[ruby-list:50502] Re: [質問] net/http.rb 内 method の一部のraise抑止したい

内海@ベルギーです

ご自作のスクリプトがわからないのですが、ポートが
開いているかを確認してから呼べばよいのでは?


require 'socket'

   def is_open?(port)
     begin
       socket = TCPSocket.open("localhost", port)
       socket.close
       return true
     rescue Exception => e
       puts e.to_s
       return false
     end
   end

的外れだったらすみません。

On 2017/03/14 7:03, [e-mail] wrote:
> 山口と申します
>
> Windows 8.1 Enterprise
>> ver
> Microsoft Windows [Version 6.3.9600]
>> ruby –version
> Ruby 2.3.1p112 (2016-04-26 revision 54768) [x64-ming32]
>
> の環境で、
>
> 自作のスクリプトが、
> Failed to open TCP connection to 192.168.0.115:35803 (No connection
> could be made because the target machine actively refused it. - connect(
> 2) for "192.168.0.115" port 35803)
> と、net/http.rb 内 connect method 内 raise により、スクリプトが止まるの
> で、
>
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb:882: `No connection could be
> made because the target machine actively refused it. - connect(2) for "
> 192.168.0.115" port 35803' (Errno::ECONNREFUSED)
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:319:in `open_http'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:737:in `buffer_
> open'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:212:in `block in
> open_loop'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:210:in `catch'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:210:in `open_loop'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:151:in `open_uri'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:717:in `open'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:35:in `open'
>         from c:/yama/bin/UPnP/EasyUpnpWrap.rb:24:in `fetch_device_name'
>         from c:/yama/bin/UPnP/EasyUpnpWrap.rb:15:in `device_name'
>         from ./au_easy_upnp.rb:71:in `block in <main>'
>         from ./au_easy_upnp.rb:70:in `each'
>         from ./au_easy_upnp.rb:70:in `<main>'
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb:882:          raise e, "Failed
> to open TCP connection to " +
>
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb の 882行目辺りの raise している
> 箇所を、下記の様に直接編集
>
>     def connect
>     …
> =begin # original begin
>           raise e, "Failed to open TCP connection to " +
>             "#{conn_address}:#{conn_port} (#{e.message})"
> =end   # original end
>        # modified begin
>           puts "Failed to open TCP connection to " +
>                "#{conn_address}:#{conn_port} (#{e.message})"
>           return nil # 何も考えず nil で返しました。
>        # modified end
>      …
>
> 再度スクリプト実行すると、
>
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb:1476: `undefined method `closed?
> ' for nil:NilClass
> Did you mean?  clone' (NoMethodError)
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:737:in `buffer_
> open'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:212:in `block in
> open_loop'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:210:in `catch'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:210:in `open_loop'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:151:in `open_uri'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:717:in `open'
>         from C:/Ruby23-x64/lib/ruby/2.3.0/open-uri.rb:35:in `open'
>         from c:/yama/bin/UPnP/EasyUpnpWrap.rb:24:in `fetch_device_name'
>         from c:/yama/bin/UPnP/EasyUpnpWrap.rb:15:in `device_name'
>         from ./au_easy_upnp.rb:71:in `block in <main>'
>         from ./au_easy_upnp.rb:70:in `each'
>         from ./au_easy_upnp.rb:70:in `<main>'
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb:1476:      raise exception
>
> と、またraise によりスクリプトが停止するので、下記の様に
>
> def transport_request(req)
> …
>    rescue => exception
>       D "Conn close because of error #{exception}"
>       @socket.close if @socket and not @socket.closed?
> =begin # original
>      raise exception
> =end
>     end
>
> 直接編集で、とりあえず回避できるようになったので、上の暫定変更を元に戻し、
>
> httpWrap.rb を下記の様に作成
> C:/Ruby23-x64/lib/ruby/2.3.0/net/http.rb で定義されている module Net を
> 再オープン
> エラー部分を含むmethodをそのままコピー
> エラー部分を変更
> スクリプトより、require_relative ‘httpWrap’
> にて、スクリプトが raise で停止してしまうのを回避しました。
>
> もっとスマートな対応方法等ありますでしょうか？
>
> # cat httpWrap.rb
> module Net
>     …
>     def connect
>       …
>       s = Timeout.timeout(@open_timeout, Net::OpenTimeout) {
>         begin
>           TCPSocket.open(conn_address, conn_port, @local_host, @local_
> port)
>         rescue => e
> =begin # original
>           raise e, "Failed to open TCP connection to " +
>             "#{conn_address}:#{conn_port} (#{e.message})"
> =end
> # modified start
>           puts "Failed to open TCP connection to " +
>                "#{conn_address}:#{conn_port} (#{e.message})"
>           return nil
> # modified end
>         end
>       }
>     …
>     private :connect
>
>     def transport_request(req)
>     …
>     rescue => exception
>       D "Conn close because of error #{exception}"
>       @socket.close if @socket and not @socket.closed?
> #     raise exception # original code
>     end
>     …
> end
>