Class: PostHog::FeatureFlagsPoller

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/posthog/feature_flags.rb

Instance Method Summary collapse

Methods included from Logging

included, #logger

Constructor Details

#initialize(polling_interval, personal_api_key, project_api_key, host) ⇒ FeatureFlagsPoller

Returns a new instance of FeatureFlagsPoller.



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# File 'lib/posthog/feature_flags.rb', line 11

def initialize(polling_interval, personal_api_key, project_api_key, host)
  @polling_interval = polling_interval || 60 * 5
  @personal_api_key = personal_api_key
  @project_api_key = project_api_key
  @host = host || 'app.posthog.com'
  @feature_flags = Concurrent::Array.new
  @loaded_flags_successfully_once = Concurrent::AtomicBoolean.new

  @task =
    Concurrent::TimerTask.new(
      execution_interval: polling_interval,
      timeout_interval: 15
    ) { _load_feature_flags }

  # load once before timer
  load_feature_flags
  @task.execute
end

Instance Method Details

#is_feature_enabled(key, distinct_id, default_result = false) ⇒ Object 



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# File 'lib/posthog/feature_flags.rb', line 30

def is_feature_enabled(key, distinct_id, default_result = false)
  # make sure they're loaded on first run
  load_feature_flags

  return default_result unless @loaded_flags_successfully_once

  feature_flag = nil


  @feature_flags.each do |flag|
    if key == flag['key']
      feature_flag = flag
      break
    end
  end

  return default_result if !feature_flag

  flag_rollout_pctg =
    if feature_flag['rollout_percentage']
      feature_flag['rollout_percentage']
    else
      100
    end
  if feature_flag['is_simple_flag']
    return is_simple_flag_enabled(key, distinct_id, flag_rollout_pctg)
  else
    data = { 'distinct_id' => distinct_id }
    res = _request('POST', 'decide', false, data)
    return res['featureFlags'].include? key
  end

  return false
end

#is_simple_flag_enabled(key, distinct_id, rollout_percentage) ⇒ Object 



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# File 'lib/posthog/feature_flags.rb', line 65

def is_simple_flag_enabled(key, distinct_id, rollout_percentage)
  hash = Digest::SHA1.hexdigest "#{key}.#{distinct_id}"
  return(
    (Integer(hash[0..14], 16).to_f / 0xfffffffffffffff) <=
      (rollout_percentage / 100)
  )
end

#load_feature_flags(force_reload = false) ⇒ Object 



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# File 'lib/posthog/feature_flags.rb', line 73

def load_feature_flags(force_reload = false)
  if @loaded_flags_successfully_once.false? || force_reload
    _load_feature_flags
  end
end

#shutdown_poller ⇒ Object 



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# File 'lib/posthog/feature_flags.rb', line 79

def shutdown_poller()
  @task.shutdown
end