Class: LogsCfPlugin::TailingLogsClient

Inherits:
Object
  • Object
show all
Includes:
MessageWriter
Defined in:
lib/lds-cf-plugin/loggregator/tailling_logs_client.rb

Instance Method Summary collapse

Methods included from MessageWriter

#write

Constructor Details

#initialize(config) ⇒ TailingLogsClient

Returns a new instance of TailingLogsClient.



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# File 'lib/lds-cf-plugin/loggregator/tailling_logs_client.rb', line 9

def initialize(config)
  @config = config
end

Instance Method Details

#logs_for(app, recent) ⇒ Object 



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# File 'lib/lds-cf-plugin/loggregator/tailling_logs_client.rb', line 13

def logs_for(app, recent)
  protocol = use_ssl ? "wss" : "ws"
  websocket_address = "#{protocol}://#{loggregator_host}#{loggregator_port ? ":#{loggregator_port}" : ""}/#{recent ? 'dump' : 'tail'}/?app=#{app.guid}"

  output.puts "websocket_address: #{websocket_address}" if trace

  make_websocket_request(app, websocket_address)
end

#make_websocket_request(app, websocket_address) ⇒ Object 



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# File 'lib/lds-cf-plugin/loggregator/tailling_logs_client.rb', line 22

def make_websocket_request(app, websocket_address)
  redirect_uri = nil
  @em_client_thread = Thread.new do
    EM.run {
      ws = Faye::WebSocket::Client.new(websocket_address, nil, :headers => {"Origin" => "http://localhost", "Authorization" => user_token})
      ws.on :open do |event|
        output.puts("Connected to server.")
        EventMachine.add_periodic_timer(keep_alive_interval) do
          ws.send("I'm alive!")
        end
      end

      ws.on :message do |event|
        begin
          received_message = LogMessage.decode(event.data.pack("C*"))
          write(app, output, received_message)
        rescue Exception => e
          output.puts e.message
          output.puts e.backtrace
          output.puts("Error parsing loggregator data. Please make sure you have the latest lds-cf-plugin.")
          ws.close
        end
      end

      ws.on :error do |event|
        if !redirect_uri
          if event.current_target.status == 302
            redirect_uri = event.current_target.headers["location"]
            ws.close
            @em_client_thread.kill
            ws = nil
          else
            output.puts("Server error: #{websocket_address}")
            output.puts(event.data.inspect) if trace
          end
        end
      end

      ws.on :close do |event|
        unless redirect_uri
          ws.close
          case event.code
            when 4000
              output.puts("Error: No space given.")
            when 4001
              output.puts("Error: No authorization token given.")
            when 4002
              output.puts("Error: Not authorized.")
          end
          output.puts("Server connection closed.")
          @em_client_thread.kill
          ws = nil
        end
      end
    }
  end

  wait_for_em_thread_to_finish

  make_websocket_request(app, redirect_uri) if redirect_uri
end

#wait_for_em_thread_to_finish ⇒ Object 



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# File 'lib/lds-cf-plugin/loggregator/tailling_logs_client.rb', line 84

def wait_for_em_thread_to_finish
  while @em_client_thread.alive? do
    sleep 0.1
  end
end