Sinatra：在点击URL时运行ruby代码

Question

我想在每次击中网址/代码时运行脚本（code.rb）。

我该如何运行脚本？

require 'sinatra'
get '/' do
  #run the script
end

Answer 1

分叉另一个过程：

system('ruby code.rb')

...或者只是将脚本load到当前上下文中：

load 'code.rb' # *not* require

Answer 2

您需要load代码以确保每次都运行它; require只会在第一个请求中加载一次代码，然后不再加载：

smagic:Desktop phrogz$ cat hi.rb
  puts "hi"

smagic:Desktop phrogz$ cat test.rb
  require 'sinatra'
  get '/require' do
    x = require_relative( 'hi.rb' )
    "require sez #{x}"
  end

  get '/load' do
    x = load( 'hi.rb' )
    "load sez #{x}"
  end

smagic:Desktop phrogz$ ruby test.rb 
  == Sinatra/1.1.2 has taken the stage on 4567 for development with backup from Thin
  >> Thin web server (v1.2.7 codename No Hup)
  >> Maximum connections set to 1024
  >> Listening on 0.0.0.0:4567, CTRL+C to stop
  hi
  127.0.0.1 - - [16/Jan/2011 20:49:43] "GET /require HTTP/1.1" 200 16 0.0019
  127.0.0.1 - - [16/Jan/2011 20:49:46] "GET /require HTTP/1.1" 200 17 0.0005
  hi
  127.0.0.1 - - [16/Jan/2011 20:49:52] "GET /load HTTP/1.1" 200 13 0.0009
  hi
  127.0.0.1 - - [16/Jan/2011 20:49:54] "GET /load HTTP/1.1" 200 13 0.0008
  127.0.0.1 - - [16/Jan/2011 20:50:09] "GET /require HTTP/1.1" 200 17 0.0005
  127.0.0.1 - - [16/Jan/2011 20:50:12] "GET /require HTTP/1.1" 200 17 0.0005

hi的输出在日志中的请求输入之前; 你可以看到，请求“要求”只输出hi第一次，同时要求“负载”秀hi各一次。 这是服务器的输出，其中true表示文件中的代码实际运行， false表示不是：

smagic:~ phrogz$ curl http://localhost:4567/require
require sez true

smagic:~ phrogz$ curl http://localhost:4567/require
require sez false

smagic:~ phrogz$ curl http://localhost:4567/load
load sez true

smagic:~ phrogz$ curl http://localhost:4567/load
load sez true

smagic:~ phrogz$ curl http://localhost:4567/require
require sez false

smagic:~ phrogz$ curl http://localhost:4567/require
require sez false