perkeep/server/camlistored/ui/hash_worker.js

/*
Copyright 2014 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// These two lines are required setup to make goog.require() work throughout the codebase.
var CLOSURE_BASE_PATH = 'closure/goog/';
importScripts('closure/goog/bootstrap/webworkers.js', 'closure/goog/base.js', 'deps.js');

goog.require('cam.blob');
goog.require('cam.WorkerMessageRouter');

// This is a simple webworker that expects to receive a single message containing a file, and sends back that file's sha1 hash.
// We do this in a worker because we observed that doing it on the main thread decreased the framerate significantly, even when chunking, and even when the chunk sizes were as small as 32k.

var router = new cam.WorkerMessageRouter(goog.global);
router.registerHandler('ref', function(msg, sendReply) {
	sendReply(cam.blob.refFromDOMBlob(msg));
});