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Author SHA1 Message Date
Scott Nonnenberg
b159a8d7c7 Update the user agent for debug log requests 2018-07-18 20:00:10 -07:00
Scott Nonnenberg
675e34fc8d New React component: ConversationListItem, installed in left pane 
When collecting a conversation's last message, we grab that message's
status as well (if outgoing) and show it.
 2018-07-17 20:25:55 -07:00
Scott Nonnenberg
3c69886320 Finish new Message component, integrate into application 
Also:
- New schema version 8 with video/image thumbnails, screenshots, sizes
- Upgrade messages not at current schema version when loading messages
  to show in conversation
- New MessageDetail react component
- New ConversationHeader react component
 2018-07-17 15:58:07 -07:00
Scott Nonnenberg
dc11db92f9 New React component: Message 
Also: Use react to render contects on the 'show group members' screen
 2018-07-17 15:53:33 -07:00
Scott Nonnenberg
ad4387803b New media permission, show dialog when not enabled for voice msg 
UI now in separate renderer:
  - the permissions popup
  - settings dialog
  - debug log dialog
  - about window

Couple bug fixes:
  - About Window: Fix 'escape' to close window
  - Remove outdated dist/copy tasks from Gruntfile

Eslintified settings_view.js
 2018-07-03 16:04:21 -07:00
Scott Nonnenberg
125c3fafa8
Idle detector: Fix bug preventing it from ever turning off (#2487) 2018-07-03 15:02:58 -07:00
Scott Nonnenberg
8eeaad8e18 Remove unused export/import functionality 2018-06-21 11:54:01 -07:00
Scott Nonnenberg
f3bd0cf903 Refactor api.js into web_api, which encapsulates all web access 2018-05-31 13:25:45 -07:00
Scott Nonnenberg
34f423b52c Remove unused code; move signal.js to js/modules for eslint 
(noticed as I was doing this that signal.js doesn't get eslint coverage)
 2018-05-23 16:26:48 -07:00
Scott Nonnenberg
e2d044e02b Filter file scheme; disable http, https and ftp entirely 2018-05-23 16:26:40 -07:00
Scott Nonnenberg
80b069e9b6 Move phone number format/parse into ts/types/PhoneNumber 2018-05-10 11:54:58 -07:00
Scott Nonnenberg
aa13a2c6f7 Parse phone numbers into e164 as part of schema upgrade 2018-05-10 11:54:58 -07:00
Scott Nonnenberg
d2293d9592 parseAndWriteAvatar: Do shallow copy before omit() call 
Otherwise, we get all prototype props/functions, which we can't save in IndexedDB
 2018-05-10 11:54:58 -07:00
Daniel Gasienica
3bf8a8966a Notification improvements 
- Remove on read, on focus, and on exit.
- Show multi-message notifications like '5 new messages'.
 2018-05-10 14:45:56 -04:00
Daniel Gasienica
16bc1d34c6 Message schema 6: Change classification of media and documents 
For an easier implementation, we change our original definition of
`initializeAttachmentMetadata`. This means we have to re-run it marked as
version 6 and mark schema version 5 as deprecated as its definition has changed.
 2018-05-08 16:41:07 -04:00
Daniel Gasienica
101041f106 Derive Message.CURRENT_SCHEMA_VERSION 2018-05-08 16:41:06 -04:00
Scott Nonnenberg
26be658892 Remove 'Contact' from 'Contact.*' properties, clean->parse 2018-05-08 13:12:11 -07:00
Scott Nonnenberg
cda326ca45 Use protobuf enum values to eliminate magic numbers 2018-05-08 11:14:56 -07:00
Scott Nonnenberg
adbe989949 validateContact: Return error instead of logging 2018-05-08 10:31:16 -07:00
Scott Nonnenberg
d0efccd121 A couple renames in contact.js 2018-05-08 09:59:25 -07:00
Scott Nonnenberg
420f81ebcd Move contact migrate code from message.js to contact.js 2018-05-08 09:48:47 -07:00
Scott Nonnenberg
37821e5a1b Wire up all contact behaviors, refactor Contact type/selector 2018-05-07 19:11:35 -07:00
Scott Nonnenberg
3ea3e4e256 Contact sharing: protos and data pipeline 
As of this commit: 82b76ccf37
 2018-05-07 19:09:55 -07:00
Daniel Gasienica
a86056630f Use Attachment.isVoiceMessage 2018-05-07 21:53:39 -04:00
Daniel Gasienica
5c8f734e67 Remove newlines from group IDs 2018-05-03 13:24:39 -04:00
Daniel Gasienica
a102016ed8 Port Settings and OS to TypeScript 2018-05-02 20:01:57 -04:00
Scott Nonnenberg
754d65ae2e Let's make it all pretty, shall we? 
We missed a couple directories with previous attempts to turn this on
globally: app/ and libtextsecure/

Not to mention files in places we didn't expect: ts files that weren't
in the ts directory!

This turns prettier on for every file we care about (js, ts, tsx, md)
everywhere in the project but for a few key parts.
 2018-05-02 13:40:57 -07:00
Daniel Gasienica
6eca5ee940 Document that JPEG auto-orient strips EXIF metadata 2018-04-30 19:05:10 -04:00
Daniel Gasienica
1dd87ad197 Format all source code using Prettier 2018-04-30 16:53:34 -04:00
Daniel Gasienica
e4baf27fa7 Increase migration conversion speed by a factor of 3x 2018-04-30 16:51:14 -04:00
Daniel Gasienica
d00fb560b0 Avoid exposing AttachmentTS 2018-04-27 16:31:43 -04:00
Daniel Gasienica
f36f206a01 Use IndexablePresence for hasFileAttachments and hasVisualMediaAttachments 
Reduces index size, makes it easier to debug using IndexedDB inspector, and
hopefully improves lookup performance.
 2018-04-25 15:25:12 -04:00
Daniel Gasienica
8e3c38d5fe Fix formatting 2018-04-25 15:25:12 -04:00
Daniel Gasienica
146178f977 Update schema documentation 2018-04-25 15:24:51 -04:00
Daniel Gasienica
082ef98a56 Add type definition for deferredToPromise 2018-04-25 15:24:51 -04:00
Daniel Gasienica
9d84b2f420 Index messages with attachments using a boolean 
When indexing message attachment metadata using numeric indexes such as:

```javascript
{
  conversationId: '+12223334455',
  received_at: 123,
  attachments: […],
  numAttachments: 2,
},
{
  conversationId: '+12223334455',
  received_at: 456,
  attachments: [],
  numAttachments: 0,
}
{
  conversationId: '+12223334455',
  received_at: 789,
  attachments: [],
  numAttachments: 1,
}
```

It creates an index as follows:

```
[conversationId, received_at, numAttachments]
['+12223334455', 123, 2]
['+12223334455', 456, 0]
['+12223334455', 789, 1]
```

This means a query such as…

```
lowerBound: ['+12223334455', 0,                1               ]
upperBound: ['+12223334455', Number.MAX_VALUE, Number.MAX_VALUE]
```

…will return all three original entries because they span the `received_at`
from `0` through `Number.MAX_VALUE`. One workaround is to index booleans using
`1 | undefined` where `1` is included in the index and `undefined` is not, but
that way we lose the ability to query for the `false` value. Instead, we flip
adjust the index to `[conversationId, hasAttachments, received_at]` and can
then query messages with attachments using

```
[conversationId, 1 /* hasAttachments */, 0                /* received_at */]
[conversationId, 1 /* hasAttachments */, Number.MAX_VALUE /* received_at */]
```
 2018-04-25 15:24:51 -04:00
Daniel Gasienica
5f220a7b2c Add migration for media gallery indices 2018-04-25 15:24:50 -04:00
Daniel Gasienica
d14761087a Add schema version 4: Attachment metadata 2018-04-25 15:24:50 -04:00
Daniel Gasienica
df2e6e7864 Port MIME module to TypeScript 2018-04-25 15:24:50 -04:00
Daniel Gasienica
6a63e427c8 Use is instead of Lodash is* 2018-04-25 15:24:50 -04:00
Scott Nonnenberg
bf81c3db63
Document Message v4, remove data-free thumbnails 2018-04-23 16:43:25 -07:00
Scott Nonnenberg
c02860af5c
Responding to pull request review feedback 
- messages.getQuoteObjectUrl: early return
- backup.js: explaining variables for long if statement
- types/messages.js: Log if thumbnail has neither data nor path
- sendmessage.js:
  - remove extraneous logging
  - fix indentation
  - upload attachments and thumbnails in parallel
- preload: don't load fs for tests, just fse
- _conversation.scss: split two selectors into two lines, 0px -> 0
- backup_test.js: use fse.existsSync and comment twoSlashes regex
- network_tests_view_test.js: Comment duplicate assignment to window.getSocketStatus
 2018-04-23 15:36:47 -07:00
Scott Nonnenberg
a7d44d3344
Backup and end-to-end test! 2018-04-20 15:24:04 -07:00
Scott Nonnenberg
978ff0e2bb
Refactor: Use correct name for sanitized filename in backup.js 2018-04-20 15:24:02 -07:00
Scott Nonnenberg
f1ff040842
Finish type definition for _mapQuotedAttachments 2018-04-16 12:16:34 -07:00
Scott Nonnenberg
9ad55c803f
Fix handling attachment thumbnails using thumbnail key 2018-04-13 18:10:51 -07:00
Scott Nonnenberg
054d3887a1
Quotes: The full pipeline into the database 
1. MessageReceiver always pulls down thumbnails included in quotes
2. Message.upgradeSchema has a new schema that puts all thumbnails on
   disk just like happens with full attachments.
3. handleDataMessage pipes quote from dataMessage into the final message
   destined for the database
 2018-04-13 18:05:45 -07:00
Scott Nonnenberg
21bf02c94d
Fixed examples in Quote.md, rough Android visuals 2018-04-13 18:05:44 -07:00
Daniel Gasienica
d7b845326d ESLint auto-fix link_text 2018-04-11 16:36:42 -04:00
Daniel Gasienica
9d41b86162 Remove escaping from linkText 
We leverage jQuery’s HTML escaping in `$.html(…)`.
 2018-04-11 16:36:42 -04:00
Daniel Gasienica
f04c65088b Fork link-text module 2018-04-11 16:36:42 -04:00
Daniel Gasienica
24f4ad53bc Use single quotes for identifiers 2018-04-11 15:54:32 -04:00
Daniel Gasienica
432a6ebd7f Redact file paths with escaped slashes 2018-04-11 15:30:59 -04:00
Daniel Gasienica
a8a7525609 Redact stack traces with forward and backslashes 2018-04-11 15:30:59 -04:00
Daniel Gasienica
b0da7d965e Redact URL encoded file paths in stack traces 2018-04-11 15:30:59 -04:00
Daniel Gasienica
f2c9ccae90 Prefer is.* over Lodash is* functions 2018-04-11 15:30:59 -04:00
Daniel Gasienica
2ee78ec556 Prefer path over Path 2018-04-11 15:30:59 -04:00
Scott Nonnenberg
c6c3b65bbc
Introduce React, TypeScript, TSLint and React-StyleGuidist (#2219) 
Quite a bit of change here.

First, the basics:

- New dependencies were added: react, typescript, tslint, and react-styleguidist
- A new npm script: transpile. It uses typescript to process .tsx files in js/react, putting .js files next to the original file. It's part of the watch functionality of grunt dev as well as the default task run with just grunt (used to build the app prior to release). A lighter-weight to get watch behavior when just working on React components is to run yarn transpile --watch.
- yarn run clean-transpile will remove generated .js files


Style guide via react-styleguidist. Example site: https://react-styleguidist.js.org/examples/basic/

- Start with yarn styleguide
- Component.md files right next to the .tsx file
- jsdoc-style comments are picked up and added to the generated part of the styleguide - the overall summary and a table listing methods and properties of the component
- It has hot-reloading!
- It uses webpack, which means that our app now pulls in webpack though we don't use it to generate anything for the production app.
- I did a bunch of work to enable the use of Backbone views in this context, which will allow us to move smoothly from the old world to the new. First, add all the permutations in the old way, and then slowly start to re-render those same views with React.

A bit of dependency cleanup to enable use in React components:

- moment was moved from our Bower dependencies to our npm dependencies, so it can be used in React components not running in a browser window.
- i18n was moved into the new commonjs format, so it can be used in React components even if window is not available.

Lastly, a bit of Gruntfile cleanup:

- Removal of Chrome App-era modifications of background.js
- Make jshint/jscs watch more targeted, since more and more we'll be using other tools
 2018-04-06 08:13:00 -07:00
Scott Nonnenberg
50d4dbaae7
Remove 'use strict' from i18n.js 2018-04-05 13:42:41 -07:00
Scott Nonnenberg
76be13552f
js/i18n.js -> js/modules/i18n.js 2018-04-05 12:51:29 -07:00
Daniel Gasienica
195e9b777c Rename willHaveAttachmentsSavedOnFileSystemDuringUpgrade 
New name: `willAttachmentsGoToFileSystemOnUpgrade`
 2018-04-04 19:11:46 -04:00
Daniel Gasienica
4c4443390a Rename createImporter to createAttachmentDataWriter 2018-04-04 19:11:46 -04:00
Daniel Gasienica
5ea1a305a6 Clarify error origin 2018-04-04 18:41:50 -04:00
Daniel Gasienica
9dcb64b53c Initialize schema version upon import 2018-04-04 18:41:50 -04:00
Daniel Gasienica
cfad983d08 Consistently use ciphertext instead of encrypted 2018-04-04 18:41:50 -04:00
Daniel Gasienica
a61c905146 Impliclity decrypt data if key is present 2018-04-04 18:41:50 -04:00
Daniel Gasienica
94c75762b5 Add Message.createAttachmentLoader 2018-04-04 18:41:50 -04:00
Daniel Gasienica
43ab320d31 Load attachments before writing them upon export 2018-04-04 18:41:50 -04:00
Daniel Gasienica
7eeabb5b1a Add precondition for writeAttachment 2018-04-04 18:41:50 -04:00
Daniel Gasienica
0faaf52b71 Import and upgrade messages upon save 2018-04-04 18:41:50 -04:00
Daniel Gasienica
cf7355bd2f Rename backupToDirectory to exportToDirectory 
For symmetry reasons.
 2018-04-04 18:41:50 -04:00
Daniel Gasienica
bf67254cc5 Add Message.createImporter 2018-04-04 18:41:50 -04:00
Daniel Gasienica
efd673083d Rename writeAttachmentData to writeNewAttachmentData 2018-04-04 18:41:50 -04:00
Daniel Gasienica
ce8fe0d345 Add Signal.Startup module 2018-04-04 18:10:52 -04:00
Daniel Gasienica
8474f3cf7f Use create* prefix to clarify curried functions 2018-04-03 15:25:24 -04:00
Daniel Gasienica
12cdeee7ec Rename count to numMessagesPerBatch 2018-04-03 14:43:17 -04:00
Daniel Gasienica
38ac9972e8 Improve termination condition 2018-04-03 13:16:05 -04:00
Daniel Gasienica
5b1a0c45df Replace getAll with cursor 
This reduces the likelihood of IPC message size error.
 2018-04-03 13:16:05 -04:00
Daniel Gasienica
ed77378293 Fix bug in termination condition 2018-04-03 12:30:13 -04:00
Daniel Gasienica
052fb841f6 Allow database name override in migrations 2018-04-03 11:45:10 -04:00
Daniel Gasienica
1e04083813 Support database upgrades in Database.open 2018-04-03 11:44:50 -04:00
Daniel Gasienica
f50ac1c99e Reduce excessive logging about database status 2018-04-03 11:06:56 -04:00
Daniel Gasienica
77b1f3c505 Replace startup with attachment background migration 
Iterates through `Message::id` index.
 2018-04-02 20:07:07 -04:00
Daniel Gasienica
057762806e Add support for attachment background migration without index 2018-04-02 19:41:28 -04:00
Daniel Gasienica
2e4893f4c1 Clarify implications of introducing new migrations 2018-04-02 18:54:51 -04:00
Daniel Gasienica
7413b787b6 Make migrations private 2018-04-02 18:54:28 -04:00
Daniel Gasienica
b07c66eaa7 Generate attachments from local files 
This ensures our benchmarking is closer to real-world usage, e.g. images, video,
etc. that are not compressible.
 2018-04-02 17:58:37 -04:00
Daniel Gasienica
064a40544c Fix error message formatting 2018-04-02 17:42:04 -04:00
Daniel Gasienica
442f5d7295 Use done to match JavaScript iterators 
See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators
 2018-04-02 17:42:04 -04:00
Daniel Gasienica
a4f0c5242f Document why batch size is one 2018-04-02 17:42:04 -04:00
Daniel Gasienica
805031ade8 Conditionally run post-attachment migrations 
Introduce placeholder migrations for Backbone models so they never implicitly
run migrations whenever they are `fetch`ed. We prefer to run our migrations
explicitly upon app startup and then let Backbone models be (slightly) dumb(er)
models, without inadvertently triggering migrations.
 2018-04-02 17:42:04 -04:00
Daniel Gasienica
bfbeedab5c Temporarily disable post-attachment migration migrations 2018-04-02 15:26:24 -04:00
Daniel Gasienica
d9be6a0f94 Destructure Lodash requires 2018-04-02 15:12:04 -04:00
Daniel Gasienica
b7b6195cfc Extract IIFE into separate function 2018-04-02 12:17:36 -04:00
Daniel Gasienica
11f98474ba Capture how many messages we have to process 2018-04-02 12:17:36 -04:00
Daniel Gasienica
0fdc1140dd Add Database.getCount function 2018-04-02 12:17:36 -04:00
Daniel Gasienica
1f8556b049 Remove unused createCollection 2018-04-02 12:17:36 -04:00
Daniel Gasienica
c67c2a858a Remove Backbone references for attachment migration 
It has to run without any other migrations interfering.
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
0c40f35623 Document disadvantage of fetching messages without index 2018-04-02 12:17:36 -04:00
Daniel Gasienica
d3c9de4712 Add debug module 
Lets us generate large conversations with large attachments.
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
30037e5308 Reduce attachment migration batch size to 1 
This prevents ‘Maximum IPC message size exceeded’ due to IDB `getAll` operation.

- https://github.com/zincbase/zincdb/issues/17
- https://cs.chromium.org/chromium/src/content/browser/indexed_db/indexed_db_database.cc?q=%22Maximum+IPC+message+size+exceeded%22&sq=package:chromium&l=1160
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
21147a20a0 Add sleep module 2018-04-02 12:17:36 -04:00
Daniel Gasienica
08f73b8420 Remove last processed index after attachment migration 2018-04-02 12:17:36 -04:00
Daniel Gasienica
696a144ab7 Add settings.deleteItem 2018-04-02 12:17:36 -04:00
Daniel Gasienica
5910f84af4 Remove outdated documentation 2018-04-02 12:17:36 -04:00
Daniel Gasienica
efe3cd67fc Allow attachment migration run on higher database version 2018-04-02 12:17:36 -04:00
Daniel Gasienica
921c3dba7c Skip migrations that have already been applied 2018-04-02 12:17:36 -04:00
Daniel Gasienica
417511ffd2 Add database.getVersion 2018-04-02 12:17:36 -04:00
Daniel Gasienica
c5c94bc3ab Extract getMigrationVersions 2018-04-02 12:17:36 -04:00
Daniel Gasienica
6aea36240d Rename closeDatabase to closeDatabaseConnection 2018-04-02 12:17:36 -04:00
Daniel Gasienica
016432826b Extract database and settings modules 2018-04-02 12:17:36 -04:00
Daniel Gasienica
5bea894abd Close database connection via Backbone IDB adapter 2018-04-02 12:17:36 -04:00
Daniel Gasienica
f50e9ae364 Log closing connection of database 2018-04-02 12:17:36 -04:00
Daniel Gasienica
4ff8bc3357 Use camelCase for non-constructors 2018-04-02 12:17:36 -04:00
Daniel Gasienica
3720c3f3bb Improve log message 2018-04-02 12:17:36 -04:00
Daniel Gasienica
ce5b450fdb Log targetSchemaVersion 2018-04-02 12:17:36 -04:00
Daniel Gasienica
f7f24b5822 Log total number of processed messages 2018-04-02 12:17:36 -04:00
Daniel Gasienica
eca930770c Remove hard-coded database connection settings 2018-04-02 12:17:36 -04:00
Daniel Gasienica
1df6dc8378 Abort processing if there are no more messages 2018-04-02 12:17:36 -04:00
Daniel Gasienica
d5d0eabdfd Remove usage of storage module 2018-04-02 12:17:36 -04:00
Daniel Gasienica
8966e80284 Improve identifier names 2018-04-02 12:17:36 -04:00
Daniel Gasienica
3e2d575506 Document MessageDataMigrator module design 2018-04-02 12:17:36 -04:00
Daniel Gasienica
3c57dbfb56 Extract NUM_MESSAGES_PER_BATCH 2018-04-02 12:17:36 -04:00
Daniel Gasienica
85788d3c4a Match items storage format to Backbone adapter 2018-04-02 12:17:36 -04:00
Daniel Gasienica
7de7fcf561 Avoid no-param-reassign violation 2018-04-02 12:17:36 -04:00
Daniel Gasienica
070235b59b Implement MessageDataMigrator.processAll 
Upgrades schema of all messags upon startup.
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
178a3cc262 Reduce work for verifying transaction completion 2018-04-02 12:17:36 -04:00
Daniel Gasienica
b6e978f74c Implement MessagesDataMigrator.processAll 2018-04-02 12:17:36 -04:00
Daniel Gasienica
457bf7ab9d Add createCollection function 2018-04-02 12:17:36 -04:00
Daniel Gasienica
8ea257ad4d Use double quotes for identifiers in error messages 2018-04-02 12:17:36 -04:00
Daniel Gasienica
172616ca4f Add log message for dummy migration 18 2018-04-02 12:17:36 -04:00
Daniel Gasienica
579b01283e Replace wrapDeferred with deferredToPromise 2018-04-02 12:17:36 -04:00
Daniel Gasienica
40c40c800a Prefer exports 2018-04-02 12:17:36 -04:00
Daniel Gasienica
da144edc56 Manually close database connection after migration 2018-04-02 12:17:36 -04:00
Daniel Gasienica
106ce21c49 Remove redundant log message 2018-04-02 12:17:36 -04:00
Daniel Gasienica
fcd30cd919 Close database after migration 
This is not 100% reliable as database connections are closed in a separate
thread according to the documentation:
- https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabase/close
- https://stackoverflow.com/a/18639298
- 80c7a06d5c/backbone-indexeddb.js (L558-L565)
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
c765422fa1 Extract deferredToPromise 2018-04-02 12:17:36 -04:00
Daniel Gasienica
e2f1339ab9 Explicitly run post-attachment migrations 2018-04-02 12:17:36 -04:00
Daniel Gasienica
d7c8d33edb Extract runMigrations 2018-04-02 12:17:36 -04:00
Daniel Gasienica
d16178638e Split database migrations into pre- and post-attachment migration 
- Run light-weight migrations before attachment migration.
- Run regular migrations after attachments have been moved to disk.
 2018-04-02 12:17:36 -04:00
Daniel Gasienica
90de9d85a3 Remove type annotation 2018-03-26 16:56:37 -04:00
Daniel Gasienica
4c10fcfa17 Reduce threshold until optimization appears to 1s 2018-03-26 16:56:37 -04:00
Daniel Gasienica
add19aa732 Add initialization view 2018-03-26 16:56:37 -04:00
Daniel Gasienica
9b112489cd Upgrade 2 messages every 30 seconds 
This results in 4 messages per minute or 240 messages per hour.
 2018-03-26 16:49:21 -04:00
Daniel Gasienica
7c2fde4433 Add Signal.Workflow namespace 2018-03-26 16:49:21 -04:00
Daniel Gasienica
4a7cc22de3 🎨 Use window.requestIdleCallback 2018-03-26 16:49:21 -04:00
Daniel Gasienica
4651cbc2eb Improve `Message.upgradeSchema preconditions 2018-03-26 16:49:21 -04:00
Daniel Gasienica
ca28f3030b Add MessageMigration module 2018-03-26 16:49:21 -04:00
Daniel Gasienica
8e762797c0 Remove attachment validation 
Turns out `fileName` is optional and maybe even `contentType`. We should revisit
this at a later point in time.
 2018-03-26 16:49:21 -04:00
Daniel Gasienica
09ee2d4ea2 Switch to using requestIdleCallback 
Example:
https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API#Example
 2018-03-26 16:49:21 -04:00