Module: Legion::LLM::API::Native::Chat

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/api/native/chat.rb

Constant Summary collapse

ASYNC_POOL = 
Concurrent::FixedThreadPool.new(
  [4, (Concurrent.processor_count / 2)].max,
  fallback_policy: :caller_runs
)

Class Method Summary collapse

Class Method Details

.registered(app) ⇒ Object

rubocop:disable Metrics/MethodLength,Metrics/AbcSize



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# File 'lib/legion/llm/api/native/chat.rb', line 19

def self.registered(app) # rubocop:disable Metrics/MethodLength,Metrics/AbcSize
  log.debug('[llm][api][chat] registering POST /api/llm/chat')

  app.post '/api/llm/chat' do # rubocop:disable Metrics/BlockLength
    log.debug("[llm][api][chat] action=received params=#{params.keys}")
    require_llm!

    body = parse_request_body
    validate_required!(body, :message)

    message = body[:message]

    if defined?(Legion::MCP::TierRouter)
      log.debug('[llm][api][chat] action=tier_routing_check')
      tier_result = Legion::MCP::TierRouter.route(
        intent:  message,
        params:  body.except(:message, :model, :provider, :request_id),
        context: {}
      )
      if tier_result[:tier]&.zero?
        log.info("[llm][api][chat] action=tier0_response request_id=#{body[:request_id] || 'generated'} latency_ms=#{tier_result[:latency_ms]}")
        halt json_response({
                             response:           tier_result[:response],
                             tier:               0,
                             latency_ms:         tier_result[:latency_ms],
                             pattern_confidence: tier_result[:pattern_confidence]
                           })
      end
    end

    request_id = body[:request_id] || SecureRandom.uuid
    model      = body[:model]
    provider   = body[:provider]
    log.debug("[llm][api][chat] action=dispatch request_id=#{request_id} model=#{model || 'auto'} provider=#{provider || 'auto'}")

    if cache_available? && env['HTTP_X_LEGION_SYNC'] != 'true'
      log.debug("[llm][api][chat] action=async_dispatch request_id=#{request_id}")
      llm = Legion::LLM
      rc  = Legion::LLM::Cache::Response
      rc.init_request(request_id)

      Chat::ASYNC_POOL.post do
        session  = llm.chat_direct(model: model, provider: provider)
        response = session.ask(message)
        rc.complete(
          request_id,
          response: response.content,
          meta:     {
            model:      session.model.to_s,
            tokens_in:  response.respond_to?(:input_tokens) ? response.input_tokens : nil,
            tokens_out: response.respond_to?(:output_tokens) ? response.output_tokens : nil
          }
        )
        log.debug("[llm][api][chat] action=async_complete request_id=#{request_id}")
      rescue StandardError => e
        handle_exception(e, level: :error, handled: true, operation: 'llm.api.chat.async', request_id: request_id)
        rc.fail_request(request_id, code: 'llm_error', message: e.message)
      end

      log.info("[llm][api][chat] action=queued request_id=#{request_id}")
      json_response({ request_id: request_id, poll_key: "llm:#{request_id}:status" },
                    status_code: 202)
    else
      log.debug("[llm][api][chat] action=sync_dispatch request_id=#{request_id}")
      result = Legion::LLM.chat(message: message, model: model, provider: provider,
                                caller: { source: 'api', path: request.path })
      if result.is_a?(Legion::LLM::Inference::Response)
        raw_msg  = result.message
        content  = raw_msg.is_a?(Hash) ? (raw_msg[:content] || raw_msg['content']) : raw_msg.to_s
        routing  = result.routing || {}
        resolved_model = routing[:model] || routing['model']
        tokens = result.tokens || {}
        log.info("[llm][api][chat] action=completed request_id=#{request_id} model=#{resolved_model}")
        json_response(
          {
            response: content,
            meta:     {
              model:      resolved_model.to_s,
              tokens_in:  token_value(tokens, :input),
              tokens_out: token_value(tokens, :output)
            }
          },
          status_code: 201
        )
      else
        response = result
        log.info("[llm][api][chat] action=completed request_id=#{request_id} result_class=#{response.class}")
        json_response(
          {
            response: response.respond_to?(:content) ? response.content : response.to_s,
            meta:     {
              model:      response.respond_to?(:model_id) ? response.model_id.to_s : model.to_s,
              tokens_in:  response.respond_to?(:input_tokens) ? response.input_tokens : nil,
              tokens_out: response.respond_to?(:output_tokens) ? response.output_tokens : nil
            }
          },
          status_code: 201
        )
      end
    end
  end

  log.debug('[llm][api][chat] POST /api/llm/chat registered')
end