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ruby on rails? web dev's? spoon feed me...


i8igmac
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ruby on rails

so, im updating this post... server sent events is the new subject... with use of actioncontroller::live i can do live streaming of data with my web browser...

ill post some example code that has allowed me to run a linux application on my web server, stream each line as live output to the web browser...

when the command completes the page will respond with a DONe message...

it was a little tricky finding exmaples that worked well enough to build off...

/app/controllers/messaging_controller.rb

require 'open3'
class MessagingController < ApplicationController
	include ActionController::Live
  def send_message
    response.headers['Content-Type'] = 'text/event-stream'
    #response.stream.write "data: #{l.chomp.to_json}\n\n"
    #run a application, until it finishes
    Open3.popen3("ping -c 10 google.com"){|i,o,t,p| 
    	while l=o.gets
    		response.stream.write "data: #{l.chomp.to_json}\n\n"
    	end}

    	#kill the process on completion
    	response.stream.write "data: kill_stream\n\n"
    rescue IOError
    	puts "error"
    rescue ClientDisconnected
    	puts "he discconected"
	ensure
    response.stream.close
  end
end

this will run `ping -c 10 google.com` and send each line to the web browser.

when the execution completes, this controller will send the client a kill_stream message.

here is a index file that will connect to the action controller and display the stream as it happens...

there is a #progress id and a #Kill id... each message will show in the appropriate div...

/app/views/messaging/index.html.erb

<div class="container-fluid">
<h3>Completion</h3>
<div class="panel panel-default">
	<div class="panel-body">
		<div id="kill"></div>
	</div>
</div>

<hr />

<h3>Progress</h3>
<div class="panel panel-default">
	<div class="panel-body label-success">
		<div id="progress"></div>
		</div>
	</div>
</div>





<script type="text/javascript">
  jQuery(document).ready(function() {
    setTimeout(function() {
      var source = new EventSource('/messaging');
      function eventLogger(event){
        
        if (event.data == 'kill_stream') {
        	$("#kill").append("DONE.." + "<br>");
        	source.close()
        } else {
        	$("#progress").prepend(event.data + "<br>");
        }

      }
      source.onmessage = eventLogger;
    }, 10);
  });
</script>

and you need to modify your routes.rb

/config/routes.rb

root 'messaging#index'
get 'messaging' => 'messaging#send_message'
Edited by i8igmac
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