Class: PostHog::FeatureFlagsPoller Private

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

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Polls and evaluates feature flag definitions for Client.

Constant Summary

Constants included from Utils

Utils::UTC_OFFSET_WITHOUT_COLON, Utils::UTC_OFFSET_WITH_COLON

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils

convert_to_datetime, date_in_iso8601, datetime_in_iso8601, deep_symbolize_keys, formatted_offset, get_by_symbol_or_string_key, is_valid_regex, isoify_dates, isoify_dates!, seconds_to_utc_offset, stringify_keys, symbolize_keys, symbolize_keys!, time_in_iso8601, uid

Methods included from Logging

included, #logger

Constructor Details

#initialize(polling_interval, personal_api_key, project_api_key, host, feature_flag_request_timeout_seconds, on_error = nil, flag_definition_cache_provider: nil) ⇒ FeatureFlagsPoller

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of FeatureFlagsPoller.

Parameters:

  • polling_interval (Integer, nil) —

    Seconds between local feature flag definition polls.

  • personal_api_key (String, nil) —

    Personal API key used to fetch local evaluation definitions.

  • project_api_key (String) —

    Project API key.

  • host (String) —

    PostHog API host URL.

  • feature_flag_request_timeout_seconds (Integer) —

    Timeout for feature flag requests.

  • on_error (Proc, nil) (defaults to: nil) —

    Callback invoked as ‘on_error.call(status, error)`.

  • flag_definition_cache_provider (Object, nil) (defaults to: nil) —

    Optional PostHog::FlagDefinitionCacheProvider implementation.



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/posthog/feature_flags.rb', line 37

def initialize(
  polling_interval,
  personal_api_key,
  project_api_key,
  host,
  feature_flag_request_timeout_seconds,
  on_error = nil,
  flag_definition_cache_provider: nil
)
  @polling_interval = polling_interval || 30
  @personal_api_key = personal_api_key
  @project_api_key = project_api_key
  @host = host
  @feature_flags = Concurrent::Array.new
  @group_type_mapping = Concurrent::Hash.new
  @cohorts = Concurrent::Hash.new
  @loaded_flags_successfully_once = Concurrent::AtomicBoolean.new
  @feature_flags_by_key = nil
  @feature_flag_request_timeout_seconds = feature_flag_request_timeout_seconds
  @on_error = on_error || proc { |status, error| }
  @quota_limited = Concurrent::AtomicBoolean.new(false)
  @flags_etag = Concurrent::AtomicReference.new(nil)
  @flag_definitions_loaded_at = nil

  @flag_definition_cache_provider = flag_definition_cache_provider
  FlagDefinitionCacheProvider.validate!(@flag_definition_cache_provider) if @flag_definition_cache_provider

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

  # If no personal API key, disable local evaluation & thus polling for definitions
  if @personal_api_key.nil?
    logger.info 'No personal API key provided, disabling local evaluation'
    @loaded_flags_successfully_once.make_true
  else
    # load once before timer
    load_feature_flags
    @task.execute
  end
end

Instance Attribute Details

#feature_flags_by_key ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



86
87
88
 
# File 'lib/posthog/feature_flags.rb', line 86

def feature_flags_by_key
  @feature_flags_by_key
end

#flag_definitions_loaded_at ⇒ Object (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



86
87
88
 
# File 'lib/posthog/feature_flags.rb', line 86

def flag_definitions_loaded_at
  @flag_definitions_loaded_at
end

Class Method Details

.compare(lhs, rhs, operator) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Class methods



413
414
415
416
417
418
419
420
421
422
423
424
425
426
 
# File 'lib/posthog/feature_flags.rb', line 413

def self.compare(lhs, rhs, operator)
  case operator
  when 'gt'
    lhs > rhs
  when 'gte'
    lhs >= rhs
  when 'lt'
    lhs < rhs
  when 'lte'
    lhs <= rhs
  else
    raise "Invalid operator: #{operator}"
  end
end

.match_cohort(property, property_values, cohort_properties) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
 
# File 'lib/posthog/feature_flags.rb', line 672

def self.match_cohort(property, property_values, cohort_properties)
  # Cohort properties are in the form of property groups like this:
  # {
  #   "cohort_id" => {
  #     "type" => "AND|OR",
  #     "values" => [{
  #        "key" => "property_name", "value" => "property_value"
  #     }]
  #   }
  # }
  cohort_id = extract_value(property, :value).to_s
  property_group = find_cohort_property(cohort_properties, cohort_id)

  unless property_group
    raise RequiresServerEvaluation,
          "cohort #{cohort_id} not found in local cohorts - likely a static cohort that requires server evaluation"
  end

  match_property_group(property_group, property_values, cohort_properties)
end

.match_property(property, property_values, cohort_properties = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
 
# File 'lib/posthog/feature_flags.rb', line 563

def self.match_property(property, property_values, cohort_properties = {})
  # only looks for matches where key exists in property_values
  # doesn't support operator is_not_set

  PostHog::Utils.symbolize_keys! property
  PostHog::Utils.symbolize_keys! property_values

  # Handle cohort properties
  return match_cohort(property, property_values, cohort_properties) if extract_value(property, :type) == 'cohort'

  key = property[:key].to_sym
  value = property[:value]
  operator = property[:operator] || 'exact'

  if !property_values.key?(key)
    raise InconclusiveMatchError, "Property #{key} not found in property_values"
  elsif operator == 'is_not_set'
    raise InconclusiveMatchError, 'Operator is_not_set not supported'
  end

  override_value = property_values[key]

  case operator
  when 'exact', 'is_not'
    if value.is_a?(Array)
      values_stringified = value.map { |val| val.to_s.downcase }
      return values_stringified.any?(override_value.to_s.downcase) if operator == 'exact'

      return values_stringified.none?(override_value.to_s.downcase)

    end
    if operator == 'exact'
      value.to_s.downcase == override_value.to_s.downcase
    else
      value.to_s.downcase != override_value.to_s.downcase
    end
  when 'is_set'
    property_values.key?(key)
  when 'icontains'
    override_value.to_s.downcase.include?(value.to_s.downcase)
  when 'not_icontains'
    !override_value.to_s.downcase.include?(value.to_s.downcase)
  when 'regex'
    PostHog::Utils.is_valid_regex(value.to_s) && !Regexp.new(value.to_s).match(override_value.to_s).nil?
  when 'not_regex'
    PostHog::Utils.is_valid_regex(value.to_s) && Regexp.new(value.to_s).match(override_value.to_s).nil?
  when 'gt', 'gte', 'lt', 'lte'
    parsed_value = nil
    begin
      parsed_value = Float(value)
    rescue StandardError # rubocop:disable Lint/SuppressedException
    end
    if !parsed_value.nil? && !override_value.nil?
      if override_value.is_a?(String)
        compare(override_value, value.to_s, operator)
      else
        compare(override_value, parsed_value, operator)
      end
    else
      compare(override_value.to_s, value.to_s, operator)
    end
  when 'is_date_before', 'is_date_after'
    override_date = PostHog::Utils.convert_to_datetime(override_value.to_s)
    parsed_date = relative_date_parse_for_feature_flag_matching(value.to_s)

    parsed_date = PostHog::Utils.convert_to_datetime(value.to_s) if parsed_date.nil?

    raise InconclusiveMatchError, 'Invalid date format' unless parsed_date

    if operator == 'is_date_before'
      override_date < parsed_date
    elsif operator == 'is_date_after'
      override_date > parsed_date
    end
  when 'semver_eq', 'semver_neq', 'semver_gt', 'semver_gte', 'semver_lt', 'semver_lte'
    override_parsed = parse_semver(override_value)
    flag_parsed = parse_semver(value)

    case operator
    when 'semver_eq'
      override_parsed == flag_parsed
    when 'semver_neq'
      override_parsed != flag_parsed
    when 'semver_gt'
      (override_parsed <=> flag_parsed) == 1
    when 'semver_gte'
      (override_parsed <=> flag_parsed) >= 0
    when 'semver_lt'
      (override_parsed <=> flag_parsed) == -1
    when 'semver_lte'
      (override_parsed <=> flag_parsed) <= 0
    end
  when 'semver_tilde'
    override_parsed = parse_semver(override_value)
    lower, upper = semver_tilde_bounds(value)
    (override_parsed <=> lower) >= 0 && (override_parsed <=> upper) == -1
  when 'semver_caret'
    override_parsed = parse_semver(override_value)
    lower, upper = semver_caret_bounds(value)
    (override_parsed <=> lower) >= 0 && (override_parsed <=> upper) == -1
  when 'semver_wildcard'
    override_parsed = parse_semver(override_value)
    lower, upper = semver_wildcard_bounds(value)
    (override_parsed <=> lower) >= 0 && (override_parsed <=> upper) == -1
  else
    raise InconclusiveMatchError, "Unknown operator: #{operator}"
  end
end

.match_property_group(property_group, property_values, cohort_properties) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



693
694
695
696
697
698
699
700
701
702
703
704
705
706
 
# File 'lib/posthog/feature_flags.rb', line 693

def self.match_property_group(property_group, property_values, cohort_properties)
  return true if property_group.nil? || property_group.empty?

  group_type = extract_value(property_group, :type)
  properties = extract_value(property_group, :values)

  return true if properties.nil? || properties.empty?

  if nested_property_group?(properties)
    match_nested_property_group(properties, group_type, property_values, cohort_properties)
  else
    match_regular_property_group(properties, group_type, property_values, cohort_properties)
  end
end

.matches_dependency_value(expected_value, actual_value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
 
# File 'lib/posthog/feature_flags.rb', line 871

def self.matches_dependency_value(expected_value, actual_value)
  # Check if the actual flag value matches the expected dependency value.
  #
  # - String variant case: check for exact match or boolean true
  # - Boolean case: must match expected boolean value
  #
  # @param expected_value [Object] The expected value from the property
  # @param actual_value [Object] The actual value returned by the flag evaluation
  # @return [Boolean] True if the values match according to flag dependency rules

  # String variant case - check for exact match or boolean true
  if actual_value.is_a?(String) && !actual_value.empty?
    if expected_value.is_a?(TrueClass) || expected_value.is_a?(FalseClass)
      # Any variant matches boolean true
      return expected_value
    elsif expected_value.is_a?(String)
      # variants are case-sensitive, hence our comparison is too
      return actual_value == expected_value
    else
      return false
    end

  # Boolean case - must match expected boolean value
  elsif actual_value.is_a?(TrueClass) || actual_value.is_a?(FalseClass)
    return actual_value == expected_value if expected_value.is_a?(TrueClass) || expected_value.is_a?(FalseClass)
  end

  # Default case
  false
end

.parse_semver(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parse a semver string into a comparable [major, minor, patch] integer array. Handles v-prefix, whitespace, pre-release suffixes. Defaults missing components to 0.

Raises:



471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
 
# File 'lib/posthog/feature_flags.rb', line 471

def self.parse_semver(value)
  raise InconclusiveMatchError, 'Invalid semver format' if value.nil?

  text = value.to_s.strip.sub(/^[vV]/, '')

  raise InconclusiveMatchError, 'Invalid semver format' if text.empty?

  # Strip pre-release and build metadata suffixes
  text = text.split('-')[0].split('+')[0]
  parts = text.split('.')

  raise InconclusiveMatchError, 'Invalid semver format' if parts.empty? || parts[0].to_s.empty?

  major = parse_semver_numeric(parts[0])
  minor = parts.length > 1 ? parse_semver_numeric(parts[1]) : 0
  patch = parts.length > 2 ? parse_semver_numeric(parts[2]) : 0

  [major, minor, patch]
end

.parse_semver_numeric(part) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parse a single semver numeric identifier, rejecting empty, non-digit, or leading-zero values per semver 2.0.0 §2.

Raises:



461
462
463
464
465
466
467
 
# File 'lib/posthog/feature_flags.rb', line 461

def self.parse_semver_numeric(part)
  raise InconclusiveMatchError, 'Invalid semver format' if part.nil? || part.empty? || part !~ /^\d+$/
  # Semver 2.0.0 §2: numeric identifiers MUST NOT include leading zeros.
  raise InconclusiveMatchError, 'Invalid semver format' if part.length > 1 && part[0] == '0'

  part.to_i
end

.relative_date_parse_for_feature_flag_matching(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
 
# File 'lib/posthog/feature_flags.rb', line 428

def self.relative_date_parse_for_feature_flag_matching(value)
  match = /^-?([0-9]+)([a-z])$/.match(value)
  parsed_dt = DateTime.now.new_offset(0)
  return unless match

  number = match[1].to_i

  if number >= 10_000
    # Guard against overflow, disallow numbers greater than 10_000
    return nil
  end

  interval = match[2]
  case interval
  when 'h'
    parsed_dt -= (number / 24.0)
  when 'd'
    parsed_dt = parsed_dt.prev_day(number)
  when 'w'
    parsed_dt = parsed_dt.prev_day(number * 7)
  when 'm'
    parsed_dt = parsed_dt.prev_month(number)
  when 'y'
    parsed_dt = parsed_dt.prev_year(number)
  else
    return nil
  end

  parsed_dt
end

.semver_caret_bounds(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns bounds for caret (^) range per semver spec: ^X.Y.Z where X > 0 → >=X.Y.Z <(X+1).0.0 ^0.Y.Z where Y > 0 → >=0.Y.Z <0.(Y+1).0 ^0.0.Z → >=0.0.Z <0.0.(Z+1)



519
520
521
522
523
524
525
526
527
528
529
530
531
532
 
# File 'lib/posthog/feature_flags.rb', line 519

def self.semver_caret_bounds(value)
  major, minor, patch = parse_semver(value)
  lower = [major, minor, patch]

  upper = if major.positive?
            [major + 1, 0, 0]
          elsif minor.positive?
            [0, minor + 1, 0]
          else
            [0, 0, patch + 1]
          end

  [lower, upper]
end

.semver_tilde_bounds(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns bounds for tilde (~) range: ~X → >=X.0.0 <(X+1).0.0 ~X.Y → >=X.Y.0 <X.(Y+1).0 ~X.Y.Z → >=X.Y.Z <X.(Y+1).0



495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
 
# File 'lib/posthog/feature_flags.rb', line 495

def self.semver_tilde_bounds(value)
  major, minor, patch = parse_semver(value)
  lower = [major, minor, patch]

  # Determine how many components were provided
  text = value.to_s.strip.sub(/^[vV]/, '')
  text = text.split('-')[0].split('+')[0]
  component_count = text.split('.').length

  upper = if component_count == 1
            # Major-only: bump major
            [major + 1, 0, 0]
          else
            # Major.minor or major.minor.patch: bump minor
            [major, minor + 1, 0]
          end

  [lower, upper]
end

.semver_wildcard_bounds(value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns bounds for wildcard (*) range: X.* or X → >=X.0.0 <(X+1).0.0 X.Y.* → >=X.Y.0 <X.(Y+1).0

Raises:



537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
 
# File 'lib/posthog/feature_flags.rb', line 537

def self.semver_wildcard_bounds(value)
  cleaned = value.to_s.strip.sub(/^[vV]/, '').gsub('*', '').chomp('.')
  parts = cleaned.split('.').reject(&:empty?)

  raise InconclusiveMatchError, 'Invalid semver wildcard format' if parts.empty?

  numeric = parts.map do |part|
    parse_semver_numeric(part)
  rescue InconclusiveMatchError
    raise InconclusiveMatchError, 'Invalid semver wildcard format'
  end

  major = numeric[0]
  case numeric.length
  when 1
    [[major, 0, 0], [major + 1, 0, 0]]
  when 2
    minor = numeric[1]
    [[major, minor, 0], [major, minor + 1, 0]]
  else
    minor = numeric[1]
    patch = numeric[2]
    [[major, minor, patch], [major, minor, patch + 1]]
  end
end

Instance Method Details

#_apply_flag_definitions(data) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
 
# File 'lib/posthog/feature_flags.rb', line 1174

def _apply_flag_definitions(data)
  flags = get_by_symbol_or_string_key(data, 'flags') || []
  group_type_mapping = get_by_symbol_or_string_key(data, 'group_type_mapping') || {}
  cohorts = get_by_symbol_or_string_key(data, 'cohorts') || {}

  @feature_flags = Concurrent::Array.new(flags.map { |f| deep_symbolize_keys(f) })

  new_by_key = {}
  @feature_flags.each do |flag|
    new_by_key[flag[:key]] = flag unless flag[:key].nil?
  end
  @feature_flags_by_key = new_by_key

  @group_type_mapping = Concurrent::Hash[deep_symbolize_keys(group_type_mapping)]
  @cohorts = Concurrent::Hash[deep_symbolize_keys(cohorts)]

  logger.debug "Loaded #{@feature_flags.length} feature flags and #{@cohorts.length} cohorts"
  @flag_definitions_loaded_at = (Time.now.to_f * 1000).to_i
  @loaded_flags_successfully_once.make_true if @loaded_flags_successfully_once.false?
end

#_compute_flag_locally(flag, distinct_id, groups = {}, person_properties = {}, group_properties = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:



905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
 
# File 'lib/posthog/feature_flags.rb', line 905

def _compute_flag_locally(flag, distinct_id, groups = {}, person_properties = {}, group_properties = {})
  raise RequiresServerEvaluation, 'Flag has experience continuity enabled' if flag[:ensure_experience_continuity]

  return false unless flag[:active]

  # Create evaluation cache for flag dependencies
  evaluation_cache = {}

  flag_filters = flag[:filters] || {}

  aggregation_group_type_index = flag_filters[:aggregation_group_type_index]
  if aggregation_group_type_index.nil?
    return match_feature_flag_properties(flag, distinct_id, person_properties, evaluation_cache, @cohorts,
                                         groups: groups, group_properties: group_properties)
  end

  group_name = @group_type_mapping[aggregation_group_type_index.to_s.to_sym]

  if group_name.nil?
    logger.warn(
      "[FEATURE FLAGS] Unknown group type index #{aggregation_group_type_index} for feature flag #{flag[:key]}"
    )
    # failover to `/flags/`
    raise InconclusiveMatchError, 'Flag has unknown group type index'
  end

  group_name_symbol = group_name.to_sym

  unless groups.key?(group_name_symbol)
    # Group flags are never enabled if appropriate `groups` aren't passed in
    # don't failover to `/flags/`, since response will be the same
    logger.warn "[FEATURE FLAGS] Can't compute group feature flag: #{flag[:key]} without group names passed in"
    return false
  end

  focused_group_properties = group_properties[group_name_symbol]
  match_feature_flag_properties(flag, groups[group_name_symbol], focused_group_properties, evaluation_cache,
                                @cohorts, groups: groups, group_properties: group_properties)
end

#_compute_flag_payload_locally(key, match_value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



945
946
947
948
949
950
951
952
953
954
955
956
 
# File 'lib/posthog/feature_flags.rb', line 945

def _compute_flag_payload_locally(key, match_value)
  return nil if @feature_flags_by_key.nil?

  key = key.to_s
  response = nil
  if [true, false].include? match_value
    response = @feature_flags_by_key.dig(key, :filters, :payloads, match_value.to_s.to_sym)
  elsif match_value.is_a? String
    response = @feature_flags_by_key.dig(key, :filters, :payloads, match_value.to_sym)
  end
  response
end

#_fetch_and_apply_flag_definitions ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
 
# File 'lib/posthog/feature_flags.rb', line 1117

def _fetch_and_apply_flag_definitions
  begin
    res = _request_feature_flag_definitions(etag: @flags_etag.value)
  rescue StandardError => e
    @on_error.call(-1, e.to_s)
    return
  end

  # Handle 304 Not Modified - flags haven't changed, skip processing
  # Only update ETag if the 304 response includes one
  if res[:not_modified]
    @flags_etag.value = res[:etag] if res[:etag]
    logger.debug '[FEATURE FLAGS] Flags not modified (304), using cached data'
    return
  end

  # Handle quota limits with 402 status
  if res.is_a?(Hash) && res[:status] == 402
    logger.warn(
      '[FEATURE FLAGS] Feature flags quota limit exceeded - unsetting all local flags. ' \
      'Learn more about billing limits at https://posthog.com/docs/billing/limits-alerts'
    )
    @feature_flags = Concurrent::Array.new
    @feature_flags_by_key = {}
    @group_type_mapping = Concurrent::Hash.new
    @cohorts = Concurrent::Hash.new
    @loaded_flags_successfully_once.make_false
    @quota_limited.make_true
    return
  end

  if res.key?(:flags)
    # Only update ETag on successful responses with flag data
    @flags_etag.value = res[:etag]

    _apply_flag_definitions(res)
    _store_in_cache_provider
  else
    logger.debug "Failed to load feature flags: #{res}"
  end
end

#_hash(key, distinct_id, salt = '') ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This function takes a distinct_id and a feature flag key and returns a float between 0 and 1. Given the same distinct_id and key, it’ll always return the same float. These floats are uniformly distributed between 0 and 1, so if we want to show this feature to 20% of traffic we can do _hash(key, distinct_id) < 0.2



1058
1059
1060
1061
 
# File 'lib/posthog/feature_flags.rb', line 1058

def _hash(key, distinct_id, salt = '')
  hash_key = Digest::SHA1.hexdigest "#{key}.#{distinct_id}#{salt}"
  (Integer(hash_key[0..14], 16).to_f / 0xfffffffffffffff)
end

#_load_feature_flags ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
 
# File 'lib/posthog/feature_flags.rb', line 1085

def _load_feature_flags
  should_fetch = true

  if @flag_definition_cache_provider
    begin
      should_fetch = @flag_definition_cache_provider.should_fetch_flag_definitions?
    rescue StandardError => e
      logger.error("[FEATURE FLAGS] Cache provider should_fetch error: #{e}")
      should_fetch = true
    end
  end

  unless should_fetch
    begin
      cached_data = @flag_definition_cache_provider.flag_definitions
      if cached_data
        logger.debug '[FEATURE FLAGS] Using cached flag definitions from external cache'
        _apply_flag_definitions(cached_data)
        return
      elsif @feature_flags.empty?
        # Emergency fallback: cache empty and no flags loaded -> fetch from API
        should_fetch = true
      end
    rescue StandardError => e
      logger.error("[FEATURE FLAGS] Cache provider get error: #{e}")
      should_fetch = true
    end
  end

  _fetch_and_apply_flag_definitions if should_fetch
end

#_mask_tokens_in_url(url) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:enable Lint/ShadowedException



1277
1278
1279
 
# File 'lib/posthog/feature_flags.rb', line 1277

def _mask_tokens_in_url(url)
  url.gsub(/token=([^&]{10})[^&]*/, 'token=\1...')
end

#_request(uri, request_object, timeout = nil, include_etag: false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:disable Lint/ShadowedException



1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
 
# File 'lib/posthog/feature_flags.rb', line 1226

def _request(uri, request_object, timeout = nil, include_etag: false)
  request_object['User-Agent'] = "posthog-ruby#{PostHog::VERSION}"
  request_timeout = timeout || 10

  begin
    Net::HTTP.start(
      uri.hostname,
      uri.port,
      use_ssl: uri.scheme == 'https',
      read_timeout: request_timeout
    ) do |http|
      res = http.request(request_object)
      status_code = res.code.to_i
      etag = include_etag ? res['ETag'] : nil

      # Handle 304 Not Modified - return special response indicating no change
      if status_code == 304
        logger.debug("#{request_object.method} #{_mask_tokens_in_url(uri.to_s)} returned 304 Not Modified")
        return { not_modified: true, etag: etag, status: status_code }
      end

      # Parse response body to hash
      begin
        response = JSON.parse(res.body, { symbolize_names: true })
        # Only add status (and etag if requested) if response is a hash
        extra_fields = { status: status_code }
        extra_fields[:etag] = etag if include_etag
        response = response.merge(extra_fields) if response.is_a?(Hash)
        return response
      rescue JSON::ParserError
        # Handle case when response isn't valid JSON
        error_response = { error: 'Invalid JSON response', body: res.body, status: status_code }
        error_response[:etag] = etag if include_etag
        return error_response
      end
    end
  rescue Timeout::Error,
         Errno::EINVAL,
         Errno::ECONNRESET,
         EOFError,
         Net::HTTPBadResponse,
         Net::HTTPHeaderSyntaxError,
         Net::ReadTimeout,
         Net::WriteTimeout,
         Net::ProtocolError
    logger.debug("Unable to complete request to #{uri}")
    raise
  end
end

#_request_feature_flag_definitions(etag: nil) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1195
1196
1197
1198
1199
1200
1201
1202
1203
 
# File 'lib/posthog/feature_flags.rb', line 1195

def _request_feature_flag_definitions(etag: nil)
  uri = URI("#{@host}/flags/definitions")
  uri.query = URI.encode_www_form([['token', @project_api_key], %w[send_cohorts true]])
  req = Net::HTTP::Get.new(uri)
  req['Authorization'] = "Bearer #{@personal_api_key}"
  req['If-None-Match'] = etag if etag

  _request(uri, req, nil, include_etag: true)
end

#_request_feature_flag_evaluation(data = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1205
1206
1207
1208
1209
1210
1211
1212
1213
 
# File 'lib/posthog/feature_flags.rb', line 1205

def _request_feature_flag_evaluation(data = {})
  uri = URI("#{@host}/flags/?v=2")
  req = Net::HTTP::Post.new(uri)
  req['Content-Type'] = 'application/json'
  data['token'] = @project_api_key
  req.body = data.to_json

  _request(uri, req, @feature_flag_request_timeout_seconds)
end

#_request_remote_config_payload(flag_key) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1215
1216
1217
1218
1219
1220
1221
1222
1223
 
# File 'lib/posthog/feature_flags.rb', line 1215

def _request_remote_config_payload(flag_key)
  uri = URI("#{@host}/api/projects/@current/feature_flags/#{flag_key}/remote_config")
  uri.query = URI.encode_www_form([['token', @project_api_key]])
  req = Net::HTTP::Get.new(uri)
  req['Content-Type'] = 'application/json'
  req['Authorization'] = "Bearer #{@personal_api_key}"

  _request(uri, req, @feature_flag_request_timeout_seconds)
end

#_store_in_cache_provider ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
 
# File 'lib/posthog/feature_flags.rb', line 1159

def _store_in_cache_provider
  return unless @flag_definition_cache_provider

  begin
    data = {
      flags: @feature_flags.to_a,
      group_type_mapping: @group_type_mapping.to_h,
      cohorts: @cohorts.to_h
    }
    @flag_definition_cache_provider.on_flag_definitions_received(data)
  rescue StandardError => e
    logger.error("[FEATURE FLAGS] Cache provider store error: #{e}")
  end
end

#condition_match(flag, distinct_id, condition, properties, evaluation_cache, cohort_properties = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
 
# File 'lib/posthog/feature_flags.rb', line 1032

def condition_match(flag, distinct_id, condition, properties, evaluation_cache, cohort_properties = {})
  rollout_percentage = condition[:rollout_percentage]

  unless (condition[:properties] || []).empty?
    unless condition[:properties].all? do |prop|
      if prop[:type] == 'flag'
        evaluate_flag_dependency(prop, evaluation_cache, distinct_id, properties, cohort_properties)
      else
        FeatureFlagsPoller.match_property(prop, properties, cohort_properties)
      end
    end
      return false
    end

    return true if rollout_percentage.nil?
  end

  return false if !rollout_percentage.nil? && (_hash(flag[:key], distinct_id) > (rollout_percentage.to_f / 100))

  true
end

#evaluate_flag_dependency(property, evaluation_cache, distinct_id, properties, cohort_properties) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Evaluates a flag dependency property according to the dependency chain algorithm.

Parameters:

  • property (Hash) —

    Flag property with type=“flag” and dependency_chain

  • evaluation_cache (Hash) —

    Cache for storing evaluation results

  • distinct_id (String) —

    The distinct ID being evaluated

  • properties (Hash) —

    Person properties for evaluation

  • cohort_properties (Hash) —

    Cohort properties for evaluation

Returns:

  • (Boolean) —

    True if all dependencies in the chain evaluate to true, false otherwise



788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
 
# File 'lib/posthog/feature_flags.rb', line 788

def evaluate_flag_dependency(property, evaluation_cache, distinct_id, properties, cohort_properties)
  if property[:operator] != 'flag_evaluates_to'
    # Should never happen, but just in case
    raise InconclusiveMatchError, "Operator #{property[:operator]} not supported for flag dependencies"
  end

  if @feature_flags_by_key.nil? || evaluation_cache.nil?
    # Cannot evaluate flag dependencies without required context
    raise InconclusiveMatchError,
          "Cannot evaluate flag dependency on '#{property[:key] || 'unknown'}' " \
          'without feature flags loaded or evaluation_cache'
  end

  # Check if dependency_chain is present - it should always be provided for flag dependencies
  unless property.key?(:dependency_chain)
    # Missing dependency_chain indicates malformed server data
    raise InconclusiveMatchError,
          "Flag dependency property for '#{property[:key] || 'unknown'}' " \
          "is missing required 'dependency_chain' field"
  end

  dependency_chain = property[:dependency_chain]

  # Handle circular dependency (empty chain means circular)
  if dependency_chain.empty?
    PostHog::Logging.logger&.debug("Circular dependency detected for flag: #{property[:key]}")
    raise InconclusiveMatchError,
          "Circular dependency detected for flag '#{property[:key] || 'unknown'}'"
  end

  # Evaluate all dependencies in the chain order
  dependency_chain.each do |dep_flag_key|
    unless evaluation_cache.key?(dep_flag_key)
      # Need to evaluate this dependency first
      dep_flag = @feature_flags_by_key[dep_flag_key]
      if dep_flag.nil?
        # Missing flag dependency - cannot evaluate locally
        evaluation_cache[dep_flag_key] = nil
        raise InconclusiveMatchError,
              "Cannot evaluate flag dependency '#{dep_flag_key}' - flag not found in local flags"
      elsif !dep_flag[:active]
        # Check if the flag is active (same check as in _compute_flag_locally)
        evaluation_cache[dep_flag_key] = false
      else
        # Recursively evaluate the dependency using existing instance method
        begin
          dep_result = match_feature_flag_properties(
            dep_flag,
            distinct_id,
            properties,
            evaluation_cache,
            cohort_properties
          )
          evaluation_cache[dep_flag_key] = dep_result
        rescue InconclusiveMatchError => e
          # If we can't evaluate a dependency, store nil and propagate the error
          evaluation_cache[dep_flag_key] = nil
          raise InconclusiveMatchError,
                "Cannot evaluate flag dependency '#{dep_flag_key}': #{e.message}"
        end
      end
    end

    # Check the cached result
    cached_result = evaluation_cache[dep_flag_key]
    if cached_result.nil?
      # Previously inconclusive - raise error again
      raise InconclusiveMatchError,
            "Flag dependency '#{dep_flag_key}' was previously inconclusive"
    elsif !cached_result
      # Definitive False result - dependency failed
      return false
    end
  end

  # Get the expected value of the immediate dependency and the actual value
  expected_value = property[:value]
  # The flag we want to evaluate is defined by :key which should ALSO be the last key in the dependency chain
  actual_value = evaluation_cache[property[:key]]

  self.class.matches_dependency_value(expected_value, actual_value)
end

#get_all_flags(distinct_id, groups = {}, person_properties = {}, group_properties = {}, only_evaluate_locally = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
 
# File 'lib/posthog/feature_flags.rb', line 263

def get_all_flags(
  distinct_id,
  groups = {},
  person_properties = {},
  group_properties = {},
  only_evaluate_locally = false
)
  if @quota_limited.true?
    logger.debug 'Not fetching flags from server - quota limited'
    return {}
  end

  # returns a string hash of all flags
  response = get_all_flags_and_payloads(
    distinct_id,
    groups,
    person_properties,
    group_properties,
    only_evaluate_locally
  )

  response[:featureFlags]
end

#get_all_flags_and_payloads(distinct_id, groups = {}, person_properties = {}, group_properties = {}, only_evaluate_locally = false, raise_on_error = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
 
# File 'lib/posthog/feature_flags.rb', line 287

def get_all_flags_and_payloads(
  distinct_id,
  groups = {},
  person_properties = {},
  group_properties = {},
  only_evaluate_locally = false,
  raise_on_error = false
)
  load_feature_flags

  flags = {}
  payloads = {}
  fallback_to_server = @feature_flags.empty?
  request_id = nil # Only for /flags requests
  evaluated_at = nil # Only for /flags requests

  @feature_flags.each do |flag|
    match_value = _compute_flag_locally(flag, distinct_id, groups, person_properties, group_properties)
    flags[flag[:key]] = match_value
    match_payload = _compute_flag_payload_locally(flag[:key], match_value)
    payloads[flag[:key]] = match_payload if match_payload
  rescue RequiresServerEvaluation, InconclusiveMatchError
    fallback_to_server = true
  rescue StandardError => e
    @on_error.call(-1, "Error computing flag locally: #{e}. #{e.backtrace.join("\n")} ")
    fallback_to_server = true
  end

  errors_while_computing = false
  quota_limited = nil
  status_code = nil

  if fallback_to_server && !only_evaluate_locally
    begin
      flags_and_payloads = get_flags(distinct_id, groups, person_properties, group_properties)
      errors_while_computing = flags_and_payloads[:errorsWhileComputingFlags] || false
      quota_limited = flags_and_payloads[:quotaLimited]
      status_code = flags_and_payloads[:status]

      unless flags_and_payloads.key?(:featureFlags)
        raise StandardError, "Error flags response: #{flags_and_payloads}"
      end

      request_id = flags_and_payloads[:requestId]
      evaluated_at = flags_and_payloads[:evaluatedAt]

      # Check if feature_flags are quota limited
      if quota_limited&.include?('feature_flags')
        logger.warn '[FEATURE FLAGS] Quota limited for feature flags'
        flags = {}
        payloads = {}
      else
        server_flags = stringify_keys(flags_and_payloads[:featureFlags] || {})
        server_payloads = stringify_keys(flags_and_payloads[:featureFlagPayloads] || {})

        if errors_while_computing
          # Merge server results into locally-evaluated results so that flags which
          # failed server-side evaluation (already filtered out by get_flags) don't
          # overwrite valid locally-evaluated values.
          flags = stringify_keys(flags).merge(server_flags)
          payloads = stringify_keys(payloads).merge(server_payloads)
        else
          flags = server_flags
          payloads = server_payloads
        end
      end
    rescue StandardError => e
      @on_error.call(-1, "Error computing flag remotely: #{e}")
      raise if raise_on_error
    end
  end

  {
    featureFlags: flags,
    featureFlagPayloads: payloads,
    requestId: request_id,
    evaluatedAt: evaluated_at,
    errorsWhileComputingFlags: errors_while_computing,
    quotaLimited: quota_limited,
    status: status_code
  }
end

#get_feature_flag(key, distinct_id, groups = {}, person_properties = {}, group_properties = {}, only_evaluate_locally = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
 
# File 'lib/posthog/feature_flags.rb', line 177

def get_feature_flag(
  key,
  distinct_id,
  groups = {},
  person_properties = {},
  group_properties = {},
  only_evaluate_locally = false
)
  key = key.to_s

  # make sure they're loaded on first run
  load_feature_flags

  symbolize_keys! groups
  symbolize_keys! person_properties
  symbolize_keys! group_properties

  group_properties.each_value do |value|
    symbolize_keys!(value)
  end

  response = nil
  payload = nil
  feature_flag = @feature_flags_by_key&.[](key)

  unless feature_flag.nil?
    begin
      response = _compute_flag_locally(feature_flag, distinct_id, groups, person_properties, group_properties)
      payload = _compute_flag_payload_locally(key, response) unless response.nil?
      logger.debug "Successfully computed flag locally: #{key} -> #{response}"
    rescue RequiresServerEvaluation, InconclusiveMatchError => e
      logger.debug "Failed to compute flag #{key} locally: #{e}"
    rescue StandardError => e
      @on_error.call(-1, "Error computing flag locally: #{e}. #{e.backtrace.join("\n")}")
    end
  end

  flag_was_locally_evaluated = !response.nil?

  request_id = nil
  evaluated_at = nil
  feature_flag_error = nil

  if !flag_was_locally_evaluated && !only_evaluate_locally
    begin
      errors = []
      flags_data = get_all_flags_and_payloads(distinct_id, groups, person_properties, group_properties,
                                              only_evaluate_locally, true)
      if flags_data.key?(:featureFlags)
        flags = stringify_keys(flags_data[:featureFlags] || {})
        payloads = stringify_keys(flags_data[:featureFlagPayloads] || {})
        request_id = flags_data[:requestId]
        evaluated_at = flags_data[:evaluatedAt]
      else
        logger.debug "Missing feature flags key: #{flags_data.to_json}"
        flags = {}
        payloads = {}
      end

      status = flags_data[:status]
      errors << FeatureFlagError.api_error(status) if status && status >= 400
      errors << FeatureFlagError::ERRORS_WHILE_COMPUTING if flags_data[:errorsWhileComputingFlags]
      errors << FeatureFlagError::QUOTA_LIMITED if flags_data[:quotaLimited]&.include?('feature_flags')
      errors << FeatureFlagError::FLAG_MISSING unless flags.key?(key.to_s)

      response = flags[key]
      response = false if response.nil?
      payload = payloads[key]
      feature_flag_error = errors.join(',') unless errors.empty?

      logger.debug "Successfully computed flag remotely: #{key} -> #{response}"
    rescue Timeout::Error => e
      @on_error.call(-1, "Timeout while fetching flags remotely: #{e}")
      feature_flag_error = FeatureFlagError::TIMEOUT
    rescue Errno::ECONNRESET, Errno::ECONNREFUSED, EOFError, SocketError => e
      @on_error.call(-1, "Connection error while fetching flags remotely: #{e}")
      feature_flag_error = FeatureFlagError::CONNECTION_ERROR
    rescue StandardError => e
      @on_error.call(-1, "Error computing flag remotely: #{e}. #{e.backtrace.join("\n")}")
      feature_flag_error = FeatureFlagError::UNKNOWN_ERROR
    end
  end

  [response, flag_was_locally_evaluated, request_id, evaluated_at, feature_flag_error, payload]
end

#get_feature_flag_payload(key, distinct_id, match_value = nil, groups = {}, person_properties = {}, group_properties = {}, only_evaluate_locally = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
 
# File 'lib/posthog/feature_flags.rb', line 370

def get_feature_flag_payload(
  key,
  distinct_id,
  match_value = nil,
  groups = {},
  person_properties = {},
  group_properties = {},
  only_evaluate_locally = false
)
  key = key.to_s

  if match_value.nil?
    match_value = get_feature_flag(
      key,
      distinct_id,
      groups,
      person_properties,
      group_properties,
      true
    )[0]
  end
  response = nil
  response = _compute_flag_payload_locally(key, match_value) unless match_value.nil?
  if response.nil? && !only_evaluate_locally
    flags_payloads = get_feature_payloads(distinct_id, groups, person_properties, group_properties)
    response = flags_payloads[key.downcase] || nil
  end
  response
end

#get_feature_payloads(distinct_id, groups = {}, person_properties = {}, group_properties = {}, _only_evaluate_locally = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/posthog/feature_flags.rb', line 114

def get_feature_payloads(
  distinct_id,
  groups = {},
  person_properties = {},
  group_properties = {},
  _only_evaluate_locally = false
)
  flags_data = get_all_flags_and_payloads(
    distinct_id,
    groups,
    person_properties,
    group_properties
  )

  if flags_data.key?(:featureFlagPayloads)
    stringify_keys(flags_data[:featureFlagPayloads] || {})
  else
    logger.debug "Missing feature flag payloads key: #{flags_data.to_json}"
    {}
  end
end

#get_feature_variants(distinct_id, groups = {}, person_properties = {}, group_properties = {}, only_evaluate_locally = false, raise_on_error = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
 
# File 'lib/posthog/feature_flags.rb', line 88

def get_feature_variants(
  distinct_id,
  groups = {},
  person_properties = {},
  group_properties = {},
  only_evaluate_locally = false,
  raise_on_error = false
)
  # TODO: Convert to options hash for easier argument passing
  flags_data = get_all_flags_and_payloads(
    distinct_id,
    groups,
    person_properties,
    group_properties,
    only_evaluate_locally,
    raise_on_error
  )

  if flags_data.key?(:featureFlags)
    stringify_keys(flags_data[:featureFlags] || {})
  else
    logger.debug "Missing feature flags key: #{flags_data.to_json}"
    {}
  end
end

#get_flags(distinct_id, groups = {}, person_properties = {}, group_properties = {}, flag_keys = nil, disable_geoip = nil) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
 
# File 'lib/posthog/feature_flags.rb', line 136

def get_flags(distinct_id, groups = {}, person_properties = {}, group_properties = {}, flag_keys = nil,
              disable_geoip = nil)
  flag_keys = flag_keys.map(&:to_s) if flag_keys.is_a?(Array)
  request_data = {
    distinct_id: distinct_id,
    groups: groups,
    person_properties: person_properties,
    group_properties: group_properties
  }
  request_data[:flag_keys_to_evaluate] = flag_keys if flag_keys && !flag_keys.empty?
  request_data[:geoip_disable] = true if disable_geoip

  flags_response = _request_feature_flag_evaluation(request_data)

  # Only normalize if we have flags in the response
  if flags_response[:flags]
    # v4 format
    flags_hash = flags_response[:flags].transform_values do |flag|
      FeatureFlag.new(flag)
    end
    flags_response[:flags] = flags_hash
    # Filter out flags that failed evaluation to avoid overwriting cached values
    successful_flags = flags_hash.reject { |_, flag| flag.failed == true }
    flags_response[:featureFlags] = successful_flags.transform_values(&:get_value).transform_keys(&:to_sym)
    flags_response[:featureFlagPayloads] = successful_flags.transform_values(&:payload).transform_keys(&:to_sym)
  elsif flags_response[:featureFlags]
    # v3 format
    flags_response[:featureFlags] = flags_response[:featureFlags] || {}
    flags_response[:featureFlagPayloads] = flags_response[:featureFlagPayloads] || {}
    flags_response[:flags] = flags_response[:featureFlags].to_h do |key, value|
      [key, FeatureFlag.from_value_and_payload(key, value, flags_response[:featureFlagPayloads][key])]
    end
  end

  flags_response
end

#get_matching_variant(flag, distinct_id) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1063
1064
1065
1066
1067
1068
1069
 
# File 'lib/posthog/feature_flags.rb', line 1063

def get_matching_variant(flag, distinct_id)
  hash_value = _hash(flag[:key], distinct_id, 'variant')
  matching_variant = variant_lookup_table(flag).find do |variant|
    hash_value >= variant[:value_min] and hash_value < variant[:value_max]
  end
  matching_variant.nil? ? nil : matching_variant[:key]
end

#get_remote_config_payload(flag_key) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



173
174
175
 
# File 'lib/posthog/feature_flags.rb', line 173

def get_remote_config_payload(flag_key)
  _request_remote_config_payload(flag_key.to_s)
end

#load_feature_flags(force_reload = false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



80
81
82
83
84
 
# File 'lib/posthog/feature_flags.rb', line 80

def load_feature_flags(force_reload = false)
  return unless @loaded_flags_successfully_once.false? || force_reload

  _load_feature_flags
end

#match_feature_flag_properties(flag, distinct_id, properties, evaluation_cache, cohort_properties = {}, groups: {}, group_properties: {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
 
# File 'lib/posthog/feature_flags.rb', line 958

def match_feature_flag_properties(flag, distinct_id, properties, evaluation_cache, cohort_properties = {},
                                  groups: {}, group_properties: {})
  flag_filters = flag[:filters] || {}

  flag_conditions = flag_filters[:groups] || []
  flag_aggregation = flag_filters[:aggregation_group_type_index]
  is_inconclusive = false
  result = nil

  # NOTE: This NEEDS to be `each` because `each_key` breaks
  flag_conditions.each do |condition|
    # Per-condition aggregation overrides only when the condition explicitly
    # sets its own aggregation_group_type_index (mixed targeting). When absent,
    # use the properties/bucketing already resolved by the caller.
    condition_aggregation = condition.fetch(:aggregation_group_type_index, flag_aggregation)

    effective_properties = properties
    effective_bucketing = distinct_id

    # Mixed-override path: condition-level aggregation differs from flag-level.
    # This assumes flag-level aggregation is nil for mixed flags.
    if condition_aggregation != flag_aggregation
      if condition_aggregation.nil?
        # Person condition under a mixed flag — caller already passed person props/bucketing.
      else
        group_name = @group_type_mapping[condition_aggregation.to_s.to_sym]
        if group_name.nil? || !groups.key?(group_name.to_sym)
          logger.debug do
            "[FEATURE FLAGS] Skipping group condition for flag '#{flag[:key]}': " \
              "group type index #{condition_aggregation} not available"
          end
          next
        end
        unless group_properties.key?(group_name.to_sym)
          is_inconclusive = true
          next
        end
        effective_properties = group_properties[group_name.to_sym]
        effective_bucketing = groups[group_name.to_sym]
      end
    end

    if condition_match(flag, effective_bucketing, condition, effective_properties, evaluation_cache,
                       cohort_properties)
      variant_override = condition[:variant]
      flag_multivariate = flag_filters[:multivariate] || {}
      flag_variants = flag_multivariate[:variants] || []
      variant = if flag_variants.map { |variant| variant[:key] }.include?(condition[:variant])
                  variant_override
                else
                  get_matching_variant(flag, effective_bucketing)
                end
      result = variant || true
      break
    end
  rescue RequiresServerEvaluation
    # Static cohort or other missing server-side data - must fallback to API
    raise
  rescue InconclusiveMatchError
    # Evaluation error (bad regex, invalid date, missing property, etc.)
    # Track that we had an inconclusive match, but try other conditions
    is_inconclusive = true
  end

  if !result.nil?
    return result
  elsif is_inconclusive
    raise InconclusiveMatchError, "Can't determine if feature flag is enabled or not with given properties"
  end

  # We can only return False when all conditions are False
  false
end

#shutdown_poller ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



400
401
402
403
404
405
406
407
408
409
 
# File 'lib/posthog/feature_flags.rb', line 400

def shutdown_poller
  @task.shutdown
  return unless @flag_definition_cache_provider

  begin
    @flag_definition_cache_provider.shutdown
  rescue StandardError => e
    logger.error("[FEATURE FLAGS] Cache provider shutdown error: #{e}")
  end
end

#variant_lookup_table(flag) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
 
# File 'lib/posthog/feature_flags.rb', line 1071

def variant_lookup_table(flag)
  lookup_table = []
  value_min = 0
  flag_filters = flag[:filters] || {}
  variants = flag_filters[:multivariate] || {}
  multivariates = variants[:variants] || []
  multivariates.each do |variant|
    value_max = value_min + (variant[:rollout_percentage].to_f / 100)
    lookup_table << { value_min: value_min, value_max: value_max, key: variant[:key] }
    value_min = value_max
  end
  lookup_table
end