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# frozen_string_literal: true
module Gitlab
module UsageDataCounters
module HLLRedisCounter
DEFAULT_WEEKLY_KEY_EXPIRY_LENGTH = 6.weeks
DEFAULT_DAILY_KEY_EXPIRY_LENGTH = 29.days
DEFAULT_REDIS_SLOT = ''.freeze
UnknownEvent = Class.new(StandardError)
UnknownAggregation = Class.new(StandardError)
KNOWN_EVENTS_PATH = 'lib/gitlab/usage_data_counters/known_events.yml'.freeze
ALLOWED_AGGREGATIONS = %i(daily weekly).freeze
# Track event on entity_id
# Increment a Redis HLL counter for unique event_name and entity_id
#
# All events should be added to know_events file lib/gitlab/usage_data_counters/known_events.yml
#
# Event example:
#
# - name: g_compliance_dashboard # Unique event name
# redis_slot: compliance # Optional slot name, if not defined it will use name as a slot, used for totals
# category: compliance # Group events in categories
# expiry: 29 # Optional expiration time in days, default value 29 days for daily and 6.weeks for weekly
# aggregation: daily # Aggregation level, keys are stored daily or weekly
#
# Usage:
#
# * Track event: Gitlab::UsageDataCounters::HLLRedisCounter.track_event(user_id, 'g_compliance_dashboard')
# * Get unique counts per user: Gitlab::UsageDataCounters::HLLRedisCounter.unique_events(event_names: 'g_compliance_dashboard', start_date: 28.days.ago, end_date: Date.current)
class << self
def track_event(entity_id, event_name, time = Time.zone.now)
event = event_for(event_name)
raise UnknownEvent.new("Unknown event #{event_name}") unless event.present?
Gitlab::Redis::HLL.add(key: redis_key(event, time), value: entity_id, expiry: expiry(event))
end
def unique_events(event_names:, start_date:, end_date:)
events = events_for(Array(event_names))
raise 'Events should be in same slot' unless events_in_same_slot?(events)
raise 'Events should be in same category' unless events_in_same_category?(events)
raise 'Events should have same aggregation level' unless events_same_aggregation?(events)
aggregation = events.first[:aggregation]
keys = keys_for_aggregation(aggregation, events: events, start_date: start_date, end_date: end_date)
Gitlab::Redis::HLL.count(keys: keys)
end
def events_for_category(category)
known_events.select { |event| event[:category] == category }.map { |event| event[:name] }
end
private
def keys_for_aggregation(aggregation, events:, start_date:, end_date:)
if aggregation.to_sym == :daily
daily_redis_keys(events: events, start_date: start_date, end_date: end_date)
else
weekly_redis_keys(events: events, start_date: start_date, end_date: end_date)
end
end
def known_events
@known_events ||= YAML.load_file(Rails.root.join(KNOWN_EVENTS_PATH)).map(&:with_indifferent_access)
end
def known_events_names
known_events.map { |event| event[:name] }
end
def events_in_same_slot?(events)
slot = events.first[:redis_slot]
events.all? { |event| event[:redis_slot] == slot }
end
def events_in_same_category?(events)
category = events.first[:category]
events.all? { |event| event[:category] == category }
end
def events_same_aggregation?(events)
aggregation = events.first[:aggregation]
events.all? { |event| event[:aggregation] == aggregation }
end
def expiry(event)
return event[:expiry] if event[:expiry].present?
event[:aggregation].to_sym == :daily ? DEFAULT_DAILY_KEY_EXPIRY_LENGTH : DEFAULT_WEEKLY_KEY_EXPIRY_LENGTH
end
def event_for(event_name)
known_events.find { |event| event[:name] == event_name }
end
def events_for(event_names)
known_events.select { |event| event_names.include?(event[:name]) }
end
def redis_slot(event)
event[:redis_slot] || DEFAULT_REDIS_SLOT
end
# Compose the key in order to store events daily or weekly
def redis_key(event, time)
raise UnknownEvent.new("Unknown event #{event[:name]}") unless known_events_names.include?(event[:name].to_s)
raise UnknownAggregation.new("Use :daily or :weekly aggregation") unless ALLOWED_AGGREGATIONS.include?(event[:aggregation].to_sym)
slot = redis_slot(event)
key = if slot.present?
event[:name].to_s.gsub(slot, "{#{slot}}")
else
"{#{event[:name]}}"
end
if event[:aggregation].to_sym == :daily
year_day = time.strftime('%G-%j')
"#{year_day}-#{key}"
else
year_week = time.strftime('%G-%V')
"#{key}-#{year_week}"
end
end
def daily_redis_keys(events:, start_date:, end_date:)
(start_date.to_date..end_date.to_date).map do |date|
events.map { |event| redis_key(event, date) }
end.flatten
end
def weekly_redis_keys(events:, start_date:, end_date:)
weeks = end_date.to_date.cweek - start_date.to_date.cweek
weeks = 1 if weeks == 0
(0..(weeks - 1)).map do |week_increment|
events.map { |event| redis_key(event, start_date + week_increment * 7.days) }
end.flatten
end
end
end
end
end
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