3 日坊主日記

_ [Ruby] Net::HTTP#open_timeout の使い方

#!/usr/bin/ruby
require 'net/http'
Net::HTTP.start('www.example.com') do |http|
  response = http.head('/heartbeat.txt')
  p response
end

(ruby) Net::HTTP で接続に失敗すると

:!ruby heartbeat.rb
/usr/lib/ruby/1.8/net/http.rb:560:in `initialize': Connection timed out - connect(2) (Errno::ETIMEDOUT)
        from /usr/lib/ruby/1.8/net/http.rb:560:in `open'
        from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
        from /usr/lib/ruby/1.8/timeout.rb:48:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:76:in `timeout'
        from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
        from /usr/lib/ruby/1.8/net/http.rb:553:in `do_start'
        from /usr/lib/ruby/1.8/net/http.rb:542:in `start'
        from /usr/lib/ruby/1.8/net/http.rb:440:in `start'
        from heartbeat.rb:3

shell returned 1

となる。

Connection timed out - connect(2) が出るまでかなり待たされるので timeout を設定するわけだが

#!/usr/bin/ruby
require 'net/http'
Net::HTTP.start('www.example.com') do |http|
  http.open_timeout = 10  # xxx: 間違い
  http.read_timeout = 20

  response = http.head('/heartbeat.txt')
  p response
end

これは間違い。start() でこけてるのにその後ろで指定してもだめ。なので

#!/usr/bin/ruby
require 'net/http'
http = Net::HTTP.new('www.example.com')
http.open_timeout = 10
http.read_timeout = 20
http.start do
  response = http.head('/heartbeat.txt')
  p response
end

:!ruby heartbeat.rb
/usr/lib/ruby/1.8/timeout.rb:54:in `open': execution expired (Timeout::Error)
        from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
        from /usr/lib/ruby/1.8/timeout.rb:56:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:76:in `timeout'
        from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
        from /usr/lib/ruby/1.8/net/http.rb:553:in `do_start'
        from /usr/lib/ruby/1.8/net/http.rb:542:in `start'
        from heartbeat.rb:6

shell returned 1

これで ok。