机架投掷EOFError（坏内容体）

时间：2014-09-16 17:00:28

标签： jquery ruby-on-rails ruby rack

我们正在使用Ruby 2.1.2，Rails 3.2.19和JQuery 1.11，资源管道没有被使用（所以不使用JQuery-ujs，而是明确地使用相关的rails.js）。对于大多数用户来说，JQuery和其他相关的常见插件都是从谷歌CDN中提取的（包括jquery.form 3.50）。受影响的Web服务器是Ubuntu 14.04，Nginx 1.6和Passenger 4.x。

对于我们生产服务器上大约10％的用户（负载似乎无关紧要），我们正在获得这样的堆栈转储，主要是针对一个URL，但还有其他一些：

/gems/rack-1.4.5/lib/rack/multipart/parser.rb:74 in "block in fast_forward_to_first_boundary"
/gems/rack-1.4.5/lib/rack/multipart/parser.rb:72 in "loop"
/gems/rack-1.4.5/lib/rack/multipart/parser.rb:72 in "fast_forward_to_first_boundary"
/gems/rack-1.4.5/lib/rack/multipart/parser.rb:15 in "parse"
/gems/rack-1.4.5/lib/rack/multipart.rb:25 in "parse_multipart"
/gems/rack-1.4.5/lib/rack/request.rb:336 in "parse_multipart"
/gems/rack-1.4.5/lib/rack/request.rb:201 in "POST"
/gems/actionpack-3.2.19/lib/action_dispatch/http/request.rb:237 in "POST"
/gems/actionpack-3.2.19/lib/action_dispatch/http/parameters.rb:10 in "parameters"
/gems/actionpack-3.2.19/lib/action_dispatch/http/filter_parameters.rb:31 in "filtered_parameters"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/rails3/action_controller.rb:31 in "process_action"
/gems/actionpack-3.2.19/lib/abstract_controller/base.rb:121 in "process"
/gems/actionpack-3.2.19/lib/abstract_controller/rendering.rb:45 in "process"
/gems/actionpack-3.2.19/lib/action_controller/metal.rb:203 in "dispatch"
/gems/actionpack-3.2.19/lib/action_controller/metal/rack_delegation.rb:14 in "dispatch"
/gems/actionpack-3.2.19/lib/action_controller/metal.rb:246 in "block in action"
/gems/actionpack-3.2.19/lib/action_dispatch/routing/route_set.rb:73 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/routing/route_set.rb:73 in "dispatch"
/gems/actionpack-3.2.19/lib/action_dispatch/routing/route_set.rb:36 in "call"
/gems/journey-1.0.4/lib/journey/router.rb:68 in "block in call"
/gems/journey-1.0.4/lib/journey/router.rb:56 in "each"
/gems/journey-1.0.4/lib/journey/router.rb:56 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/routing/route_set.rb:608 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/rack/error_collector.rb:50 in "traced_call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:55 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/rack/agent_hooks.rb:26 in "traced_call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:55 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/rack/browser_monitoring.rb:23 in "traced_call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:55 in "call"
/gems/oink-0.10.1/lib/oink/middleware.rb:17 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/warden-1.2.3/lib/warden/manager.rb:35 in "block in call"
/gems/warden-1.2.3/lib/warden/manager.rb:34 in "catch"
/gems/warden-1.2.3/lib/warden/manager.rb:34 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/best_standards_support.rb:17 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/etag.rb:23 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/conditionalget.rb:25 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/head.rb:14 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/params_parser.rb:21 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/flash.rb:242 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:210 in "context"
/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:205 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/cookies.rb:341 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/activerecord-3.2.19/lib/active_record/query_cache.rb:64 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/activerecord-3.2.19/lib/active_record/connection_adapters/abstract/connection_pool.rb:479 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/callbacks.rb:28 in "block in call"
/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405 in "_run__3807242266783802268__call__1942732928323145202__callbacks"
/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:405 in "__run_callback"
/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:385 in "_run_call_callbacks"
/gems/activesupport-3.2.19/lib/active_support/callbacks.rb:81 in "run_callbacks"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/callbacks.rb:27 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/sendfile.rb:102 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/remote_ip.rb:31 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/debug_exceptions.rb:16 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/show_exceptions.rb:56 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/railties-3.2.19/lib/rails/rack/logger.rb:32 in "call_app"
/gems/railties-3.2.19/lib/rails/rack/logger.rb:18 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/actionpack-3.2.19/lib/action_dispatch/middleware/request_id.rb:22 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/methodoverride.rb:21 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/runtime.rb:17 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/activesupport-3.2.19/lib/active_support/cache/strategy/local_cache.rb:72 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-1.4.5/lib/rack/lock.rb:15 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/rack-cache-1.2/lib/rack/cache/context.rb:136 in "forward"
/gems/rack-cache-1.2/lib/rack/cache/context.rb:245 in "fetch"
/gems/rack-cache-1.2/lib/rack/cache/context.rb:185 in "lookup"
/gems/rack-cache-1.2/lib/rack/cache/context.rb:66 in "call!"
/gems/rack-cache-1.2/lib/rack/cache/context.rb:51 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/railties-3.2.19/lib/rails/engine.rb:484 in "call"
/gems/railties-3.2.19/lib/rails/application.rb:231 in "call"
/gems/railties-3.2.19/lib/rails/railtie/configurable.rb:30 in "method_missing"
/gems/rack-1.4.5/lib/rack/urlmap.rb:64 in "block in call"
/gems/rack-1.4.5/lib/rack/urlmap.rb:49 in "each"
/gems/rack-1.4.5/lib/rack/urlmap.rb:49 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/gems/sass-3.2.19/lib/sass/plugin/rack.rb:54 in "call"
/gems/newrelic_rpm-3.9.3.241/lib/new_relic/agent/instrumentation/middleware_tracing.rb:57 in "call"
/var/www/.rvm/gems/ruby-2.1.2/gems/passenger-4.0.45/lib/phusion_passenger/rack/thread_handler_extension.rb:74 in "process_request"
/var/www/.rvm/gems/ruby-2.1.2/gems/passenger-4.0.45/lib/phusion_passenger/request_handler/thread_handler.rb:141 in "accept_and_process_next_request"
/var/www/.rvm/gems/ruby-2.1.2/gems/passenger-4.0.45/lib/phusion_passenger/request_handler/thread_handler.rb:109 in "main_loop"
/var/www/.rvm/gems/ruby-2.1.2/gems/passenger-4.0.45/lib/phusion_passenger/request_handler.rb:448 in "block (3 levels) in start_threads"

在从1.5（！）升级到JQuery 1.11之前，此错误没有发生（或者如果发生错误，则非常罕见）。到目前为止，我们无法在登台服务器或开发环境中重现此错误。一个支持人员曾经在生产过程中看过它（我已多次尝试过），但是在分期时无法复制（这与生产环境相同，但资源较少）。 JQuery migrate在运行时没有出现任何问题，正如我所说，它似乎适用于大多数用户;在调试会话期间似乎没有什么不妥。操作系统/平台或浏览器没有明显的模式（试图在几个和日志上重现并不是表示模式虽然很难筛选到足以确定）。涉及的主要URL是表单控制器上的#new操作。我们在平台上有其他几种形式，它们没有任何问题。

由于我无法重现它，因此无法提供代码段 - 我不知道该指出什么。

到目前为止我对错误的解释（基于堆栈转储中的第一行）是以下三个方面之一：

  1. 内容是正确的，但不是以某种方式完全形成，
  2. 内容形成不佳表明存在Ruby错误（尽管如此 也许JS）
  3. 糟糕的编码（我在Ruby中使用form_for甚至是 投入＆＃34; multipart：true＆＃34;要明确）

    4. 我看到Rack在4.x中处理了一个相关的多部分EOFError问题，但我们正在运行Rails 3.2.19，它将我们锁定在旧版本并且升级到Rails 4.x目前不实用。作为测试，我已经尝试将JQuery恢复到低至1.7，但似乎没有改变行为（任何年龄较大，我不得不放弃JQuery 1.8 +所需的代码更新）。 / p>

    由于JQuery代码需要更改我们的JS，我怀疑我错过了一些必要的JS更改，但似乎没有什么不妥。附近还有一些CSS更改，但我不知道这会如何影响事物（因为一切都在我们的各种测试环境中传递，其他更改也包含在部署中）。

    我一直怀疑JS问题，但是对生产进行了一些有限的测试（我必须小心在现场服务器上，因此不能过于激进）还没有显示任何线索或抛出任何看似相关的错误。

    作为背景，我有大约一年的Ruby和JS经验（虽然在其他编程平台上还有很多年），所以完全有可能是我不熟悉的基础知识。

    我很难缩小到哪里集中精力来处理这个问题。有任何建议可以诊断或解决？

    更新（10/11/14）我修补Rack::Multipart::Parser.fast_forward_to_first_boundary（谢谢，Isaac Betesh！）添加日志跟踪并确认传递给解析器的内容为空时到达该函数（即，在多部分解析期间由@env['rack.input']引用的StringIO不返回任何数据）。我现在的理论是，当没有数据时，它会错误地预期多部分数据。同样，这只是间歇性地发生，并且对于同一页面的许多其他调用进行解析。由于我们在Passenger 4.x和Nginx下运行，我没有排除缓冲问题。

1 个答案:

答案 0 :(得分：8)

这终于解决了，我发布了所发生的事情，以防它对别人有帮助。

摘要原始代码在JS中包含一个ajaxSubmit（通过jquery.form插件），它提交了一个带有multipart / form-data编码的表单（作为POST）（到目前为止一直很好）。处理提交的rails控制器正常处理数据，然后重定向到第二个href（作为GET）。浏览器（可能仍然在返回到它的success回调处理程序之前通过jquery.form插件处理）接收到重定向并且保留 multipart / form-data编码类型。当机架收到仍然指定了多部分编码的GET时，它会拒绝，因为没有要解析的多部分数据。

对不起，我的OP中的大部分内容都没有证据。我不清楚为什么它在旧版本的JQuery和JQuery.form插件下运行，或者为什么它有时在新的JQuery / JQuery.form下成功。

解决方案重构控制器不再重定向，而是返回原始ajaxSubmit的success回调处理程序的URL（作为文本呈现）。然后，success处理程序在返回的URL上执行AJAX GET，从而使工作流保持不变，但避免在GET请求上进行任何多部分编码。

tl; dr ：

在代码被更改之前，我们有一个涉及Jquery.form的路径就是这样的（代码示例并不意味着可执行，但仅作为说明）：

Ruby视图（在提交表单的HAML中）：

= form_for @someObject, html: {:multipart => true, :class => "someformclass"} do |f|
  = f.error_messages
  = hidden_field_tag :submitted, true
  =# some more fields
  %p.submits
    = f.submit "Submit", class: "submit"

Ruby控制器：

class OurController < ApplicationController
  layout false
  before_filter :authenticate_user!

  # some other actions

  def create
    # some processing

    someObject.save
    redirect_to new_feedback_path, :method => :get, :notice => "notice text", status: 303
  end

  # some other actions
end

JS ：

$(document).on('click', '.someformclass .submit', function() {
  ...
  $(this).parents('form').ajaxSubmit({     // uses jquery.form
    ...
    beforeSubmit: function(someargs) {
      ... blah blah
    },
    success: function(responseText) {
      // ... code to display flash message
      if (typeof(window.history.pushState) == 'function') {
        window.history.pushState('html', 'sometext', $.cookie('current_url'));
        matchFiltersClass(window.location.pathname);
      } else {
        window.location.hash = '#!' + $.cookie('current_path');
        matchFiltersClass($.cookie('current_path'));
      }
      $('#main_content').html(responseText);
    }
  });
  return false;
});

这被重构如下（再次，只是一个例子）：

Ruby视图（在提交表单的HAML中）：不变

Ruby控制器：

class OurController < ApplicationController
  layout false
  before_filter :authenticate_user!

  # some other actions

  def create
    # some processing

    someObject.save
    flash[:notice] = 'notice text'    # NEW LINE
    render text: new_feedback path, status: accepted  #CHANGED LINE
  end

  # some other actions
end

JS ：

$(document).on('click', '.someformclass .submit', function() {
  ...
  $(this).parents('form').ajaxSubmit({     // uses jquery.form
    ...
    beforeSubmit: function(someargs) {
      ... blah blah
    },
    success: function(responseText) {
      // ... code to display flash message
      $.get(responseText, function(data) {       // NEW LINE
        if (typeof(window.history.pushState) == 'function') {
          window.history.pushState('html', 'sometext', $.cookie('current_url'));
          matchFiltersClass(window.location.pathname);
        } else {
          window.location.hash = '#!' + $.cookie('current_path');
          matchFiltersClass($.cookie('current_path'));
        }
        $('#main_content').html(responseText);
      });       // NEW LINE
    }
  });
  return false;
});

在本地开发人员的帮助下找到了这个解决方案（感谢Dan Axtman！）并且在Rack中进行猴子修补记录并不是没有相当多的时间（谢谢，Isaac Betesh！）。至少我在这个过程中学到了关于Rack和猴子补丁的一些内容......

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