Class: Manceps::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/manceps/client.rb

Overview

MCP protocol client supporting tools, resources, prompts, and notifications.

Constant Summary collapse

MAX_PAGES = 
100

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url_or_command, auth: Auth::None.new, args: nil, env: nil, max_retries: 3, **options) ⇒ Client

Returns a new instance of Client.



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# File 'lib/manceps/client.rb', line 8

def initialize(url_or_command, auth: Auth::None.new, args: nil, env: nil, max_retries: 3, **options)
  @transport = if args || !url_or_command.match?(%r{\Ahttps?://}i)
                 Transport::Stdio.new(url_or_command, args: args || [], env: env || {})
               else
                 Transport::StreamableHTTP.new(url_or_command, auth: auth, timeout: options[:timeout])
               end
  @session = Session.new
  @max_retries = max_retries
  @backoff = Backoff.new
  @notification_handlers = Hash.new { |h, k| h[k] = [] }
  @elicitation_handler = nil
end

Instance Attribute Details

#session ⇒ Object (readonly)

Returns the value of attribute session.



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# File 'lib/manceps/client.rb', line 6

def session
  @session
end

Class Method Details

.open(url) ⇒ Object 



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# File 'lib/manceps/client.rb', line 195

def self.open(url, **)
  client = new(url, **)
  client.connect
  yield client
ensure
  client&.disconnect
end

Instance Method Details

#await_task(task_id, interval: 1, timeout: nil) ⇒ Object 



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# File 'lib/manceps/client.rb', line 180

def await_task(task_id, interval: 1, timeout: nil)
  deadline = timeout ? Time.now + timeout : nil

  loop do
    task = get_task(task_id)
    return task if task.done?

    if deadline && Time.now >= deadline
      raise TimeoutError, "Task #{task_id} did not complete within #{timeout} seconds"
    end

    sleep interval
  end
end

#call_tool(name, **arguments) ⇒ Object 



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# File 'lib/manceps/client.rb', line 85

def call_tool(name, **arguments)
  response = request_with_retry('tools/call', name: name, arguments: arguments)
  ToolResult.new(response['result'])
end

#call_tool_streaming(name, **arguments, &block) ⇒ Object 



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# File 'lib/manceps/client.rb', line 90

def call_tool_streaming(name, **arguments, &block)
  body = JsonRpc.request(@session.next_id, 'tools/call', { name: name, arguments: arguments })
  wrapped_block = if block
                    proc do |event|
                      if event.is_a?(Hash) && event['id'] && event['method']
                        handle_server_request(event)
                      else
                        block.call(event)
                      end
                    end
                  end
  response = @transport.request_streaming(body, &wrapped_block)
  handle_rpc_error(response)
  ToolResult.new(response['result'])
end

#cancel_request(request_id, reason: nil) ⇒ Object 



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# File 'lib/manceps/client.rb', line 140

def cancel_request(request_id, reason: nil)
  params = { requestId: request_id }
  params[:reason] = reason if reason
  @transport.notify(JsonRpc.notification('notifications/cancelled', params))
end

#cancel_task(task_id) ⇒ Object

rubocop:disable Naming/PredicateMethod



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# File 'lib/manceps/client.rb', line 175

def cancel_task(task_id) # rubocop:disable Naming/PredicateMethod
  request('tasks/cancel', taskId: task_id)
  true
end

#connect ⇒ Object 



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# File 'lib/manceps/client.rb', line 21

def connect
  attempts = 0
  begin
    @transport.open if @transport.respond_to?(:open)

    init_response = @transport.request(
      JsonRpc.initialize_request(@session.next_id, capabilities: client_capabilities)
    )
    handle_rpc_error(init_response)
    @session.establish(init_response)

    unless Manceps.configuration.supported_versions.include?(@session.protocol_version)
      server_version = @session.protocol_version
      disconnect
      raise ProtocolError.new(
        "Server negotiated unsupported protocol version: #{server_version}",
        code: -32_600
      )
    end

    @transport.protocol_version = @session.protocol_version if @transport.respond_to?(:protocol_version=)

    @transport.notify(JsonRpc.initialized_notification)
    @backoff.reset
    self
  rescue ConnectionError, TimeoutError
    attempts += 1
    @transport.close if @transport.respond_to?(:close)
    @session.reset
    raise if attempts > @max_retries

    sleep @backoff.next_delay
    retry
  end
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/manceps/client.rb', line 64

def connected?
  @session.active?
end

#disconnect ⇒ Object 



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# File 'lib/manceps/client.rb', line 57

def disconnect
  sid = @transport.respond_to?(:session_id) ? @transport.session_id : @session.id
  @transport.terminate_session(sid) if sid
  @transport.close
  @session.reset
end

#get_prompt(name, **arguments) ⇒ Object 



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# File 'lib/manceps/client.rb', line 110

def get_prompt(name, **arguments)
  response = request_with_retry('prompts/get', name: name, arguments: arguments)
  PromptResult.new(response['result'])
end

#get_task(task_id) ⇒ Object 



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# File 'lib/manceps/client.rb', line 170

def get_task(task_id)
  response = request('tasks/get', taskId: task_id)
  Task.new(response['result'])
end

#listen ⇒ Object 



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# File 'lib/manceps/client.rb', line 146

def listen
  @transport.listen do |message|
    if message['id'] && message['method']
      handle_server_request(message)
    else
      method = message['method']
      params = message['params']
      handlers = @notification_handlers[method]
      handlers&.each { |h| h.call(params) }
    end
  end
end

#on(method, &block) ⇒ Object 



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# File 'lib/manceps/client.rb', line 128

def on(method, &block)
  @notification_handlers[method] << block
end

#on_elicitation(&block) ⇒ Object 



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# File 'lib/manceps/client.rb', line 159

def on_elicitation(&block)
  @elicitation_handler = block
end

#ping ⇒ Object 



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# File 'lib/manceps/client.rb', line 74

def ping
  @transport.notify(JsonRpc.notification('ping'))
  true
rescue ConnectionError, TimeoutError
  false
end

#prompts(force: false) ⇒ Object

rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/manceps/client.rb', line 106

def prompts(force: false) # rubocop:disable Lint/UnusedMethodArgument
  paginate_with_retry('prompts/list', 'prompts') { |data| Prompt.new(data) }
end

#read_resource(uri) ⇒ Object 



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# File 'lib/manceps/client.rb', line 123

def read_resource(uri)
  response = request_with_retry('resources/read', uri: uri)
  ResourceContents.new(response['result'])
end

#reconnect! ⇒ Object 



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# File 'lib/manceps/client.rb', line 68

def reconnect!
  @transport.close
  @session.reset
  connect
end

#resource_templates ⇒ Object 



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# File 'lib/manceps/client.rb', line 119

def resource_templates
  paginate_with_retry('resources/templates/list', 'resourceTemplates') { |data| ResourceTemplate.new(data) }
end

#resources(force: false) ⇒ Object

rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/manceps/client.rb', line 115

def resources(force: false) # rubocop:disable Lint/UnusedMethodArgument
  paginate_with_retry('resources/list', 'resources') { |data| Resource.new(data) }
end

#subscribe_resource(uri) ⇒ Object 



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# File 'lib/manceps/client.rb', line 132

def subscribe_resource(uri)
  request('resources/subscribe', uri: uri)
end

#tasks ⇒ Object

— Tasks (experimental, protocol 2025-11-25) —



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# File 'lib/manceps/client.rb', line 165

def tasks
  response = request('tasks/list')
  (response.dig('result', 'tasks') || []).map { |data| Task.new(data) }
end

#tools(force: false) ⇒ Object

rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/manceps/client.rb', line 81

def tools(force: false) # rubocop:disable Lint/UnusedMethodArgument
  paginate_with_retry('tools/list', 'tools') { |data| Tool.new(data) }
end

#unsubscribe_resource(uri) ⇒ Object 



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# File 'lib/manceps/client.rb', line 136

def unsubscribe_resource(uri)
  request('resources/unsubscribe', uri: uri)
end