websocket optimization

ruby/lib/jam_ruby/base_manager.rb

@@ -27,20 +27,21 @@ module JamRuby
         # create a transaction, and pass the current connection to ConnectionManager.
         # this lets the entire operation work with the same transaction,
         # across Rails ActiveRecord and the pg-gem based code in ConnectionManager.
-        manager.pg_conn = connection.instance_variable_get("@connection")
+        conn = connection.instance_variable_get("@connection")
+        manager.pg_conn = conn
 
         if @@in_websocket_gateway
           # it only necessary to catch exceptions in websocket-gateway, which has only one AR connection and does not clean it up like a Rails context does
           begin
             connection.transaction do
-              yield manager
+              yield manager, conn
             end
           rescue Exception => e
             ActiveRecord::Base.connection.execute('ROLLBACK')
           end
         else
           connection.transaction do
-            yield manager
+            yield manager, conn
           end
         end
       end

ruby/lib/jam_ruby/connection_manager.rb

@@ -138,8 +138,7 @@ SQL
 
     # flag  connections as stale
     def flag_stale_connections(gateway_name)
-      ConnectionManager.active_record_transaction do |connection_manager|
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
         sql = "UPDATE connections SET aasm_state = '#{Connection::STALE_STATE.to_s}' WHERE updated_at < (NOW() - (interval '1 second' * stale_time)) AND aasm_state = '#{Connection::CONNECT_STATE.to_s}' AND gateway = '#{gateway_name}'"
         conn.exec(sql)
       end
@@ -151,11 +150,23 @@ SQL
       self.stale_connection_client_ids(gateway_name).each { |client| self.delete_connection(client[:client_id]) }
     end
 
+    def connection_client_ids_for_gateway(gateway_name)
+      clients = []
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
+        sql = "SELECT client_id FROM connections WHERE gateway = '#{gateway_name}'"
+        conn.exec(sql) do |result|
+          result.each { |row|
+            client_id = row['client_id']
+            clients << client_id
+          }
+        end
+      end
+      clients
+    end
     # expiring connections in stale state, which deletes them
     def stale_connection_client_ids(gateway_name)
       clients = []
-      ConnectionManager.active_record_transaction do |connection_manager|
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
         sql = "SELECT client_id, music_session_id, user_id, client_type FROM connections WHERE updated_at < (NOW() - (interval '1 second' * expire_time)) AND gateway = '#{gateway_name}'"
         conn.exec(sql) do |result|
           result.each { |row|
@@ -181,8 +192,7 @@ SQL
       raise "invalid client_type: #{client_type}" if client_type != 'client' && client_type != 'browser'
 
       count = 0
-      ConnectionManager.active_record_transaction do |connection_manager|
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
 
         # turn ip_address string into a number, then fetch the isp and block records
 
@@ -242,8 +252,7 @@ SQL
     # and this connection was in a session
     def delete_connection(client_id, &blk)
 
-      ConnectionManager.active_record_transaction do |connection_manager|
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
         count = 0
         user_id = nil
         music_session_id = nil
@@ -426,8 +435,7 @@ SQL
       connection = nil
 
       tracks_changed = false
-      ConnectionManager.active_record_transaction do |connection_manager|
-        db_conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, db_conn|
 
         connection = Connection.find_by_client_id(client_id)
 
@@ -469,9 +477,7 @@ SQL
     # within the connection table lock
     def leave_music_session(user, connection, music_session, &blk)
       send_tracks_changed = false
-      ConnectionManager.active_record_transaction do |connection_manager|
-
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
 
         lock_connections(conn)
 

ruby/lib/jam_ruby/models/music_session.rb

@@ -651,7 +651,7 @@ module JamRuby
       ms.description        = options[:description]
       ms.genre_id           = (options[:genres].length > 0 ? options[:genres][0] : nil) if options[:genres]
       ms.musician_access    = options[:musician_access]
-      ms.friends_can_join   = options[:friends_can_join]
+      ms.friends_can_join   = options[:friends_can_join] || false
       ms.approval_required  = options[:approval_required]
       ms.fan_access         = options[:fan_access]
       ms.fan_chat           = options[:fan_chat]

web/app/assets/javascripts/react-components/stores/SessionStore.js.coffee

@@ -694,8 +694,8 @@ ConfigureTracksActions = @ConfigureTracksActions
           )
         )
       )
-      .fail(() =>
-        logger.error("unable to fetch session history")
+      .fail((e) =>
+        logger.error("unable to fetch session history", e)
       )
 
     waitForSessionPageEnterDone: () ->

websocket-gateway/lib/jam_websockets/client_context.rb

@@ -1,7 +1,7 @@
   module JamWebsockets
   class ClientContext
     
-    attr_accessor :user, :client, :msg_count, :session, :client_type, :sent_bad_state_previously, :active
+    attr_accessor :user, :client, :msg_count, :session, :client_type, :sent_bad_state_previously, :active, :updated_at
 
     def initialize(user, client, client_type)
       @user = user
@@ -12,9 +12,14 @@
       @session = nil
       @sent_bad_state_previously = false
       @active = true
+      @updated_at = Time.now
       client.context = self
     end
 
+    def stale?(stale_time)
+      return Time.now - @updated_at > stale_time
+    end
+
     def to_s
       return "Client[user:#{@user} client:#{@client.client_id} msgs:#{@msg_count} session:#{@session} client_type:#{@client_type} channel_id: #{@client.channel_id}]"
     end

websocket-gateway/lib/jam_websockets/router.rb

@@ -82,6 +82,40 @@ module JamWebsockets
       @largest_message_user = nil
       @highest_drift = 0
 
+      @pending_notification_seen_ats = {}
+      @semaphore_pnsa = Mutex.new
+
+      @pending_deletions = {}
+      @semaphore_deletions = Mutex.new
+
+    end
+
+    def init
+      wipe_all_connections
+
+      # this thread runs forever while WSG runs, and should do anything easily gotten out of critical message handling path
+      @background_thread = Thread.new {
+        count = 0
+
+        while true
+
+          begin
+            periodical_check_connections
+            periodical_notification_seen
+
+            if count == 30
+              periodical_check_clients
+              count = 0
+            end
+            count = count + 1
+
+          rescue => e
+            @log.error "unhandled error in thread #{e}"
+            @log.error "stacktrace #{e.backtrace}"
+          end
+          sleep 1
+        end
+      }
     end
 
     def start(connect_time_stale_client, connect_time_expire_client, connect_time_stale_browser, connect_time_expire_browser, options={:host => "localhost", :port => 5672, :max_connections_per_user => 10, :gateway => 'default', :allow_dynamic_registration => true, :chat_enabled => true, :chat_blast => true}, &block)
@@ -466,7 +500,8 @@ module JamWebsockets
       client.onclose {
         time_it('onclose') {
           @log.debug "connection closed. marking stale: #{client.context}"
-          cleanup_client(client)
+          #cleanup_client(client)
+          cleanup_client_with_id(client.client_id)
         }
       }
 
@@ -538,19 +573,19 @@ module JamWebsockets
     end
 
     # caused a client connection to be marked stale
-    def stale_client(client)
-      if client.client_id
-        @log.info "marking client stale: #{client.context}"
-        ConnectionManager.active_record_transaction do |connection_manager|
-          music_session_id = connection_manager.flag_connection_stale_with_client_id(client.client_id)
-          # update the session members, letting them know this client went stale
-          context = @client_lookup[client.client_id]
-          if music_session = ActiveMusicSession.find_by_id(music_session_id)
-            Notification.send_musician_session_stale(music_session, client.client_id, context.user)
-          end unless music_session_id.nil?
-        end
-      end
-    end
+    # def stale_client(client)
+    #   if client.client_id
+    #     @log.info "marking client stale: #{client.context}"
+    #     ConnectionManager.active_record_transaction do |connection_manager|
+    #       music_session_id = connection_manager.flag_connection_stale_with_client_id(client.client_id)
+    #       # update the session members, letting them know this client went stale
+    #       context = @client_lookup[client.client_id]
+    #       if music_session = ActiveMusicSession.find_by_id(music_session_id)
+    #         Notification.send_musician_session_stale(music_session, client.client_id, context.user)
+    #       end unless music_session_id.nil?
+    #     end
+    #   end
+    # end
 
     def route(client_msg, client)
       message_type = @message_factory.get_message_type(client_msg)
@@ -794,7 +829,6 @@ module JamWebsockets
       end
 
 
-
       # we have to deal with jamblaster before login
       if jamblaster_serial_no && jamblaster_serial_no != ''
         jamblaster = Jamblaster.bootstrap(jamblaster_serial_no)
@@ -1117,16 +1151,24 @@ module JamWebsockets
           #profile_it('heartbeat_transaction') {
           #Connection.transaction do
           # send back track_changes_counter if in a session
-          profile_it('heartbeat_session') {
-            if connection.music_session_id
-              music_session = ActiveMusicSession.select(:track_changes_counter).find_by_id(connection.music_session_id)
-              track_changes_counter = music_session.track_changes_counter if music_session
-            end
-          }
+
+          #dboptz
+
+          #profile_it('heartbeat_session') {
+          #  if connection.music_session_id
+          #    music_session = ActiveMusicSession.select(:track_changes_counter).find_by_id(connection.music_session_id)
+          #    track_changes_counter = music_session.track_changes_counter if music_session
+          #  end
+          #}
+
+          #stale = context.stale?(@connect_time_stale_client)
 
           profile_it('heartbeat_touch') {
             # update connection updated_at and if the user is active
-            Connection.where(id: connection.id).update_all(user_active: heartbeat.active, updated_at: Time.now)
+            # dboptz
+            #Connection.where(id: connection.id).update_all(user_active: heartbeat.active, updated_at: Time.now)
+            context.updated_at = Time.now
+            context.active = heartbeat.active
           }
 
           profile_it('heartbeat_notification') {
@@ -1139,12 +1181,12 @@ module JamWebsockets
           #}
 
           profile_it('heartbeat_stale') {
-            if connection.stale?
-              ConnectionManager.active_record_transaction do |connection_manager|
-                heartbeat_interval, connection_stale_time, connection_expire_time = determine_connection_times(context.user, context.client_type)
-                connection_manager.reconnect(connection, client.channel_id, connection.music_session_id, nil, connection_stale_time, connection_expire_time, nil, @gateway_name)
-              end
-            end
+            #if stale
+            #  ConnectionManager.active_record_transaction do |connection_manager|
+            #    heartbeat_interval, connection_stale_time, connection_expire_time = determine_connection_times(context.user, context.client_type)
+            #    connection_manager.reconnect(connection, client.channel_id, connection.music_session_id, nil, connection_stale_time, connection_expire_time, nil, @gateway_name)
+            #  end
+            #end
           }
         end
 
@@ -1170,11 +1212,9 @@ module JamWebsockets
       notification_id_field = heartbeat.notification_seen if heartbeat.value_for_tag(1)
       if notification_id_field && notification_id_field != ''
         notification = Notification.find_by_id(notification_id_field)
+        @semaphore_pnsa.synchronize do
           if notification
-          connection.user.notification_seen_at = notification.created_at
-          unless connection.user.save(validate: false)
-            @log.error "unable to update notification_seen_at via id field for client #{context}.  errors: #{connection.user.errors.inspect}"
-          end
+            @pending_notification_seen_ats[connection.user.id] = notification.created_at
           else
             notification_seen_at_parsed = nil
             notification_seen_at = heartbeat.notification_seen_at if heartbeat.value_for_tag(2)
@@ -1185,9 +1225,7 @@ module JamWebsockets
             end
 
             if notification_seen_at_parsed
-            connection.user.notification_seen_at = notification_seen_at
-            unless connection.user.save(validate: false)
-              @log.error "unable to update notification_seen_at via time field for client #{context}.  errors: #{connection.user.errors.inspect}"
+              @pending_notification_seen_ats[connection.user.id] = notification_seen_at
             end
           end
         end
@@ -1361,9 +1399,11 @@ module JamWebsockets
 
     def periodical_flag_connections
       # @log.debug("*** flag_stale_connections:  fires each #{flag_max_time} seconds")
-      ConnectionManager.active_record_transaction do |connection_manager|
-        connection_manager.flag_stale_connections(@gateway_name)
-      end
+      #pgoptz
+      #ConnectionManager.active_record_transaction do |connection_manager|
+      #  connection_manager.flag_stale_connections(@gateway_name)
+      #end
+
     end
 
     def periodical_check_clients
@@ -1396,14 +1436,14 @@ module JamWebsockets
       sql = "WITH app_client_ids(client_id) AS (VALUES#{client_ids})
               SELECT client_id from app_client_ids WHERE client_id NOT IN (SELECT client_id FROM connections WHERE gateway = '#{@gateway_name}');
  "
-      ConnectionManager.active_record_transaction do |connection_manager|
-        conn = connection_manager.pg_conn
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
         conn.exec(sql) do |result|
           result.each { |row|
             client_id = row['client_id']
             context = @client_lookup[client_id]
             if context
               @log.debug("cleaning up missing client #{client_id}, #{context.user}")
+              #cleanup_client_with_id(client_id)
               cleanup_client(context.client)
             else
               @log.error("could not clean up missing client #{client_id}")
@@ -1413,6 +1453,39 @@ module JamWebsockets
       end
     end
 
+    def wipe_all_connections
+      # meant to be called only on startup; delete all connections fo myself
+      ConnectionManager.active_record_transaction do |connection_manager|
+        clients = connection_manager.connection_client_ids_for_gateway(@gateway_name)
+        clients.each do |client_id|
+          cleanup_client_with_id(client_id)
+        end
+      end
+    end
+
+    def periodical_notification_seen
+      pending = nil
+      @semaphore_pnsa.synchronize do
+        return if @pending_notification_seen_ats.count == 0
+        pending = @pending_notification_seen_ats.clone
+        @pending_notification_seen_ats.clear
+      end
+
+      bulk_values = pending.map{|k,v| "('#{k}', '#{v}'::timestamp)"}.join(',')
+      sql = %{
+      update users as u
+        set notification_seen_at = c.notification_seen_at
+      from (values
+        #{bulk_values}
+      ) as c(user_id, notification_seen_at)
+        where c.user_id = u.id;
+      }
+      @log.info("SQL #{sql}")
+      ConnectionManager.active_record_transaction do |connection_manager, conn|
+        conn.exec(sql)
+      end
+    end
+
     def periodical_check_connections
       # this method is designed to be called periodically (every few seconds)
       # in which this gateway instance will check only its own clients for their health
@@ -1426,10 +1499,19 @@ module JamWebsockets
       # to make sure that we have stale connections cleaned up, even in the case of gateways that have crashed or are buggy
 
       clients = []
-      ConnectionManager.active_record_transaction do |connection_manager|
-        clients = connection_manager.stale_connection_client_ids(@gateway_name)
+      # dboptz
+      #ConnectionManager.active_record_transaction do |connection_manager|
+      # clients = connection_manager.stale_connection_client_ids(@gateway_name)
+      #
+      #end
+
+      puts "periodical_check_connections"
+      @client_lookup.each do |client_id, client_context|
+        if Time.now - client_context.updated_at > @connect_time_expire_client
+          cleanup_client_with_id(client_id)
         end
-      cleanup_clients_with_ids(clients)
+      end
+
     end
 
     def periodical_stats_dump
@@ -1438,6 +1520,10 @@ module JamWebsockets
       stats = @message_stats.sort_by { |k, v| -v }
       stats.map { |i| i[1] = (i[1] / 60.0).round(2) }
 
+      @semaphore.synchronize do
+        @log.info("num clients: #{@client_lookup.count}")
+      end
+
       @log.info("msg/s: " + stats.map { |i| i.join('=>') }.join(', '))
       @log.info("largest msg from #{@largest_message_user}: #{@largest_message ? @largest_message.length : 0}b")
 
@@ -1485,7 +1571,7 @@ module JamWebsockets
       @message_stats['total_time'] = total_time
       @message_stats['banned_users'] = @temp_ban.length
 
-      Stats.write('gateway.stats', @message_stats)
+      #Stats.write('gateway.stats', @message_stats)
 
       # clear out stats
       @message_stats.clear
@@ -1501,9 +1587,7 @@ module JamWebsockets
       @heartbeat_tracker = {}
     end
 
-    def cleanup_clients_with_ids(expired_connections)
-      expired_connections.each do |expired_connection|
-        cid = expired_connection[:client_id]
+    def cleanup_client_with_id(cid)
 
       client_context = @client_lookup[cid]
 
@@ -1527,11 +1611,10 @@ module JamWebsockets
           user = User.find_by_id(user_id) unless user_id.nil?
 
           if music_session
-
             msuh = MusicSessionUserHistory.where(client_id: cid).order('created_at DESC').first
             if msuh
               msuh.session_removed_at = Time.now if msuh.session_removed_at.nil?
-                msuh.save(validate:false)
+              msuh.save(validate: false)
             end
 
 
@@ -1570,10 +1653,11 @@ module JamWebsockets
         @log.info("cleanup_client:  Sent session depart")
       end
     end
-    end
 
     # removes all resources associated with a client
     def cleanup_client(client)
+      @semaphore.synchronize do
+
         client.close
 
         # unregister any subscriptions
@@ -1581,7 +1665,6 @@ module JamWebsockets
           unregister_subscription(client, subscription[:type], subscription[:id])
         end
 
-      @semaphore.synchronize do
         pending = client.context.nil? # presence of context implies this connection has been logged into
 
         if pending

websocket-gateway/lib/jam_websockets/server.rb

@@ -38,17 +38,22 @@ module JamWebsockets
 
       @log.info "starting server #{host}:#{port} staleness_time=#{connect_time_stale_client}; reconnect time = #{connect_time_expire_client}, rabbitmq=#{rabbitmq_host}:#{rabbitmq_port} gateway_name=#{gateway_name}"
 
+      @router.init
+
       EventMachine.error_handler{|e|
         puts "unhandled error #{e}"
+        puts "unhandled error #{e.backtrace}"
         @log.error "unhandled error #{e}"
+        @log.error "unhandled error #{e.backtrace}"
         #Bugsnag.notify(e)
       }
 
       EventMachine.run do
         @router.start(connect_time_stale_client, connect_time_expire_client, connect_time_stale_browser, connect_time_expire_browser, host: rabbitmq_host, port: rabbitmq_port, max_connections_per_user: max_connections_per_user, gateway: gateway_name, allow_dynamic_registration: allow_dynamic_registration, chat_enabled: chat_enabled, chat_blast: chat_blast) do
-          start_connection_expiration
-          start_client_expiration
-          start_connection_flagger
+
+          #start_connection_expiration
+          #start_client_expiration
+          #start_connection_flagger
           start_stats_dump
           start_websocket_listener(host, port, trust_port, trust_check, options[:emwebsocket_debug])
           calling_thread.wakeup if calling_thread
@@ -100,7 +105,8 @@ module JamWebsockets
 
     def start_connection_expiration
       # one cleanup on startup
-      @router.periodical_check_connections
+      @router.wipe_all_connections
+      #@router.periodical_check_connections
 
       @last_conn_check = Time.now
       timer = 2
@@ -129,7 +135,7 @@ module JamWebsockets
     end
 
     def start_stats_dump
-      EventMachine::PeriodicTimer.new(60) do
+      EventMachine::PeriodicTimer.new(6) do
         time_it('stats_dump') { safety_net { @router.periodical_stats_dump } }
       end
     end

websocket-gateway/spec/factories.rb

@@ -171,4 +171,16 @@ FactoryGirl.define do
     association       :jam_track, factory: :jam_track
     association       :user,      factory: :user
   end
+
+  factory :notification, :class => JamRuby::Notification do
+
+    factory :notification_text_message do
+      description 'TEXT_MESSAGE'
+      message "chocolate"
+    end
+  end
+
+  factory :friendship, :class => JamRuby::Friendship do
+
+  end
 end

websocket-gateway/spec/jam_websockets/stress_spec.rb

@@ -0,0 +1,304 @@
+require 'spec_helper'
+require 'thread'
+
+def time_it(cat, &blk)
+  start = Time.now
+
+  blk.call
+
+  time = Time.now - start
+
+  puts("TIME: #{cat}: #{time}")
+end
+def safety_net(&blk)
+  begin
+    blk.call
+  rescue => e
+    #Bugsnag.notify(e)
+    @log.error("unhandled exception in EM Timer #{e}")
+    puts "Error during processing: #{$!}"
+    puts "Backtrace:\n\t#{e.backtrace.join("\n\t")}"
+
+  end
+end
+
+LoginClient = Class.new do
+  attr_accessor :onmsgblock, :onopenblock, :oncloseblock, :onerrorblock, :encode_json, :channel_id, :client_id, :user_id, :context, :trusted, :subscriptions
+
+
+  def initialize(user)
+    @subscriptions = Set.new
+    @channel_id = user.id
+    @encode_json = true
+  end
+
+  def connected?
+    true
+  end
+
+  def onopen(&block)
+    @onopenblock = Proc.new { |handshake| block }
+  end
+
+  def onmessage(&block)
+    @onmsgblock= Proc.new { |data| block.call data }
+  end
+
+  def onclose(&block)
+    @oncloseblock = Proc.new { || block.call }
+  end
+
+  def onerror(&block)
+    @onerrorblock = Proc.new { |err| block.call err }
+  end
+
+  def close()
+
+  end
+
+  def send(msg)
+    puts msg
+  end
+
+  def get_peername
+    return "\x00\x02\x93\v\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00" # 37643, "localhost"
+  end
+
+end
+
+class TestClient
+
+  def initialize(user, router)
+    @user = user
+    @client =  LoginClient.new(@user)
+    @router = router
+  end
+
+  def connect
+    @router.new_client(@client, false)
+  end
+
+  def login
+    login_message = login_options(@user)
+    @router.handle_login(@client, login_message)
+  end
+
+  def heartbeat(notification_id = nil, notification_seen_at = nil)
+    heartbeat = Jampb::Heartbeat.new
+    if notification_id
+      heartbeat.notification_seen = notification_id
+    else
+      heartbeat.notification_seen = 'junk'
+    end
+
+    if notification_seen_at
+      heartbeat.notification_seen_at = notification_seen_at.to_s
+    end
+
+    @router.handle_heartbeat(heartbeat, '1', @client)
+  end
+
+  def disconnect
+    @client.oncloseblock.call
+  end
+
+  private
+  def login_options(user)
+    options = {}
+    options["token"] = user.remember_token
+    options["client_id"] = user.id
+    options["client_type"] = "client"
+    options["client_id_int"] = 1
+    options
+  end
+
+end
+
+describe Router, :spec_timeout => 15 do
+
+  def database_env (env)
+    singleton = GenericState.new
+    singleton.id = 'default'
+    singleton.env = env
+    singleton.save!
+  end
+
+  def rails_env (env)
+    JamRuby::Environment.should_receive(:mode).any_number_of_times.and_return(env)
+  end
+
+
+  include EventedSpec::EMSpec
+  default_timeout(1000000)
+
+  em_before do
+    puts "EM BEFORE ROUTER NEW"
+
+  end
+
+  subject { @router }
+
+  em_after do
+    puts "EM AFTER"
+  end
+
+  def sequence_1(user, special_heartbeat)
+
+    client1 = TestClient.new(user, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 1
+    client1.heartbeat
+    update_notification_at = Time.now.utc
+    #client1.heartbeat(special_heartbeat.id.to_s, nil)
+    client1.heartbeat(nil, update_notification_at)
+
+    client1.disconnect
+
+    sleep 6
+
+    user.reload
+    user = User.find(user.id)
+    @router.client_lookup.count.should be 0
+    last_notification_seen_at = user.notification_seen_at
+    last_notification_seen_at.should_not be_nil
+    last_notification_seen_at.to_i.should be update_notification_at.to_i
+  end
+
+  def sequence_2(user)
+
+    before_count = Connection.count
+    client1 = TestClient.new(user, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 1
+    after_count = Connection.count
+    before_count.should be (after_count - 1)
+
+    sleep 25
+
+    @router.client_lookup.count.should be 0
+    disc_count = Connection.count
+    before_count.should be disc_count
+  end
+
+  def sequence_in_session(user)
+    before_count = Connection.count
+    client1 = TestClient.new(user, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 1
+
+    music_session = FactoryGirl.create(:active_music_session, :creator => user)
+    connection = Connection.find_by_user_id(user.id)
+    connection.music_session = music_session
+    connection.save!
+
+
+    client1.disconnect
+    @router.client_lookup.count.should be 0
+    disc_count = Connection.count
+    before_count.should be disc_count
+  end
+  def sequence_in_two_session(user1, user2)
+
+    # create friendship between the two, to increase notifications
+    FactoryGirl.create(:friendship, :user => user1, :friend => user2)
+    FactoryGirl.create(:friendship, :user => user2, :friend => user1)
+
+    before_count = Connection.count
+    client1 = TestClient.new(user1, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 1
+
+    client1 = TestClient.new(user2, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 2
+
+    music_session = FactoryGirl.create(:active_music_session, :creator => user)
+    connection = Connection.find_by_user_id(user1.id)
+    connection.music_session = music_session
+    connection.save!
+
+    connection2 = Connection.find_by_user_id(user2.id)
+    connection2.music_session = music_session
+    connection2.save!
+
+
+    client1.disconnect
+    @router.client_lookup.count.should be 1
+    disc_count = Connection.count
+    before_count.should be (disc_count - 1)
+  end
+
+    def delete_conn_from_under(user)
+
+    before_count = Connection.count
+    client1 = TestClient.new(user, @router)
+    client1.connect
+    client1.login
+    @router.client_lookup.count.should be 1
+    after_count = Connection.count
+    before_count.should be (after_count - 1)
+
+    Connection.first.delete
+
+    @router.periodical_check_clients
+
+    @router.client_lookup.count.should be 0
+    disc_count = Connection.count
+    before_count.should be disc_count
+  end
+
+
+  describe "stress"  do
+    before {
+      database_env('production')
+      rails_env('production')
+      stub_const("ENV", {'BUILD_NUMBER' => 1})
+    }
+    let(:user1) { FactoryGirl.create(:user) }
+    let(:user2) { FactoryGirl.create(:user) }
+    let(:user3) { FactoryGirl.create(:user) }
+    let(:user4) { FactoryGirl.create(:user) }
+    let(:user5) { FactoryGirl.create(:user) }
+    let!(:other) { FactoryGirl.create(:user, last_jam_locidispid: 1) }
+    let!(:msg1) {FactoryGirl.create(:notification_text_message, source_user: other, target_user: user1) }
+
+    it "the test" do
+
+        @router = Router.new()
+        @router.connect_time_expire_client = 20
+        @router.connect_time_stale_client = 14
+        @router.heartbeat_interval_client = @router.connect_time_stale_client / 2
+        @router.connect_time_expire_browser = 20
+        @router.connect_time_stale_browser = 14
+        @router.max_connections_per_user = 10
+        @router.heartbeat_interval_browser = @router.connect_time_stale_browser / 2
+        @router.maximum_minutely_heartbeat_rate_browser = 10
+        @router.maximum_minutely_heartbeat_rate_client = 10
+        @router.amqp_connection_manager = AmqpConnectionManager.new(true, 4, host: 'localhost', port: 5672)
+        @router.gateway_name = 'gateway1'
+
+        @router.init
+
+        em do
+          EventMachine::PeriodicTimer.new(5) do
+            time_it('stats_dump') { safety_net { @router.periodical_stats_dump } }
+          end
+
+          sequence_in_session(user3)
+          sequence_in_two_session(user4, user5)
+          delete_conn_from_under(user3)
+          sequence_1(user1, msg1)
+          sequence_1(user1, msg1)
+          sequence_2(user2)
+
+          done
+
+        end
+    end
+  end
+end