) {
// one of the args is not JSON.stringify, because it contains circular references eg. an et2 widget switch (e.name)
for(var i=0; i < data.args.length; ++i)
{ {
try { case 'QuotaExceededError': // storage quota is exceeded --> delete whole log
JSON.stringify(data.args[i]);
} clear_client_log();
catch(e) { break;
// for Class we try removing _parent and _children attributes and try again to stringify
if (data.args[i] instanceof Class) default:
// one of the args is not JSON.stringify, because it contains circular references eg. an et2 widget
for(var i=0; i < data.args.length; ++i)
{ {
data.args[i] = jQuery.extend({}, data.args[i]);
delete data.args[i]._parent;
delete data.args[i]._children;
try { try {
JSON.stringify(data.args[i]); JSON.stringify(data.args[i]);
continue; // stringify worked --> check other arguments
} }
catch(e) { catch(e) {
// ignore error and remove whole argument // for Class we try removing _parent and _children attributes and try again to stringify
if (data.args[i] instanceof Class)
{
data.args[i] = jQuery.extend({}, data.args[i]);
delete data.args[i]._parent;
delete data.args[i]._children;
try {
JSON.stringify(data.args[i]);
continue; // stringify worked --> check other arguments
}
catch(e) {
// ignore error and remove whole argument
}
}
// if above doesnt work, we remove the attribute
data.args[i] = '** removed, circular reference **';
} }
} }
// if above doesnt work, we remove the attribute
data.args[i] = '** removed, circular reference **';
}
} }
window.localStorage[LOG_PREFIX+window.localStorage[LASTLOG]] = JSON.stringify(data); try {
window.localStorage[LOG_PREFIX+window.localStorage[LASTLOG]] = JSON.stringify(data);
window.localStorage[LASTLOG] = (1 + parseInt(window.localStorage[LASTLOG])) % MAX_LOGS;
}
catch(e) {
// ignore error, if eg. localStorage exceeds quota on client
}
} }
window.localStorage[LASTLOG] = (1 + parseInt(window.localStorage[LASTLOG])) % MAX_LOGS;
} }
/** /**
@ -166,7 +195,13 @@ egw.extend('debug', egw.MODULE_GLOBAL, function(_app, _wnd) {
if (!window.localStorage) return false; if (!window.localStorage) return false;
for(var i=0; i < MAX_LOGS; ++i) max = MAX_LOGS;
// check if we have more log entries then allowed, happens if MAX_LOGS get changed in code
if (window.localStorage[LASTLOG] > MAX_LOGS)
{
max = 1000; // this should NOT be changed, if MAX_LOGS get's smaller!
}
for(var i=0; i < max; ++i)
{ {
if (typeof window.localStorage[LOG_PREFIX+i] != 'undefined') if (typeof window.localStorage[LOG_PREFIX+i] != 'undefined')
{ {