Sinatra错误 - 继续调用线程

Question

我对Ruby完全陌生，所以我的问题可能有一个相当简单的答案。但是，我无法在stackoverflow上找到答案。 我有以下非常简单的末日应用：

# myapp.rb 
require 'rubygems' 
require 'sinatra' 
require 'json' 

range=(199..2000).step(1) 

set :port, 8888 

get '/hostname' do 
    content_type :json 
    return range.next.to_json 
end 

西纳特拉开始：

ruby testsinatra.rb 
== Sinatra/1.0 has taken the stage on 8888 for development with backup from WEBrick 
[2014-09-11 08:43:18] INFO WEBrick 1.3.1 
[2014-09-11 08:43:18] INFO ruby 1.8.7 (2011-06-30) [x86_64-linux] 
[2014-09-11 08:43:18] INFO WEBrick::HTTPServer#start: pid=8215 port=8888 

和服务第一个请求：

curl -ks http://localhost:8888/hostname 
199 

但在第二个请求中的错误而失败：

RuntimeError - 跨线程继续调用：

/usr/lib/ruby/1.8/generator.rb:131:in `call' 
/usr/lib/ruby/1.8/generator.rb:131:in `next' 
/usr/lib/ruby/1.8/generator.rb:189:in `next' 
testsinatra.rb:30:in `GET /hostname' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:863:in `call' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:863:in `route' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `route!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `route!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call' 
/usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/showexceptions.rb:24:in `call' 
/usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/methodoverride.rb:21:in `call' 
/usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:1003:in `synchronize' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:1003:in `synchronize' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call' 
/usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service' 
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' 
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' 
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' 
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start' 
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' 
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start' 
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each' 
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start' 
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start' 
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start' 
/usr/lib/ruby/gems/1.8/gems/rack-1.5.2/lib/rack/handler/webrick.rb:14:in `run' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/base.rb:946:in `run!' 
/usr/lib/ruby/gems/1.8/gems/sinatra-1.0/lib/sinatra/main.rb:25 
testsinatra.rb:27 

很明显，我错过了一些基本的东西。请指教。

Answer 1

测试代码给出：

FiberError at /hostname 
fiber called across threads 

你可以在这里找到一个相关的问题：Sharing an enumerator across threads。看起来Fiber代码存储了访问该对象的第一个线程的ID，并在另一个线程尝试这样做时立即失败。你显然不能在线程之间共享枚举器，并且必须采用不同的方法。

请注意，全局变量可能会被不同的线程同时访问，您应该始终使用线程安全的对象或显式锁定。