Class: Foobara::McpConnector

Inherits:
CommandConnector show all
Defined in:
foobara-mcp-connector-0.0.4/src/mcp_connector.rb,
foobara-mcp-connector-0.0.4/src/request.rb,
foobara-mcp-connector-0.0.4/src/session.rb,
foobara-mcp-connector-0.0.4/src/stdio_runner.rb,
foobara-mcp-connector-0.0.4/src/commands/noop.rb,
foobara-mcp-connector-0.0.4/src/jsonrpc_request.rb,
foobara-mcp-connector-0.0.4/src/commands/initialize.rb,
foobara-mcp-connector-0.0.4/src/commands/list_commands.rb

Overview

TODO: somehow give a way to specify an association depth when registering commands?

Defined Under Namespace

Modules: Commands Classes: JsonrpcRequest, Request, Session, StdioRunner

Instance Attribute Summary collapse

Attributes inherited from CommandConnector

#authenticator, #capture_unknown_error, #command_registry

Instance Method Summary collapse

Methods inherited from CommandConnector

#all_exposed_commands, allowed_rules_to_register, #authenticate, authenticator_registry, #build_command, #build_response, #connect, #connect_delayed, #delayed_connections, find_builtin_command_class, #find_builtin_command_class, #foobara_manifest, #lookup_command, #mutate_response, #normalize_manifest, #patch_up_broken_parents_for_errors_with_missing_command_parents, #process_delayed_connections, register_allowed_rule, register_authenticator, #request_to_response, #run_command, to_authenticator, #transform_command_class, #type_from_name

Constructor Details

#initialize(capture_unknown_error: true, server_name: default_server_name, server_version: default_server_version, instructions: default_instructions, default_serializers: Foobara::CommandConnectors::Serializers::AtomicSerializer) ⇒ McpConnector

Returns a new instance of McpConnector.



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 6

def initialize(
  *,
  capture_unknown_error: true,
  server_name: default_server_name,
  server_version: default_server_version,
  instructions: default_instructions,
  default_serializers: Foobara::CommandConnectors::Serializers::AtomicSerializer,
  **,
  &
)
  self.server_name = server_name
  self.server_version = server_version
  self.instructions = instructions

  super(*, capture_unknown_error:, default_serializers:, **, &)
end

Instance Attribute Details

#current_session ⇒ Object

Returns the value of attribute current_session.



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 4

def current_session
  @current_session
end

#instructions ⇒ Object

Returns the value of attribute instructions.



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 4

def instructions
  @instructions
end

#server_name ⇒ Object

Returns the value of attribute server_name.



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 4

def server_name
  @server_name
end

#server_version ⇒ Object

Returns the value of attribute server_version.



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 4

def server_version
  @server_version
end

Instance Method Details

#build_request ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 87

def build_request(*, **, &)
  request = super

  # We add a serializer to the top-level request but not to the children of a batch requests

  request.serializers = [*request.serializers, json_serializer]

  request
end

#default_instructions ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 31

def default_instructions
  "This is a Foobara MCP command connector which exposes Foobara commands to you as tools that you can invoke."
end

#default_server_name ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 23

def default_server_name
  "Foobara MCP Command connector"
end

#default_server_version ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 27

def default_server_version
  Gem.loaded_specs["foobara-mcp-connector"].version.to_s
end

#json_serializer ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 97

def json_serializer
  @json_serializer ||= Foobara::CommandConnectors::Serializers::JsonSerializer.new
end

#request_to_command(request) ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 43

def request_to_command(request)
  action = request.action

  return if request.error?

  case action
  when "initialize"
    command_class = find_builtin_command_class("Initialize")
  when "notifications/initialized", "notifications/cancelled", "notifications/progress",
    "notifications/roots/list_changed"
    command_class = find_builtin_command_class("Noop")
  else
    return super
  end

  full_command_name = command_class.full_command_name
  inputs = (request.params || {}).merge(request:)

  transformed_command_class = transformed_command_from_name(full_command_name) ||
                              transform_command_class(command_class)

  transformed_command_class.new(inputs)
rescue CommandConnector::NoCommandFoundError => e
  request.error = e
  nil
end

#run(*args, **opts) ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 35

def run(*args, **opts, &)
  super.body
end

#run_request(request) ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 75

def run_request(request)
  if request.batch? && !request.error
    request.batch.each do |batch_request|
      super(batch_request)
    end

    build_response(request)
  else
    super
  end
end

#run_stdio_server(io_in: $stdin, io_out: $stdout, io_err: $stderr) ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 39

def run_stdio_server(io_in: $stdin, io_out: $stdout, io_err: $stderr)
  StdioRunner.new(self).run(io_in: io_in, io_out: io_out, io_err: io_err)
end

#serialize_response_body(response) ⇒ Object

TODO: feels awkward needing to override this for such basic/typical behavior TODO: fix this interface/pattern higher-up



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 103

def serialize_response_body(response)
  super

  request = response.request

  unless request.notification?
    # TODO: total hack, clean this up somehow...
    if request.tool_call? && request.success?
      result = response.body[:result]

      result = json_serializer.serialize(result)

      response.body[:result] = { content: [{ type: "text", text: result }] }
    end

    if request.serializer
      response.body = request.serializer.process_value!(response.body)
    end
  end
end

#session_created(session) ⇒ Object

TODO: figure out how to support multiple sessions



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 71

def session_created(session)
  self.current_session = session
end

#set_response_body(response) ⇒ Object

TODO: Should this be implemented on response object instead??



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 125

def set_response_body(response)
  request = response.request

  return if request.notification?

  response.body = if request.valid_batch?
                    request.batch.map do |batched_request|
                      batched_request.response.body
                    end.compact
                  else
                    body = { jsonrpc: "2.0", id: request.request_id }

                    if request.error
                      body.merge(error: { message: request.error.message, code: response.status })
                    else
                      outcome = request.outcome

                      if outcome.success?
                        body.merge(result: outcome.result)
                      else
                        body.merge(error: {
                                     message: outcome.errors_sentence,
                                     data: outcome.errors_hash,
                                     code: response.status
                                   })
                      end
                    end
                  end
end

#set_response_status(response) ⇒ Object 



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# File 'foobara-mcp-connector-0.0.4/src/mcp_connector.rb', line 155

def set_response_status(response)
  return if response.request.valid_batch?

  request = response.request

  response.status = if request.error
                      case request.error
                      when Request::InvalidJsonrpcVersionError, Request::InvalidJsonrpcMethodError,
                        Request::InvalidJsonrpcParamsError, Request::EmptyBatchError,
                        Request::InvalidJsonrpcRequestStructureError
                        -32_600
                      when Request::InvalidJsonError
                        -32_700
                      when CommandConnector::NotFoundError
                        -32_601
                      when Request::FoobaraCommandsDoNotAcceptArraysError
                        -32_602
                      else
                        -32_603
                      end
                    elsif request.success?
                      0
                    else
                      errors = request.error_collection.error_array
                      error = errors.first

                      # Going to steal some http codes to be less confusing
                      case error
                      when Foobara::Entity::NotFoundError
                        # TODO: we should not be coupled to Entities here...
                        # :nocov:
                        404
                        # :nocov:
                      when CommandConnector::UnauthenticatedError
                        # :nocov:
                        401
                        # :nocov:
                      when CommandConnector::NotAllowedError
                        # :nocov:
                        403
                        # :nocov:
                      when CommandConnector::UnknownError
                        -32_603
                      when Foobara::DataError
                        -32_602
                      end || -32_600
                    end
end