Module: Legion::LLM::Inference::Steps::TriggerMatch

Includes:
Logging, Legion::Logging::Helper
Included in:
Executor
Defined in:
lib/legion/llm/inference/steps/trigger_match.rb

Constant Summary collapse

HARNESS_PREFIXES = 
[
  '[SUGGESTION MODE',
  '[REQUEST INTERRUPTED',
  'Write the title in the predominant language'
].freeze

Instance Method Summary collapse

Instance Method Details

#extract_recent_text ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 79

def extract_recent_text
  depth = trigger_scan_depth
  messages = @request.messages.last(depth)

  text = messages.filter_map do |msg|
    next unless msg.is_a?(Hash)
    next unless (msg[:role] || msg['role']).to_s == 'user'

    content = msg[:content] || msg['content']
    raw = if content.is_a?(Array)
            content.filter_map do |c|
              if c.is_a?(String)
                c
              else
                (c.is_a?(Hash) ? (c[:text] || c['text']) : nil)
              end
            end.join(' ')
          else
            content.to_s
          end
    next if harness_message?(raw)

    raw
  end.join(' ')

  sanitize_trigger_text(text)
end

#extract_session_text(text) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 125

def extract_session_text(text)
  matches = text.to_s.scan(%r{<session\b[^>]*>(.*?)</session>}mi).flatten
  return nil if matches.empty?

  matches.join(' ')
end

#format_trigger_log_value(value) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 233

def format_trigger_log_value(value)
  case value
  when Array
    value.map(&:to_s).first(20).join(',')
  else
    value
  end
end

#harness_message?(text) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 118

def harness_message?(text)
  return false if text.nil? || text.empty?

  trimmed = text.lstrip
  HARNESS_PREFIXES.any? { |prefix| trimmed.start_with?(prefix) }
end

#log_trigger_match(action, **fields) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 223

def log_trigger_match(action, **fields)
  payload = fields.map { |key, value| "#{key}=#{format_trigger_log_value(value)}" }.join(' ')
  log.info(
    "[llm][tools][trigger] action=#{action} request_id=#{@request.id} " \
    "conversation_id=#{@request.conversation_id || 'none'} #{payload}".strip
  )
rescue StandardError => e
  handle_exception(e, level: :warn, handled: true, operation: 'llm.pipeline.steps.trigger_match.log')
end

#normalize_message_words(text) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 132

def normalize_message_words(text)
  return Set.new if text.nil? || text.empty?

  text.downcase.gsub(/[^a-z ]/, ' ').split.to_set
end

#rank_and_cap(matched, per_word, limit) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 176

def rank_and_cap(matched, per_word, limit)
  scores = Hash.new(0)
  per_word.each_value do |tools|
    tools.each { |tool| scores[tool] += 1 }
  end
  matched.to_a
         .sort_by { |tool| [-scores[tool], trigger_tool_name(tool)] }
         .first(limit)
end

#record_trigger_match_timeline(count, start_time = nil) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 242

def record_trigger_match_timeline(count, start_time = nil)
  return unless @timeline.respond_to?(:record)

  duration = start_time ? ((::Time.now - start_time) * 1000).to_i : 0
  @timeline.record(
    category: :enrichment, key: 'tool:trigger_match',
    direction: :inbound, detail: "#{count} tools matched via trigger words",
    from: 'settings_extensions', to: 'pipeline',
    duration_ms: duration
  )
end

#sanitize_trigger_text(text) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 107

def sanitize_trigger_text(text)
  session_text = extract_session_text(text)
  return session_text if session_text

  strip_tagged_blocks(text)
end

#settings_extension_tool_matches(word_set, extensions = settings_extensions) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 144

def settings_extension_tool_matches(word_set, extensions = settings_extensions)
  matched = Set.new
  per_word = Hash.new { |hash, word| hash[word] = Set.new }
  return [matched, per_word] unless extensions.respond_to?(:tools)

  Array(extensions.tools).each do |entry|
    next unless entry.is_a?(Hash)

    tool_words = trigger_words_for_entry(entry)
    matching_words = word_set & tool_words
    next if matching_words.empty?

    matched << entry
    matching_words.each { |word| per_word[word] << entry }
  end

  [matched, per_word]
end

#settings_extensions ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 138

def settings_extensions
  return unless defined?(Legion::Settings::Extensions)

  Legion::Settings::Extensions
end

#settings_value(*keys, default: nil) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 219

def settings_value(*keys, default: nil)
  Legion::Settings.dig(:llm, *keys) || default
end

#step_trigger_match ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 14

def step_trigger_match
  start_time = nil
  extensions = settings_extensions
  unless extensions.respond_to?(:tools)
    log_step_debug(:trigger_match, :skipped, reason: :settings_extensions_unavailable)
    log_trigger_match(:skipped, reason: :settings_extensions_unavailable)
    return
  end

  start_time = ::Time.now

  text = extract_recent_text
  word_set = normalize_message_words(text)
  if word_set.empty?
    log_step_debug(:trigger_match, :skipped, reason: :no_words)
    return
  end
  log_step_debug(:trigger_match, :scanning, word_count: word_set.size)

  matched, per_word = settings_extension_tool_matches(word_set, extensions)
  pre_filter_count = matched.size
  subtract_always_loaded(matched, extensions)
  if matched.empty?
    log_step_debug(:trigger_match, :no_matches)
    log_trigger_match(:no_matches, word_count: word_set.size, pre_filter_count: pre_filter_count)
    return
  end

  limit = trigger_tool_limit
  @triggered_tools = if matched.size <= limit
                       matched.to_a
                     else
                       log.warn(
                         "[llm][steps][trigger_match] action=tools_capped request_id=#{@request.id} " \
                         "matched=#{matched.size} limit=#{limit} dropped=#{matched.size - limit}"
                       )
                       rank_and_cap(matched, per_word, limit)
                     end

  names = @triggered_tools.map { |tool| trigger_tool_name(tool) }
  if @triggered_tools.any?
    @enrichments['tool:trigger_match'] = {
      content:   "#{@triggered_tools.size} tools matched via trigger words",
      data:      { tool_count: @triggered_tools.size, tool_names: names },
      timestamp: ::Time.now
    }
  end

  record_trigger_match_timeline(@triggered_tools.size, start_time)
  log_step_debug(:trigger_match, :matched, matched_count: matched.size, injected_count: @triggered_tools.size, limit: limit)
  log_trigger_match(:matched, word_count: word_set.size, matched_count: matched.size,
                              injected_count: @triggered_tools.size, limit: limit,
                              names: names)
rescue StandardError => e
  @warnings << "Trigger match error: #{e.message}"
  handle_exception(e, level: :warn, operation: 'llm.pipeline.steps.trigger_match')
  record_trigger_match_timeline(0, start_time)
end

#strip_tagged_blocks(text) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 114

def strip_tagged_blocks(text)
  text.to_s.gsub(%r{<[a-z][\w-]*\b[^>]*>.*?</[a-z][\w-]*>}mi, ' ')
end

#subtract_always_loaded(matched, extensions = settings_extensions) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 186

def subtract_always_loaded(matched, extensions = settings_extensions)
  unless extensions.respond_to?(:filter_tools)
    log_step_debug(:trigger_match, :always_loaded_filter_skipped, reason: :settings_extensions_unavailable)
    return
  end

  always = extensions.filter_tools(deferred: false).map { |t| t[:name] }
  matched.reject! { |tool| always.include?(trigger_tool_name(tool)) }
  log_step_debug(:trigger_match, :always_loaded_filtered, always_loaded_count: always.size, remaining_count: matched.size)
end

#tool_trigger_setting(key, default = nil) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 215

def tool_trigger_setting(key, default = nil)
  Legion::Settings.dig(:llm, :tool_trigger, key) || default
end

#trigger_scan_depth ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 207

def trigger_scan_depth
  tool_trigger_setting(:scan_depth, 10)
end

#trigger_tool_limit ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 211

def trigger_tool_limit
  tool_trigger_setting(:tool_limit, 25)
end

#trigger_tool_name(tool) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 197

def trigger_tool_name(tool)
  if tool.is_a?(Hash)
    (tool[:name] || tool['name']).to_s
  elsif tool.respond_to?(:tool_name)
    tool.tool_name.to_s
  else
    tool.to_s
  end
end

#trigger_tool_name_for_word_match(name) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 172

def trigger_tool_name_for_word_match(name)
  name.to_s.sub(/\Alegion[-_]/, '')
end

#trigger_words_for_entry(entry) ⇒ Object 



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# File 'lib/legion/llm/inference/steps/trigger_match.rb', line 163

def trigger_words_for_entry(entry)
  values = Array(entry[:trigger_words])
  values << trigger_tool_name_for_word_match(entry[:name])
  values << entry[:extension]
  values << entry[:runner]
  values << entry[:function]
  normalize_message_words(values.compact.join(' '))
end