import selectors
import socket
import os,time

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
'''
知识点:  
self.dic = {conn}、监听过程中 events 对象为活动列表。

总结:    
read()不应该写死时间，重新监听执行到read()时通过dic分割、状态保持，
以判断选择执行代码逻辑，

'''

class selectFtpServer:
    # sel = selectors.DefaultSelector()
    def __init__(self):
        self.ip_port=('127.0.0.1',8885)
        self.sel=selectors.DefaultSelector()#根据平台选择最佳的IO多路机制，比如linux就会选择epoll
        self.hasReceived=0
        self.dic = {}
        self.create_sock()
        self.handle()

    # 创建socket对象
    def create_sock(self):
        server = socket.socket()
        server.bind(('localhost', 1234))
        server.listen(100)
        server.setblocking(False)
        # 实例变量进行注册，sever与实例方法accept绑定
        self.sel.register(server, selectors.EVENT_READ, self.accept)
        print('server is running, waiting for connect')

    def handle(self):
        while True:
            events = self.sel.select()  # [server,conn1,conn2]活动列表
            for key, mask in events:
                callback = key.data  # 触发accept
                callback(key.fileobj, mask)  # accept(new_socket,mask)

    def accept(self,sock, mask):
        print('登录服务端---')
        conn, addr = sock.accept()  # Should be ready
        print('accepted', conn, 'from', addr)
        conn.setblocking(False)
        self.sel.register(conn, selectors.EVENT_READ, self.read)

        self.dic[conn]={}#conn赋值

    def read(self,conn, mask):

        try:
            if not self.dic[conn]:

                data = conn.recv(1024)
                try:
                    cmd, filename, filesize = str(data.decode("utf-8")).split("|")
                    self.dic[conn] = {"cmd": cmd, "filename": filename, "filesize": filesize, "hasReceived": 0}
                except Exception as e:

                    cmd, filename = str(data.decode("utf-8")).split("|")
                    self.dic[conn] = {"cmd": cmd, "filename": filename,"filesize": os.path.getsize(os.path.join(BASE_DIR, "load", filename)),"hasSended": 0}

                if cmd=='put':#上传
                    conn.send('ok'.encode('utf8'))

                if cmd=='get':#下载
                    conn.send(str(self.dic[conn]['filesize']).encode('utf8'))
            else:
                if self.dic[conn].get('cmd',None):
                    cmd =self.dic[conn].get('cmd')
                    if hasattr(self,cmd):
                        func=getattr(self,cmd)
                        func(conn,mask)#反射命令分发
                    else:
                        print('error')
        except Exception as e:
            print(e,conn,'断开连接')
            conn.close()
            self.sel.unregister(conn)

    def put(self,conn,mask):
        filename=self.dic[conn]['filename']
        filesize = self.dic[conn]['filesize']

        path = os.path.join(BASE_DIR, "upload", filename)

        data = conn.recv(1024)
        conn.send("success".encode("utf-8"))
        self.dic[conn]['hasReceived'] += len(data)
        with open(path, "ab") as f:
            f.write(data)
        if self.dic[conn]['hasReceived'] == self.dic[conn]['filesize']:
            self.dic[conn] = {}
            print("上传结束")

    def get(self, conn, mask):

        filename = self.dic[conn]['filename']
        path = os.path.join(BASE_DIR, "load", filename)

        with open(path, "rb") as f:
            f.seek(self.dic[conn]["hasSended"], 0)
            data = f.read(1024)
            conn.send(data)
            self.dic[conn]['hasSended'] += len(data)
            if self.dic[conn]['hasSended'] == self.dic[conn]["filesize"]:
                self.dic[conn] = {}
                print("下载结束")
        time.sleep(0.5)

if __name__ == "__main__":
    selectFtpServer()

import os, time, sys

BASE_DIR = os.path.dirname(os.path.abspath(__file__))

import socket

class selectFtpClient:
    def __init__(self):
        self.args = sys.argv  # 命令行参数
        if len(self.args)>1:
            self.port=(self.args[1],int(self.args[2]))
        else:
            self.ip_port=('127.0.0.1',8885)
        self.create_socket()
        self.command_fanout()

    def create_socket(self):
        try:
            self.sock = socket.socket()
            self.sock.connect(self.port)
            print("连接FTP成功!")
        except Exception:
            print("连接失败!")

    def command_fanout(self):
        while True:
            cmd = input(">>>").strip()
            if cmd == "exit()":
                break
            cmd, file = cmd.split()
            if hasattr(self, cmd):
                func = getattr(self, cmd)
                func(cmd, file)#put('put',path)
            else:
                print('调用错误！')

    # 上传
    def put(self, cmd, file):
        if os.path.isfile(file):#判断文件是否存在
            fileName = os.path.basename(file)#取名字
            fileSize = os.path.getsize(file)#取大小
            fileInfo = "%s|%s|%s" % (cmd, fileName, fileSize)#管道符打包
            self.sock.send(bytes(fileInfo, encoding="utf-8"))#引起server变化
            recvStatus = self.sock.recv(1024)
            hasSend = 0
            if str(recvStatus, encoding="utf-8") == 'ok':
                with open(file, "rb") as f:
                    while fileSize > hasSend:
                        contant = f.read(1024)
                        recv_size = len(contant)
                        self.sock.send(contant)
                        hasSend += recv_size
                        s = str(int(hasSend / fileSize * 100)) + "%"
                        print("正在上传文件：" + fileName + "   已经上传：  " + s)
                        time.sleep(0.5)
                print("%s文件上传完毕" % (fileName,))
            else:
                print("文件不存在")

    # 下载
    def get(self, cmd, file):

        fileInfo = "%s|%s" % (cmd, file)
        self.sock.send(bytes(fileInfo, encoding="utf-8"))
        filesize = int(self.sock.recv(10).decode("utf-8"))

        f = open(file, "ab")
        i = 0
        while i < filesize:
            self.sock.send("ok".encode("utf-8"))
            data = self.sock.recv(10)
            f.write(data)
            i += len(data)
            s = str(int(i / filesize * 100)) + "%"
            print("正在上传文件：" + file + "   已经下载：  " + s)

        print("下载完成")
        f.close()

if __name__ == "__main__":
    selectFtpClient()