fix: short-term fix for issue #322

[sigua-cs]

Description

Max value for Host.Counter. Short-term fix for issue #322

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

• Linter passes correctly
• Add tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary

Does this introduce a breaking change?

• Yes
• No

Further comments

[render]

Your Render PR Server URL is https://chproxy-pr-333.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-ch6dk31jvhthotds3bb0.

[sigua-cs]

Does it make sense to remove s.host.dec()

chproxy/proxy.go

Line 235 in 5872a42

s.host.dec()

since the decrement will be called by defer s.dec()

chproxy/proxy.go

Line 107 in 5872a42

defer s.dec()

for the host that returns BadGateway?

[mga-chka]

be-careful, with such a big value you'll likely overflow.

You should put 1 << 31

[sigua-cs]

I'll test 1<<31
However, when it's 1<<32 s.host.inc() will be called

chproxy/proxy.go

Line 100 in 5872a42

if err := s.incQueued(); err != nil {

as result value will be 0

[mga-chka]

yes, and if 2 queries happens at the same time the value will be 2^32 + 1 (i.e overflow)

[sigua-cs]

After internal discussion closing this PR. I'll reopen another one with short-term fix