Class: ClaudeAgentSDK::SubprocessCLITransport

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

Overview

Subprocess transport using Claude Code CLI

Constant Summary collapse

DEFAULT_MAX_BUFFER_SIZE =

1MB buffer limit

1024 * 1024
MINIMUM_CLAUDE_CODE_VERSION = 
'2.0.0'

Instance Method Summary collapse

Constructor Details

#initialize(prompt, options) ⇒ SubprocessCLITransport

Returns a new instance of SubprocessCLITransport.



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 15

def initialize(prompt, options)
  @prompt = prompt
  @is_streaming = !prompt.is_a?(String)
  @options = options
  @cli_path = options.cli_path || find_cli
  @cwd = options.cwd
  @process = nil
  @stdin = nil
  @stdout = nil
  @stderr = nil
  @ready = false
  @exit_error = nil
  @max_buffer_size = options.max_buffer_size || DEFAULT_MAX_BUFFER_SIZE
  @stderr_task = nil
end

Instance Method Details

#build_command ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 60

def build_command
  cmd = [@cli_path, '--output-format', 'stream-json', '--verbose']

  # System prompt handling
  if @options.system_prompt
    if @options.system_prompt.is_a?(String)
      cmd.concat(['--system-prompt', @options.system_prompt])
    elsif @options.system_prompt.is_a?(Hash) &&
          @options.system_prompt[:type] == 'preset' &&
          @options.system_prompt[:append]
      cmd.concat(['--append-system-prompt', @options.system_prompt[:append]])
    end
  end

  cmd.concat(['--allowedTools', @options.allowed_tools.join(',')]) unless @options.allowed_tools.empty?
  cmd.concat(['--max-turns', @options.max_turns.to_s]) if @options.max_turns
  cmd.concat(['--disallowedTools', @options.disallowed_tools.join(',')]) unless @options.disallowed_tools.empty?
  cmd.concat(['--model', @options.model]) if @options.model
  cmd.concat(['--permission-prompt-tool', @options.permission_prompt_tool_name]) if @options.permission_prompt_tool_name
  cmd.concat(['--permission-mode', @options.permission_mode]) if @options.permission_mode
  cmd << '--continue' if @options.continue_conversation
  cmd.concat(['--resume', @options.resume]) if @options.resume
  cmd.concat(['--settings', @options.settings]) if @options.settings

  # Add directories
  @options.add_dirs.each do |dir|
    cmd.concat(['--add-dir', dir.to_s])
  end

  # MCP servers
  if @options.mcp_servers && !@options.mcp_servers.empty?
    if @options.mcp_servers.is_a?(Hash)
      servers_for_cli = {}
      @options.mcp_servers.each do |name, config|
        if config.is_a?(Hash) && config[:type] == 'sdk'
          # For SDK servers, exclude instance field
          sdk_config = config.reject { |k, _| k == :instance }
          servers_for_cli[name] = sdk_config
        else
          servers_for_cli[name] = config
        end
      end
      cmd.concat(['--mcp-config', JSON.generate({ mcpServers: servers_for_cli })]) unless servers_for_cli.empty?
    else
      cmd.concat(['--mcp-config', @options.mcp_servers.to_s])
    end
  end

  cmd << '--include-partial-messages' if @options.include_partial_messages
  cmd << '--fork-session' if @options.fork_session

  # Agents
  if @options.agents
    agents_dict = @options.agents.transform_values do |agent_def|
      {
        description: agent_def.description,
        prompt: agent_def.prompt,
        tools: agent_def.tools,
        model: agent_def.model
      }.compact
    end
    cmd.concat(['--agents', JSON.generate(agents_dict)])
  end

  # Setting sources
  sources_value = @options.setting_sources ? @options.setting_sources.join(',') : ''
  cmd.concat(['--setting-sources', sources_value])

  # Extra args
  @options.extra_args.each do |flag, value|
    if value.nil?
      cmd << "--#{flag}"
    else
      cmd.concat(["--#{flag}", value.to_s])
    end
  end

  # Prompt handling
  if @is_streaming
    cmd.concat(['--input-format', 'stream-json'])
  else
    cmd.concat(['--print', '--', @prompt.to_s])
  end

  cmd
end

#check_claude_version ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 342

def check_claude_version
  begin
    output = `#{@cli_path} -v 2>&1`.strip
    if match = output.match(/([0-9]+\.[0-9]+\.[0-9]+)/)
      version = match[1]
      version_parts = version.split('.').map(&:to_i)
      min_parts = MINIMUM_CLAUDE_CODE_VERSION.split('.').map(&:to_i)

      if version_parts < min_parts
        warning = "Warning: Claude Code version #{version} is unsupported in the Agent SDK. " \
                  "Minimum required version is #{MINIMUM_CLAUDE_CODE_VERSION}. " \
                  "Some features may not work correctly."
        warn warning
      end
    end
  rescue StandardError
    # Ignore version check errors
  end
end

#close ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 222

def close
  @ready = false
  return unless @process

  # Cancel stderr task
  @stderr_task&.stop

  # Close streams
  begin
    @stdin&.close
  rescue StandardError
    # Ignore
  end
  begin
    @stderr&.close
  rescue StandardError
    # Ignore
  end

  # Terminate process
  begin
    @process.terminate
    @process.wait
  rescue StandardError
    # Ignore
  end

  @process = nil
  @stdout = nil
  @stdin = nil
  @stderr = nil
  @exit_error = nil
end

#connect ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 147

def connect
  return if @process

  check_claude_version

  cmd = build_command

  # Build environment
  process_env = ENV.to_h.merge(@options.env).merge(
    'CLAUDE_CODE_ENTRYPOINT' => 'sdk-rb',
    'CLAUDE_AGENT_SDK_VERSION' => VERSION
  )
  process_env['PWD'] = @cwd.to_s if @cwd

  # Determine stderr handling
  should_pipe_stderr = @options.stderr || @options.extra_args.key?('debug-to-stderr')

  begin
    # Start process
    @process = Async::Process::Child.new(
      *cmd,
      stdin: :pipe,
      stdout: :pipe,
      stderr: should_pipe_stderr ? :pipe : nil,
      chdir: @cwd&.to_s,
      env: process_env
    )

    @stdout = @process.stdout
    @stdin = @process.stdin if @is_streaming

    # Handle stderr if piped
    if should_pipe_stderr && @process.stderr
      @stderr = @process.stderr
      @stderr_task = Async do
        handle_stderr
      rescue StandardError
        # Ignore errors during stderr reading
      end
    end

    # Close stdin for non-streaming mode
    @process.stdin.close unless @is_streaming

    @ready = true
  rescue Errno::ENOENT => e
    # Check if error is from cwd or CLI
    if @cwd && !File.directory?(@cwd.to_s)
      error = CLIConnectionError.new("Working directory does not exist: #{@cwd}")
      @exit_error = error
      raise error
    end
    error = CLINotFoundError.new("Claude Code not found at: #{@cli_path}")
    @exit_error = error
    raise error
  rescue StandardError => e
    error = CLIConnectionError.new("Failed to start Claude Code: #{e}")
    @exit_error = error
    raise error
  end
end

#end_input ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 272

def end_input
  return unless @stdin

  begin
    @stdin.close
  rescue StandardError
    # Ignore
  end
  @stdin = nil
end

#find_cli ⇒ Object

Raises:



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 31

def find_cli
  # Try which command first
  cli = `which claude 2>/dev/null`.strip
  return cli unless cli.empty?

  # Try common locations
  locations = [
    File.join(Dir.home, '.claude/local/claude'),  # Claude Code default install location
    File.join(Dir.home, '.npm-global/bin/claude'),
    '/usr/local/bin/claude',
    File.join(Dir.home, '.local/bin/claude'),
    File.join(Dir.home, 'node_modules/.bin/claude'),
    File.join(Dir.home, '.yarn/bin/claude')
  ]

  locations.each do |path|
    return path if File.exist?(path) && File.file?(path)
  end

  raise CLINotFoundError.new(
    "Claude Code not found. Install with:\n" \
    "  npm install -g @anthropic-ai/claude-code\n" \
    "\nIf already installed locally, try:\n" \
    '  export PATH="$HOME/node_modules/.bin:$PATH"' \
    "\n\nOr provide the path via ClaudeAgentOptions:\n" \
    "  ClaudeAgentOptions.new(cli_path: '/path/to/claude')"
  )
end

#handle_stderr ⇒ Object 



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 209

def handle_stderr
  return unless @stderr

  @stderr.each_line do |line|
    line_str = line.chomp
    next if line_str.empty?

    @options.stderr&.call(line_str)
  end
rescue StandardError
  # Ignore errors during stderr reading
end

#read_messages(&block) ⇒ Object

Raises:



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 283

def read_messages(&block)
  return enum_for(:read_messages) unless block_given?

  raise CLIConnectionError, 'Not connected' unless @process && @stdout

  json_buffer = ''

  begin
    @stdout.each_line do |line|
      line_str = line.strip
      next if line_str.empty?

      json_lines = line_str.split("\n")

      json_lines.each do |json_line|
        json_line = json_line.strip
        next if json_line.empty?

        json_buffer += json_line

        if json_buffer.bytesize > @max_buffer_size
          buffer_length = json_buffer.bytesize
          json_buffer = ''
          raise CLIJSONDecodeError.new(
            "JSON message exceeded maximum buffer size",
            StandardError.new("Buffer size #{buffer_length} exceeds limit #{@max_buffer_size}")
          )
        end

        begin
          data = JSON.parse(json_buffer, symbolize_names: true)
          json_buffer = ''
          yield data
        rescue JSON::ParserError
          # Continue accumulating
          next
        end
      end
    end
  rescue IOError
    # Stream closed
  rescue StopIteration
    # Client disconnected
  end

  # Check process completion
  status = @process.wait
  returncode = status.exitstatus

  if returncode && returncode != 0
    @exit_error = ProcessError.new(
      "Command failed with exit code #{returncode}",
      exit_code: returncode,
      stderr: 'Check stderr output for details'
    )
    raise @exit_error
  end
end

#ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 362

def ready?
  @ready
end

#write(data) ⇒ Object

Raises:



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# File 'lib/claude_agent_sdk/subprocess_cli_transport.rb', line 256

def write(data)
  raise CLIConnectionError, 'ProcessTransport is not ready for writing' unless @ready && @stdin
  raise CLIConnectionError, "Cannot write to terminated process" if @process && @process.status

  raise CLIConnectionError, "Cannot write to process that exited with error: #{@exit_error}" if @exit_error

  begin
    @stdin.write(data)
    @stdin.flush
  rescue StandardError => e
    @ready = false
    @exit_error = CLIConnectionError.new("Failed to write to process stdin: #{e}")
    raise @exit_error
  end
end