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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