Revert to IO.select for PerOperation timeouts (fixes #298)

[tarcieri]

I have tried the repro case from #298 from this and this appears to
fix the problem.

Not sure why: the intended semantics appear to be equivalent. Possibly
a MRI bug that was fixed in 2.3?

[tarcieri]

This kind of sucks as these are specifically the timeouts I feel this optimization would be beneficial for. Nevertheless, it seems prior to Ruby 2.3, we're hitting some kind of MRI bug?

/cc @zanker

[zanker]

Lol Ruby 😔

I fee like we just need something for Travis that has very detailed test semantics for each set of timeout code in each Ruby version.

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On Mar 20, 2016, at 18:05, Tony Arcieri notifications@github.com wrote:

This kind of sucks as these are specifically the timeouts I feel this optimization would be beneficial for. Nevertheless, it seems prior to Ruby 2.3, we're hitting some kind of MRI bug?

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[zanker]

(Looks good)

Sent from my iPhone

On Mar 20, 2016, at 18:05, Tony Arcieri notifications@github.com wrote:

This kind of sucks as these are specifically the timeouts I feel this optimization would be beneficial for. Nevertheless, it seems prior to Ruby 2.3, we're hitting some kind of MRI bug?

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[tarcieri]

Would be nice if the particular repro case could be turned into some sort of test. That said, timeout tests are the bane of my existence, especially on CI.

All that said... on master (Ruby 2.2.4 / OS X 10.11.3):

$ bundle exec ruby test.rb                                                                                      1 ↵
  1 ... fail (0.05978870391845703)
/Users/bascule/src/http/lib/http/timeout/per_operation.rb:70:in `block in readpartial': Read timed out after 5 seconds (HTTP::TimeoutError)
    from /Users/bascule/src/http/lib/http/timeout/per_operation.rb:61:in `loop'
    from /Users/bascule/src/http/lib/http/timeout/per_operation.rb:61:in `readpartial'
    from /Users/bascule/src/http/lib/http/connection.rb:210:in `read_more'
    from /Users/bascule/src/http/lib/http/connection.rb:84:in `readpartial'
    from /Users/bascule/src/http/lib/http/response/body.rb:48:in `to_s'
    from /Users/bascule/src/http/lib/http/response.rb:79:in `flush'
    from test.rb:11:in `block in <main>'
    from test.rb:6:in `times'
    from test.rb:6:in `<main>'

On this branch:

$ bundle exec ruby test.rb
  1 ... pass (0.4926888942718506)
  2 ... pass (0.07799601554870605)
  3 ... pass (0.06123685836791992)
  4 ... pass (0.07111287117004395)
  5 ... pass (0.0842127799987793)
  6 ... pass (0.07085514068603516)
  7 ... pass (0.0738520622253418)
  8 ... pass (0.07160758972167969)
  9 ... pass (0.06447196006774902)
 10 ... pass (0.0648660659790039)
 11 ... pass (0.07875204086303711)
 12 ... pass (0.10101890563964844)
 13 ... pass (0.06365585327148438)
 14 ... pass (0.06893110275268555)
 15 ... pass (0.06424498558044434)
 16 ... pass (0.0738980770111084)
 17 ... pass (0.0613102912902832)
 18 ... pass (0.059870004653930664)
 19 ... pass (0.06126594543457031)
 20 ... pass (0.06668996810913086)
 21 ... pass (0.06355500221252441)
 22 ... pass (0.06531405448913574)
 23 ... pass (0.06339097023010254)
 24 ... pass (0.06269621849060059)
 25 ... pass (0.06451606750488281)
 26 ... pass (0.06104087829589844)
 27 ... pass (0.0631570816040039)
 28 ... pass (0.0637977123260498)
 29 ... pass (0.06388187408447266)
 30 ... pass (0.07471394538879395)
 31 ... pass (0.0644233226776123)
 32 ... pass (0.1105501651763916)
 33 ... pass (0.06400489807128906)
 34 ... pass (0.06013226509094238)
 35 ... pass (0.06827473640441895)
 36 ... pass (0.07304501533508301)
 37 ... pass (0.07212209701538086)
 38 ... pass (0.0656731128692627)
 39 ... pass (0.07112288475036621)
 40 ... pass (0.08130216598510742)
 41 ... pass (0.06479501724243164)
 42 ... pass (0.07647204399108887)

[tarcieri]