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#coding=utf8
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'''
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客户端 udp协议 方法：
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1.通过多线程实现停等协议来进行可靠传输，
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2.通过压缩、分块实现文件的快速重传
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3.服务端接收后进行解压缩操作
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'''
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import socket
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import os
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import hashlib
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from os.path import basename
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from threading import Thread,Event
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from time import sleep
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import zipfile
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import gzip
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#-------------------------------配置--------------------------------------------
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#------------------------------config--------------------------------------------
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ip='192.168.230.141'#server的ip
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port=7777 #server的port
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BUFFER_SIZE= 4*1024*1024 #4G进行分块处理
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dst='file.txt' #目的文件夹
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port_ack=7778 #发送给server端ack消息的端口
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fn_path='output.bin'
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fn_path_zip=fn_path+".gz"
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ack_address=(ip,port_ack)
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#------------------------------大文件压缩-------------------------------------------
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BufSize = 1024*16
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def gZipFile(src, dst):
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fin = open(src, 'rb')
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fout = gzip.open(dst, 'wb')
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in2out(fin, fout)
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def gunZipFile(gzFile, dst):
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fin = gzip.open(gzFile, 'rb')
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fout = open(dst, 'wb')
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in2out(fin, fout)
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def in2out(fin, fout):
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while True:
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buf = fin.read(BufSize)
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if len(buf) < 1:
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break
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fout.write(buf)
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fin.close()
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fout.close() #关闭文件
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#------------------------------中间文件-------------------------------------------
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#用来临时保存数据
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data=set()
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#接收数据的socket
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sock_recv=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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sock_recv.bind(('',port))
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#确认反馈地址
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sock_ack=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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#重复收包次数
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repeat=0
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while True:
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buffer,_=sock_recv.recvfrom(BUFFER_SIZE)
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#全部接收完成，获取文件名
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if buffer.startswith(b'over_'):
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fn=buffer[5:].decode()
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#多确认几次文件传输结束，防止发送方丢包收不到确认
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for i in range(5):
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sock_ack.sendto(fn.encode()+b'_ack',ack_address)
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break
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buffer=tuple(buffer.split(b'_',maxsplit=1))
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if buffer in data:
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repeat=repeat+1
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else:
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data.add(buffer)
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sock_ack.sendto(buffer[0]+b'_ack',ack_address)
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sock_recv.close()
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sock_ack.close()
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data=sorted(data,key=lambda item:int(item[0]))
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with open(fn,'wb') as fp:
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for item in data:
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fp.write(item[1])
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#gunZipFile(fn_path_zip,dst)
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