Module: DebugAgent::MiddlewareCore

Defined in:
lib/debug_agent/middleware.rb

Overview

Shared routing logic used by both RackMiddleware class and Middleware lambda

Constant Summary collapse

CORS_HEADERS = 
{
  'Access-Control-Allow-Origin' => '*',
  'Access-Control-Allow-Methods' => 'GET, POST, OPTIONS',
  'Access-Control-Allow-Headers' => 'Content-Type, Authorization',
}.freeze

Class Method Summary collapse

Class Method Details

.call(env, app, engine, config) ⇒ Object 



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# File 'lib/debug_agent/middleware.rb', line 99

def self.call(env, app, engine, config)
  path = env['PATH_INFO']
  method = env['REQUEST_METHOD']
  base = config.base_path

  # CORS preflight for all agent routes
  if path.start_with?(base) && method == 'OPTIONS'
    return [204, CORS_HEADERS.merge('Content-Length' => '0'), []]
  end

  # Chat UI
  if path == base || path == "#{base}/"
    if method == 'GET'
      html = ChatPage.render(base)
      return [200, { 'Content-Type' => 'text/html; charset=utf-8' }.merge(CORS_HEADERS), [html]]
    end
  end

  # SSE streaming chat — real-time streaming via Rack response body
  if path == "#{base}/api/chat" && method == 'POST'
    body = JSON.parse(env['rack.input'].read)
    message = body['message'] || ''
    session_id = body['sessionId'] || "session-#{Time.now.to_i}"

    cb = SseCallback.new

    # Run engine in a background thread for real-time streaming
    Thread.new do
      begin
        engine.chat(message, session_id, cb)
      rescue => e
        cb.on_error("Internal error: #{e.message}")
      end
    end

    # Return a streaming response body (Rack 2+ / Rack 3 compatible)
    streaming_body = cb.streaming_enum

    return [200, {
      'Content-Type' => 'text/event-stream',
      'Cache-Control' => 'no-cache',
      'Connection' => 'keep-alive',
    }.merge(CORS_HEADERS), streaming_body]
  end

  # Clear conversation
  if path == "#{base}/api/clear" && method == 'POST'
    body = JSON.parse(env['rack.input'].read)
    session_id = body['sessionId'] || ''
    engine.clear_session(session_id) if session_id && !session_id.empty?
    return [200, { 'Content-Type' => 'application/json' }.merge(CORS_HEADERS), [JSON.generate({ status: 'cleared' })]]
  end

  # Health check
  if path == "#{base}/api/health" && method == 'GET'
    return [200, { 'Content-Type' => 'application/json' }.merge(CORS_HEADERS), [JSON.generate({ status: 'ok', agent: 'ruby-debug-agent' })]]
  end

  # List tools
  if path == "#{base}/api/tools" && method == 'GET'
    return [200, { 'Content-Type' => 'application/json' }.merge(CORS_HEADERS), [JSON.generate({ tools: engine.tools.all_schemas })]]
  end

  # Pass through to the wrapped app
  if app
    app.call(env)
  else
    [404, { 'Content-Type' => 'text/plain' }, ['Not Found']]
  end
end