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 53

def check_override(tool_name)
  registry_override = check_registry_override(tool_name)
  return registry_override if registry_override

  check_settings_override(tool_name)
end

.check_registry_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 60

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: :debug, 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 76

def check_settings_override(tool_name)
  overrides = Legion::LLM::Settings.global_value(: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 14

def dispatch(tool_call:, source:, exchange_id: nil)
  start_time = Time.now
  log.debug "[llm][tools] 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
      overridden_source = source
      source = override.merge(overridden_from: overridden_source)
    end
  end

  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 :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
  log.debug "[llm][tools] action=dispatch.complete tool=#{tool_call[:name]} status=#{result[:status]} duration_ms=#{duration_ms}"
  result.merge(
    source:      source,
    exchange_id: exchange_id,
    duration_ms: duration_ms
  )
rescue StandardError => e
  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 }
end

.dispatch_builtin(_tool_call, _source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 133

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 123

def dispatch_client(tool_call, source)
  return { status: :error, result: "Tool #{tool_call[:name]} is not executable server-side." } unless source[:executable]

  require 'legion/llm/api/native/helpers'

  helper = Object.new.extend(Legion::LLM::API::Native::ClientToolMethods)
  result = helper.send(:dispatch_client_tool, tool_call[:name].to_s, **symbolize_keys(tool_call[:arguments] || {}))
  { status: :success, result: result }
end

.dispatch_extension(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 101

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

  runner = Kernel.const_get(runner_path)
  fn = source[:function].to_sym
  result = runner.send(fn, **(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 91

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 112

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

.extract_content(result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 151

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 165

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

.symbolize_keys(value) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 137

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