Class: LanguageOperator::Agent::WebServer

Inherits:
Object
  • Object
show all
Defined in:
lib/language_operator/agent/web_server.rb

Overview

Web Server for Reactive Agents

Enables agents to receive HTTP requests (webhooks, API calls) and respond to them. Agents in :reactive mode run an HTTP server that listens for incoming requests and triggers agent execution.

Examples:

Starting a web server for an agent

server = LanguageOperator::Agent::WebServer.new(agent)
server.start

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(agent, port: nil) ⇒ WebServer

Initialize the web server

Parameters:



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# File 'lib/language_operator/agent/web_server.rb', line 29

def initialize(agent, port: nil)
  @agent = agent
  @port = port || ENV.fetch('PORT', '8080').to_i
  @routes = {}
  @mcp_server = nil
  @mcp_transport = nil
  @execution_state = nil # Initialized when register_execute_endpoint called

  # Initialize executor pool to prevent MCP connection leaks
  @executor_pool_size = ENV.fetch('EXECUTOR_POOL_SIZE', '4').to_i
  @executor_pool = setup_executor_pool

  setup_default_routes
end

Instance Attribute Details

#agent ⇒ Object (readonly)

Returns the value of attribute agent.



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# File 'lib/language_operator/agent/web_server.rb', line 23

def agent
  @agent
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/language_operator/agent/web_server.rb', line 23

def port
  @port
end

Instance Method Details

#add_directory_to_tar(tar, source_path, archive_path) ⇒ Object

Add directory to tar archive recursively



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# File 'lib/language_operator/agent/web_server.rb', line 499

def add_directory_to_tar(tar, source_path, archive_path)
  Dir.entries(source_path).each do |entry|
    next if entry.start_with?('.')
    
    full_path = File.join(source_path, entry)
    tar_path = File.join(archive_path, entry)
    
    if File.directory?(full_path)
      tar.mkdir(tar_path, 0755)
      add_directory_to_tar(tar, full_path, tar_path)
    else
      tar.add_file(tar_path, 0644) do |io|
        io.write(File.binread(full_path))
      end
    end
  end
end

#cleanup ⇒ void

This method returns an undefined value.

Cleanup executor pool and connections

Properly closes all executors in the pool and their MCP connections to prevent resource leaks during server shutdown.



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# File 'lib/language_operator/agent/web_server.rb', line 557

def cleanup
  return unless @executor_pool

  # Drain and cleanup all executors in the pool
  executors_cleaned = 0

  until @executor_pool.empty?
    executor = @executor_pool.pop unless @executor_pool.empty?
    if executor
      executor.cleanup_connections
      executors_cleaned += 1
    end
  end

  puts "Cleaned up #{executors_cleaned} executors from pool"
end

#get_file_info(full_path, requested_path) ⇒ Object

Get file information



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# File 'lib/language_operator/agent/web_server.rb', line 455

def get_file_info(full_path, requested_path)
  {
    status: 200,
    body: {
      path: requested_path,
      size: File.size(full_path),
      type: 'file'
    },
    headers: { 'Content-Type' => 'application/json' }
  }
end

#handle_request(env) ⇒ Array

Handle incoming HTTP request

Parameters:

  • env (Hash) —

    Rack environment

Returns:

  • (Array) —

    Rack response [status, headers, body]



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# File 'lib/language_operator/agent/web_server.rb', line 533

def handle_request(env)
  request = Rack::Request.new(env)
  path = request.path
  method = request.request_method.downcase.to_sym

  # Try to find a matching route
  route_key = normalize_route_key(path, method)
  route_config = @routes[route_key]

  if route_config
    execute_handler(route_config, request)
  else
    not_found_response(path, method)
  end
rescue StandardError => e
  error_response(e)
end

#handle_workspace_delete(context) ⇒ Object

Handle DELETE /api/v1/workspace/files - delete file



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# File 'lib/language_operator/agent/web_server.rb', line 326

def handle_workspace_delete(context)
  request = context[:request]
  path = request.params['path']

  return workspace_error_response(400, 'BadRequest', 'path parameter required') unless path

  # Sanitize path to prevent directory traversal
  safe_path = sanitize_workspace_path(path)
  full_path = File.join(@workspace_path, safe_path)

  return workspace_error_response(404, 'NotFound', "File not found: #{path}") unless File.exist?(full_path)

  # Delete file or directory
  if File.directory?(full_path)
    FileUtils.rm_rf(full_path)
  else
    File.delete(full_path)
  end

  {
    status: 200,
    body: {
      message: 'File deleted successfully',
      path: path
    },
    headers: { 'Content-Type' => 'application/json' }
  }
rescue StandardError => e
  workspace_error_response(500, 'DeleteError', "Deletion failed: #{e.message}")
end

#handle_workspace_download(context) ⇒ Object

Handle GET /api/v1/workspace/files/download - download file or directory as tar.gz



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# File 'lib/language_operator/agent/web_server.rb', line 358

def handle_workspace_download(context)
  request = context[:request]
  path = request.params['path']

  return workspace_error_response(400, 'BadRequest', 'path parameter required') unless path

  # Sanitize path to prevent directory traversal
  safe_path = sanitize_workspace_path(path)
  full_path = File.join(@workspace_path, safe_path)

  return workspace_error_response(404, 'NotFound', "Path not found: #{path}") unless File.exist?(full_path)

  if File.file?(full_path)
    # Single file download
    content = File.binread(full_path)
    filename = File.basename(full_path)
    
    {
      status: 200,
      body: content,
      headers: {
        'Content-Type' => 'application/octet-stream',
        'Content-Disposition' => "attachment; filename=\"#{filename}\""
      }
    }
  else
    # Directory download as tar.gz
    require 'tempfile'
    require 'zlib'
    require 'rubygems/package'

    Tempfile.create(['workspace', '.tar.gz']) do |temp_file|
      Zlib::GzipWriter.open(temp_file.path) do |gz|
        Gem::Package::TarWriter.new(gz) do |tar|
          add_directory_to_tar(tar, full_path, safe_path)
        end
      end

      content = File.binread(temp_file.path)
      filename = "#{File.basename(path)}.tar.gz"

      {
        status: 200,
        body: content,
        headers: {
          'Content-Type' => 'application/gzip',
          'Content-Disposition' => "attachment; filename=\"#{filename}\""
        }
      }
    end
  end
rescue StandardError => e
  workspace_error_response(500, 'DownloadError', "Download failed: #{e.message}")
end

#handle_workspace_list(context) ⇒ Object

Handle GET /api/v1/workspace/files - list directory contents



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# File 'lib/language_operator/agent/web_server.rb', line 221

def handle_workspace_list(context)
  request = context[:request]
  path = request.params['path'] || '/'

  # Sanitize path to prevent directory traversal
  safe_path = sanitize_workspace_path(path)
  full_path = File.join(@workspace_path, safe_path)

  return workspace_error_response(404, 'NotFound', "Path not found: #{path}") unless File.exist?(full_path)

  if File.directory?(full_path)
    list_directory_contents(full_path, path)
  else
    # If it's a file, return file info
    get_file_info(full_path, path)
  end
rescue StandardError => e
  workspace_error_response(500, 'InternalError', e.message)
end

#handle_workspace_upload(context) ⇒ Object

Handle POST /api/v1/workspace/files - upload file



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# File 'lib/language_operator/agent/web_server.rb', line 277

def handle_workspace_upload(context)
  request = context[:request]
  
  # Parse multipart form data
  if request.content_type&.start_with?('multipart/form-data')
    boundary = request.content_type.split('boundary=')[1]
    return workspace_error_response(400, 'BadRequest', 'Missing boundary in multipart data') unless boundary

    # Parse the multipart data
    body = request.body.read
    parts = parse_multipart(body, boundary)
    
    file_part = parts.find { |part| part[:name] == 'file' }
    path_param = parts.find { |part| part[:name] == 'path' }&.dig(:content)
    
    return workspace_error_response(400, 'BadRequest', 'file parameter required') unless file_part
    return workspace_error_response(400, 'BadRequest', 'path parameter required') unless path_param

    # Sanitize path to prevent directory traversal
    safe_path = sanitize_workspace_path(path_param)
    full_path = File.join(@workspace_path, safe_path)

    # Check file size (limit to 100MB)
    content = file_part[:content]
    return workspace_error_response(413, 'FileTooLarge', 'File too large (max 100MB)') if content.bytesize > 100 * 1024 * 1024

    # Create directory if it doesn't exist
    FileUtils.mkdir_p(File.dirname(full_path))

    # Write file
    File.binwrite(full_path, content)

    {
      status: 201,
      body: {
        message: 'File uploaded successfully',
        path: path_param,
        size: content.bytesize
      },
      headers: { 'Content-Type' => 'application/json' }
    }
  else
    workspace_error_response(400, 'BadRequest', 'Expected multipart/form-data')
  end
rescue StandardError => e
  workspace_error_response(500, 'UploadError', "Upload failed: #{e.message}")
end

#handle_workspace_view(context) ⇒ Object

Handle GET /api/v1/workspace/files/view - view file contents



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# File 'lib/language_operator/agent/web_server.rb', line 242

def handle_workspace_view(context)
  request = context[:request]
  path = request.params['path']

  return workspace_error_response(400, 'BadRequest', 'path parameter required') unless path

  # Sanitize path to prevent directory traversal
  safe_path = sanitize_workspace_path(path)
  full_path = File.join(@workspace_path, safe_path)

  return workspace_error_response(404, 'NotFound', "File not found: #{path}") unless File.exist?(full_path)

  return workspace_error_response(400, 'BadRequest', "Path is not a file: #{path}") unless File.file?(full_path)

  # Check file size (limit to 10MB for API responses)
  file_size = File.size(full_path)
  return workspace_error_response(413, 'FileTooLarge', 'File too large for viewing (max 10MB)') if file_size > 10 * 1024 * 1024

  # Read file contents
  contents = File.read(full_path)

  {
    status: 200,
    body: {
      path: path,
      size: file_size,
      contents: contents
    },
    headers: { 'Content-Type' => 'application/json' }
  }
rescue StandardError => e
  workspace_error_response(500, 'InternalError', e.message)
end

#list_directory_contents(full_path, requested_path) ⇒ Object

List directory contents



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# File 'lib/language_operator/agent/web_server.rb', line 431

def list_directory_contents(full_path, requested_path)
  entries = Dir.entries(full_path).reject { |entry| entry.start_with?('.') }

  files = entries.map do |entry|
    entry_path = File.join(full_path, entry)
    {
      name: entry,
      type: File.directory?(entry_path) ? 'directory' : 'file',
      size: File.file?(entry_path) ? File.size(entry_path) : nil,
      path: File.join(requested_path, entry).sub(%r{^/+}, '')
    }
  end

  {
    status: 200,
    body: {
      path: requested_path,
      files: files
    },
    headers: { 'Content-Type' => 'application/json' }
  }
end

#parse_multipart(body, boundary) ⇒ Object

Parse multipart form data



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# File 'lib/language_operator/agent/web_server.rb', line 468

def parse_multipart(body, boundary)
  parts = []
  boundary = "--#{boundary}"
  sections = body.split(boundary)
  
  sections[1..-2]&.each do |section|
    next if section.strip.empty?
    
    lines = section.split("\r\n")
    content_disposition = lines.find { |line| line.include?('Content-Disposition') }
    next unless content_disposition
    
    name_match = content_disposition.match(/name="([^"]+)"/)
    next unless name_match
    
    name = name_match[1]
    
    # Find empty line separating headers from content
    content_start = lines.index('') 
    next unless content_start
    
    content = lines[(content_start + 1)..-1].join("\r\n")
    content = content[0..-3] if content.end_with?("\r\n") # Remove trailing CRLF
    
    parts << { name: name, content: content }
  end
  
  parts
end

#register_chat_endpoint(agent) ⇒ void

This method returns an undefined value.

Register chat completion endpoint

Sets up OpenAI-compatible chat completion endpoint for all agents. Every agent automatically gets identity-aware chat capabilities.

Parameters:



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# File 'lib/language_operator/agent/web_server.rb', line 122

def register_chat_endpoint(agent)
  @chat_agent = agent

  # Create simple chat configuration (identity awareness always enabled)
  @chat_config = {
    model_name: ENV.fetch('AGENT_NAME', agent.config&.dig('agent', 'name') || 'agent'),
    system_prompt: build_default_system_prompt(agent),
    temperature: 0.7,
    max_tokens: 2000
  }

  # Register OpenAI-compatible endpoint
  register_route('/v1/chat/completions', method: :post) do |context|
    handle_chat_completion(context)
  end

  # Also register models endpoint for compatibility
  register_route('/v1/models', method: :get) do |_context|
    {
      object: 'list',
      data: [
        {
          id: @chat_config[:model_name],
          object: 'model',
          created: Time.now.to_i,
          owned_by: 'language-operator',
          permission: [],
          root: @chat_config[:model_name],
          parent: nil
        }
      ]
    }
  end

  puts "Registered identity-aware chat endpoint as model: #{@chat_config[:model_name]}"
end

#register_execute_endpoint(agent, agent_def = nil) ⇒ void

This method returns an undefined value.

Register execution trigger endpoint

Enables scheduled/reactive agents to execute tasks via HTTP POST. Prevents concurrent executions via ExecutionState.

Parameters:



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# File 'lib/language_operator/agent/web_server.rb', line 167

def register_execute_endpoint(agent, agent_def = nil)
  require_relative 'execution_state'

  @execute_agent = agent
  @execute_agent_def = agent_def
  @execution_state = LanguageOperator::Agent::ExecutionState.new

  register_route('/api/v1/execute', method: :post) do |context|
    handle_execute_request(context)
  end

  puts 'Registered /api/v1/execute endpoint for triggered execution'
end

#register_mcp_tools(mcp_server_def) ⇒ void

This method returns an undefined value.

Register MCP tools

Sets up MCP protocol endpoints for tool discovery and execution. Tools defined in the agent will be exposed via MCP protocol.

Parameters:



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# File 'lib/language_operator/agent/web_server.rb', line 88

def register_mcp_tools(mcp_server_def)
  require_relative '../dsl/adapter'

  # Convert tool definitions to MCP::Tool classes
  mcp_tools = mcp_server_def.all_tools.map do |tool_def|
    Dsl::Adapter.tool_definition_to_mcp_tool(tool_def)
  end

  # Create MCP server
  @mcp_server = MCP::Server.new(
    name: mcp_server_def.server_name,
    version: LanguageOperator::VERSION,
    tools: mcp_tools
  )

  # Create the Streamable HTTP transport
  @mcp_transport = MCP::Server::Transports::StreamableHTTPTransport.new(@mcp_server)
  @mcp_server.transport = @mcp_transport

  # Register MCP endpoint
  register_route('/mcp', method: :post) do |context|
    handle_mcp_request(context[:request])
  end

  puts "Registered #{mcp_tools.size} MCP tools"
end

#register_route(path, method: :post, authentication: nil, validations: nil, &handler) ⇒ void

This method returns an undefined value.

Register a webhook route

Parameters:

  • path (String) —

    The URL path

  • method (Symbol) (defaults to: :post) —

    HTTP method (:get, :post, :put, :delete, :patch)

  • authentication (LanguageOperator::Dsl::WebhookAuthentication, nil) (defaults to: nil) —

    Authentication configuration

  • validations (Array<Hash>, nil) (defaults to: nil) —

    Validation rules

  • handler (Proc) —

    Request handler block



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# File 'lib/language_operator/agent/web_server.rb', line 64

def register_route(path, method: :post, authentication: nil, validations: nil, &handler)
  @routes[normalize_route_key(path, method)] = {
    handler: handler,
    authentication: authentication,
    validations: validations || []
  }
end

#register_workspace_endpoints(agent) ⇒ Object

Register workspace file management endpoints

Parameters:



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# File 'lib/language_operator/agent/web_server.rb', line 184

def register_workspace_endpoints(agent)
  return unless agent.workspace_available?

  @workspace_agent = agent
  @workspace_path = agent.workspace_path

  # List directory contents
  register_route('/api/v1/workspace/files', method: :get) do |context|
    handle_workspace_list(context)
  end

  # View file contents
  register_route('/api/v1/workspace/files/view', method: :get) do |context|
    handle_workspace_view(context)
  end

  # Upload file
  register_route('/api/v1/workspace/files', method: :post) do |context|
    handle_workspace_upload(context)
  end

  # Delete file
  register_route('/api/v1/workspace/files', method: :delete) do |context|
    handle_workspace_delete(context)
  end

  # Download file/directory
  register_route('/api/v1/workspace/files/download', method: :get) do |context|
    handle_workspace_download(context)
  end

  puts 'Registered /api/v1/workspace/* endpoints for file management'
end

#route_exists?(path, method) ⇒ Boolean

Check if a route exists

Parameters:

  • path (String) —

    The URL path

  • method (Symbol) —

    HTTP method

Returns:

  • (Boolean) 


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# File 'lib/language_operator/agent/web_server.rb', line 77

def route_exists?(path, method)
  @routes.key?(normalize_route_key(path, method))
end

#sanitize_workspace_path(path) ⇒ Object

Sanitize workspace path to prevent directory traversal attacks



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# File 'lib/language_operator/agent/web_server.rb', line 416

def sanitize_workspace_path(path)
  # Remove leading slash and resolve relative paths
  clean_path = path.sub(%r{^/+}, '')

  # Resolve and normalize the path
  normalized = File.expand_path(clean_path, '/')

  # Ensure it doesn't escape the root
  return '' if normalized == '/' || !normalized.start_with?('/')

  # Remove leading slash for joining with workspace_path
  normalized[1..]
end

#start ⇒ void

This method returns an undefined value.

Start the HTTP server



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# File 'lib/language_operator/agent/web_server.rb', line 47

def start
  puts "Starting Agent HTTP server on http://0.0.0.0:#{@port}"
  puts "Agent: #{@agent.class.name}"
  puts 'Mode: reactive'

  # Start the server with Puma
  Rackup::Handler.get('puma').run(rack_app, Port: @port, Host: '0.0.0.0')
end

#workspace_error_response(status, error_type, message) ⇒ Object

Generate workspace error response



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# File 'lib/language_operator/agent/web_server.rb', line 518

def workspace_error_response(status, error_type, message)
  {
    status: status,
    body: {
      error: error_type,
      message: message
    },
    headers: { 'Content-Type' => 'application/json' }
  }
end