python socketserver 实现 ftp功能

需求：

1. 用户加密认证
2. 允许同时多用户登录
3. 每个用户有自己的家目录 ，且只能访问自己的家目录
4. 对用户进行磁盘配额，每个用户的可用空间不同
5. 允许用户在ftp server上随意切换目录
6. 允许用户查看当前目录下文件
7. 允许上传和下载文件，保证文件一致性
8. 文件传输过程中显示进度条
9. 附加功能：支持文件的断点续传

client:

#coding:utf-8
import socket
import json
import os
#client.connect(('192.168.16.200',9999))

class FtpClient(object):
    def __init__(self):
        self.client = socket.socket()
    def help(self):
        msg = '''
        ls
        pwd
        cd ../..
        get filename
        put filename
        '''
        print(msg)
    def connect(self,ip,port):
        self.client.connect((ip, port))
    def interactive(self):
        #self.authenticate()
        while True:
            cmd = input(">>").strip()
            if len(cmd) ==0:continue
            cmd_str = cmd.split()[0]
            if hasattr(self,"cmd_%s" % cmd_str):
                func = getattr(self,"cmd_%s" % cmd_str)
                func(cmd)
            else:
                self.help()
    def cmd_put(self,*args):
        cmd_split =  args[0].split()
        if len(cmd_split) >1:
            filename = cmd_split[1]
            if os.path.isfile(filename):
                filesize = os.stat(filename).st_size
                msg_dic = {
                    "action": "put",
                    "filename":filename,
                    "size": filesize,
                    "overridden":True
                }
                self.client.send( json.dumps(msg_dic).encode("utf-8")  )
                print("send",json.dumps(msg_dic).encode("utf-8") )
                #防止粘包，等服务器确认
                server_response = self.client.recv(1024)
                f = open(filename,"rb")
                for line in f:
                    self.client.send(line)
                else:
                    print("file upload success...")
                    f.close()

            else:
                print(filename,"is not exist")
    def cmd_get(self):
        pass

ftp = FtpClient()
ftp.connect("localhost",9999)
ftp.interactive()

server:

import socketserver
import json,os
class MyTCPHandler(socketserver.BaseRequestHandler):

    def put(self,*args):
        '''接收客户端文件'''
        cmd_dic = args[0]
        filename = cmd_dic["filename"]
        filesize = cmd_dic["size"]
        if os.path.isfile(filename):
            f = open(filename + ".new","wb")
        else:
            f = open(filename , "wb")

        self.request.send(b"200 ok")
        received_size = 0
        while received_size < filesize:
            data = self.request.recv(1024)
            f.write(data)
            received_size += len(data)
        else:
            print("file [%s] has uploaded..." % filename)

    def handle(self):
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                cmd_dic = json.loads(self.data.decode())
                action = cmd_dic["action"]
                if hasattr(self,action):
                    func = getattr(self,action)
                    func(cmd_dic)

            except ConnectionResetError as e:
                print("err",e)
                break
if __name__ == "__main__":
    HOST, PORT = "localhost", 9999
    # Create the server, binding to localhost on port 9999
    server = socketserver.ThreadingTCPServer((HOST, PORT), MyTCPHandler)
    server.serve_forever()