Add support for async filters

[mauve]

Adds async document, operation, parameter and request body filters.

Fixes: #1661

[mauve]

Hi @martincostello, Thanks for taking over maintainership of the project ❤️.

Is there a way for me to trigger the checks?

[martincostello]

Is there a way for me to trigger the checks?

No, it's a built-in feature of GitHub Actions for first time contributors to a repo - someone with write access needs to approve them to run until your first contribution is merged.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.48241% with 7 lines in your changes missing coverage. Please review.

Project coverage is 90.43%. Comparing base (12245c0) to head (fb66275).

Files	Patch %	Lines
...washbuckle.AspNetCore.Swagger/SwaggerMiddleware.cs	80.76%	5 Missing ⚠️
...re.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs	98.72%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2938      +/-   ##
==========================================
+ Coverage   90.13%   90.43%   +0.29%     
==========================================
  Files          72       72              
  Lines        2736     2832      +96     
  Branches      433      443      +10     
==========================================
+ Hits         2466     2561      +95     
- Misses        270      271       +1     

Flag	Coverage Δ
Linux	90.43% <96.48%> (+0.29%)	⬆️
Windows	90.21% <96.48%> (+0.08%)	⬆️
macOS	90.43% <96.48%> (+0.29%)	⬆️

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[mauve]

@martincostello The tests are now green :) Let me know if you want any further changes.

[martincostello]

Thanks - I'll take a look at this in more detail tomorrow 👍

[mauve]

@martincostello Hi, have you had chance to look at it?

[martincostello]

Sorry, not yet, but it's on my TODO list.

[martincostello]

Hi @mauve - I checked out your pull request locally and had a look around the code. I've done some refactoring in this commit that aims to reduce the duplication in SwaggerGenerator: martincostello@01cf4d5

What are your thoughts on the approach?

[mauve]

Great! Unsure what the process should be but I just cherry-picked your commit to the top of my PR.

[martincostello]

Thanks - I'll take a proper look at this again either later this afternoon, or more likely, tomorrow 👍

[mauve]

@martincostello I have removed the CancellationToken from GetSwaggerAsync, however I left them in the newly added interfaces so that we don't need to break that interface when we introduce CancellationToken again.