狂欢版：’3.1.1′

TlDr：
如何在Rails 4应用程序的中间件中获取路径as / api / products /：id或控制器以及该路由的操作.

细节：

我在rails应用程序中添加了一个类似于gem scout_statsd_rack的中间件.这会将以下middleware添加到rails应用程序以通过statsd发送指标：

def call(env)
  (status,headers,body),response_time = call_with_timing(env)
  statsd.timing("#{env['REQUEST_PATH']}.response",response_time)
  statsd.increment("#{env['REQUEST_PATH']}.response_codes.#{status.to_s.gsub(/\d{2}$/,'xx')}")
  # Rack response
  [status,body]
rescue Exception => exception
  statsd.increment("#{env['REQUEST_PATH']}.response_codes.5xx")
  raise
end
 
def call_with_timing(env)
  start = Time.now
  result = @app.call(env)
  [result,((Time.now - start) * 1000).round]
end

我想要的是在中间件中找到当前路由,以便我可以发送特定于每个路由的度量.

我尝试了描述here的方法,它告诉env [‘PATH_INFO’]可以提供路径,但是它提供了这样的URL参数：/ api / products / 4但我想要的是/ api / products /：id as我的目的是跟踪/ api / products /：id API的性能.

env [‘REQUEST_PATH’]和env [‘REQUEST_URI’]也给出相同的响应.

我尝试了here和here提供的答案：

Rails.application.routes.router.recognize({"path_info" => env['PATH_INFO']})

或者像这样

Rails.application.routes.router.recognize(env['PATH_INFO'])

但它给出了以下错误：

NoMethodError (undefined method path_info' for {"path_info"=>"/api/v1/products/4"}:Hash):
vendor/bundle/gems/actionpack-4.2.7.1/lib/action_dispatch/journey/router.rb:100:infind_routes’
vendor/bundle/gems/actionpack-4.2.7.1/lib/action_dispatch/journey/router.rb:59:in recognize'
vendor/bundle/gems/scout_statsd_rack-0.1.7/lib/scout_statsd_rack.rb:27:in
call’

这个answer讨论了request.original_url,但是我如何访问变量请求,我认为它应该与env相同但不能从中获取路由.

编辑#1

您可以看到示例仓库here,其中包含rails中间件here的代码,可以按照README中的说明完成此设置,并且可以命中此API：http：// localhost：3000 / api / v1 / products / 1.

编辑#2

我试过@MichałMłoźniak给出的方法如下：

def call(env)
  (status,response_time = call_with_timing(env)
  request = ActionDispatch::Request.new(env)
  request = Rack::Request.new("PATH_INFO" => env['REQUEST_PATH'],"REQUEST_METHOD" => env["REQUEST_METHOD"])
  Rails.application.routes.router.recognize(request) { |route,params|
    puts "I am here"
     puts params.inspect
     puts route.inspect
   }

但我得到了以下回应：

I am here 
{}
#<ActionDispatch::Journey::Route:0x007fa1833ac628 @name="spree",@app=#<ActionDispatch::Routing::Mapper::Constraints:0x007fa1833ace70 @dispatcher=false,@app=Spree::Core::Engine,@constraints=[]>,@path=#<ActionDispatch::Journey::Path::Pattern:0x007fa1833acc90 @spec=#<ActionDispatch::Journey::Nodes::Slash:0x007fa1833ad230 @left="/",@memo=nil>,@requirements={},@separators="/.?",@anchored=false,@names=[],@optional_names=[],@required_names=[],@re=/\A\//,@offsets=[0]>,@constraints={:required_defaults=>[]},@defaults={},@required_defaults=nil,@required_parts=[],@parts=[],@decorated_ast=nil,@precedence=1,@path_formatter=#<ActionDispatch::Journey::Format:0x007fa1833ac588 @parts=["/"],@children=[],@parameters=[]>>

我也推动了这些变化here.