diff options
Diffstat (limited to 'actionpack/lib/action_controller/metal/live.rb')
| -rw-r--r-- | actionpack/lib/action_controller/metal/live.rb | 163 |
1 files changed, 91 insertions, 72 deletions
diff --git a/actionpack/lib/action_controller/metal/live.rb b/actionpack/lib/action_controller/metal/live.rb index 6804e577f0..083b762f5a 100644 --- a/actionpack/lib/action_controller/metal/live.rb +++ b/actionpack/lib/action_controller/metal/live.rb @@ -1,9 +1,11 @@ -require 'action_dispatch/http/response' -require 'delegate' -require 'active_support/json' +# frozen_string_literal: true + +require "action_dispatch/http/response" +require "delegate" +require "active_support/json" module ActionController - # Mix this module in to your controller, and all actions in that controller + # Mix this module into your controller, and all actions in that controller # will be able to stream data to the client as it's written. # # class MyController < ActionController::Base @@ -20,7 +22,7 @@ module ActionController # end # end # - # There are a few caveats with this use. You *cannot* write headers after the + # There are a few caveats with this module. You *cannot* write headers after the # response has been committed (Response#committed? will return truthy). # Calling +write+ or +close+ on the response stream will cause the response # object to be committed. Make sure all headers are set before calling write @@ -36,8 +38,7 @@ module ActionController extend ActiveSupport::Concern module ClassMethods - def make_response!(response) - request = response.request + def make_response!(request) if request.get_header("HTTP_VERSION") == "HTTP/1.0" super else @@ -85,8 +86,7 @@ module ActionController # Note: SSEs are not currently supported by IE. However, they are supported # by Chrome, Firefox, Opera, and Safari. class SSE - - WHITELISTED_OPTIONS = %w( retry event id ) + PERMITTED_OPTIONS = %w( retry event id ) def initialize(stream, options = {}) @stream = stream @@ -111,13 +111,13 @@ module ActionController def perform_write(json, options) current_options = @options.merge(options).stringify_keys - WHITELISTED_OPTIONS.each do |option_name| + PERMITTED_OPTIONS.each do |option_name| if (option_value = current_options[option_name]) @stream.write "#{option_name}: #{option_value}\n" end end - message = json.gsub("\n".freeze, "\ndata: ".freeze) + message = json.gsub("\n", "\ndata: ") @stream.write "data: #{message}\n\n" end end @@ -164,14 +164,6 @@ module ActionController end end - def each - @response.sending! - while str = @buf.pop - yield str - end - @response.sent! - end - # Write a 'close' event to the buffer; the producer/writing thread # uses this to notify us that it's finished supplying content. # @@ -211,23 +203,36 @@ module ActionController def call_on_error @error_callback.call end + + private + + def each_chunk(&block) + loop do + str = nil + ActiveSupport::Dependencies.interlock.permit_concurrent_loads do + str = @buf.pop + end + break unless str + yield str + end + end end class Response < ActionDispatch::Response #:nodoc: all private - def before_committed - super - jar = request.cookie_jar - # The response can be committed multiple times - jar.write self unless committed? - end + def before_committed + super + jar = request.cookie_jar + # The response can be committed multiple times + jar.write self unless committed? + end - def build_buffer(response, body) - buf = Live::Buffer.new response - body.each { |part| buf.write part } - buf - end + def build_buffer(response, body) + buf = Live::Buffer.new response + body.each { |part| buf.write part } + buf + end end def process(name) @@ -236,51 +241,43 @@ module ActionController error = nil # This processes the action in a child thread. It lets us return the - # response code and headers back up the rack stack, and still process - # the body in parallel with sending data to the client - Thread.new { - t2 = Thread.current - t2.abort_on_exception = true - - # Since we're processing the view in a different thread, copy the - # thread locals from the main thread to the child thread. :'( - locals.each { |k,v| t2[k] = v } - - begin - super(name) - rescue => e - if @_response.committed? - begin - @_response.stream.write(ActionView::Base.streaming_completion_on_exception) if request.format == :html - @_response.stream.call_on_error - rescue => exception - log_error(exception) - ensure - log_error(e) - @_response.stream.close + # response code and headers back up the Rack stack, and still process + # the body in parallel with sending data to the client. + new_controller_thread { + ActiveSupport::Dependencies.interlock.running do + t2 = Thread.current + + # Since we're processing the view in a different thread, copy the + # thread locals from the main thread to the child thread. :'( + locals.each { |k, v| t2[k] = v } + + begin + super(name) + rescue => e + if @_response.committed? + begin + @_response.stream.write(ActionView::Base.streaming_completion_on_exception) if request.format == :html + @_response.stream.call_on_error + rescue => exception + log_error(exception) + ensure + log_error(e) + @_response.stream.close + end + else + error = e end - else - error = e + ensure + @_response.commit! end - ensure - @_response.commit! end } - @_response.await_commit - raise error if error - end - - def log_error(exception) - logger = ActionController::Base.logger - return unless logger - - logger.fatal do - message = "\n#{exception.class} (#{exception.message}):\n" - message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code) - message << " " << exception.backtrace.join("\n ") - "#{message}\n\n" + ActiveSupport::Dependencies.interlock.permit_concurrent_loads do + @_response.await_commit end + + raise error if error end def response_body=(body) @@ -288,8 +285,30 @@ module ActionController response.close if response end - def set_response!(response) - @_response = self.class.make_response! response - end + private + + # Spawn a new thread to serve up the controller in. This is to get + # around the fact that Rack isn't based around IOs and we need to use + # a thread to stream data from the response bodies. Nobody should call + # this method except in Rails internals. Seriously! + def new_controller_thread # :nodoc: + Thread.new { + t2 = Thread.current + t2.abort_on_exception = true + yield + } + end + + def log_error(exception) + logger = ActionController::Base.logger + return unless logger + + logger.fatal do + message = +"\n#{exception.class} (#{exception.message}):\n" + message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code) + message << " " << exception.backtrace.join("\n ") + "#{message}\n\n" + end + end end end |