Class: MCP::Server::Transports::StreamableHTTPTransport

Inherits:
Transport
  • Object
show all
Defined in:
lib/mcp/server/transports/streamable_http_transport.rb

Constant Summary collapse

REQUIRED_POST_ACCEPT_TYPES = 
["application/json", "text/event-stream"].freeze
REQUIRED_GET_ACCEPT_TYPES = 
["text/event-stream"].freeze

Instance Method Summary collapse

Methods inherited from Transport

#handle_json_request, #open, #send_response

Constructor Details

#initialize(server, stateless: false) ⇒ StreamableHTTPTransport

Returns a new instance of StreamableHTTPTransport.



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# File 'lib/mcp/server/transports/streamable_http_transport.rb', line 11

def initialize(server, stateless: false)
  super(server)
  # { session_id => { stream: stream_object }
  @sessions = {}
  @mutex = Mutex.new

  @stateless = stateless
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/mcp/server/transports/streamable_http_transport.rb', line 36

def close
  @mutex.synchronize do
    @sessions.each_key { |session_id| cleanup_session_unsafe(session_id) }
  end
end

#handle_request(request) ⇒ Object 



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# File 'lib/mcp/server/transports/streamable_http_transport.rb', line 23

def handle_request(request)
  case request.env["REQUEST_METHOD"]
  when "POST"
    handle_post(request)
  when "GET"
    handle_get(request)
  when "DELETE"
    handle_delete(request)
  else
    method_not_allowed_response
  end
end

#send_notification(method, params = nil, session_id: nil) ⇒ Object 



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# File 'lib/mcp/server/transports/streamable_http_transport.rb', line 42

def send_notification(method, params = nil, session_id: nil)
  # Stateless mode doesn't support notifications
  raise "Stateless mode does not support notifications" if @stateless

  notification = {
    jsonrpc: "2.0",
    method: method,
  }
  notification[:params] = params if params

  @mutex.synchronize do
    if session_id
      # Send to specific session
      session = @sessions[session_id]
      return false unless session && session[:stream]

      begin
        send_to_stream(session[:stream], notification)
        true
      rescue IOError, Errno::EPIPE => e
        MCP.configuration.exception_reporter.call(
          e,
          { session_id: session_id, error: "Failed to send notification" },
        )
        cleanup_session_unsafe(session_id)
        false
      end
    else
      # Broadcast to all connected SSE sessions
      sent_count = 0
      failed_sessions = []

      @sessions.each do |sid, session|
        next unless session[:stream]

        begin
          send_to_stream(session[:stream], notification)
          sent_count += 1
        rescue IOError, Errno::EPIPE => e
          MCP.configuration.exception_reporter.call(
            e,
            { session_id: sid, error: "Failed to send notification" },
          )
          failed_sessions << sid
        end
      end

      # Clean up failed sessions
      failed_sessions.each { |sid| cleanup_session_unsafe(sid) }

      sent_count
    end
  end
end