在Mongrel处理程序的URI中使用正则表达式

Question

我目前正在使用Mongrel开发自定义Web应用程序项目.

我希望Mongrel使用基于正则表达式的定义的Http Handler.例如,每当有人调用http://test/bla1.js或http://test/bla2.js这样的URL时,就会调用相同的Http处理程序来管理请求.

到目前为止我的代码看起来像这样:

http_server = Mongrel::Configurator.new :host => config.get("http_host") do
  listener :port => config.get("http_port") do

    uri Regexp.escape("/[a-z0-9]+.js"), :handler => BLAH::CustomHandler.new
    uri '/ui/public', :handler => Mongrel::DirHandler.new("#{$d}/public/")
    uri '/favicon', :handler => Mongrel::Error404Handler.new('')

    trap("INT") { stop }
    run
  end
end

正如你所看到的,我试图在这里使用正则表达式而不是字符串:

 uri Regexp.escape("/[a-z0-9]+.js"), :handler => BLAH::CustomHandler.new

但这不起作用.有解决方案吗

感谢那.

Answer 1

您必须将新代码注入 Mongrel 的一部分URIClassifier，否则 Mongrel 完全不知道正则表达式 URI。

以下是实现此目的的一种方法：

#
# Must do the following BEFORE Mongrel::Configurator.new
#  Augment some of the key methods in Mongrel::URIClassifier
#  See lib/ruby/gems/XXX/gems/mongrel-1.1.5/lib/mongrel/uri_classifier.rb
#
Mongrel::URIClassifier.class_eval <<-EOS, __FILE__, __LINE__
  # Save original methods
  alias_method :register_without_regexp, :register
  alias_method :unregister_without_regexp, :unregister
  alias_method :resolve_without_regexp, :resolve

  def register(uri, handler)
    if uri.is_a?(Regexp)
      unless (@regexp_handlers ||= []).any? { |(re,h)| re==uri ? h.concat(handler) : false }
        @regexp_handlers << [ uri, handler ]
      end
    else
      # Original behaviour
      register_without_regexp(uri, handler)
    end
  end

  def unregister(uri)
    if uri.is_a?(Regexp)
      raise Mongrel::URIClassifier::RegistrationError, "\#{uri.inspect} was not registered" unless (@regexp_handlers ||= []).reject! { |(re,h)| re==uri }
    else
      # Original behaviour
      unregister_without_regexp(uri)
    end
  end

  def resolve(request_uri)
    # Try original behaviour FIRST
    result = resolve_without_regexp(request_uri)
    # If a match is not found with non-regexp URIs, try regexp
    if result[0].blank?
      (@regexp_handlers ||= []).any? { |(re,h)| (m = re.match(request_uri)) ? (result = [ m.pre_match + m.to_s, (m.to_s == Mongrel::Const::SLASH ? request_uri : m.post_match), h ]) : false }
    end
    result
  end
EOS

http_server = Mongrel::Configurator.new :host => config.get("http_host") do 
  listener :port => config.get("http_port") do 

    # Can pass a regular expression as URI
    #  (URI must be of type Regexp, no escaping please!)
    # Regular expression can match any part of an URL, start with "^/..." to
    #  anchor match at URI beginning.
    # The way this is implemented, regexp matches are only evaluated AFTER
    #  all non-regexp matches have failed (mostly for performance reasons.)
    # Also, for regexp URIs, the :in_front is ignored; adding multiple handlers
    #  to the same URI regexp behaves as if :in_front => false
    uri /^[a-z0-9]+.js/, :handler => BLAH::CustomHandler.new 

    uri '/ui/public', :handler => Mongrel::DirHandler.new("#{$d}/public/") 
    uri '/favicon', :handler => Mongrel::Error404Handler.new('') 

    trap("INT") { stop } 
    run 
  end 
end

似乎与 Mongrel 1.1.5 配合得很好。