Class: Kdeploy::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/kdeploy/runner.rb

Overview

Concurrent task runner for executing tasks across multiple hosts

Instance Method Summary collapse

Constructor Details

#initialize(hosts, tasks, parallel: Configuration.default_parallel, output: ConsoleOutput.new, debug: false, base_dir: nil) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/kdeploy/runner.rb', line 8

def initialize(hosts, tasks, parallel: Configuration.default_parallel, output: ConsoleOutput.new,
               debug: false, base_dir: nil)
  @hosts = hosts
  @tasks = tasks
  @parallel = parallel
  @output = output
  @debug = debug
  @base_dir = base_dir
  @pool = Concurrent::FixedThreadPool.new(@parallel)
  @results = Concurrent::Hash.new
end

Instance Method Details

#create_task_futures(task) ⇒ Object 



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# File 'lib/kdeploy/runner.rb', line 100

def create_task_futures(task)
  # Store host names in order to match with futures
  @host_names = @hosts.keys
  @hosts.map do |name, config|
    Concurrent::Future.execute(executor: @pool) do
      execute_task_for_host(name, config, task)
    end
  end
end

#execute_concurrent_tasks(task) ⇒ Object 



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# File 'lib/kdeploy/runner.rb', line 36

def execute_concurrent_tasks(task)
  futures = create_task_futures(task)

  # If no hosts, return empty results immediately
  return @results if futures.empty?

  # Show progress while waiting for tasks to complete
  total = futures.length
  completed = 0

  # Collect results from futures
  futures.each_with_index do |future, index|
    host_name = @host_names[index] # Get host name from the stored list
    begin
      # Wait for future to complete and get its value
      # This ensures the future has finished executing
      future_result = future.value

      # Handle the result
      if future_result.nil?
        # Future returned nil - create a default result
        @results[host_name] = { status: :unknown, error: 'Future returned nil', output: [] }
      elsif future_result.is_a?(Array) && future_result.length == 2
        name, result = future_result
        # Store the result using the name from the future
        @results[name] = result
      else
        # Handle unexpected result format - create a default result
        @results[host_name] = {
          status: :unknown,
          error: "Unexpected result format: #{future_result.class}",
          output: []
        }
      end

      # Check if future raised an exception
      if future.rejected?
        error = begin
          future.reason
        rescue StandardError
          'Unknown error'
        end
        @results[host_name] = { status: :failed, error: error, output: [] } unless @results.key?(host_name)
      end
    rescue StandardError => e
      # If future.value raises an exception, create an error result
      @results[host_name] = { status: :failed, error: "#{e.class}: #{e.message}", output: [] }
    ensure
      # Ensure we always have a result for this host
      @results[host_name] ||= { status: :unknown, error: 'No result collected', output: [] }
    end

    completed += 1
    # Show progress for multiple hosts
    next unless total > 1

    pastel = @output.respond_to?(:pastel) ? @output.pastel : Pastel.new
    @output.write_line(pastel.dim("    [Progress: #{completed}/#{total} hosts completed]"))
    @output.flush if @output.respond_to?(:flush)
  end

  @results
end

#find_task(task_name) ⇒ Object

Raises:



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# File 'lib/kdeploy/runner.rb', line 28

def find_task(task_name)
  task = @tasks[task_name]

  raise TaskNotFoundError, task_name unless task

  task
end

#run(task_name) ⇒ Object 



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# File 'lib/kdeploy/runner.rb', line 20

def run(task_name)
  task = find_task(task_name)
  results = execute_concurrent_tasks(task)
  results
ensure
  @pool.shutdown
end