Class: Cosmos::TimelineMicroservice

Inherits:
Microservice show all
Defined in:
lib/cosmos/microservices/timeline_microservice.rb

Overview

The timeline microservice starts a manager then gets the activities from the sorted set in redis and updates the schedule for the manager. Timeline will then wait for an update on the timeline stream this will trigger an update again to the schedule.

Constant Summary collapse

TIMELINE_METRIC_NAME = 
'timeline_activities_duration_seconds'.freeze

Instance Attribute Summary

Attributes inherited from Microservice

#count, #custom, #error, #microservice_status_thread, #name, #scope, #state

Instance Method Summary collapse

Methods inherited from Microservice

#as_json, run

Constructor Details

#initialize(name) ⇒ TimelineMicroservice

Returns a new instance of TimelineMicroservice.



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 266

def initialize(name)
  super(name)
  @timeline_name = name.split('__')[2]
  @schedule = Schedule.new(@timeline_name)
  @manager = TimelineManager.new(name: @timeline_name, scope: scope, schedule: @schedule)
  @manager_thread = nil
  @read_topic = true
end

Instance Method Details

#block_for_updates ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 310

def block_for_updates
  @read_topic = true
  while @read_topic
    begin
      TimelineTopic.read_topics(@topics) do |_topic, _msg_id, msg_hash, _redis|
        if msg_hash['timeline'] == @timeline_name
          data = JSON.parse(msg_hash['data'])
          public_send(topic_lookup_functions[msg_hash['type']][msg_hash['kind']], data)
        end
      end
    rescue StandardError => e
      Logger.error "#{@timeline_name} failed to read topics #{@topics}\n#{e.formatted}"
    end
  end
end

#create_activity_from_event(data) ⇒ Object

Add the activity to the schedule. We don’t need to hold the job in memory if it is longer than an hour away. A refresh task will update that.



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 337

def create_activity_from_event(data)
  diff = data['start'] - Time.now.to_i
  return unless (2..3600).include? diff

  activity = ActivityModel.from_json(data, name: @timeline_name, scope: @scope)
  @schedule.add_activity(activity)
end

#remove_activity_from_event(data) ⇒ Object

Remove the activity from the schedule. We don’t need to remove the activity if it is longer than an hour away. It will be removed from the data.



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 347

def remove_activity_from_event(data)
  diff = data['start'] - Time.now.to_i
  return unless (2..3600).include? diff

  activity = ActivityModel.from_json(data, name: @timeline_name, scope: @scope)
  @schedule.remove_activity(activity)
end

#run ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 275

def run
  Logger.info "#{@name} timeine running"
  @manager_thread = Thread.new { @manager.run }
  loop do
    start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    current_activities = ActivityModel.activities(name: @timeline_name, scope: @scope)
    @schedule.update(current_activities)
    diff = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start # seconds as a float
    metric_labels = { 'timeline' => @timeline_name, 'thread' => 'microservice' }
    @metric.add_sample(name: TIMELINE_METRIC_NAME, value: diff, labels: metric_labels)
    break if @cancel_thread

    block_for_updates()
    break if @cancel_thread
  end
  Logger.info "#{@name} timeine exitting"
end

#schedule_refresh(data) ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 330

def schedule_refresh(data)
  Logger.debug "#{@name} timeline web socket schedule refresh: #{data}"
  @read_topic = false
end

#shutdown ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 355

def shutdown
  @read_topic = false
  @manager.shutdown
  super
end

#timeline_nop(data) ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 326

def timeline_nop(data)
  Logger.debug "#{@name} timeline web socket event: #{data}"
end

#topic_lookup_functions ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 293

def topic_lookup_functions
  {
    'timeline' => {
      'created' => :timeline_nop,
      'refresh' => :schedule_refresh,
      'updated' => :timeline_nop,
      'deleted' => :timeline_nop
    },
    'activity' => {
      'event' => :timeline_nop,
      'created' => :create_activity_from_event,
      'updated' => :schedule_refresh,
      'deleted' => :remove_activity_from_event
    }
  }
end