Respect context cancellation and deadlines.

[favonia]

Description

The backoff during retries should have checked the deadline/timeout set by context.

Has your change been tested?

Two regression tests were added, though they are not very robust. The 2s and .5s 1s thresholds to detect whether the library is honoring the deadlines are in a sense arbitrary.

Types of changes

What sort of change does your code introduce/modify?

• 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 code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[favonia]

The linting error reported by golangci-lint was about this expression:

0x1 << uint8(math.Ceil(float64(i/2)))

I did not write it and it's orthogonal to this PR. Therefore, I would like to hear from the maintainers what to do before fixing it.

[jacobbednarz]

The linting error reported by golangci-lint was about this expression:

0x1 << uint8(math.Ceil(float64(i/2)))

golangci-lint would have picked this up as the line itself was edited in this PR. as the fix is just removing the math.Ceil function, i think we can get rid of that safely in this PR.

[favonia]

The linting error reported by golangci-lint was about this expression:
0x1 << uint8(math.Ceil(float64(i/2)))

golangci-lint would have picked this up as the line itself was edited in this PR. as the fix is just removing the math.Ceil function, i think we can get rid of that safely in this PR.

Got it. I tried to simplify the expression further.

[jacobbednarz]

LGTM, thanks! 🥳