ruby - 从 Ruby 方法返回变量/数组时出错

Question

在我的 capistrano 任务中，我正在调用该superfunction方法。不幸的是，它抛出了一个Unexpected Return错误。我需要从superfunction方法中获取输出，以便在我的任务中进一步解析它。

def superfunction(cmd_type, command, client)
    run "#{command}" do |channel, stream, data|
        hostname = "#{channel[:host]}".tr('"','')
        result = "#{data}".to_s.strip
        return hostname, result
    end

end


task :gather, :roles => :hosts do
...
   servername, redhat_version = superfunction("redhat_version", "cat /etc/redhat-release", client)
end

Answer 1

正在生成错误，因为您的块在方法返回后被调用（可能 capistrano 将其存储在内部）。作为一种简单的解决方法，您可以使用块获取所需的变量：

def superfunction(cmd_type, command, client)
  run "#{command}" do |channel, stream, data|
    hostname = "#{channel[:host]}".tr('"','')
    result = "#{data}".to_s.strip
    yield(hostname, result)
  end
end

task :gather, :roles => :hosts do
  superfunction("redhat_version", "cat /etc/redhat-release", client) do |servername, redhat_version|
    # Use servername and redhat_version here
  end
end