Class: Makit::Commands::Strategies::ChildProcess

Inherits:
Base
  • Object
show all
Defined in:
lib/makit/commands/strategies/child_process.rb

Overview

ChildProcess-based command execution strategy

This strategy uses the ChildProcess gem for robust cross-platform process management. It provides better handling of timeouts, I/O, and process lifecycle management compared to Open3.

Examples:

Basic usage

strategy = ChildProcess.new
result = strategy.execute(request)

With custom options

strategy = ChildProcess.new(
  timeout: 60,
  max_output_size: 1_000_000
)

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#config, #name, #supports?

Constructor Details

#initialize(timeout: 30, max_output_size: 1_000_000, **options) ⇒ ChildProcess

Initialize ChildProcess strategy

Parameters:

  • timeout (Integer) (defaults to: 30) —

    default timeout in seconds (default: 30)

  • max_output_size (Integer) (defaults to: 1_000_000) —

    maximum output size in bytes (default: 1MB)



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# File 'lib/makit/commands/strategies/child_process.rb', line 38

def initialize(timeout: 30, max_output_size: 1_000_000, **options)
  @timeout = timeout
  @max_output_size = max_output_size
  super(**options)
end

Instance Attribute Details

#max_output_size ⇒ Object (readonly)

Returns the value of attribute max_output_size.



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# File 'lib/makit/commands/strategies/child_process.rb', line 32

def max_output_size
  @max_output_size
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/makit/commands/strategies/child_process.rb', line 28

def timeout
  @timeout
end

Instance Method Details

#execute(request) ⇒ Result

Execute a command request using ChildProcess

Parameters:

  • request (Request) —

    the command request to execute

Returns:

  • (Result) —

    execution result



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# File 'lib/makit/commands/strategies/child_process.rb', line 48

def execute(request)
  result = Result.new(
    command: request.to_shell_command,
    started_at: Time.now,
  )

  stdout_file = nil
  stderr_file = nil
  process = nil

  begin
    # Create temporary files for output
    stdout_file = Tempfile.new('makit_stdout')
    stderr_file = Tempfile.new('makit_stderr')

    # Build the process
    process = ChildProcess.build(request.command, *request.arguments)

    # Set working directory
    process.cwd = request.directory if request.directory

    # Set environment variables
    (request.environment || {}).each do |key, value|
      process.environment[key] = value.to_s
    end

    # Set up I/O
    process.io.stdout = stdout_file
    process.io.stderr = stderr_file

    # Start the process
    process.start

    # Wait for completion with timeout
    timeout_seconds = request.timeout || @timeout
    process.poll_for_exit(timeout_seconds)

    # Read output
    stdout_file.rewind
    stderr_file.rewind
    stdout = stdout_file.read
    stderr = stderr_file.read

    # Truncate output if too large
    stdout = truncate_output(stdout, "stdout")
    stderr = truncate_output(stderr, "stderr")

    result.finish!(
      exit_code: process.exit_code,
      stdout: stdout,
      stderr: stderr,
    )

  rescue ChildProcess::TimeoutError
    # Handle timeout
    process&.stop
    result.finish!(
      exit_code: 124,
      stderr: "Command timed out after #{timeout_seconds} seconds",
    ).add_metadata(:timeout, true)
    .add_metadata(:strategy, 'childprocess')

  rescue => e
    # Handle other errors
    process&.stop rescue nil
    result.finish!(
      exit_code: 1,
      stderr: e.message,
    ).add_metadata(:error_class, e.class.name)
    .add_metadata(:strategy, 'childprocess')

  ensure
    # Clean up resources
    [stdout_file, stderr_file].each do |file|
      file&.close
      file&.unlink rescue nil
    end
  end

  result
end

#execute_batch(requests) ⇒ Array<Result>

Execute multiple requests using ChildProcess

Parameters:

  • requests (Array<Request>) —

    requests to execute

Returns:

  • (Array<Result>) —

    execution results



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# File 'lib/makit/commands/strategies/child_process.rb', line 134

def execute_batch(requests)
  # For now, execute sequentially to avoid complexity
  # Could be enhanced to use process pools in the future
  requests.map { |request| execute(request) }
end