Module: Legion::LLM::Tools::Dispatcher

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/tools/dispatcher.rb

Class Method Summary collapse

Class Method Details

.check_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 69

def check_override(tool_name)
  settings_override = check_settings_override(tool_name)
  return settings_override if settings_override

  check_registry_override(tool_name)
end

.check_registry_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 76

def check_registry_override(tool_name)
  return nil unless Legion::Settings::Extensions.respond_to?(:find_tool)

  entry = Legion::Settings::Extensions.find_tool(tool_name)
  return nil unless entry

  if entry[:tool_class]
    { type: :registry, tool_class: entry[:tool_class] }
  elsif entry[:extension] && entry[:runner] && entry[:function]
    { type: :extension, lex: entry[:extension], runner: entry[:runner], function: entry[:function] }
  end
rescue StandardError => e
  handle_exception(e, level: :warn, operation: 'llm.tools.dispatcher.check_registry_override', tool_name: tool_name)
  nil
end

.check_settings_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 92

def check_settings_override(tool_name)
  overrides = Legion::Settings.dig(:mcp, :overrides)
  return nil unless overrides.is_a?(Hash)

  override = overrides[tool_name]
  return nil unless override

  {
    type:     :extension,
    lex:      override[:lex] || override['lex'],
    runner:   override[:runner] || override['runner'],
    function: override[:function] || override['function']
  }
end

.dispatch(tool_call:, source:, exchange_id: nil) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 15

def dispatch(tool_call:, source:, exchange_id: nil)
  start_time = Time.now
  log.debug "[llm][tools_dispatcher] action=dispatch.enter tool=#{tool_call[:name]} source_type=#{source[:type]} exchange_id=#{exchange_id}"

  if source[:type] == :mcp
    override = check_override(tool_call[:name])
    if override
      log.warn "[llm][tools_dispatcher] action=source_overridden tool=#{tool_call[:name]} from=mcp:#{source[:server]} to=#{override[:type]}"
      overridden_source = source
      source = override.merge(overridden_from: overridden_source)
    end
  end

  log.info "[llm][tools_dispatcher] action=dispatch_path tool=#{tool_call[:name]} path=#{source[:type]} exchange_id=#{exchange_id}"
  result = case source[:type]
           when :mcp
             dispatch_mcp(tool_call, source)
           when :extension
             dispatch_extension(tool_call, source)
           when :registry
             dispatch_registry(tool_call, source)
           when :client
             dispatch_client(tool_call, source)
           when :special
             dispatch_special(tool_call)
           when :builtin
             dispatch_builtin(tool_call, source)
           else
             { status: :error, error: "Unknown tool source type: #{source[:type]}" }
           end

  duration_ms = ((Time.now - start_time) * 1000).to_i
  if result[:status] == :error
    err_detail = error_log_detail(result)
    log.warn "[llm][tools_dispatcher] action=dispatch_failed tool=#{tool_call[:name]} " \
             "path=#{source[:type]} duration_ms=#{duration_ms} error=#{err_detail}"
  else
    log.info "[llm][tools_dispatcher] action=dispatch.complete tool=#{tool_call[:name]} " \
             "path=#{source[:type]} status=#{result[:status]} duration_ms=#{duration_ms}"
  end
  result.merge(
    source:      source,
    exchange_id: exchange_id,
    duration_ms: duration_ms
  )
rescue StandardError => e
  duration_ms = ((Time.now - start_time) * 1000).to_i
  err_detail = trim_error_detail("#{e.class}:#{e.message}")
  log.warn "[llm][tools_dispatcher] action=dispatch_exception tool=#{tool_call[:name]} " \
           "path=#{source&.[](:type)} duration_ms=#{duration_ms} error=#{err_detail}"
  handle_exception(e, level: :warn, operation: 'llm.tools.dispatcher.dispatch_tool_call', tool_name: tool_call[:name])
  { status: :error, error: e.message, source: source, exchange_id: exchange_id, duration_ms: duration_ms }
end

.dispatch_builtin(_tool_call, _source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 153

def dispatch_builtin(_tool_call, _source)
  { status: :passthrough, result: nil }
end

.dispatch_client(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 145

def dispatch_client(tool_call, source)
  { status: :passthrough, result: nil, client_tool: true, tool_name: tool_call[:name], source: source }
end

.dispatch_extension(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 117

def dispatch_extension(tool_call, source)
  lex = source[:lex] || source[:extension]
  log.debug "[llm][tools] action=dispatch_extension tool=#{tool_call[:name]} lex=#{lex} runner=#{source[:runner]}"
  segments = (lex || '').delete_prefix('lex-').split('-')
  runner_path = (%w[Legion Extensions] + segments.map(&:capitalize) + ['Runners', source[:runner]]).join('::')

  # Resolve from Object (top-level) with inherit=false: the runner path is
  # absolute (Legion::Extensions::...), so the first segment must resolve
  # against Object's own constants — Kernel.const_get(path, false) fails on
  # it because top-level constants live on Object, not Kernel. Keeping
  # inherit=false still refuses to resolve a runner via an ancestor chain.
  runner = Object.const_get(runner_path, false)
  fn = source[:function].to_sym
  result = runner.send(fn, **symbolize_keys(tool_call[:arguments] || {}))
  { status: :success, result: result }
end

.dispatch_mcp(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 107

def dispatch_mcp(tool_call, source)
  log.debug "[llm][tools] action=dispatch_mcp tool=#{tool_call[:name]} server=#{source[:server]}"
  conn = ::Legion::MCP::Client::Pool.connection_for(source[:server])
  raise "No connection for MCP server: #{source[:server]}" unless conn

  raw = conn.call_tool(name: tool_call[:name], arguments: tool_call[:arguments] || {})
  content = raw[:content]&.map { |c| c[:text] || c['text'] }&.join("\n")
  { status: raw[:error] ? :error : :success, result: content }
end

.dispatch_registry(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 134

def dispatch_registry(tool_call, source)
  log.debug "[llm][tools] action=dispatch_registry tool=#{tool_call[:name]}"
  tool_class = source[:tool_class]
  raise "No registry tool class for #{tool_call[:name]}" unless tool_class.respond_to?(:call)

  args = symbolize_keys(tool_call[:arguments] || {})
  args = Interceptor.intercept(tool_call[:name], **args)
  result = tool_class.call(**args)
  { status: result_error?(result) ? :error : :success, result: extract_content(result) }
end

.dispatch_special(tool_call) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 149

def dispatch_special(tool_call)
  Special.dispatch(tool_call[:name], **symbolize_keys(tool_call[:arguments] || {}))
end

.error_log_detail(result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 189

def error_log_detail(result)
  detail = structured_error_detail(result)
  detail = result_value(result, :error).to_s if detail.empty?
  detail = result_value(result, :result).to_s if detail.empty?
  trim_error_detail(detail)
end

.extract_content(result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 171

def extract_content(result)
  if result.respond_to?(:content) && result.content.is_a?(Array)
    result.content.filter_map { |c| c[:text] || c['text'] || c.to_s }.join("\n")
  elsif result.is_a?(Hash) && result[:content].is_a?(Array)
    result[:content].filter_map { |c| c[:text] || c['text'] }.join("\n")
  elsif result.is_a?(Hash)
    Legion::JSON.dump(result)
  elsif result.is_a?(String)
    result
  else
    result.to_s
  end
end

.result_error?(result) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/tools/dispatcher.rb', line 185

def result_error?(result)
  result.is_a?(Hash) && (result[:error] || result['error'])
end

.result_value(result, key) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 210

def result_value(result, key)
  return nil unless result.respond_to?(:[])

  result[key] || result[key.to_s]
end

.single_line(value) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 216

def single_line(value)
  value.to_s.gsub(/\s+/, ' ').strip
end

.structured_error_detail(result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 196

def structured_error_detail(result)
  fields = []
  exit_status = result_value(result, :exit_status)
  error = result_value(result, :error)
  output_tail = result_value(result, :output_tail)
  command_preview = result_value(result, :command_preview)

  fields << "exit_status=#{exit_status}" unless exit_status.nil?
  fields << "error=#{single_line(error)}" unless error.to_s.empty?
  fields << "output_tail=#{single_line(output_tail)}" unless output_tail.to_s.empty?
  fields << "command_preview=#{single_line(command_preview)}" if fields.empty? && !command_preview.to_s.empty?
  fields.join(' ')
end

.symbolize_keys(value) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 157

def symbolize_keys(value)
  case value
  when Hash
    value.to_h do |key, nested|
      normalized_key = key.respond_to?(:to_sym) ? key.to_sym : key
      [normalized_key, symbolize_keys(nested)]
    end
  when Array
    value.map { |entry| symbolize_keys(entry) }
  else
    value
  end
end

.tool_error_log_chars ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 224

def tool_error_log_chars
  Legion::Settings[:llm][:tools][:error_log_chars]
end

.trim_error_detail(value) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 220

def trim_error_detail(value)
  value.to_s[0, tool_error_log_chars]
end