Half-open state does not keep rejecting, and doesn't trigger re-try

[jerryjvl]

Proposed fix for issues reported in #119

This fix addresses the fact that once the circuit goes "half-open" it lets all further requests through, not just the first one. And the follow-on issue that failure of the first request let through does not guarantee the circuit gets treated as "open" again.

[coveralls]

Coverage remained the same at 99.396% when pulling d05b8d0 on jerryjvl:master into 9edc171 on bucharest-gold:master.

[lance]

@jerryjvl thanks for the contribution. That's definitely a race condition I did not consider. Would you be willing to write a test for this as well?

[lance]

Connects to: #119

[lance]

Landed in: 04df6f7

@jerryjvl thanks again for contributing this fix! I have added a test in 602a43c. I do not have a regular release cycle for this, so if you are need of a patch level release, let me know and I can push one out.

[jerryjvl]

Thanks! I didn't get any messages before I checked in here, will have to check up my email settings!
Would have happily contributed a test case as well if I'd seen it earlier.

No rush, we're working off my fork for now, once this one has an official release we'll pick that up.

[lance]

@jerryjvl s'all good - I pushed a 1.3.1 release with this fix last week: https://github.com/bucharest-gold/opossum/releases/tag/v1.3.1