如Ruby on Rails 3: Streaming data through Rails to client中所示进行流式传输时遇到问题,其中after_filter和around_filter在响应之前完成执行。我需要在执行after_filters之前对响应进行流式处理,因为我们依赖于在这些过滤器中清理的数据。我正在使用乘客。
控制器示例:
class Asdf
def each
(1..5).each do |num|
sleep(1)
Rails.logger.info "STREAMING LINE #{num}"
yield "test#{num}\n"
end
end
end
class WelcomeController < ApplicationController
before_filter :before
after_filter :after
around_filter do |controller, action|
logger.debug "around_filter prior to action"
action.call
logger.debug "around_filter after action"
end
def index
self.response.headers['Last-Modified'] = Time.now.to_s
self.response_body = Asdf.new
end
def before
Rails.logger.info "before_filter called"
end
def after
Rails.logger.info "after_filter called"
end
end
示例日志输出(时间反映它是流式传输)
Started GET "/welcome/index" for 192.168.74.64 at 2016-01-25 17:28:17 -0600
Processing by WelcomeController#index as HTML
before_filter called
around_filter prior to action
around_filter after action
after_filter called
Completed 200 OK in 0.7ms (ActiveRecord: 0.0ms)
STREAMING LINE 1
STREAMING LINE 2
STREAMING LINE 3
STREAMING LINE 4
STREAMING LINE 5
答案 0 :(得分:1)
看起来,在迭代器用尽之后,您可能能够在类的around_filter
方法中调用数据清理例程,而不是依赖于each
:
class Asdf
def each
(1..5).each do |num|
sleep(1)
Rails.logger.info "STREAMING LINE #{num}"
yield "test#{num}\n"
end
Rails.logger.info "ALL DONE; READY TO CLEAN UP"
clean_up
end
def clean_up
Rails.logger.info "CLEANING UP"
end
end
在Rails 3.2应用程序中点击welcome#index
操作,在日志中产生了以下内容:
Started GET "/welcome" for 127.0.0.1 at 2016-01-25 18:55:49 -0800
Processing by WelcomeController#index as HTML
before_filter called
around_filter prior to action
around_filter after action
after_filter called
Completed 200 OK in 0.5ms (ActiveRecord: 0.0ms)
STREAMING LINE 1
STREAMING LINE 2
STREAMING LINE 3
STREAMING LINE 4
STREAMING LINE 5
ALL DONE; READY TO CLEAN UP
CLEANING UP