Class: Cosmos::ActivityModel

Inherits:
Model show all
Defined in:
lib/cosmos/models/activity_model.rb

Constant Summary collapse

MAX_DURATION = 
Time::SEC_PER_DAY
PRIMARY_KEY =

MUST be equal to ‘TimelineModel::PRIMARY_KEY` minus the leading __

'__cosmos_timelines'.freeze

Instance Attribute Summary collapse

Attributes inherited from Model

#name, #plugin, #scope, #updated_at

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Model

#as_config, #deploy, filter, find_all_by_plugin, get_all_models, get_model, handle_config, names, set, #undeploy

Constructor Details

#initialize(name:, start:, stop:, kind:, data:, scope:, updated_at: 0, duration: 0, fulfillment: nil, events: nil) ⇒ ActivityModel

Returns a new instance of ActivityModel.



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# File 'lib/cosmos/models/activity_model.rb', line 114

def initialize(
  name:,
  start:,
  stop:,
  kind:,
  data:,
  scope:,
  updated_at: 0,
  duration: 0,
  fulfillment: nil,
  events: nil
)
  super("#{scope}#{PRIMARY_KEY}__#{name}", name: name, scope: scope)
  set_input(
    fulfillment: fulfillment,
    start: start,
    stop: stop,
    kind: kind,
    data: data,
    events: events,
  )
  @updated_at = updated_at
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def data
  @data
end

#duration ⇒ Object (readonly)

Returns the value of attribute duration.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def duration
  @duration
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def events
  @events
end

#fulfillment ⇒ Object (readonly)

Returns the value of attribute fulfillment.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def fulfillment
  @fulfillment
end

#kind ⇒ Object (readonly)

Returns the value of attribute kind.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def kind
  @kind
end

#start ⇒ Object (readonly)

Returns the value of attribute start.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def start
  @start
end

#stop ⇒ Object (readonly)

Returns the value of attribute stop.



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# File 'lib/cosmos/models/activity_model.rb', line 112

def stop
  @stop
end

Class Method Details

.activities(name:, scope:) ⇒ Array|nil

Called via the microservice this gets the previous 00:00:15 to 01:01:00. This should allow for a small buffer around the timeline to make sure the schedule doesn’t get stale. 00:00:15 was selected as the schedule queue used in the microservice has round robin array with 15 slots to make sure we don’t miss a planned task.

Returns:

  • (Array|nil) —

    Array of the next hour in the sorted set



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# File 'lib/cosmos/models/activity_model.rb', line 41

def self.activities(name:, scope:)
  now = Time.now.to_i
  start_score = now - 15
  stop_score = (now + 3660)
  array = Store.zrangebyscore("#{scope}#{PRIMARY_KEY}__#{name}", start_score, stop_score)
  ret_array = Array.new
  array.each do |value|
    ret_array << ActivityModel.from_json(value, name: name, scope: scope)
  end
  return ret_array
end

.all(name:, scope:, limit: 100) ⇒ Array<Hash>

Returns Array up to the limit of the models (as Hash objects) stored under the primary key.

Returns:

  • (Array<Hash>) —

    Array up to the limit of the models (as Hash objects) stored under the primary key



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# File 'lib/cosmos/models/activity_model.rb', line 68

def self.all(name:, scope:, limit: 100)
  array = Store.zrange("#{scope}#{PRIMARY_KEY}__#{name}", 0, -1, :limit => [0, limit])
  ret_array = Array.new
  array.each do |value|
    ret_array << JSON.parse(value)
  end
  return ret_array
end

.count(name:, scope:) ⇒ Integer

Returns count of the members stored under the primary key.

Returns:

  • (Integer) —

    count of the members stored under the primary key



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# File 'lib/cosmos/models/activity_model.rb', line 87

def self.count(name:, scope:)
  return Store.zcard("#{scope}#{PRIMARY_KEY}__#{name}")
end

.destroy(name:, scope:, score:) ⇒ Integer

Remove one member from a sorted set.

Returns:

  • (Integer) —

    count of the members removed



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# File 'lib/cosmos/models/activity_model.rb', line 93

def self.destroy(name:, scope:, score:)
  Store.zremrangebyscore("#{scope}#{PRIMARY_KEY}__#{name}", score, score)
end

.from_json(json, name:, scope:) ⇒ ActivityModel

Returns Model generated from the passed JSON.

Returns:



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# File 'lib/cosmos/models/activity_model.rb', line 104

def self.from_json(json, name:, scope:)
  json = JSON.parse(json) if String === json
  raise "json data is nil" if json.nil?

  json.transform_keys!(&:to_sym)
  self.new(**json, name: name, scope: scope)
end

.get(name:, start:, stop:, scope:, limit: 100) ⇒ Array|nil

Returns Array up to 100 of this model or empty array if name not found under primary_key.

Returns:

  • (Array|nil) —

    Array up to 100 of this model or empty array if name not found under primary_key



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# File 'lib/cosmos/models/activity_model.rb', line 54

def self.get(name:, start:, stop:, scope:, limit: 100)
  if start > stop
    raise ActivityInputError.new "start: #{start} must be before stop: #{stop}"
  end

  array = Store.zrangebyscore("#{scope}#{PRIMARY_KEY}__#{name}", start, stop, :limit => [0, limit])
  ret_array = Array.new
  array.each do |value|
    ret_array << JSON.parse(value)
  end
  return ret_array
end

.range_destroy(name:, scope:, min:, max:) ⇒ Integer

Remove members from min to max of the sorted set.

Returns:

  • (Integer) —

    count of the members removed



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# File 'lib/cosmos/models/activity_model.rb', line 99

def self.range_destroy(name:, scope:, min:, max:)
  Store.zremrangebyscore("#{scope}#{PRIMARY_KEY}__#{name}", min, max)
end

.score(name:, score:, scope:) ⇒ String|nil

Returns String of the saved json or nil if score not found under primary_key.

Returns:

  • (String|nil) —

    String of the saved json or nil if score not found under primary_key



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# File 'lib/cosmos/models/activity_model.rb', line 78

def self.score(name:, score:, scope:)
  array = Store.zrangebyscore("#{scope}#{PRIMARY_KEY}__#{name}", score, score, :limit => [0, 1])
  array.each do |value|
    return ActivityModel.from_json(value, name: name, scope: scope)
  end
  return nil
end

Instance Method Details

#add_event(status:) ⇒ Object

add_event will make an event. This will NOT save the object to the redis database

Parameters:

  • status (String) —

    • the event status such as "queued" or "updated" or "created"



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# File 'lib/cosmos/models/activity_model.rb', line 274

def add_event(status:)
  event = {
    'time' => Time.now.to_i,
    'event' => status
  }
  @events << event
end

#as_json ⇒ Hash

Returns generated from the ActivityModel.

Returns:

  • (Hash) —

    generated from the ActivityModel



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# File 'lib/cosmos/models/activity_model.rb', line 305

def as_json
  {
    'name' => @name,
    'updated_at' => @updated_at,
    'fulfillment' => @fulfillment,
    'duration' => @duration,
    'start' => @start,
    'stop' => @stop,
    'kind' => @kind,
    'events' => @events,
    'data' => @data
  }
end

#commit(status:, message: nil, fulfillment: nil) ⇒ Object

commit will make an event and save the object to the redis database

Parameters:

  • status (String) —

    • the event status such as "complete" or "failed"

  • message (String) (defaults to: nil) —

    • an optional message to include in the event



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# File 'lib/cosmos/models/activity_model.rb', line 256

def commit(status:, message: nil, fulfillment: nil)
  event = {
    'time' => Time.now.to_i,
    'event' => status,
    'commit' => true
  }
  event['message'] = message unless message.nil?
  @fulfillment = fulfillment.nil? ? @fulfillment : fulfillment
  @events << event
  Store.multi do |multi|
    multi.zremrangebyscore(@primary_key, @start, @start)
    multi.zadd(@primary_key, @start, JSON.generate(self.as_json))
  end
  notify(kind: 'event')
end

#create ⇒ Object

Update the Redis hash at primary_key and set the score equal to the start Epoch time the member is set to the JSON generated via calling as_json



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# File 'lib/cosmos/models/activity_model.rb', line 212

def create
  validate_input(start: @start, stop: @stop, kind: @kind, data: @data)
  collision = validate_time()
  unless collision.nil?
    raise ActivityOverlapError.new "no activities can overlap, collision: #{collision}"
  end

  @updated_at = Time.now.to_nsec_from_epoch
  add_event(status: 'created')
  Store.zadd(@primary_key, @start, JSON.generate(self.as_json))
  notify(kind: 'created')
end

#destroy ⇒ Object

destroy the activity from the redis database



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# File 'lib/cosmos/models/activity_model.rb', line 283

def destroy
  Store.zremrangebyscore(@primary_key, @start, @start)
  notify(kind: 'deleted')
end

#notify(kind:, extra: nil) ⇒ Object

Returns [] update the redis stream / timeline topic that something has changed.

Returns:

  • update the redis stream / timeline topic that something has changed



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# File 'lib/cosmos/models/activity_model.rb', line 289

def notify(kind:, extra: nil)
  notification = {
    'data' => JSON.generate(as_json()),
    'kind' => kind,
    'type' => 'activity',
    'timeline' => @name
  }
  notification['extra'] = extra unless extra.nil?
  begin
    TimelineTopic.write_activity(notification, scope: @scope)
  rescue StandardError => e
    raise ActivityError.new "Failed to write to stream: #{notification}, #{e}"
  end
end

#set_input(start:, stop:, kind: nil, data: nil, events: nil, fulfillment: nil) ⇒ Object

Set the values of the instance, @start, @kind, @data, @events…



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# File 'lib/cosmos/models/activity_model.rb', line 194

def set_input(start:, stop:, kind: nil, data: nil, events: nil, fulfillment: nil)
  begin
    DateTime.strptime(start.to_s, '%s')
    DateTime.strptime(stop.to_s, '%s')
  rescue ArgumentError
    raise ActivityInputError.new "invalid input must be seconds: #{start}, #{stop}"
  end
  @start = start
  @stop = stop
  @duration = @stop - @start
  @fulfillment = fulfillment.nil? ? false : fulfillment
  @kind = kind.nil? ? @kind : kind
  @data = data.nil? ? @data : data
  @events = events.nil? ? Array.new : events
end

#update(start:, stop:, kind:, data:) ⇒ Object

Update the Redis hash at primary_key and remove the current activity at the current score and update the score to the new score equal to the start Epoch time this uses a multi to execute both the remove and create. The member via the JSON generated via calling as_json



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# File 'lib/cosmos/models/activity_model.rb', line 228

def update(start:, stop:, kind:, data:)
  array = Store.zrangebyscore(@primary_key, @start, @start)
  if array.length == 0
    raise ActivityError.new "failed to find activity at: #{@start}"
  end

  validate_input(start: start, stop: stop, kind: kind, data: data)
  old_start = @start
  set_input(start: start, stop: stop, kind: kind, data: data, events: @events)
  @updated_at = Time.now.to_nsec_from_epoch
  # copy of create
  collision = validate_time(old_start)
  unless collision.nil?
    raise ActivityOverlapError.new "failed to update #{old_start}, no activities can overlap, collision: #{collision}"
  end

  add_event(status: 'updated')
  Store.multi do |multi|
    multi.zremrangebyscore(@primary_key, old_start, old_start)
    multi.zadd(@primary_key, @start, JSON.generate(self.as_json))
  end
  notify(kind: 'updated', extra: old_start)
  return @start
end

#validate_input(start:, stop:, kind:, data:) ⇒ Object

validate the input to the rules we have created for timelines.

  • A task’s start MUST NOT be in the past.

  • A task’s start MUST be before the stop.

  • A task CAN NOT be longer than MAX_DURATION (86400) in seconds.

  • A task MUST have a kind.

  • A task MUST have a data object/hash.



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# File 'lib/cosmos/models/activity_model.rb', line 169

def validate_input(start:, stop:, kind:, data:)
  begin
    DateTime.strptime(start.to_s, '%s')
    DateTime.strptime(stop.to_s, '%s')
  rescue Date::Error
    raise ActivityInputError.new "failed validation input must be seconds: #{start}, #{stop}"
  end
  now_i = Time.now.to_i + 10
  duration = stop - start
  if now_i >= start
    raise ActivityInputError.new "activity must be in the future, current_time: #{now_i} vs #{start}"
  elsif duration >= MAX_DURATION
    raise ActivityInputError.new "activity can not be longer than #{MAX_DURATION} seconds"
  elsif duration <= 0
    raise ActivityInputError.new "start: #{start} must be before stop: #{stop}"
  elsif kind.nil?
    raise ActivityInputError.new "kind must not be nil: #{kind}"
  elsif data.nil?
    raise ActivityInputError.new "data must not be nil: #{data}"
  elsif data.is_a?(Hash) == false
    raise ActivityInputError.new "data must be a json object/hash: #{data}"
  end
end

#validate_time(ignore_score = nil) ⇒ Object

validate_time will be called on create this will pull the time up to MAX_DURATION of an activity this will make sure that the activity is the only activity on the timeline for the duration of the activity. Score is the Seconds since the Unix Epoch: (%s) Number of seconds since 1970-01-01 00:00:00 UTC. We then search back from the stop of the activity and check to see if any activities are in the last x seconds (MAX_DURATION), if the zrange rev byscore finds activites from in reverse order so the first task is the closest task to the current score. In this a parameter ignore_score allows the request to ignore that time and skip to the next time but if nothing is found in the time range we can return nil.

Parameters:

  • ignore_score (Integer) (defaults to: nil) —

    • should be nil unless you want to ignore a time when doing an update



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# File 'lib/cosmos/models/activity_model.rb', line 147

def validate_time(ignore_score = nil)
  max_score = @start - MAX_DURATION
  array = Store.zrevrangebyscore(@primary_key, @stop, max_score)
  array.each do |value|
    activity = JSON.parse(value)
    if ignore_score == activity['start']
      next
    elsif activity['stop'] > @start
      return activity['start']
    else
      return nil
    end
  end
  return nil
end