python在线编译器的简单原理及简单实现代码

我们先来看一下效果（简单的写了一个）:

原理:将post请求的代码数据写入了服务器的一个文件，然后用服务器的python编译器执行返回结果

实现代码：

＃flaskrun.py
# -*- coding: utf-8 -*-
# __author__="ZJL"
from flask import Flask
from flask import request
from flask import Response
import json
import zxby
app = Flask(__name__) 

def Response_headers(content):
  resp = Response(content)
  resp.headers['Access-Control-Allow-Origin'] = '*'
  return resp 

@app.route('/')
def hello_world():
  return Response_headers('hello world!!!') 

@app.route('/run', methods=['POST'])
def run():
  if request.method == 'POST' and request.form['code']:
    code = request.form['code']
    print(code)
    jsondata = zxby.main(code)
    return Response_headers(str(jsondata)) 

@app.errorhandler(403)
def page_not_found(error):
  content = json.dumps({"error_code": "403"})
  resp = Response_headers(content)
  return resp 

@app.errorhandler(404)
def page_not_found(error):
  content = json.dumps({"error_code": "404"})
  resp = Response_headers(content)
  return resp 

@app.errorhandler(400)
def page_not_found(error):
  content = json.dumps({"error_code": "400"})
  resp = Response_headers(content)
  return resp 

@app.errorhandler(405)
def page_not_found(error):
  content = json.dumps({"error_code": "405"})
  resp = Response_headers(content)
  return resp 

@app.errorhandler(410)
def page_not_found(error):
  content = json.dumps({"error_code": "410"})
  resp = Response_headers(content)
  return resp 

@app.errorhandler(500)
def page_not_found(error):
  content = json.dumps({"error_code": "500"})
  resp = Response_headers(content)
  return resp 

if __name__ == '__main__':
  app.run(debug=True) 

#zxby.py
# -*- coding: utf-8 -*-
# __author__="ZJL"
import os, sys, subprocess, tempfile, time
# 创建临时文件夹,返回临时文件夹路径
TempFile = tempfile.mkdtemp(suffix='_test', prefix='python_')
# 文件名
FileNum = int(time.time() * 1000)
# python编译器位置
EXEC = sys.executable 

# 获取python版本
def get_version():
  v = sys.version_info
  version = "python %s.%s" % (v.major, v.minor)
  return version 

# 获得py文件名
def get_pyname():
  global FileNum
  return 'test_%d' % FileNum 

# 接收代码写入文件
def write_file(pyname, code):
  fpath = os.path.join(TempFile, '%s.py' % pyname)
  with open(fpath, 'w', encoding='utf-8') as f:
    f.write(code)
  print('file path: %s' % fpath)
  return fpath 

# 编码
def decode(s):
  try:
    return s.decode('utf-8')
  except UnicodeDecodeError:
    return s.decode('gbk') 

  # 主执行函数  

def main(code):
  r = dict()
  r["version"] = get_version()
  pyname = get_pyname()
  fpath = write_file(pyname, code)
  try:
    # subprocess.check_output 是 父进程等待子进程完成，返回子进程向标准输出的输出结果
    # stderr是标准输出的类型
    outdata = decode(subprocess.check_output([EXEC, fpath], stderr=subprocess.STDOUT, timeout=5))
  except subprocess.CalledProcessError as e:
    # e.output是错误信息标准输出
    # 错误返回的数据
    r["code"] = 'Error'
    r["output"] = decode(e.output)
    return r
  else:
    # 成功返回的数据
    r['output'] = outdata
    r["code"] = "Success"
    return r
  finally:
    # 删除文件(其实不用删除临时文件会自动删除)
    try:
      os.remove(fpath)
    except Exception as e:
      exit(1) 

if __name__ == '__main__':
  code = "print(11);print(22)"
  print(main(code)) 

运行app.run()方法，通过post提交代码，就ok了。我们可以对输出结过做进一步的处理，我这只是为了解一下原理，就没继续了。

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