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Code Issues Releases Wiki Activity

Browser-storage: Handle quota exceeded error

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This commit is contained in:
Jermolene 2019-02-03 17:29:32 +00:00
parent e31c5563ff
commit 6f5f9ca2fb
3 changed files with 23 additions and 5 deletions
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2
plugins/tiddlywiki/browser-storage/rawmarkup.js
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@ -28,7 +28,6 @@ function hookBootTiddlersLoaded() {
for(var index=0; index<window.localStorage.length; index++) {
var key = window.localStorage.key(index),
parts = key.split("#");
console.log("key",key)
// If it's ours
if(parts[0] === "tw5" && parts[1] === url) {
// Read it as JSON
@ -45,7 +44,6 @@ console.log("key",key)
// Get any existing tiddler
var title = incomingTiddler.fields.title,
existingTiddler = $tw.wiki.getTiddler(title);
console.log("Existing",title,existingTiddler,existingTiddler && existingTiddler.isEqual(incomingTiddler))
if(existingTiddler && existingTiddler.isEqual(incomingTiddler)) {
// If the incoming tiddler is the same as the existing then we can delete the local storage version
window.localStorage.removeItem(key);

4
plugins/tiddlywiki/browser-storage/readme.tid
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@ -13,6 +13,8 @@ Browser local storage is not a panacea for TiddlyWiki:
Please use this plugin with caution. There are a number of unresolved issues and open questions:
* An "red screen of embarrassment" error is raised when local storage is full
* A somewhat user hostile error is raised when local storage is full
* Innerwikis read the local storage of their parent wikis
* This plugin does not interfere with the existing saver mechanism, so you'll still get warnings when refreshing the page, even if your changes are safely committed to local storage
* Deleted tiddlers will be restored when the wiki is refreshed

22
plugins/tiddlywiki/browser-storage/startup.js
View File

@ -21,14 +21,32 @@ exports.synchronous = true;
exports.startup = function() {
// Compute our prefix for local storage keys
var url = window.location.protocol === "file:" ? window.location.pathname : "",
prefix = "tw5#" + url + "#"
prefix = "tw5#" + url + "#";
// Make a logger
var logger = new $tw.utils.Logger("browser-storage",{
colour: "cyan"
});
// Track tiddler changes
$tw.wiki.addEventListener("change",function(changes) {
$tw.utils.each(changes,function(change,title) {
// Get the tiddler
var tiddler = $tw.wiki.getTiddler(title);
if(tiddler) {
// Get the JSON of the tiddler
var json = JSON.stringify(tiddler.getFieldStrings());
window.localStorage.setItem(prefix + title,json);
// Try to save it to local storage
try {
window.localStorage.setItem(prefix + title,json);
} catch(e) {
if(e.name === "QuotaExceededError") {
// Complain if we failed
logger.alert("Quota exceeded trying to store '" + title + "' in browser local storage");
// No point in keeping old values around for this tiddler
window.localStorage.removeItem(prefix + title);
} else {
throw e;
}
}
console.log("browser-storage: Saving",title);
} else {
window.localStorage.removeItem(prefix + title);