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Protection against possible local storage write errors.

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This commit is contained in:
Paulo Reis 2016-07-27 16:17:16 +01:00
parent 64654257a1
commit 406175a410
1 changed files with 14 additions and 6 deletions
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18
services/web/public/coffee/main/event.coffee
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@ -4,14 +4,18 @@ define [
CACHE_KEY = "countlyEvents"
_getEventCache = () ->
eventCache = window.localStorage.getItem CACHE_KEY
eventCacheStr = window.localStorage.getItem CACHE_KEY
# Initialize as an empy object if the event cache is still empty.
if !eventCache?
window.localStorage.setItem(CACHE_KEY, "{}")
eventCache = window.localStorage.getItem CACHE_KEY
if !eventCacheStr?
eventCacheStr = "{}"
return JSON.parse eventCache
# Errors writing to localStorage may happen when quota is full or
# browser is in incognito mode. We'll return an empty object, anyway.
try
window.localStorage.setItem CACHE_KEY, eventCacheStr
return JSON.parse eventCacheStr
_eventInCache = (key) ->
curCache = _getEventCache()
@ -25,8 +29,12 @@ define [
curCache = _getEventCache()
curCache[key] = true
curCacheAsStr = JSON.stringify curCache
# Protection against issues mentioned above.
try
window.localStorage.setItem CACHE_KEY, curCacheAsStr
App.factory "event_tracking", ->
return {