[GitHub] [incubator-superset] mistercrunch opened a new pull request #7716: [WiP] feat: backend for thumnail computation + caching + endpoints

[GitBox <gi...@apache.org>]

mistercrunch opened a new pull request #7716: [WiP] feat: backend for thumnail computation + caching + endpoints
URL: https://github.com/apache/incubator-superset/pull/7716
 
 
   This PR is the backend subset of WiP PR #6601. It includes:
   
   * refactor of the Selenium abstractions used for email schedules,
     generalized to also work with thumbs
   * new dependency on PIL, the common way of doing image processing in
     python, we use it to resize selenium screenshots into thumbs
   * CLI utilities to compute-thumbnails
   * the addition of an extra caching backend for thumbnail, in most cases
     we assume it should point to the same backend as the one used for
     chart JSON caching
   * 2 new endpoints to retrieve dashboard and chart thumbs
   
   ### CATEGORY
   
   Choose one### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TEST PLAN
   <!--- What steps should be taken to verify the changes -->
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   
   ### REVIEWERS
   

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