Module: Legion::LLM::Inference::Steps::TierAssigner

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/inference/steps/tier_assigner.rb

Constant Summary collapse

DEFAULT_MAPPINGS = 
[
  { pattern: 'gaia:tick:*', tier: :local, intent: { cost: :minimize } },
  { pattern: 'gaia:dream:*', tier: :local, intent: { cost: :minimize } },
  { pattern: 'system:guardrails', tier: :local, intent: { cost: :minimize, effort: :low } },
  { pattern: 'system:reflection', tier: :local, intent: { cost: :minimize, effort: :moderate } },
  { pattern: 'user:*', tier: :frontier, intent: { effort: :reasoning } }
].freeze

Class Method Summary collapse

Class Method Details

.assign(caller:, classification:, priority:, gaia_hint:, existing_tier:) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 22

def assign(caller:, classification:, priority:, gaia_hint:, existing_tier:, **)
  # Privacy classifications are hard routing constraints. They must
  # override caller-supplied tier/intent and advisory signals.
  if privacy_constrained?(classification)
    log.info('[llm][routing] tier_assigned source=classification tier=local forced=true')
    return { tier: :local, intent: { privacy: :strict }, source: :classification, forced: true }
  end

  if existing_tier
    log.debug("[llm][routing] tier_preserved tier=#{existing_tier}")
    return nil
  end

  # 1. GAIA routing hint
  recommended = nested_value(gaia_hint, :data, :tier)
  if recommended.nil? && nested_value(gaia_hint, :data, :recommended_tier)
    log.warn('[llm][routing] gaia_hint uses deprecated :recommended_tier; GAIA advisory should emit :tier')
    recommended = nested_value(gaia_hint, :data, :recommended_tier)
  end

  if recommended
    log.info("[llm][routing] tier_assigned source=gaia tier=#{recommended}")
    return { tier: recommended.to_sym, source: :gaia }
  end

  # 2. Settings-driven role mappings
  mapping = find_role_mapping(caller)
  return mapping if mapping

  # 3. Priority-driven
  case priority&.to_sym
  when :critical, :high
    log.info("[llm][routing] tier_assigned source=priority tier=frontier priority=#{priority}")
    { tier: :frontier, intent: { effort: :reasoning }, source: :priority }
  when :low, :background
    log.info("[llm][routing] tier_assigned source=priority tier=local priority=#{priority}")
    { tier: :local, intent: { cost: :minimize }, source: :priority }
  else
    log.debug(
      '[llm][steps][tier_assigner] action=no_assignment ' \
      "caller=#{caller&.dig(:requested_by, :identity) || 'none'} priority=#{priority || 'none'}"
    )
    nil
  end
end

.find_role_mapping(caller) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 76

def find_role_mapping(caller)
  identity = nested_value(caller, :requested_by, :identity)
  return nil unless identity

  identity = identity.to_s
  tier_mappings.each do |mapping|
    next unless File.fnmatch?(value(mapping, :pattern).to_s, identity)

    tier = value(mapping, :tier)
    log.info("[llm][routing] tier_mapping identity=#{identity} tier=#{tier}")
    # L7: the assignment carries tier + intent only. The former
    # gaia:* hard provider/model pins (llm.gaia.preferred_*) were a
    # second selection domain — a settings pin that bypassed the
    # router's hint-miss fallback and could reject all traffic from
    # an identity class when the pinned model had no published lane.
    # Routing choice is Router.next_lane's alone; a preference for a
    # gaia: identity belongs in routing affinities, not here.
    return { tier: tier&.to_sym, intent: value(mapping, :intent), source: :role_mapping }
  end
  nil
end

.nested_value(hash, *keys) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 112

def nested_value(hash, *keys)
  keys.reduce(hash) do |current, key|
    return nil unless current.respond_to?(:key?)

    value(current, key)
  end
end

.privacy_constrained?(classification) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 68

def privacy_constrained?(classification)
  return false unless classification

  value(classification, :contains_phi) ||
    value(classification, :contains_pii) ||
    value(classification, :level)&.to_sym == :restricted
end

.tier_mappings ⇒ Object 



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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 98

def tier_mappings
  configured = Legion::Settings[:llm][:routing][:tier_mappings]
  configured.nil? || configured.empty? ? DEFAULT_MAPPINGS : configured
end

.value(hash, key) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/tier_assigner.rb', line 103

def value(hash, key)
  return nil unless hash.respond_to?(:key?)

  string_key = key.to_s
  return hash[string_key] if hash.key?(string_key)

  hash[key] if hash.key?(key)
end