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在线编程和代码分享

你好,我是悦创。因为项目,需要在网页中嵌入编译器。这个分为两部分,前端单独编译器及后端 flask 服务,前端编译器部分可参考:https://www.aiyc.top/1490.html ,里面有源码,后端部分参考一下:

看到菜鸟教程的 Python 编译器发现挺有意思,想搞明白它的原理是啥,于是我输入了以下代码:

import sys,os
print(sys.version_info)
print(sys.executable)
print(sys.path[0])
print(os.listdir(sys.path[0]))
with open("/usercode/file.py") as e:
	print(e.read())

我个人推测,它是将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:

于是我自己简单实现一个

目录结构:

OnlineEXEC
|----zxby.py
|----app
    |----flaskrun.py

zxby.py 代码实现:

# -*- coding: utf-8 -*-
#__author__="AI悦创"
 
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("你好")"""
#     print(main(code))

flaskrun.py 代码实现:

# -*- 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)

打开 postman 测试:

正确代码测试:

在这里插入图片描述

错误代码测试:

在这里插入图片描述

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