ruby - Rails ActionCable unsubscribe users when browser close -


i'm testing actioncable simple example. want see how many users connected @ time on website. users not registered in system. users assigned session variable uuid. make example simple possible have not included model or database.

#app/controller/users_controller.rb  class userscontroller < applicationcontroller     def index     if session[:user].nil?       session[:user] = securerandom.uuid     end     @user = session[:user]     userbroadcastjob.perform_later @user     end   end

views simple

#app/views/users/index.html.erb  <h1>users</h1>  <div id="users">   <%= render "user",user: @user %> </div>

partial users:

#app/views/users/_user.html.erb  <div class="user">   user : <%= user %> </div>

i use job call socket

#app/jobs/user_broadcast_job.rb  class userbroadcastjob < applicationjob queue_as :default    def perform(user)     actioncable.server.broadcast 'user_channel', message: render_user(user)   end    def render_user(user)     applicationcontroller.renderer.render(partial: 'users/user', locals: { user: user })   end end

and channel

app.user = app.cable.subscriptions.create "userchannel", connected: ->  disconnected: ->  received: (data) -> console.log(data) $("#users").prepend(data.message)

this works correctly. in each browser open uuid connected visible. not use database persistence, first open browser has uuid , rest of browsers goes n-1 uuid visible. it's not important.

my question is:

if browser closes, how can send message delete uuid template?

actioncable not work sessions.

ruby version: 2.4.0 rails version: 5.1.3 jquery installed via yarn

thanks!!!!

you can under 

  def unsubscribed     # cleanup needed when channel unsubscribed   end

in channels/application_cable/your_channel.rb

besides, actioncable does work sessions, takes bit of tweaking though.

if you're serious testing concurrency of actioncable (i.e have serious thoughts using actioncable in upscale production), kind of advise give , plugin anycable. save ton of time.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more