Fix X-RateLimit headers handling when using CompositeDelayFunction

[sklv-max]

1. Filtering out default durations in the CompositeDelayFunction.
2. Returning default duration from the CompositeDelayFunction instead of null.

Description

Since RateLimitResetDelayFunction and RetryAfterDelayFunction are returning Duration.ofMinutes(-1) instead of null as the default value since Riptide 4, it is needed to check not only for non-null values but also if there are any non-default delays in the CompositeDelayFunction.

Motivation and Context

1. In Riptide 4 the default value in RateLimitResetDelayFunction and RetryAfterDelayFunction was changed from null to Duration.ofMinutes(-1) link
2. Failsafe 2.x.x used both negative duration and null as default values (link)
3. Failsafe 3.x.x mentions only negative values as default values (link). If null is returned from delay function, it leads to NPE in the Failsafe.

As Riptide 4, if CompositeDelayFunction consists of two functions (A and B) and A returns default value and B returns a positive meaningful value, the default value would be taken since it is not null.

The issue is opened here.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[fatroom]

@sklv-max please verify your gpg key and sign commit: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

[sklv-max]

@sklv-max please verify your gpg key and sign commit: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

Thank you for pointing out, have done that.

[fatroom]

👍

[puncleV]

👍

[fatroom]

Thank you for the contribution!