Class: ZeroMcp::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/zeromcp/server.rb

Instance Method Summary collapse

Constructor Details

#initialize(config = nil, tools: nil) ⇒ Server

Returns a new instance of Server.



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# File 'lib/zeromcp/server.rb', line 17

def initialize(config = nil, tools: nil)
  @config = config || Config.load
  @scanner = Scanner.new(@config)
  @resource_scanner = ResourceScanner.new(@config)
  @prompt_scanner = PromptScanner.new(@config)
  @tools = tools || {}
  @resources = {}
  @templates = {}
  @prompts = {}
  @subscriptions = {}
  @log_level = 'info'
  @icon = tools ? Config.resolve_icon(@config.icon) : nil
  @credential_cache = {}
end

Instance Method Details

#handle_request(request) ⇒ Object

Process a single JSON-RPC request hash and return a response hash. Returns nil for notifications that require no response.

Note: tools must be loaded first via #serve or by calling load_tools manually if using this method directly for HTTP integration.

Usage:

response = server.handle_request({"jsonrpc" => "2.0", "id" => 1, "method" => "tools/list"})


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# File 'lib/zeromcp/server.rb', line 153

def handle_request(request)
  id = request['id']
  method = request['method']
  params = request['params'] || {}

  # Notifications (no id)
  if id.nil?
    handle_notification(method, params)
    return nil
  end

  case method
  when 'initialize'
    handle_initialize(id, params)
  when 'ping'
    { 'jsonrpc' => '2.0', 'id' => id, 'result' => {} }

  # Tools
  when 'tools/list'
    handle_tools_list(id, params)
  when 'tools/call'
    { 'jsonrpc' => '2.0', 'id' => id, 'result' => call_tool(params) }

  # Resources
  when 'resources/list'
    handle_resources_list(id, params)
  when 'resources/read'
    handle_resources_read(id, params)
  when 'resources/subscribe'
    handle_resources_subscribe(id, params)
  when 'resources/templates/list'
    handle_resources_templates_list(id, params)

  # Prompts
  when 'prompts/list'
    handle_prompts_list(id, params)
  when 'prompts/get'
    handle_prompts_get(id, params)

  # Passthrough
  when 'logging/setLevel'
    handle_logging_set_level(id, params)
  when 'completion/complete'
    handle_completion_complete(id, params)

  else
    {
      'jsonrpc' => '2.0',
      'id' => id,
      'error' => { 'code' => -32601, 'message' => "Method not found: #{method}" }
    }
  end
end

#load_tools ⇒ Object

Load tools (and resources/prompts) from the configured directories. Call this before using handle_request directly (serve calls this automatically).



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# File 'lib/zeromcp/server.rb', line 90

def load_tools
  @tools = @scanner.scan
  @resource_scanner.scan
  @resources = @resource_scanner.resources
  @templates = @resource_scanner.templates
  @prompt_scanner.scan
  @prompts = @prompt_scanner.prompts
  @icon = Config.resolve_icon(@config.icon)

  resource_count = @resources.size + @templates.size
  $stderr.puts "[zeromcp] #{@tools.size} tool(s), #{resource_count} resource(s), #{@prompts.size} prompt(s)"
end

#serve ⇒ Object 



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# File 'lib/zeromcp/server.rb', line 103

def serve
  $stdout.sync = true
  $stderr.sync = true
  $stdin.set_encoding('UTF-8')
  $stdout.set_encoding('UTF-8')

  @tools = @scanner.scan
  @resource_scanner.scan
  @resources = @resource_scanner.resources
  @templates = @resource_scanner.templates
  @prompt_scanner.scan
  @prompts = @prompt_scanner.prompts
  @icon = Config.resolve_icon(@config.icon)

  resource_count = @resources.size + @templates.size
  $stderr.puts "[zeromcp] #{@tools.size} tool(s), #{resource_count} resource(s), #{@prompts.size} prompt(s)"
  $stderr.puts "[zeromcp] stdio transport ready"

  $stdin.each_line do |line|
    begin
      line = line.encode('UTF-8', invalid: :replace, undef: :replace, replace: '').strip
    rescue StandardError
      next
    end
    next if line.empty?

    begin
      request = JSON.parse(line)
    rescue JSON::ParserError, EncodingError, StandardError
      next
    end

    next unless request.is_a?(Hash)

    response = handle_request(request)
    if response
      $stdout.puts JSON.generate(response)
      $stdout.flush
    end
  end
end

#serve_http(port: 3000) ⇒ Object

Start an HTTP server that exposes:

POST /mcp  — JSON-RPC over HTTP
<method> <path> — per-tool route handlers (tools with a `route:` field)

Usage: ZeroMcp::Server.new.serve_http(port: 3000)



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# File 'lib/zeromcp/server.rb', line 37

def serve_http(port: 3000)
  load_tools

  http = WEBrick::HTTPServer.new(Port: port, Logger: WEBrick::Log.new($stderr), AccessLog: [])
  $stderr.puts "[zeromcp] HTTP server listening on port #{port}"

  # /mcp — JSON-RPC endpoint
  http.mount_proc('/mcp') do |req, res|
    begin
      request = JSON.parse(req.body || '{}')
    rescue JSON::ParserError
      res.status = 400
      res.content_type = 'application/json'
      res.body = JSON.generate({ 'error' => 'Invalid JSON' })
      next
    end
    response = handle_request(request)
    res.content_type = 'application/json'
    res.body = JSON.generate(response || {})
  end

  # /openapi.json — auto-generated OpenAPI 3.0 spec from routed tools
  http.mount_proc('/openapi.json') do |_req, res|
    res.content_type = 'application/json'
    res.body = JSON.generate(build_openapi_spec)
  end

  # /docs — Swagger UI
  http.mount_proc('/docs') do |_req, res|
    res.content_type = 'text/html'
    res.body = SWAGGER_UI_HTML
  end

  # /health — liveness check
  http.mount_proc('/health') do |_req, res|
    res.content_type = 'application/json'
    res.body = JSON.generate({ 'ok' => true })
  end

  # Register per-tool HTTP routes
  @tools.each do |_name, tool|
    next unless tool.route.is_a?(Hash)
    register_tool_route(http, tool, tool.route_method, tool.route_path)
  end

  trap('INT')  { http.shutdown }
  trap('TERM') { http.shutdown }
  http.start
end