dash-flash 0.1.0a1

Flash - async port of the Dash framework

Flash

Flash is a Quart async Patch of Dash.

Flash is a async patch of the Plotly Dash library, building on Quart as backend instead of Flask. It is very inspired by the already existing dash-async repo, but covering all features up to Dash 2.18.2

Quarts async capabilities are directly baked into the standard library, making it easy to inject into existing projects.

Flash makes it possible to run true async callbacks and layout functions while running sync functions in a separate thread (asyncio.run_in_executor).

With dash-extensions you can create native websocket components and handle server side events making your application realtime compatible.

Table Of Contents

• Motivation
• Caveats
• Known Issues
• TODO

Motivation

One of my biggest pain points in Dash was to handle database requests, forcing me to add quite alot callbacks to first fetch a lacy component and then render the real component when the ID of the lacy copmonent appeared. Often leading to quite complex pattern matching callbacks to fetch each components data.

Now the DB requests dont block each other and alot interaction can be outsourced to the URL. In order to enhace further responsiveness i am thinking about to add a LazyLoad compoent (more-infos)

Caveats

• background callbacks have run to sync
  • will be fixed in the future
  • sync callback gets put into a spearate exeuctor
• dash testings - dash_duo had to be changed to a multi process runner instead of a threaded runner
• somehow I can't turn of logs in dev mode

Known Issues

• not all tests pass - detailed look in TEST_LOGS.md
  • 10 integration tests
  • 2 unit tests

TODO

• shared callbacks / channel callbacks like dash-devices offered. Will most likly be implemented with redis PubSub

• adding a LacyLoad component like dash-grocery, this will also increase responsiveness and overall better UI feeling