cache: redis backend

[cpakulski]

Commit Message:

Additional Description:
See https://github.com/cpakulski/envoy/blob/issue/27154/source/extensions/http/cache/redis_http_cache/DESIGN.md for more info.
Risk Level: Low
Testing: TBD
Docs Changes: TBD
Release Notes: TBD
Platform Specific Features:
Fixes #27154

[repokitteh-read-only]

As a reminder, PRs marked as draft will not be automatically assigned reviewers,
or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

🐱

Caused by: #38550 was opened by cpakulski.

see: more, trace.

[repokitteh-read-only]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @mattklein123
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #38550 was opened by cpakulski.

see: more, trace.

[cpakulski]

@ravenblackx and @jmarantz - I am wondering if you could do quick initial code review to check is there is anything obviously wrong in this PR (you commented on linked issue #27154). The code works but lacks coverage and tests. I wanted to get your opinion before committing to writing (not so trivial) tests. Thank you!

[ravenblackx]

I have a giant PR in flight that's going to change the API for this (which should actually make it much simpler for you, but unfortunately too late as you've already done the work, so now it's more work to refit it...)

#37990 in case you want to follow along.

[cpakulski]

I have a giant PR in flight that's going to change the API for this (which should actually make it much simpler for you, but unfortunately too late as you've already done the work, so now it's more work to refit it...)

#37990 in case you want to follow along.

Actually timing is not bad. I will check the #37990 and adjust my code to work with new API. The crux of my PR is management of connections to Redis and this is independent from cache filter.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[cpakulski]

WIP

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[cpakulski]

Waiting for refactored filter to be merged.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!