ruby-dev

遠藤です。

open-uri を使って定期的に Web ページを取得するプログラムを走らせて
いると、実にさまざまな例外が投げられうることに気がつきました。

今のところ経験したことがあるのは以下の 7 つです (経験した順) 。

- Errno::ETIMEDOUT
- OpenURI::HTTPError
- Errno::ECONNRESET
- Timeout::Error
- EOFError
- Errno::EHOSTUNREACH
- SocketError


そこで質問です。

1) open-uri が投げうる例外は他にあるでしょうか (Errno::* はいくらでも
ありそうですが) 。

2) この中で本来投げられるべきでない例外はないでしょうか。EOFError は
少し怪しいと思っています。バグだとしても Net::HTTP か Timeout のバグ
だと思いますが。ちなみに再現させる方法はもちろんわかりません。

3) この状況に対して、open-uri のユーザはどのように対処することが要求
されているのでしょうか。4 つ思いつきました。

  A. StandardError を rescue してまとめて対処する

  B. open-uri が投げうる例外をすべて把握し、個々に対処するコードを書く

  C. そもそも robust 性が要求されるプログラムで open-uri や Net::HTTP
     を使うことが想定されていないので、使ってはいけない

  D. そもそも robust 性が要求されるプログラムで Ruby を (略)


ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux] で申し訳ないのです
が、それぞれの例外が投げられたときのトレースを以下に貼り付けます。


/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:53:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:93: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/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/open-uri.rb:277:in `open_http': 400 Bad Request
(OpenURI::HTTPError)
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/net/protocol.rb:135:in `sysread': Connection reset
by peer (Errno::ECONNRESET)
        from /usr/lib/ruby/1.8/net/protocol.rb:135:in `rbuf_fill'
        from /usr/lib/ruby/1.8/timeout.rb:62:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:93:in `timeout'
        from /usr/lib/ruby/1.8/net/protocol.rb:134:in `rbuf_fill'
        from /usr/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
        from /usr/lib/ruby/1.8/net/protocol.rb:126:in `readline'
        from /usr/lib/ruby/1.8/net/http.rb:2020:in `read_status_line'
        from /usr/lib/ruby/1.8/net/http.rb:2009:in `read_new'
        from /usr/lib/ruby/1.8/net/http.rb:1050:in `request'
        from /usr/lib/ruby/1.8/open-uri.rb:248:in `open_http'
        from /usr/lib/ruby/1.8/net/http.rb:543:in `start'
        from /usr/lib/ruby/1.8/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/timeout.rb:60:in `rbuf_fill': execution expired
(Timeout::Error)
        from /usr/lib/ruby/1.8/net/protocol.rb:134:in `rbuf_fill'
        from /usr/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
        from /usr/lib/ruby/1.8/net/protocol.rb:126:in `readline'
        from /usr/lib/ruby/1.8/net/http.rb:2020:in `read_status_line'
        from /usr/lib/ruby/1.8/net/http.rb:2009:in `read_new'
        from /usr/lib/ruby/1.8/net/http.rb:1050:in `request'
        from /usr/lib/ruby/1.8/open-uri.rb:248:in `open_http'
        from /usr/lib/ruby/1.8/net/http.rb:543:in `start'
        from /usr/lib/ruby/1.8/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/net/protocol.rb:135:in `sysread': end of file
reached (EOFError)
        from /usr/lib/ruby/1.8/net/protocol.rb:135:in `rbuf_fill'
        from /usr/lib/ruby/1.8/timeout.rb:62:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:93:in `timeout'
        from /usr/lib/ruby/1.8/net/protocol.rb:134:in `rbuf_fill'
        from /usr/lib/ruby/1.8/net/protocol.rb:116:in `readuntil'
        from /usr/lib/ruby/1.8/net/protocol.rb:126:in `readline'
        from /usr/lib/ruby/1.8/net/http.rb:2020:in `read_status_line'
        from /usr/lib/ruby/1.8/net/http.rb:2009:in `read_new'
        from /usr/lib/ruby/1.8/net/http.rb:1050:in `request'
        from /usr/lib/ruby/1.8/open-uri.rb:248:in `open_http'
        from /usr/lib/ruby/1.8/net/http.rb:543:in `start'
        from /usr/lib/ruby/1.8/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/net/http.rb:560:in `initialize': No route to host -
connect(2) (Errno::EHOSTUNREACH)
        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:53:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:93: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/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'


/usr/lib/ruby/1.8/net/http.rb:560:in `initialize': getaddrinfo:
Temporary failure in name resolution (SocketError)
        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:53:in `timeout'
        from /usr/lib/ruby/1.8/timeout.rb:93: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/open-uri.rb:242:in `open_http'
        from /usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
        from /usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
        from /usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
        from /usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
        from /usr/lib/ruby/1.8/open-uri.rb:518:in `open'
        from /usr/lib/ruby/1.8/open-uri.rb:30:in `open'

-- 
Yusuke ENDOH <mame@tsg.ne.jp>

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[#39412] rb_origenviron — "U.Nakamura" <usa@...>

[#39413] Enumerator#next の挙動が1.8.7とtrunkとで異なる — KAKUTANI Shintaro <shintaro@...>

[#39420] Marshal.load で例外発生時に Segmentation fault エラー — patamanta@...

[#39421] exception from open-uri — Yusuke ENDOH <mame@...>

[#39423] [Bug:1.9] Ripper.new("proc{|;y|}").parse needs more than 100Mbytes. — Tanaka Akira <akr@...>

[#39425] core dump with marshal — Tanaka Akira <akr@...>

[#39432] Re: Marshal.load で例外発生時に Segmentation faultエラー — patamanta@...

[#39434] Re: Marshal.load で例外発生時に Segmentation faultエラー — patamanta@...

[#39436] Re: Marshal.load で例外発生時に Segmentation faultエラー — patamanta@...

[#39439] [Bug #2179] 1.9.2において block のスコープがおかしいときがある — 益隆 三村 <redmine@...>

[#39444] [Bug:1.9] 漢字がprintableと見なされない — Nobuyoshi Nakada <nobu@...>

[#39446] Is the maintainer discharging rule approved? and about matrix.rb — Yugui <yugui@...>

[#39451] getaddrinfo: Name or service not known (SocketError) in net/ftp — Tanaka Akira <akr@...>

[#39452] [Bug #2187] Net::IMAP::ResponseParseError — Masahiro Tomita <redmine@...>

[#39453] [BUG: trunk] GC mark bug — SASADA Koichi <ko1@...>

[#39454] [Bug #1031] -U オプションの説明が --help にない — Yui NARUSE <redmine@...>

[#39455] [Bug #843](Assigned) RubyGems include useless libraries — Yui NARUSE <redmine@...>

[#39459] [Bug #1787] URI ライブラリの正規表現パターン — drry <redmine@...>

[#39460] [Feature #1840](Rejected) Hash に要素追加して self を返すメソッド — Yui NARUSE <redmine@...>

[#39463] [Bug #843] RubyGems include useless libraries — Nobuyoshi Nakada <redmine@...>

[#39464] [Bug #853](Closed) Rake のテストが無い — Nobuyoshi Nakada <redmine@...>

[#39465] [bug:trunk] prime and timeout — Tanaka Akira <akr@...>

[#39467] [p 3,4] is syntax error in trunk — masayoshi takahashi <maki@...>

[#39474] BigDecimal#to_i/to_int の挙動について — KAKUTANI Shintaro <shintaro@...>

[#39479] 一度IO::reopenしたファイルに対して同一ファイルでIO::reopenしたときの挙動について — takkanm@...

[#39483] [Bug #2208] Exception#inspect の message 部が inspect されていない — Yui NARUSE <redmine@...>

[#39487] [bug:trunk] loop by Iconv.open("foo", "bar") {|x| p x } — Tanaka Akira <akr@...>

[#39491] [Bug #2208](Assigned) Exception#inspect の message 部が inspect されていない — Yui NARUSE <redmine@...>

[#39498] SimpleDelegator.new(0).method(:succ): delegator does not forward private methods — Tanaka Akira <akr@...>

[#39499] sockaddr_storageのメンバ — Yutaka Kanemoto <kinpoco@...>

[#39501] [bug:trunk] invalid memory access in 100**900 — Tanaka Akira <akr@...>

[#39506] [Bug:1.9] case 文の式が省略され when 節に配列展開があるときの挙動 — wanabe <s.wanabe@...>

[#39511] [Bug #2208](Rejected) Exception#inspect の message 部が inspect されていない — Yui NARUSE <redmine@...>

[#39515] [Bug #2237] Interoperability between 1.8 and 1.9 through Marshal — Yuki Sonoda <redmine@...>

[#39529] [Feature #2060](Feedback) DLをCからRubyに変換する事を勧めます — Yui NARUSE <redmine@...>

[#39533] [Bug #2263] typo in man/ruby.1 — Narihiro Nakamura <redmine@...>

[#39546] [RubySpec #2290] File.newに与えたエンコーディングは、to_pathで保持されるでしょうか? — 益隆 三村 <redmine@...>

[#39548] [Bug #2291] Net::FTPでソケットをオープンする前にbinary=を呼び出すと落ちる — Akira Matsuda <redmine@...>

[#39550] [Bug #2292] 不正なマルチバイトStringのinspect結果にゴミが入る — Nobuyoshi Nakada <redmine@...>

[#39551] [Feature #2293] StringIOにread_nonblcokが欲しいです — 益隆 三村 <redmine@...>

[#39560] [Bug #1406](Rejected) i386-freebsd5.4 で ruby_1_9_1 がコンパイルできない — Yui NARUSE <redmine@...>

[#39563] [Bug #2296] Dir.home(0)でTypeErrorが出る — Hiro Asari <redmine@...>

[#39574] [Bug #2302] Encoding.filesystem_encoding — Usaku NAKAMURA <redmine@...>

[#39578] [Bug #2308] セーフレベル1の場合、Net::IMAPでSecurityErrorが発生する — Nozomu Kurasawa <redmine@...>

[#39579] [Bug #2310] should ensure GVL_UNLOCK_END in rb_thread_blocking_region — _ wanabe <redmine@...>

[#39581] [Bug:trunk] NoMethodError message "no superclass method" — Nobuyoshi Nakada <nobu@...>

[#39584] Re: [ruby-cvs:32774] Ruby:r25556 (trunk): * array.c (rb_ary_to_ary): do not use #respond_to? to detect — Nobuyoshi Nakada <nobu@...>

[#39586] Re: [ruby-cvs:32789] Ruby:r25571 (trunk): * test/ruby/test_enum.rb (test_count): test for [ruby-core:24794]. — Yukihiro Matsumoto <matz@...>

[#39592] infinite recursive call to C function — Yusuke ENDOH <mame@...>

[#39593] infinite recursive rb_block_call — Yusuke ENDOH <mame@...>

[ruby-dev:39421] exception from open-uri

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In This Thread

[#39439] [Bug #2179] 1.9.2において block のスコープがおかしいときがある — 益隆三村 <redmine@...>

[#39459] [Bug #1787] URI ライブラリの正規表現パターン — drry 　 <redmine@...>

[#39546] [RubySpec #2290] File.newに与えたエンコーディングは、to_pathで保持されるでしょうか? — 益隆三村 <redmine@...>

[#39551] [Feature #2293] StringIOにread_nonblcokが欲しいです — 益隆三村 <redmine@...>