Module: Legion::LLM::Fleet::Handler

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/fleet/handler.rb

Class Method Summary collapse

Class Method Details

.availability_method_for(payload) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 186

def availability_method_for(payload)
  case payload[:request_type]&.to_s
  when 'structured'
    :structured_direct
  when 'embed'
    :embed_direct
  else
    :chat_direct
  end
end

.build_response(correlation_id, response, message_context: {}) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 66

def build_response(correlation_id, response, message_context: {})
  log.debug "[llm][fleet][handler] action=build_response correlation_id=#{correlation_id}"
  model = extract_field(response, :model)
  {
    correlation_id:  correlation_id,
    success:         extract_success(response),
    error:           extract_error(response),
    response:        response,
    input_tokens:    extract_token(response, :input_tokens),
    output_tokens:   extract_token(response, :output_tokens),
    thinking_tokens: extract_token(response, :thinking_tokens),
    provider:        extract_field(response, :provider),
    model:           model,
    model_id:        model,
    message_context: optional_message_context(message_context)
  }.compact
end

.call_local_llm(payload) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 46

def call_local_llm(payload)
  log.debug "[llm][fleet][handler] action=call_local_llm request_type=#{payload[:request_type]} model=#{payload[:model]}"
  return unavailable_response unless llm_available_for?(payload)

  case payload[:request_type]&.to_s
  when 'structured'
    Legion::LLM.structured_direct(
      messages: payload[:messages],
      schema:   payload[:schema],
      model:    payload[:model],
      provider: payload[:provider]
    )
  when 'embed'
    text = payload[:text] || extract_terminal_content(payload[:messages])
    Legion::LLM.embed_direct(text, model: payload[:model], provider: payload[:provider])
  else
    execute_chat_request(payload)
  end
end

.execute_chat_request(payload) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 201

def execute_chat_request(payload)
  if payload[:message]
    return Legion::LLM.chat_direct(
      model:    payload[:model],
      provider: payload[:provider],
      intent:   payload[:intent],
      tier:     payload[:tier],
      message:  payload[:message]
    )
  end

  messages = normalize_messages(payload[:messages])
  prompt = extract_terminal_content(messages)
  return { success: false, error: 'invalid_request' } if prompt.nil?

  session = Legion::LLM.send(
    :chat_single,
    model:    payload[:model],
    provider: payload[:provider],
    intent:   payload[:intent],
    tier:     payload[:tier],
    tools:    payload[:tools]
  )
  session.with_instructions(payload[:system]) if payload[:system] && session.respond_to?(:with_instructions)

  prior_messages = messages.size > 1 ? messages[0..-2] : []
  prior_messages.each { |message| session.add_message(message) }

  session.ask(prompt)
end

.extract_error(response) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 261

def extract_error(response)
  return unless response.is_a?(Hash)

  response[:error] || response['error']
end

.extract_field(response, field) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 150

def extract_field(response, field)
  if response.is_a?(Hash)
    direct = response[field] || response[field.to_s]
    return direct unless direct.nil?

    meta = response[:meta] || response['meta']
    if meta.is_a?(Hash)
      meta_value = meta[field] || meta[field.to_s]
      return meta_value unless meta_value.nil?
    end

    routing = response[:routing] || response['routing']
    if routing.is_a?(Hash)
      routing_value = routing[field] || routing[field.to_s]
      return routing_value unless routing_value.nil?
    end

    return nil
  end

  if response.respond_to?(:routing) && response.routing.is_a?(Hash)
    routing_value = response.routing[field] || response.routing[field.to_s]
    return routing_value unless routing_value.nil?
  end

  return nil unless response.respond_to?(field)

  response.public_send(field)
end

.extract_success(response) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 253

def extract_success(response)
  return response[:success] if response.is_a?(Hash) && response.key?(:success)
  return response['success'] if response.is_a?(Hash) && response.key?('success')
  return false if extract_error(response)

  true
end

.extract_terminal_content(messages) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 242

def extract_terminal_content(messages)
  normalized = normalize_messages(messages)
  message_content(normalized.last)
end

.extract_token(response, field) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 109

def extract_token(response, field)
  return hash_token(response, field) if response.is_a?(Hash)

  if response.respond_to?(:tokens) && response.tokens.is_a?(Hash)
    token_key = { input_tokens: :input, output_tokens: :output, thinking_tokens: :thinking }[field]
    value = response.tokens[token_key] || response.tokens[token_key.to_s]
    return value.to_i if value
  end

  return 0 unless response.respond_to?(field)

  response.public_send(field).to_i
end

.fetch_option(hash, key) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 129

def fetch_option(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

.handle_fleet_request(payload) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 12

def handle_fleet_request(payload)
  payload = normalize_payload(payload)
  message_context = payload[:message_context] || {}
  log.debug '[llm][fleet][handler] action=handle_fleet_request.enter ' \
            "request_type=#{payload[:request_type]} model=#{payload[:model]} provider=#{payload[:provider]}"

  if Dispatcher.fleet_enabled? && !valid_token?(payload[:signed_token])
    error_response = { success: false, error: 'invalid_token',
                       message_context: optional_message_context(message_context) }.compact
    publish_reply(payload[:reply_to], payload[:correlation_id], error_response) if payload[:reply_to]
    return error_response
  end

  response = call_local_llm(payload)
  response_hash = build_response(payload[:correlation_id], response, message_context: message_context)
  publish_reply(payload[:reply_to], payload[:correlation_id], response_hash) if payload[:reply_to]
  response_hash
end

.hash_token(response, field) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 267

def hash_token(response, field)
  direct = response[field] || response[field.to_s]
  return direct.to_i if direct

  meta = response[:meta] || response['meta']
  if meta.is_a?(Hash)
    meta_key = { input_tokens: :tokens_in, output_tokens: :tokens_out, thinking_tokens: :thinking_tokens }[field]
    meta_value = meta[meta_key] || meta[meta_key.to_s]
    return meta_value.to_i if meta_value
  end

  tokens = response[:tokens] || response['tokens']
  if tokens.is_a?(Hash)
    token_key = { input_tokens: :input, output_tokens: :output, thinking_tokens: :thinking }[field]
    token_value = tokens[token_key] || tokens[token_key.to_s]
    return token_value.to_i if token_value
  end

  0
end

.llm_available_for?(payload) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/fleet/handler.rb', line 180

def llm_available_for?(payload)
  return false unless defined?(Legion::LLM)

  Legion::LLM.respond_to?(availability_method_for(payload), true)
end

.message_content(message) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 247

def message_content(message)
  return unless message.is_a?(Hash)

  message[:content] || message['content']
end

.nested_fetch(hash, *keys) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 138

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

    fetch_option(current, key)
  end
end

.normalize_messages(messages) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 232

def normalize_messages(messages)
  Array(messages).map do |message|
    next message unless message.is_a?(Hash)

    message.each_with_object({}) do |(key, value), normalized|
      normalized[key.respond_to?(:to_sym) ? key.to_sym : key] = value
    end
  end
end

.normalize_payload(payload) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 123

def normalize_payload(payload)
  return {} unless payload.is_a?(Hash)

  payload.transform_keys { |key| key.respond_to?(:to_sym) ? key.to_sym : key }
end

.optional_message_context(message_context) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 146

def optional_message_context(message_context)
  message_context.nil? || message_context.empty? ? nil : message_context
end

.publish_reply(reply_to, correlation_id, response_hash) ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 84

def publish_reply(reply_to, correlation_id, response_hash)
  return unless defined?(Legion::Transport)

  if defined?(Legion::LLM::Transport::Messages::FleetResponse)
    publish_result = Legion::LLM::Transport::Messages::FleetResponse.new(
      **response_hash, reply_to: reply_to, fleet_correlation_id: correlation_id
    ).publish
    log.warn("[llm][fleet][handler] action=reply_publish_failed correlation_id=#{correlation_id} status=#{publish_result[:status]}") if
      publish_result.is_a?(Hash) && publish_result[:accepted] == false
    return publish_result
  end

  payload = Legion::JSON.dump(response_hash)
  channel = Legion::Transport.connection.create_channel
  channel.default_exchange.publish(
    payload,
    routing_key:    reply_to,
    correlation_id: correlation_id,
    content_type:   'application/json'
  )
  channel.close
rescue StandardError => e
  handle_exception(e, level: :warn, operation: 'llm.fleet.handler.publish_reply')
end

.require_auth? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/fleet/handler.rb', line 42

def require_auth?
  Legion::LLM::Settings.value(:routing, :fleet, :require_auth) == true
end

.unavailable_response ⇒ Object 



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# File 'lib/legion/llm/fleet/handler.rb', line 197

def unavailable_response
  { success: false, error: 'llm_not_available' }
end

.valid_token?(token) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/fleet/handler.rb', line 31

def valid_token?(token)
  return true unless require_auth?
  return false if token.nil?
  return true unless defined?(Legion::Crypt)

  !Legion::Crypt.validate_jwt(token).nil?
rescue StandardError => e
  handle_exception(e, level: :debug, handled: true, operation: 'llm.fleet.handler.valid_token')
  false
end