'Generic Sensor API in Web Worker
I'm working on a Progressive Web App with Ionic 4. I'm able to use Generic Sensor API in the main thread, but I want to use it in a Web Worker, to read device motions (accelerometer, gyroscope, ...) with an event listener in background, when the app is not active (but opened in background).
Is there a way to do that ? Or is it an actual limitation of PWAs ?
Solution 1:[1]
No, it's not possible to access a Sensor API from Web Workers.
This is because Web Workers can not interact with the user and some API might ask for the user's permissions.
Workers are limited to a small subset of APIs which can be found at MDN: Functions and classes available to workers
Some of them include the
- messaging APIs
- limited Navigator API
- fetch API, XMLHttpRequest and WebSockets
- Data storage
- ...
See also: Web Worker API
However, what you can do is, listening to for sensor data in the main thread and sending it via the messaging APIs to the Web Worker.
Solution 2:[2]
You need to delete the migration files and again run the python manage.py makemigrations command. When it Prompts for a one-off default, you can use timezone.now, in order to populate the pre-existing rows in the database.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | try-catch-finally |
| Solution 2 | Swapnil Chopra |