import socket
import os
import sys
import struct
import threading

def socket_client():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect(('127.0.0.1', 9001))
    except socket.error as msg:
        print(msg)
        sys.exit(1)
    print(s.recv(1024))

    # 需要传输的文件路径
    filepath = input("请输入文件路径\n")
    # 判断是否为文件
    if os.path.isfile(filepath):
        # 定义定义文件信息。128s表示文件名为128bytes长，l表示一个int或log文件类型，在此为文件大小
        fileinfo_size = struct.calcsize('128sl')
        # 定义文件头信息，包含文件名和文件大小
        fhead = struct.pack('128sl', os.path.basename(filepath).encode('utf-8'), os.stat(filepath).st_size)
        # 发送文件名称与文件大小
        s.send(fhead)

        # 将传输文件以二进制的形式分多次上传至服务器
        fp = open(filepath, 'rb')
        while 1:
            data = fp.read(1024)
            if not data:
                print('{0} file send over...'.format(os.path.basename(filepath)))
                break
            s.send(data)
        # 关闭当期的套接字对象
        s.close()

def socket_service():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        # 绑定端口为9001
        s.bind(('127.0.0.1', 9001))
        # 设置监听数
        s.listen(10)
    except socket.error as msg:
        print(msg)
        sys.exit(1)
    print('Waiting connection...')

    while 1:
        # 等待请求并接受(程序会停留在这一旦收到连接请求即开启接受数据的线程)
        conn, addr = s.accept()
        # 接收数据
        t = threading.Thread(target=deal_data, args=(conn, addr))
        t.start()

def deal_data(conn, addr):
    print('Accept new connection from {0}'.format(addr))
    # conn.settimeout(500)
    # 收到请求后的回复
    conn.send('Hi, Welcome to the server!'.encode('utf-8'))
    global b
    while 1:
        # 申请相同大小的空间存放发送过来的文件名与文件大小信息
        fileinfo_size = struct.calcsize('128sl')
        # 接收文件名与文件大小信息
        buf = conn.recv(fileinfo_size)
        # 判断是否接收到文件头信息
        if buf:
            # 获取文件名和文件大小
            filename, filesize = struct.unpack('128sl', buf)
            fn = filename.strip(b'\00')
            fn = fn.decode()
            print('file new name is {0}, filesize if {1}'.format(str(fn), filesize))
            b = str(fn)
            recvd_size = 0  # 定义已接收文件的大小
            # 存储在该脚本所在目录下面
            fp = open('./' + str(fn), 'wb')
            print('start receiving...')

            # 将分批次传输的二进制流依次写入到文件
            while not recvd_size == filesize:
                if filesize - recvd_size > 1024:
                    data = conn.recv(1024)
                    recvd_size += len(data)
                else:
                    data = conn.recv(filesize - recvd_size)
                    recvd_size = filesize
                fp.write(data)
            fp.close()
            print('end receive...')
        # 传输结束断开连接
        conn.close()
        read(b)
        break

def read(path):
    path = path.strip()
    path = path.rstrip("\\")
    isExists = os.path.exists(path)
    if not isExists:
        print("没有这个文件")
    else:
        file = open(path, 'r')
        print(file.read())
        file.close()
        print("文件已关闭")

if __name__ == '__main__':
    a = int(input("请选择模式(1 for 发送文件)/(2 for 接受文件)\n"))
    if(a==1):
        socket_client()
    else:
        socket_service()