Class: DebugMcp::Tools::ContinueExecution

Inherits:
MCP::Tool
  • Object
show all
Defined in:
lib/debug_mcp/tools/continue_execution.rb

Constant Summary collapse

HTTP_JOIN_TIMEOUT = 
10

Class Method Summary collapse

Class Method Details

.call(session_id: nil, server_context:) ⇒ Object 



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# File 'lib/debug_mcp/tools/continue_execution.rb', line 34

def call(session_id: nil, server_context:)
  client = server_context[:session_manager].client(session_id)

  # Check breakpoint existence before continuing (for timeout message)
  has_breakpoints = check_breakpoints(client)

  # Retrieve and clear pending HTTP info before continuing
  pending = client.pending_http
  client.pending_http = nil if pending

  output = if pending
    client.send_continue { pending[:holder][:done] }
  else
    client.send_continue
  end

  # The debug gem may send an `input` prompt just before the process exits
  # (e.g., on a return event from the main script). When output is empty,
  # check if the process has actually exited.
  if output.strip.empty? && client.process_finished?
    text = DebugMcp::ExitMessageBuilder.build_exit_message(
      "Program finished execution.", output, client,
    )
    text = append_http_response(text, pending)
    return MCP::Tool::Response.new([{ type: "text", text: text }])
  end

  client.cleanup_one_shot_breakpoints(output)
  output = DebugMcp::StopEventAnnotator.annotate_breakpoint_hit(output)
  output = DebugMcp::StopEventAnnotator.enrich_stop_context(output, client)

  text = "Execution resumed.\n\n#{output}"
  text = append_http_response(text, pending)
  MCP::Tool::Response.new([{ type: "text", text: text }])
rescue DebugMcp::SessionError => e
  text = if e.message.include?("session ended") || e.message.include?("finished execution")
    DebugMcp::ExitMessageBuilder.build_exit_message("Program finished execution.", e.final_output, client)
  else
    "Error: #{e.message}"
  end
  text = append_http_response(text, pending)
  MCP::Tool::Response.new([{ type: "text", text: text }])
rescue DebugMcp::TimeoutError
  text = if has_breakpoints
    ">>> PROCESS STATE: RUNNING (not paused) <<<\n\n" \
    "No breakpoint was hit within the timeout period.\n\n" \
    "Next steps:\n" \
    "1. set_breakpoint on a specific code path\n" \
    "2. trigger_request to send an HTTP request (auto-resumes)\n" \
    "3. disconnect to detach"
  else
    ">>> PROCESS STATE: RUNNING (not paused) <<<\n\n" \
    "Process resumed successfully (no breakpoints set).\n\n" \
    "Next steps:\n" \
    "1. set_breakpoint to add breakpoints\n" \
    "2. trigger_request to send an HTTP request and hit a breakpoint"
  end
  timeout_sec = server_context[:session_manager]&.timeout
  if timeout_sec
    text += "\n\nNote: The debug session will remain active for " \
            "#{timeout_sec / 60} minutes of inactivity. Any tool call resets the timer."
  end
  text = append_http_response(text, pending)
  MCP::Tool::Response.new([{ type: "text", text: text }])
rescue DebugMcp::ConnectionError => e
  text = if e.message.include?("Connection lost") || e.message.include?("connection closed")
    DebugMcp::ExitMessageBuilder.build_exit_message(
      "Program finished execution (connection closed).", e.final_output, client,
    )
  else
    "Error: #{e.message}"
  end
  text = append_http_response(text, pending)
  MCP::Tool::Response.new([{ type: "text", text: text }])
rescue DebugMcp::Error => e
  MCP::Tool::Response.new([{ type: "text", text: "Error: #{e.message}" }])
end