indexed-db-workaround.coffee

# APPLICATION CODE (uses underscore.js)

lawnchair = new Lawnchair({}, (->))

# hackery to cope with firefox and lawnchair, indexedDB not doing asnyc validation
# so well. If indexedDB isn't available (after doing a .open() check) then remove it
# from the available adapters and re-init lawnchair with a new instance.
# see: https://github.com/brianleroux/lawnchair/issues/189
indexedDBValid = (callback) =>
   idb = window.indexedDB or window.webkitIndexedDB or window.mozIndexedDB or window.oIndexedDB or window.msIndexedDB
   # open a db to see if it's accessible. firefox won't let you open a db under certain scenarios
   # like if your privacy history setting is "never remember history"
   request = idb.open('test', 3)
   request.onsucess = => callback(true)
   request.onerror = => callback(false)

indexedDBValid (valid) =>
   if not valid
      # build a list of adapters with indexed-db removed
      adapters = _.filter Lawnchair.adapters, ((adpt) => adpt.adapter != 'indexed-db')
      adapters = _.map adapters, ((adpt) => return adpt.adapter)
      # re-init with our specific list of adapters
      lawnchair = new Lawnchair({adapter: adapters}, (->))
      
      
      
      
# MODIFICATIONS TO INDEXDB.JS
# Replace "request.onerror" methond on line 121 with

request.onerror = function(ev) {
    if (request.errorCode === getIDBDatabaseException().VERSION_ERR) {
        // xxx blow it away
        self.idb.deleteDatabase(self.name);
        // try it again (but only once more so we dont infinite loop)
        if (!options.recursing) {
          options.recursing = true
          return self.init(options, callback);
        }
    }
    console.error('Failed to open database');
};