Class: MutationTester::MutationRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/mutation_tester/mutation_runner.rb

Constant Summary collapse

CANARY_SOURCE = 
"raise 'mutation_tester canary: the workspace copy of this source was not executed'\n".freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_file, spec_file, original_content, config) ⇒ MutationRunner

Returns a new instance of MutationRunner.



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# File 'lib/mutation_tester/mutation_runner.rb', line 31

def initialize(source_file, spec_file, original_content, config)
  @source_file = File.expand_path(source_file)
  @spec_file = File.expand_path(spec_file)
  @original_content = original_content
  @config = config
  @use_bundle_exec = TestCommand.use_bundle_exec?(@source_file)
end

Class Method Details

.backup_path_for(source_file) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 39

def self.backup_path_for(source_file)
  "#{File.expand_path(source_file)}.mutation_backup"
end

.recover_in_place_backup(source_file) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 43

def self.recover_in_place_backup(source_file)
  backup = backup_path_for(source_file)
  return false unless File.exist?(backup)

  File.write(File.expand_path(source_file), File.read(backup))
  File.delete(backup)
  true
end

Instance Method Details

#cleanup_shadow_workspaces ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 230

def cleanup_shadow_workspaces
  root = @shadow_run_root
  return unless root

  begin
    FileUtils.remove_entry(root) if File.directory?(root)
  rescue SystemCallError
    nil
  end
  @shadow_run_root = nil
  @worker_shadow_root = nil
end

#detect_test_framework(spec_path) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 388

def detect_test_framework(spec_path)
  FrameworkDetector.detect(spec_path)
end

#discoverable_project_root ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 301

def discoverable_project_root
  find_project_root
rescue MutationTester::Error
  nil
end

#find_project_root ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 307

def find_project_root
  current = File.dirname(File.expand_path(@source_file))
  loop do
    return current if File.exist?(File.join(current, 'Gemfile')) || File.exist?(File.join(current, '.git'))

    parent = File.dirname(current)

    if parent == current || parent == Dir.home || parent == '/'
      raise MutationTester::Error, "Could not find project root (looking for Gemfile or .git). Stopped at #{parent}"
    end

    current = parent
  end
end

#in_memory_first? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mutation_tester/mutation_runner.rb', line 65

def in_memory_first?
  return false if @config.worker_env_var

  %i[in_memory auto].include?(@config.runner)
end

#run(mutations, &progress_callback) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 52

def run(mutations, &progress_callback)
  announce_worker_env_in_memory_opt_out
  if in_memory_first? && @config.parallel_processes > 1
    run_in_memory_parallel(mutations, &progress_callback)
  elsif in_memory_first?
    run_in_memory_series(mutations, &progress_callback)
  elsif @config.parallel_processes == 1
    run_in_place_series(mutations, &progress_callback)
  else
    run_in_shadow_parallel(mutations, &progress_callback)
  end
end

#run_in_memory_parallel(mutations, &progress_callback) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 99

def run_in_memory_parallel(mutations, &progress_callback)
  blocker = prepare_in_memory_execution
  return fall_back_to_parallel_file_based(blocker, mutations, &progress_callback) if blocker

  pool = ForkRunner.prepare_in_memory_pool([@config.parallel_processes, mutations.size].min, @in_memory_runner)
  if pool.compact.empty?
    return fall_back_to_parallel_file_based('the preloaded worker pool could not be cloned', mutations, &progress_callback)
  end

  warn "[MutationTester] In-memory execution selected (parallel, #{pool.size} preloaded workers, zero file writes per mutant)."
  announce_load_time_routing(mutations)
  total = mutations.size
  completed_count = 0
  collected = []
  project_root = discoverable_project_root
  reserve_fallback_shadow_root

  report_progress = lambda do |_item, _index, result|
    completed_count += 1
    collected << result
    if progress_callback && (completed_count.even? || completed_count == total)
      progress_callback.call(nil, completed_count)
    end
    raise Parallel::Break if stop_early?(result)
  end

  mapped = with_parallel_interrupt_silenced do
    Parallel.map(mutations, in_processes: pool.size, finish: report_progress) do |mutation|
      run_single_mutation(mutation, :in_memory, project_root)
    end
  end
  mapped || collected
ensure
  ForkRunner.shutdown_in_memory_pool
  shutdown_in_memory_worker
  cleanup_shadow_workspaces
end

#run_in_memory_series(mutations, &progress_callback) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 71

def run_in_memory_series(mutations, &progress_callback)
  blocker = prepare_in_memory_execution
  return fall_back_to_file_based(blocker, mutations, &progress_callback) if blocker

  warn '[MutationTester] In-memory execution selected (serial, zero file writes per mutant).'
  announce_load_time_routing(mutations)
  results = []
  begin
    mutations.each_with_index do |mutation, index|
      unless @in_memory_runner&.ready?
        return results + fall_back_to_file_based(
          'the in-memory worker terminated unexpectedly',
          mutations.drop(index), completed: index, &progress_callback
        )
      end

      result = run_single_mutation(mutation, :in_memory)
      progress_callback.call(mutation, index + 1) if progress_callback
      results << result
      break if stop_early?(result)
    end
  ensure
    shutdown_in_memory_worker
    cleanup_shadow_workspaces
  end
  results
end

#run_in_place_series(mutations, &progress_callback) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 164

def run_in_place_series(mutations, &progress_callback)
  write_in_place_backup
  results = []
  mutations.each_with_index do |mutation, index|
    result = run_single_mutation(mutation, :in_place)
    progress_callback.call(mutation, index + 1) if progress_callback
    results << result
    break if stop_early?(result)
  end
  results
ensure
  restore_and_clear_in_place_backup
end

#run_in_shadow_parallel(mutations, &progress_callback) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 137

def run_in_shadow_parallel(mutations, &progress_callback)
  total = mutations.size
  completed_count = 0
  collected = []
  project_root = find_project_root
  shadow_run_root
  prepare_worker_preloads(total)

  report_progress = lambda do |_item, _index, result|
    completed_count += 1
    collected << result
    if progress_callback && (completed_count.even? || completed_count == total)
      progress_callback.call(nil, completed_count)
    end
    raise Parallel::Break if stop_early?(result)
  end

  mapped = with_parallel_interrupt_silenced do
    Parallel.map(mutations, in_processes: @config.parallel_processes, finish: report_progress) do |mutation|
      run_single_mutation(mutation, :shadow, project_root)
    end
  end
  mapped || collected
ensure
  cleanup_shadow_workspaces
end

#run_mutation_in_memory(mutation, result, project_root = nil) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 341

def run_mutation_in_memory(mutation, result, project_root = nil)
  runner = active_in_memory_runner
  return in_memory_worker_fallback(mutation, result, project_root, 'the in-memory worker is unavailable') unless runner&.ready?

  outcome = runner.execute_in_memory(
    source: mutation[:code],
    path: @source_file,
    timeout: @config.effective_timeout,
    chdir: Dir.pwd
  )

  if outcome.status == 'error'
    in_memory_apply_fallback(mutation, result, project_root, outcome.message || 'in-memory application failed')
  else
    apply_outcome(result, TestCommand::Result.new(outcome.status == 'pass', outcome.status == 'timeout'))
  end
rescue MutationTester::Error => e
  return in_memory_worker_fallback(mutation, result, project_root, e.message) if project_root

  mark_error(result, e)
rescue StandardError => e
  mark_error(result, e)
end

#run_mutation_in_place(mutation, result) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 322

def run_mutation_in_place(mutation, result)

  File.write(@source_file, mutation[:code])

  outcome, phase = run_two_phase(mutation) do |example_filters|
    run_specs_in_place(@spec_file, example_filters: example_filters)
  end
  apply_outcome(result, outcome, phase)
rescue StandardError, Interrupt => e
  mark_error(result, e)
  raise e if e.is_a?(Interrupt)
ensure
  File.write(@source_file, @original_content)
end

#run_mutation_in_shadow(mutation, result, project_root) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 207

def run_mutation_in_shadow(mutation, result, project_root)
  shadow_root = worker_shadow_root(project_root)

  relative_source = Pathname.new(@source_file).relative_path_from(Pathname.new(project_root)).to_s
  shadow_source = File.join(shadow_root, relative_source)
  relative_spec = Pathname.new(@spec_file).relative_path_from(Pathname.new(project_root)).to_s
  shadow_spec = File.join(shadow_root, relative_spec)

  begin
    File.unlink(shadow_source) if File.symlink?(shadow_source)
    File.write(shadow_source, mutation[:code])

    outcome, phase = run_two_phase(mutation) do |example_filters|
      run_specs_in_shadow(shadow_spec, shadow_root, project_root, example_filters: example_filters)
    end
    apply_outcome(result, outcome, phase)
  ensure
    restore_shadow_source(shadow_source, result)
  end
rescue => e
  mark_error(result, e)
end

#run_single_mutation(mutation, strategy, project_root = nil) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 178

def run_single_mutation(mutation, strategy, project_root = nil)
  {
    id: mutation[:id],
    type: mutation[:type],
    line: mutation[:line],
    file_path: @source_file,
    original: mutation[:original],
    mutated: mutation[:mutated],
    source_line: mutation[:source_line],
    mutated_line: mutation[:mutated_line],
    killed: false,
    timeout: false,
    status: :survived,
    description: mutation[:description]
  }.tap do |result|
    if unparseable?(mutation[:code])
      mark_stillborn(result)
    elsif strategy == :in_memory && mutation[:in_memory_safe] == false
      run_mutation_load_time(mutation, result, project_root)
    elsif strategy == :in_memory
      run_mutation_in_memory(mutation, result, project_root)
    elsif strategy == :in_place
      run_mutation_in_place(mutation, result)
    else
      run_mutation_in_shadow(mutation, result, project_root)
    end
  end
end

#run_specs_in_place(spec_file, example_filters: []) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 337

def run_specs_in_place(spec_file, example_filters: [])
  test_command(spec_file, example_filters: example_filters).run(timeout: @config.effective_timeout)
end

#run_specs_in_shadow(spec_file, working_dir, project_root, example_filters: []) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 296

def run_specs_in_shadow(spec_file, working_dir, project_root, example_filters: [])
  test_command(spec_file, example_filters: example_filters)
    .run(timeout: @config.effective_timeout, chdir: working_dir, mirror_of: project_root)
end

#run_two_phase(mutation) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 365

def run_two_phase(mutation)
  filters = subset_filters(mutation)
  unless filters.empty?
    subset_outcome = yield(filters)
    return [subset_outcome, :subset] unless subset_outcome.passed?
  end

  [yield([]), :full]
end

#shadow_baseline_passes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mutation_tester/mutation_runner.rb', line 243

def shadow_baseline_passes?
  shadow_workspace_check == :ok
end

#shadow_copy_project(source, dest) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 274

def shadow_copy_project(source, dest)
  if source == '/' || source.match?(%r{^/(usr|bin|sbin|etc|var|opt)$})
    raise MutationTester::Error, "Refusing to shadow copy system directory: #{source}"
  end

  Dir.glob("#{source}/*", File::FNM_DOTMATCH).each do |path|
    next if ['.', '..', '.git', 'tmp', 'log', 'coverage', 'node_modules'].include?(File.basename(path))

    basename = File.basename(path)
    target = File.join(dest, basename)

    if File.directory?(path) && !File.symlink?(path)
      FileUtils.mkdir_p(target)
      shadow_copy_project(path, target)
    elsif File.extname(path) == '.rb'
      FileUtils.copy_file(path, target)
    else
      File.symlink(path, target)
    end
  end
end

#shadow_workspace_check ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 247

def shadow_workspace_check
  project_root = find_project_root

  Dir.mktmpdir do |temp_dir|
    shadow_root = File.join(temp_dir, 'shadow')
    FileUtils.mkdir_p(shadow_root)
    shadow_copy_project(project_root, shadow_root)

    relative_source = Pathname.new(@source_file).relative_path_from(Pathname.new(project_root)).to_s
    shadow_source = File.join(shadow_root, relative_source)
    relative_spec = Pathname.new(@spec_file).relative_path_from(Pathname.new(project_root)).to_s
    shadow_spec = File.join(shadow_root, relative_spec)

    File.unlink(shadow_source)
    File.write(shadow_source, @original_content)
    return :baseline unless run_specs_in_shadow(shadow_spec, shadow_root, project_root).passed?

    File.write(shadow_source, CANARY_SOURCE)
    return :canary if run_specs_in_shadow(shadow_spec, shadow_root, project_root).passed?

    :ok
  end
rescue => e
  warn("[MutationTester] Shadow sanity check could not prepare the shadow workspace: #{e.message}")
  :baseline
end

#subset_filters(mutation) ⇒ Object 



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# File 'lib/mutation_tester/mutation_runner.rb', line 375

def subset_filters(mutation)
  return [] unless @config.test_selection
  return [] unless detect_test_framework(@spec_file) == :rspec

  method_name = mutation[:method_name].to_s
  return [] if method_name.empty?

  content = spec_content
  ["##{method_name}", ".#{method_name}"].select do |token|
    content.match?(/['"]#{Regexp.escape(token)}/)
  end
end