Class: ClaudeAgentSDK::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/claude_agent_sdk/query.rb

Overview

Handles bidirectional control protocol on top of Transport

This class manages:

  • Control request/response routing

  • Hook callbacks

  • Tool permission callbacks

  • Message streaming

  • Initialization handshake

Constant Summary collapse

CONTROL_REQUEST_TIMEOUT_ENV_VAR = 
'CLAUDE_AGENT_SDK_CONTROL_REQUEST_TIMEOUT_SECONDS'
DEFAULT_CONTROL_REQUEST_TIMEOUT_SECONDS = 
1200.0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(transport:, is_streaming_mode:, can_use_tool: nil, hooks: nil, sdk_mcp_servers: nil) ⇒ Query

Returns a new instance of Query.



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/claude_agent_sdk/query.rb', line 26

def initialize(transport:, is_streaming_mode:, can_use_tool: nil, hooks: nil, sdk_mcp_servers: nil)
  @transport = transport
  @is_streaming_mode = is_streaming_mode
  @can_use_tool = can_use_tool
  @hooks = hooks || {}
  @sdk_mcp_servers = sdk_mcp_servers || {}

  # Control protocol state
  @pending_control_responses = {}
  @pending_control_results = {}
  @hook_callbacks = {}
  @hook_callback_timeouts = {}
  @next_callback_id = 0
  @request_counter = 0
  @inflight_control_request_tasks = {}

  # Message stream
  @message_queue = Async::Queue.new
  @task = nil
  @initialized = false
  @closed = false
  @initialization_result = nil
end

Instance Attribute Details

#is_streaming_mode ⇒ Object (readonly)

Returns the value of attribute is_streaming_mode.



21
22
23
 
# File 'lib/claude_agent_sdk/query.rb', line 21

def is_streaming_mode
  @is_streaming_mode
end

#sdk_mcp_servers ⇒ Object (readonly)

Returns the value of attribute sdk_mcp_servers.



21
22
23
 
# File 'lib/claude_agent_sdk/query.rb', line 21

def sdk_mcp_servers
  @sdk_mcp_servers
end

#transport ⇒ Object (readonly)

Returns the value of attribute transport.



21
22
23
 
# File 'lib/claude_agent_sdk/query.rb', line 21

def transport
  @transport
end

Instance Method Details

#close ⇒ Object

Close the query and transport



685
686
687
688
689
 
# File 'lib/claude_agent_sdk/query.rb', line 685

def close
  @closed = true
  @task&.stop
  @transport.close
end

#get_mcp_status ⇒ Hash

Get current MCP server connection status (only works with streaming mode)

Returns:

  • (Hash) —

    MCP status information, including mcpServers list



623
624
625
 
# File 'lib/claude_agent_sdk/query.rb', line 623

def get_mcp_status
  send_control_request({ subtype: 'mcp_status' })
end

#initialize_protocol ⇒ Hash?

Initialize control protocol if in streaming mode

Returns:

  • (Hash, nil) —

    Initialize response with supported commands, or nil if not streaming



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/claude_agent_sdk/query.rb', line 52

def initialize_protocol
  return nil unless @is_streaming_mode

  # Build hooks configuration for initialization
  hooks_config = {}
  if @hooks && !@hooks.empty?
    @hooks.each do |event, matchers|
      next if matchers.nil? || matchers.empty?

      hooks_config[event] = []
      matchers.each do |matcher|
        callback_ids = []
        (matcher[:hooks] || []).each do |callback|
          callback_id = "hook_#{@next_callback_id}"
          @next_callback_id += 1
          @hook_callbacks[callback_id] = callback
          @hook_callback_timeouts[callback_id] = matcher[:timeout] if matcher[:timeout]
          callback_ids << callback_id
        end
        hooks_config[event] << {
          matcher: matcher[:matcher],
          hookCallbackIds: callback_ids
        }
      end
    end
  end

  # Send initialize request
  request = {
    subtype: 'initialize',
    hooks: hooks_config.empty? ? nil : hooks_config
  }

  response = send_control_request(request)
  @initialized = true
  @initialization_result = response
  response
end

#interrupt ⇒ Object

Send interrupt control request



628
629
630
 
# File 'lib/claude_agent_sdk/query.rb', line 628

def interrupt
  send_control_request({ subtype: 'interrupt' })
end

#receive_messages(&block) ⇒ Object

Receive SDK messages (not control messages)



672
673
674
675
676
677
678
679
680
681
682
 
# File 'lib/claude_agent_sdk/query.rb', line 672

def receive_messages(&block)
  return enum_for(:receive_messages) unless block

  loop do
    message = @message_queue.dequeue
    break if message[:type] == 'end'
    raise message[:error] if message[:type] == 'error'

    block.call(message)
  end
end

#rewind_files(user_message_uuid) ⇒ Object

Rewind files to a previous checkpoint (v0.1.15+) Restores file state to what it was at the given user message Requires enable_file_checkpointing to be true in options

Parameters:

  • user_message_uuid (String) —

    The UUID of the UserMessage to rewind to



652
653
654
655
656
657
 
# File 'lib/claude_agent_sdk/query.rb', line 652

def rewind_files(user_message_uuid)
  send_control_request({
                         subtype: 'rewind_files',
                         userMessageUuid: user_message_uuid
                       })
end

#set_model(model) ⇒ Object

Change the AI model



641
642
643
644
645
646
 
# File 'lib/claude_agent_sdk/query.rb', line 641

def set_model(model)
  send_control_request({
                         subtype: 'set_model',
                         model: model
                       })
end

#set_permission_mode(mode) ⇒ Object

Change permission mode



633
634
635
636
637
638
 
# File 'lib/claude_agent_sdk/query.rb', line 633

def set_permission_mode(mode)
  send_control_request({
                         subtype: 'set_permission_mode',
                         mode: mode
                       })
end

#start ⇒ Object

Start reading messages from transport



92
93
94
95
96
97
98
 
# File 'lib/claude_agent_sdk/query.rb', line 92

def start
  return if @task

  @task = Async do |task|
    task.async { read_messages }
  end
end

#stream_input(stream) ⇒ Object

Stream input messages to transport



660
661
662
663
664
665
666
667
668
669
 
# File 'lib/claude_agent_sdk/query.rb', line 660

def stream_input(stream)
  stream.each do |message|
    break if @closed
    @transport.write(JSON.generate(message) + "\n")
  end
  @transport.end_input
rescue StandardError => e
  # Log error but don't raise
  warn "Error streaming input: #{e.message}"
end